Research Collaboration

The department engages research collaboration with National and international Universities and research institutes in various fields of chemical and allied Sciences like University of Bologna, Italy; University of Milan, Italy; University of Milano-Bicocca, Milan, Italy; Colarado State University, USA; Council of National Research, Milan; NCL, Pune;  IIT, Hyderabad, Chennai, Gandhinagar, IIST, NIIST, IISER Thiruvananthapuram, IGCAR, Kalpakkam, etc.

RESEARCH FACILITIES

Amrita Vishwa Vidyapeetham has provided all infrastructure which in turn provide a conducive physical ambience for research in terms of adequate research laboratories, computing facilities and allied services. The department also possesses classical chemistry labs which have been structured with a vision of transforming it into an excellent centre for research in the frontier areas of applied chemistry and allied branches. The research lab is well equipped with various sophisticated equipments which help in carrying out research in the various frontier as well as emerging areas in chemistry.

STUDENT INTERNSHIPS

We send our students for short term internships and final projects to premier research institutes and Universities in India and abroad like IITs at Mumbai, Chennai, Guhawti, CSIR Labs, CLRI, NCL, SIKRI, JNCASR, Tokyo Metropolitan University, Monash University. Many of our students and alumini got admission to pursue their higher studies in prestigious institutions like IIT, NIT.

HIGHER STUDIES & RESEARCH OPPORTUNITIES

Special training are given to the students to write GATE, NET and IAS exams for their higher studies. Students are encouraged to take up the Integrated PhD / PhD programmes in India and abroad.

Publications

Publication Type: Journal Article

Year of Publication Publication Type Title

2018

Journal Article

P. K. Sandhya, Jiya Jose, M.S. Sreekala, Prof. M. Padmanabhan, Nandakumar Kalarikkal, and Sabu Thomas, “Reduced graphene oxide and ZnO decorated graphene for biomedical applications”, Ceramics International, vol. 44, pp. 15092-98, 2018.[Abstract]

The ability of graphene-based materials to enhance the conventional antibiotic resistance is well known and researchers have been interested in improving their antibacterial activity. The reduction of graphene oxide by eco-friendly reducing agents is of great interest on the basis of environmental and human health aspects. Herein we report the synthesis of two forms of graphene derivatives namely, reduced graphene oxide (RGO) through reduction using potato starch and zinc oxide decorated RGO (ZnO-RGO). In the case of ZnO-RGO, the reduction of graphene oxide and the conversion of ZnO to nano ZnO occur simultaneously. The characterization of all the graphene based materials and nanocomposites developed were carried out using FT-IR, XRD, Raman spectra and TEM techniques. The antibacterial activity of these modified materials against E. coli was also studied by well diffusion method. Our results show that ZnO-RGO is more efficient than RGO in their antibacterial properties which we attribute to the synergistic effect of ZnO and RGO towards the bacteria in the nanocomposite. Further we find that the antibacterial effect of ZnO-RGO towards E. coli is due to the disruption of the bacterial cell which could be confirmed by AFM images. Considering the fact that graphene-based materials are less toxic towards mammalian cells, both RGO and ZnO-RGO we have developed can find applications in the field of medicine and life sciences.

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2018

Journal Article

Dr. Sreedhar K. M., U. Sachin Varma, P. Gautham, D.V. Ravi Kumar, Dr. Sreekanth K. M., and G. Sivasubramanian, “Co-precipitation as a tool for effective doping of magnesium in zinc oxide: Studies on structural, optical and photocatalytic properties”, RASAYAN Journal of Chemistry, vol. 11, pp. 1491 - 1500, 2018.[Abstract]

Elimination of toxic compounds from our essential commodities such as water, air, foods etc. and provision for safe and clean basic needs is currently one of the most significant international topics for research, especially in food, water and air pollution control. Metal oxides have emerged as one of the most interesting materials in the current period owing to their potential catalytic properties. The II-VI metal oxides are gaining considerable attention in optoelectronics and in rectifying environmental issues due to their ability to produce charge carriers when accelerated with a sufficient amount of energy. The electronic structure, fluorescence and phosphorescence properties and charge transport abilities of the metal oxides have made them photo catalysts. In this paper, we report a precise investigation of structural, optical and photo catalytic properties of industrially and technologically important ZnO and MgxZn(1-x)O nanoparticles. The materials were synthesized via chemical methods using solutions of zinc sulphate, sodium hydroxide, silver nitrate and magnesium sulphate. The structural, optical and photocatalytic properties of the synthesized samples were studied using X-ray diffractometer and UV-VIS spectrophotometer. The average crystallite size of the prepared samples is between 15 to 20 nm. The optical band value of the ZnO nanoparticles was found 3.3 eV. The photocatalytic studies were conducted using an in-house built assembly and photocatalytic degradation of Cr was chosen as a reference. The synthesized MgxZn(1-x)O has been observed as an excellent photocatalyst, and shown promising results for the degradation of Cr(VI).

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2018

Journal Article

V. Anjana, Sara John, Pooja Prakash, Amritha M Nair, Aravind R Nair, Sreedha Sambhudevan, and B. Shankar, “Magnetic Properties of Copper Doped Nickel Ferrite Nanoparticles Synthesized by Co Precipitation Method”, IOP Conference Series: Materials Science and Engineering, vol. 310, p. 012024, 2018.[Abstract]

Nickel ferrite nanoparticles with copper atoms as dopant have been prepared using co-precipitation method with general formula Ni 1-x Cu x Fe 2 O 4 (x=0.2, 0.4, 0.6, 0.8 and 1) and are sintered at quite ambient temperature. Structural and magnetic properties were examined using Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction method (XRD) and Vibrating Sample Magnetometer (VSM) to study the influence of copper doping in nickel ferrite magnetic nanoparticles. X-ray studies proves that the particles are possessing single phase spinel structure with an average particle size calculated using Debye Scherer formula. Magnetic measurements reveal that saturation magnetization value (M s ) decreases while magnetic coercivity (H c ) increases upon doping.

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2018

Journal Article

Sankar S. Menon, Radhu Krishna, Lida Wilson, Sreedha Sambhudevan, B. Shankar, Anshida Mayeen, and Nandakumar Kalarikkal, “Magnetic and dielectric properties of nickel-ferrite-embedded natural rubber composites”, Polymer Bulletin, vol. 75, pp. 5217–5234, 2018.[Abstract]

Spinel-structured nickel ferrite has been prepared using co-precipitation method. The ferrite particles prepared were characterized using XRD, FTIR, and TEM and were confirmed to be in the nano-regime. Natural rubber composites were prepared with different loadings of nickel ferrite like 5, 15, 25, 50, and 75 (in part per hundred rubber, phr). The mechanical, swelling, and magnetic properties were analyzed using the standard methods. Dielectric measurements show that permittivity decreases with increase in frequency and increases with increase in ferrite loading. Tan delta value also was found to increase with filler loading which may be attributed to the presence of interfacial polarization.

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2018

Journal Article

Athira Krishnan and S.M.A. Shibli, “Optimization of an efficient, economic and eco-friendly inhibitor based on Sesbania grandiflora leaf extract for the mild steel corrosion in aggressive HCl environment”, Anti-Corrosion Methods and Materials, vol. 65, no. 2, pp. 210–216, 2018.[Abstract]

Purpose
This paper aims to evaluate the inhibitive action of different concentrations of Sesbania grandiflora leaf extract on the mild steel corrosion in an aggressive HCl medium under different experimental conditions.
Design/methodology/approach
Weight loss investigation, open-circuit voltage analysis, Tafel polarisation, AC impedance analysis, etc. were used for the evaluation of inhibition efficiency. The influence of immersion period on inhibition efficiency was evaluated. The mechanism of action of the inhibitor is also discussed. Infrared (IR) spectroscopy and energy-dispersive X-ray spectroscopy analysis were used to characterise the passive film.
Findings
The results suggested that 10,000 ppm solution has maximum inhibition efficiency of 98.01 per cent at room temperature, while 1,000 ppm solution also exhibited a better efficiency of about 96.16 per cent. Efficiency of inhibitor solution was found to increase with an increase in its concentration. Polarisation study proposed the solution as an anodic inhibitor. Impedance study confirmed the formation of a protective layer over the surface of the specimen, and the constituents of the film were identified using IR spectroscopy. Stability of the film adsorbed on the steel was cleared from the steady open-circuit potential value. Study on action of the inhibitor under accelerated conditions revealed the fact that the efficiency of extract in preventing corrosion is good under stimulated conditions also.
Practical implications
The action of inhibitor sustains for a sufficient time period and could sustain under stimulated conditions. Hence, its application is practically possible in industries. The proposed inhibitor is widely available and is environmentally safe.
Originality/value
HCl is an industrially important chemical used for acid cleaning, acid pickling, etc. HCl was used as an aggressive corrosion environment. As the chances for mild steel to be in contact with HCl were very high, it was important to develop an efficient, economical and eco-friendly inhibitor for corrosion.

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2018

Journal Article

Nayana Krishna, G Nanda Kumar, TS. Neethu, Rini John, S.R. Babu, and Dr. Smitha Chandran S., “One Pot Green Synthesis of Silver Nanoparticles with Multiple Applications”, Materials Today: Proceedings, vol. 5, pp. 20567 - 20571, 2018.[Abstract]

Cost effective chemosensors were developed from green synthesized silver nanoparticles using Leucas indica and were characterized with surface Plasmon Resonance (SPR) UV Spectrometry. The sensitivity and selectivity of green synthesized silver nanoparticles towards transition metal ions and alkaline earth metals were studied. Applications such as antimicrobial activity and the ability of formed stable nanoparticle to act as chemosensors are also studied. UV studies confirmed the presence of silver nanoparticles by their characteristic peak in range of 436-446nm. Ag NPs also showed antimicrobial activities with gram negative (Escherichia coli) microorganisms.

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2017

Journal Article

G. George, Joseph, K., Dr. Saritha A., and Nagarajan, E. R., “Influence of fiber content and chemical modifications on the transport properties of PP/jute commingled biocomposites”, Polymer Composites, 2017.[Abstract]

This article aims at the investigation of the effect of five different parameters on the transport behavior of PP/jute yarn commingled eco-composites. The high affinity of jute yarns to moisture (hydrophilic nature) favored the water absorption whereas xylene and toluene diffusion through PP/jute commingled system reduced with increasing fiber content. Chemical treatments increased the interfacial adhesion between the matrix and jute yarns resulting in lesser number of voids and other irregularities at the interface and also resulted in a reduction in the hydrophilic tendency of jute yarns. This led to a decrease in apparent weight gain % with different treatments. The activation energy for the solvent xylene increased with the increase in fiber content owing to the hindering of motion of the solvent molecules by the reinforcing jute yarns whereas for the solvent water, the activation energy decreases with increase in fiber content due to the hydrophilic nature of jute yarns. The analysis of mechanism of transport revealed that the diffusion of water through the composites very nearly follow Fickian mode of transport whereas for the solvent xylene it deviates from it. © 2017 Society of Plastics Engineers.

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2017

Journal Article

S. Thamban, Arjun U, Prof. M. Padmanabhan, and Nath, R. Chandra, “Structural and magnetic properties of spin-$1/2$ dimer compound Cu$_2$(IPA)$_2$(DMF)(H$_2$O) with a large spin gap.”, Journal of Physics: Condensed Matter : an Institute of Physics journal, 2017.[Abstract]

We present the synthesis and a detailed investigation of structural and magnetic properties of metal-organic compound Cu$_2$(IPA)$_2$(DMF)(H$_2$O) by means of x-ray diffraction, magnetization, and heat capacity measurements. Single crystals of the title compound were synthesized by judicious selection of organic ligand and employing a selective hydrothermal reaction route. It crystallizes in an orthorhombic structure with space group $Cmca$. The structural analysis revealed that two Cu$^{2+}$ ions are held together by the organic component (-O-C-O-) in a square paddle-wheel to form spin dimers which are aligned perpendicular to each other and are further coupled through organic ligands (isophthalic acid) forming two-dimensional layers. Temperature dependent magnetic susceptibility $\chi(T)$ could be described well using spin-$1/2$ dimer model. The spin susceptibility $\chi_{\rm spin} (T)$ shows an exponential decrease in the low temperature region, below the broad maximum, confirming the singlet ground state with a large spin gap of $\Delta/k_{\rm B} \simeq 409$~K. The heat capacity $C_{\rm p}$ measured as a function of temperature also confirms the absence of magnetic long-range-order down to 2~K. More »»

2017

Journal Article

S. Thamban, U. Arjun, Prof. M. Padmanabhan, and R. C. Nath, “Structural and magnetic properties of spin-1/2 dimer compound Cu2(IPA)2(DMF)(H2O) with a large spin gap”, Journal of Physics: Condensed Matter: an Institute of Physics journal, vol. 29, 2017.[Abstract]

We present the synthesis and a detailed investigation of structural and magnetic properties of metal-organic compound Cu2(IPA)2(DMF)(H2O) by means of x-ray diffraction, magnetization, and heat capacity measurements. Single crystals of the title compound were synthesized by judicious selection of organic ligand and employing a selective hydrothermal reaction route. It crystallizes in an orthorhombic structure with space group Cmca. The structural analysis revealed that two Cu2+ ions are held together by the organic component (-O-C-O-) in a square paddle-wheel to form spin dimers which are aligned perpendicular to each other and are further coupled through organic ligands (isophthalic acid) forming two-dimensional layers. Temperature dependent magnetic susceptibility χ(T)could be described well using spin-1/2 dimer model. The spin susceptibility χspin(T)shows an exponential decrease in the low temperature region, below the broad maximum, confirming the singlet ground state with a large spin gap of Δ/kB ≃ 414 K. The heat capacity Cp measured as a function of temperature also confirms the absence of magnetic long-range-order down to 2 K. © 2017 IOP Publishing Ltd.

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2017

Journal Article

R. Rejithamol, Aparna, K., Swetha, S., Gayathri, A., and Jisha, S., “A facile synthesis of α-hydrazino ketones from 1,3-dicarbonyl compounds using 1,8-diazobicyclo[5.4.0]undec-7-ene (DBU) as organic catalyst”, Asian Journal of Chemistry, vol. 29, pp. 1963-1965, 2017.[Abstract]

A convenient and rapid method for the synthesis of α-hydrazino ketones from 1,3-dicarbonyl compounds and diethyl azodicarboxylate in presence of 1,8-diazobicyclo[5.4.0]undec-7-ene as an organic catalyst at room temperature giving good yields, short reaction time and easy isolation. © 2017, Chemical Publishing Co. All rights reserved.

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2016

Journal Article

S. Sankar, B.N. Nair, T. Suzuki, G.M. Anilkumar, Prof. M. Padmanabhan, U.N.S. Hareesh, and K.G.K. Warrier, “Hydrophobic and metallophobic surfaces: Highly stable non-wetting inorganic surfaces based on lanthanum phosphate nanorods”, Scientific Reports (Nature Publishing Group), vol. 6, 2016.[Abstract]

Metal oxides, in general, are known to exhibit significant wettability towards water molecules because of the high feasibility of synergetic hydrogen-bonding interactions possible at the solid-water interface. Here we show that the nano sized phosphates of rare earth materials (Rare Earth Phosphates, REPs), LaPO 4 in particular, exhibit without any chemical modification, unique combination of intrinsic properties including remarkable hydrophobicity that could be retained even after exposure to extreme temperatures and harsh hydrothermal conditions. Transparent nanocoatings of LaPO 4 as well as mixture of other REPs on glass surfaces are shown to display notable hydrophobicity with water contact angle (WCA) value of 120° while sintered and polished monoliths manifested WCA greater than 105°. Significantly, these materials in the form of coatings and monoliths also exhibit complete non-wettability and inertness towards molten metals like Ag, Zn, and Al well above their melting points. These properties, coupled with their excellent chemical and thermal stability, ease of processing, machinability and their versatile photo-physical and emission properties, render LaPO 4 and other REP ceramics utility in diverse applications.

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2016

Journal Article

Ua Arjun, Brinda, Ka, Padmanabhan, Mb, and Nath, Ra, “Magnetic properties of layered rare-earth oxy-carbonates Ln2O2CO3 (Ln=Nd, Sm, and Dy)”, Solid State Communications, 2016.[Abstract]

Polycrystalline samples of rare-earth oxy-carbonates Ln 2O2CO3 (Ln=Nd, Sm, and Dy) are synthesized and their structural and magnetic properties are investigated. All of them crystallize in a hexagonal structure with space group P63/mmc. They form a double layered structure with frustrated triangular arrangement of rare-earth magnetic ions. An antiferromagnetic transition is observed at TN 1.25K,0.61K, and 1.21K for Nd2O2CO3, Sm2O2CO3, and Dy2O2CO3, respectively. From the analysis of magnetic susceptibility, the value of the Curie-Weiss temperature θCW is obtained to be  21.7K, 18K, and 10.6K for Nd2O2CO3, Sm2O2CO3, and Dy2O2CO3, respectively. The magnetic frustration parameter f(=|θCW|/TN) is calculated to be  17.4, 31, and 8.8 for Nd2O2CO3, Sm2O2CO3, and Dy2O2CO3, respectively, which indicates that Sm2O2CO3 is strongly frustrated compared to its Nd and Dy analogues. © 2016 Elsevier Ltd. More »»

2016

Journal Article

B. Costa, Dr. Milind Shrinivas, Vetro, M., Donvito, G., Gabrielli, L., Amigoni, L., Cassinelli, G., Lanzi, C., Ceriani, M., De Gioia, L., Filippi, G., Cipolla, L., Zaffaroni, N., Perego, P., and Colombo, D., “Synthetic sulfoglycolipids targeting the serine–threonine protein kinase Akt”, Bioorganic and Medicinal Chemistry, vol. 24, pp. 3396-3405, 2016.[Abstract]

The serine–threonine protein kinase Akt, also known as protein kinase B, is a key component of the phosphoinositide 3-kinase (PI3K)–Akt–mTOR axis. Deregulated activation of this pathway is frequent in human tumors and Akt-dependent signaling appears to be critical in cell survival. PI3K activation generates 3-phosphorylated phosphatidylinositols that bind Akt pleckstrin homology (PH) domain. The blockage of Akt PH domain/phosphoinositides interaction represents a promising approach to interfere with the oncogenic potential of over-activated Akt. In the present study, phosphatidyl inositol mimics based on a β-glucoside scaffold have been synthesized as Akt inhibitors. The compounds possessed one or two lipophilic moieties of different length at the anomeric position of glucose, and an acidic or basic group at C-6. Docking studies, ELISA Akt inhibition assays, and cellular assays on different cell models highlighted 1-O-octadecanoyl-2-O-β-D-sulfoquinovopyranosyl-sn-glycerol as the best Akt inhibitor among the synthesized compounds, which could be considered as a lead for further optimization in the design of Akt inhibitors. © 2016 Elsevier Ltd

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2016

Journal Article

Sreedha Sambhudevan, Shankar, B., Dr. Saritha A., and Joseph, K., “Evaluation of Kinetics and Transport Mechanism of Solvents Through Natural Rubber Composites Containing Organically Modified Gadolinium Oxide”, Plastics, Rubber and Composites-Macromolecular Engineering, vol. 45, pp. 216 - 223, 2016.

2016

Journal Article

Dr. Beena S. and Kumar, K. Girish, “PVC Membrane Sensor for Nd (III) Based on N 1 , N 2 -Bis (Salicylidine) Butane-1, 4 -Diamine”, International Journal of Advanced Research in Chemical Science (IJARCS), vol. volume 3, no. Issue 2, 2016.[Abstract]

N 1 , N2 -bis(salicylidine)butane-1,4-diamine (SAB ) based PVC membrane sensor was fabricated for Nd(III). The developed sensor showed nernstian response in the concentration range of 1.0×10-6 to 1.0×10-1 M. Nernstian slope of the proposed sensor was found to be 20.6±0.3 mV/decade in the pH range 3.0 to 7.5. The developed sensor displays a response time of <15 s. The proposed sensor can be used over a period of 7 weeks without any significant changes in its Nerstian behaviour. The sensor showed good selectivity for neodymium when compared with other metal ions such as Na+ , K+ , Mg2+, Ca2+, Pb2+, Ag+ , Pr3+ , Sm3+, La3+, and Gd3+. This electrode was used as an indicator electrode in the potentiometric titration of neodymium ions with EDTA and was also applied in the determination of neodymium in binary mixture. More »»

2016

Journal Article

Dr. Smitha Chandran S., Ash, P., and Bist, A., “Managing Former Landfill Sites a Case Study of Ecorestoration from Kochi, Kerala”, Green Chemistry & Technology Letters, vol. 1, pp. 82–85, 2016.[Abstract]

This paper describes the dramatic success in the eco-restoration of a heavy-metal contaminated open garbage dump at the Amrita Institute of Medical Sciences (AIMS), a 1450-bed super-specialty hospital located in Kochi, Kerala, India. Today, the hospital caters to over 10 lakh patients annually. Inspired by our Chancellor’s vision of zero-waste, the hospital undertook its journey with a view to also reducing massive greenhouse gas emissions that result from improper handling of waste. Today, the hospital manages its municipal solid waste on an industrial scale, composting some eight metric tonnes of organic waste daily.This case study outlines the path followed to achieve zero-waste. Alongside, the rehabilitation of a former dump site is described in detail at this very site are carried out all composting operations of AIMS. Within three years of the restoration activities, heavy metal concentrations in the contaminated soil reduced drastically.There was relatively low uptake of the heavy metals by the plants; however, they might have been crucially responsible for providing a favorable environment for soil restoring microorganisms in their rhizosphere. Observable habitat-restoration continues at the site, including the return of birds and insects and other wildlife, making this an ideal site for further research and demonstration for community awareness and education. More »»

2015

Journal Article

J. K. Molloy, Dr. Zeena S. Pillai, Sakamoto, J., Ceroni, P., and Bergamini, G., “Lanthanide Terpyridine-Based Assemblies: Towards Dual Luminescent Probes”, Asian Journal of Organic Chemistry, vol. 4, pp. 251–255, 2015.

2015

Journal Article

Sreedha Sambhudevan, “Synthesis and characterization of organically modified gd2o3 - natural rubber composites as effective x-ray shielding materials”, Green Chemistry & Technology Letters, vol. 1, pp. 86–91 , 2015.[Abstract]

Protective materials based on lead are the usual X- ray shielding materials but their extended use leads to severe health problems due to the toxic nature of lead. Moreover, lead based materials are not appropriate for absorbing the regular energy region of X-ray used in medical field and hence natural rubber composites containing modified Gadolinium oxide (Gd2O3) as filler is suggested as an alternative. Natural rubber composites were prepared with organically modified Gd2O3 at various filler loadings.The structural features of modified Gd2O3 were examined using FTIR, X-ray diffraction and SEM. The particle size of organically modified Gd2O3 was found to be in the nano range which contributes to the enhanced properties of the composites. The increase of filler loading improved the shielding effectiveness of the rubber composites. Examination of mechanical and X-ray shielding properties show the effectiveness of the material to be used as potential shielding materials. More »»

2015

Journal Article

A. Krishna, Nair, S. T., Dr. Smitha Chandran S., and Dr. Saritha A., “From biowastes to novel nanomaterials: A one pot green synthesis of nanoparticles towards the naked eye detection of metals ”, International Journal of Applied Engineering Research, vol. 10, 2015.[Abstract]

Green nanotechnology has gained momentum in the recent years because it couples the immense applications of nanotechnology with the principles of green chemistry so that the toxic effects of nanotechnology stands nullified. The environmental as well as health issues of nanotechnology has only been addressed in the recent times and since then the green pathway towards the synthesis of nanoparticles has gained immense attention. The novel phenomenon of surface Plasmon resonance exhibited by metallic nanoparticles has been exploited and silver nanoparticles were prepared from biowastes like cashew peel, tapioca peel, banana bosom peel etc which would otherwise appear as waste in and around the processing centers. The aforementioned nanoparticles were characterized by UV spectroscopy and the behavior of these particles towards naked eye detection of selected heavy metal ions like nickel, cadmium,lead and mercury were observed. More »»

2015

Journal Article

Dr. Smitha Chandran S. and E. V. Ramasamy, “Utilization of Limnocharis flava, an invasive aquatic weed from Kuttanad wetland ecosystem, kerala, india as a potential feedstock for livestock”, Online Journal of Animal and Feed Research , vol. 5, no. 1, pp. 22-27, 2015.[Abstract]

The chemical composition, nutritive value and trace element profiles of Limnocharis flava, an emergent aquatic weed during its different growth stages was determined to evaluate as possible cattle feed. Samples were analyzed at three progressive morphological stages of the plant, pre-flowering, flowering and post-flowering. The moisture content, dry matter (DM), ash content, crude protein (CP), ether extract (EE), crude fiber (CF), nitrogen free extract (NFE) and mineral constituents like sodium (Na+) potassium (K+), calcium (Ca2+), phosphorous (P) and trace elements like iron (Fe2+), copper (Cu2+), manganese (Mn2+), zinc (Zn2+), lead (Pb2+), chromium (Cr2+ ) nickel (Ni+) and cadmium (Cd+) contents were analyzed. The moisture content, organic matter (OM), acid detergent fiber content increased during maturation, while CP and EE were found decreased with increased growth stage. Only slight fluctuations occurred in Calcium, Potassium, Phosphorous and Sodium contents. The highest values for crude protein, fiber content, NFE and EE were observed at the flowering stage. These plant posses several characteristics which makes it a nutritious feed suitable for domestic livestock, and is recommended to use L.flava, particularly at the flowering stage of growth. More »»

2015

Journal Article

Ananthika V, Sreedha Sambhudevan, and Sanker, B., “Mechanical, Swelling and Magnetic property studies of Natural rubber-Nickel ferrite composites”, International Journal of Applied Engineering Research, vol. 10, 2015.[Abstract]

Polymers are usually non-magnetic in nature. The introduction of magnetic materials imparts magnetic properties to the polymer as well as improves the physical properties of polymer/rubber matrix. The merits of polymer bonded magnets (PBMs) over their metallic and ceramic counterparts comprise low weight, resistance to corrosion, ease of fabrication and capability for high production rates. In the present work nickel ferrite was prepared by coprecipitation method. The prepared ferrite fillers are embedded in natural rubber (NR) matrix by mechanical mixing at different loadings to get the rubber ferrite composites (RFCs) and their properties were studied as a function of filler loading from 0-75 phr. The mechanical property study reveals that tensile strength, elongation at break and modulus (100%) increases up to 25 phr of filler loading and afterwards it shows a marginal fall, but Shore hardness significantly increases with filler loading. The magnetic measurements were done on the filler and prepared RFCs. The results show that there is a significant improvement in the coercivity, magnetic retentivity and saturation magnetization and is linearly dependent on the filler amount. The solvent diffusion study shows that the equilibrium solvent uptake decreases with increase in filler content which is in accordance with mechanical and magnetic studies. More »»

2014

Journal Article

Aab Saritha and Joseph, Kb, “Role of solvent interaction parameters in tailoring the properties of chlorobutyl rubber nanocomposites”, Polymer Composites, 2014.[Abstract]

Chlorobutyl rubber, a special class of butyl rubber, which exhibits superior air impermeability, is the elastomer of choice for the inner tubes and liners of tires. Chlorobutyl rubber nanocomposites containing layered silicates were prepared using solvents with varying cohesive energy density and the effect of solvent-clay and solvent-rubber parameters in determining the properties of the nanocomposites were studied. The nanocomposites so prepared were characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The results were interpreted with the help of thermodynamic concepts and a correlation between the mechanical properties of the nanocomposites and the difference in the interaction parameters was done. The same correlation was then applied to gas barrier properties and trends identical to mechanical properties were observed. Thereby it was shown that a strong relationship exists between properties of a system and solubility parameters in solution mixing process. © 2014 Society of Plastics Engineers.

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2014

Journal Article

A. Sivan and Deepthi, A., “Facile synthesis of 1,2,3-tricarbonyls from 1,3-dicarbonyls mediated by cerium(IV) ammonium nitrate”, Tetrahedron Letters, vol. 55, pp. 1890-1893, 2014.[Abstract]

A mild and efficient protocol for the synthesis of vicinal tricarbonyl compounds from β-dicarbonyls in a single step using cerium(IV) ammonium nitrate as a catalytic oxidant is described. Ease of execution, wide substrate scope and the suitability for the synthesis of commercially important compounds like ninhydrin, alloxan and oxoline make this reaction particularly noteworthy. More »»

2014

Journal Article

Dr. Saritha A. and Joseph, K., “Immobilizing polymer chains in chlorobutyl rubber nanocomposites”, Society of Plastics Engineers (SPE), 2014.[Abstract]

The varying organic modification, lattice spacing, and concentration of added nanoclays have a profound effect on the constrained polymer volume in chlorobutyl rubber nanocomposites. More »»

2013

Journal Article

Dr. Zeena S. Pillai, Ceroni, Pb, Kubeil, Mc, Heldt, J. - Mc, Stephan, Hc, and Bergamini, Gbd, “Dendrimers as Nd3+ ligands: Effect of generation on the efficiency of the sensitized lanthanide emission”, Chemistry - An Asian Journal, vol. 8, pp. 771-777, 2013.[Abstract]

We have designed two novel dendrimers with cyclam cores with appended poly(amido amine) (PAMAM) dendrons, decorated at the periphery with four and eight dansyl chromophores, respectively. The photophysical properties of the dendrimers and their Nd3+ complexes have been investigated. The energy-transfer efficiency to the lanthanide ions from these dendrimers has been studied as a function of the generation. It has been observed that an increase in the dendrimer generation as well as the number of amide units enhances the energy transfer to the lanthanide ion. Shine on: Two novel cyclam-core-based dendrimers with appended poly(amido amine) (PAMAM) dendrons, decorated at the periphery with four and eight dansyl chromophores, respectively, have been synthesized and characterized. Upon titration with Nd3+ it has been observed that an increase in the dendrimer generation as well as the number of amide units enhances the efficiency of the energy transfer to the lanthanide ion. Copyright © 2013 WILEY-VCH Verlag GmbH &amp; Co. KGaA, Weinheim.

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2013

Journal Article

R. Nath, A A Tsirlin, P Khuntia, O Janson, T Forster, Prof. M. Padmanabhan, J Li, Yu Skourski, M Baenitz, H Rosner, and I. Rousochatzakis, “Magnetization and spin dynamics of the spin S=1/2 hourglass nanomagnet Cu 5 (OH) 2 (NIPA) 4 10H 2 O”, Physical Review B, vol. 87, p. 214417/115, 2013.[Abstract]

We report a combined experimental and theoretical study of the spin S=12 nano magnet Cu5(OH)2(NIPA)4⋅10H2O (Cu5-NIPA). Using thermodynamic, electron spin resonance, and 1H nuclear magnetic resonance measurements on one hand, and ab initio density-functional band-structure calculations, exact diagonalizations, and a strong-coupling theory on the other, we derive a microscopic magnetic model of Cu5-NIPA and characterize the spin dynamics of this system. The elementary fivefold Cu2+ unit features an hourglass structure of two corner-sharing scalene triangles related by inversion symmetry. Our microscopic Heisenberg model comprises one ferromagnetic and two antiferromagnetic exchange couplings in each triangle, stabilizing a single spin S=12 doublet ground state (GS), with an exactly vanishing zero-field splitting (by Kramers' theorem), and a very large excitation gap of Δ≃68 K. Thus, Cu5-NIPA is a good candidate for achieving long electronic spin relaxation (T1) and coherence (T2) times at low temperatures, in analogy to other nanomagnets with low-spin GS's. Of particular interest is the strongly inhomogeneous distribution of the GS magnetic moment over the five Cu2+ spins. This is a purely quantum-mechanical effect since, despite the non frustrated nature of the magnetic couplings, the GS is far from the classical collinear ferrimagnetic configuration. Finally, Cu5-NIPA is a rare example of a S=12 nano magnet showing an enhancement in the nuclear spin-lattice relaxation rate 1/T1 at intermediate temperatures.

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2013

Journal Article

M. S. Suresh and Prof. M. Padmanabhan, “Synthesis and characterization of axially linked heteroleptic polymeric and monomeric lewis base adducts of BIS-(2-mercaptobenzothiazolato) Nickel(II) and its extraordinary thermal decomposition”, Asian Journal of Chemistry, vol. 25, pp. 7669-7674, 2013.[Abstract]

{Six coordinated axially bridged heteroleptic polymeric and monomeric Lewis base adducts from coordinatively unsaturated bis-(2-mercaptobenzothiazolato) nickel(II) {Ni(mbt)2, [NiC14H8N 2S4]} have been synthesized and charecterized by elemental analysis, spectral techniques, magnetic susceptibility measurements and thermal analysis using coordination sphere expansion method. These adducts have general molecular formula [Ni(mbt)2L]n for polymeric adducts and [Ni(mbt)2L2] for monomeric adducts, where L = pyrazine, 4,4′-bipyridine and 4,4′-azopyridine

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2013

Journal Article

S. L. Linguito, X. Zhang, Prof. M. Padmanabhan, A.V. Biradar, Jing I. Li, T. Xu, T.J. Emge, and T Asefa, “New polyoxomolybdate compounds synthesized in situ using ionic liquid 1-butyl-3-methyl-imidazolium tetrafluoroborate as green solvent”, New Journal of Chemistry, vol. 37, pp. 2894-2901, 2013.[Abstract]

Herein we report the facile, green syntheses of three new polyoxomolybdate-based inorganic-organic hybrid materials using room temperature ionic liquid (RTIL), 1-butyl-3-methyl-imidazolium tetrafluoroborate (bmim)[BF4], as a green and reactive solvent. The organic imidazolium component of the RTIL was incorporated into all three structures, the μ5-oxo octamolybdate cluster compound (bmim)3NH 4[Mo8O26] (1) and two Keggin-type cluster compounds, one being a charge transfer salt (bmim)4[PMo VMo11O40] (2) and the other having the unreduced anion (bmim)3[PMo12O40] (3). Phase pure and highly crystalline samples were obtained. In 1 the Mo8O 26 moiety is a tetranionic cluster in its β phase. Compound 1 contains three bmim cations and an NH4 + molecule to complement the -4 charge on the octamolybdate anion. The α-phase Keggin-type anion in 2, [PMoVMo11O40] 4-, contains one Mo atom in the +5 oxidation state, indicating that 2 is a charge transfer complex. The α-phase Keggin-type anion in 3, [PMo12O40]3-, has 12 fully-oxidized Mo atoms. Compound 3 has a band gap ∼3.5 eV. The catalytic nature of compound 3 in the oxidation of styrene to benzaldehyde was investigated. The maximum styrene conversion was 83%, while the maximum selectivity to benzaldehyde was 96.5%. The catalyst was successfully used for five cycles without significant loss in activity or selectivity. The structure of the catalyst remains unchanged after repeated use. Our work points to the feasibility of generating a wide variety of new and useful POM-based compounds through a 'green' synthesis route. © 2013 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.

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2013

Journal Article

R. Nath, A.A. Tsirlin, P. Khuntia, O. Janson, T. Förster, Prof. M. Padmanabhan, Jing I. Li, Y. Skourski, M. Baenitz, Rosner, H., and Rousochatzakis, I., “Magnetization and spin dynamics of the spin S=12 hourglass nanomagnet Cu5(OH)2(NIPA)4·10H2O”, Physical Review B - Condensed Matter and Materials Physics, vol. 87, 2013.[Abstract]

We report a combined experimental and theoretical study of the spin S=12 nanomagnet Cu5(OH)2(NIPA)4·10H 2O (Cu5-NIPA). Using thermodynamic, electron spin resonance, and 1H nuclear magnetic resonance measurements on one hand, and ab initio density-functional band-structure calculations, exact diagonalizations, and a strong-coupling theory on the other, we derive a microscopic magnetic model of Cu5-NIPA and characterize the spin dynamics of this system. The elementary fivefold Cu2+ unit features an hourglass structure of two corner-sharing scalene triangles related by inversion symmetry. Our microscopic Heisenberg model comprises one ferromagnetic and two antiferromagnetic exchange couplings in each triangle, stabilizing a single spin S=12 doublet ground state (GS), with an exactly vanishing zero-field splitting (by Kramers' theorem), and a very large excitation gap of Δâ‰ 68 K. Thus, Cu5-NIPA is a good candidate for achieving long electronic spin relaxation (T1) and coherence (T2) times at low temperatures, in analogy to other nanomagnets with low-spin GS's. Of particular interest is the strongly inhomogeneous distribution of the GS magnetic moment over the five Cu2+ spins. This is a purely quantum-mechanical effect since, despite the nonfrustrated nature of the magnetic couplings, the GS is far from the classical collinear ferrimagnetic configuration. Finally, Cu5-NIPA is a rare example of a S=12 nanomagnet showing an enhancement in the nuclear spin-lattice relaxation rate 1/T1 at intermediate temperatures. © 2013 American Physical Society.

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2013

Journal Article

P. Ash, Bist, A., and Dr. Smitha Chandran S., “Moving towards Zero-Waste: A Case-Study from Kerala, India”, IEEE Global Humanitarian Technology Conference, South Asia Satellite Conference, Trivandrum, India, 2013.[Abstract]

The Amrita Institute of Medical Sciences is a 1450 - bed super-specialty hospital located in Kochi, Kerala, India. The hospital was founded by the world-renowned humanitarian and spiritual leader Amma, Sri Mata Amritanandamayi Devi, who envisioned an advancedcenter for serving the poor and suffering. Inspired by Amma’s vision of zero-waste, the hospital undertook its journey with a view to also reducing massive greenhouse gas emissions that result from improper handling of waste. Today, the hospital manages its municipal solid waste on an industrial scale, composting some eight metric tons of organic waste daily. This case study outlines the path followed to achieve zero-waste. Alongside, the rehabilitation of a former dump site is described in detail; at this very site are carried out all composting operations of AIMS More »»

2013

Journal Article

S. .A, “Nanocomposites from chlorobutyl rubber for advanced applications”, National Conference on Recent trends in Material Science & Technology , 2013.

2012

Journal Article

Dr. Saritha A., Joseph, Kc, Thomas, Sd, and Muraleekrishnan, Re, “Chlorobutyl rubber nanocomposites as effective gas and VOC barrier materials”, Composites Part A: Applied Science and Manufacturing, vol. 43, pp. 864-870, 2012.[Abstract]

The field of polymer nanocomposites has attracted attention as a method of enhancing polymer properties and extending their utility by using molecular or nanoscale reinforcements rather than conventional particulate filled nanocomposites. These materials exhibit behavior different from conventional composite materials with micro scale structure due to small size of structural unit and high surface to volume ratio. Chlorobutyl rubber nanocomposites were prepared using organically modified cloisite 15 A and characterized using XRD and TEM. The gas barrier properties of the nanocomposites were modeled using the composite theories of permeation and the tortousity factors were predicted. Analysis of mechanical properties, transport and gas barrier properties of the nanocomposites as well as the calculation of break through times show the effectiveness of the material to be utilized as potential gas as well as VOC barrier materials. © 2012 Elsevier Ltd. All rights reserved.

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2012

Journal Article

M. S. Suresh and Prof. M. Padmanabhan, “Synthesis, thermal and spectral characterization of axially bridged polymeric and monomeric Lewis base adducts of bis (2-mercaptobenzothiazolato) cobalt (II)”, Rasayan Journal of Chemistry, vol. 5, pp. 311-320, 2012.[Abstract]

Octahedrally coordinated monomeric and axially bridged polymeric compounds from four coordinated cobalt(H) species have been synthesized and characterized by elemental analysis, infra red and electronic spectroscopy, magnetic susceptibility measurements and thermal analysis. The four coordinated system used was tetrahedral bis(2-mercaptobenzothiazolatocobalt(II), Co(mbt) 2 and ligands used were bidentate opposite end donors such as 4-aminopyridine, 4,4'-bipyridine and pyrazine. For comparison a monodentate ligand pyridine was also used. The complexes synthesized have the molecular formula [CoCmbt) 2L2] where L= pyridine and 4-aminopyridine and [Co(mbt)2L']n where L'= pyrazine and 4,4'-bipyridine. The infra red and thermal studies indicate that 4-aminopyridine is coordinated through its pyridyl nitrogen only, eventhough it is bidentate while others behave as bridging bidentate. These adducts have a trans octahedral structure which is preferable for extended linear framework, eventhough two isomeric forms are possible viz. cis and trans. The variation of magnetic moment on adduct formation was also carried out The thermal decomposition of Co(mbt)2 is seen taking place in two stages, in nitrogen atmosphere, with CoS, a stable residue. In the case of adducts an additional step was observed due to the loss Lewis bases used. The kinetic and mechanistic parameters were also evaluated from different decomposition stages. In most of the cases it follows Random nucleation, one nucleus on each particle obeying Mampel equation. © 2012 RASÄYAN. All rights reserved.

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2012

Journal Article

G. M.A and .Pillai, Z. S., “Synthesis and Antibacterial Screening of Novel derivatives of Embelin”, CRSI National Symposiium, 2012.

2012

Journal Article

S. .A and Joseph, K., “chlorobutyl rubber for advanced applications”, In the national conference INCCOM-11 ISAMPE sponsored seminar, 2012.

2007

Journal Article

G. K. Kumar, John, S., Augustine, P., Poduval, R., and Dr. Beena S., “A novel mebendazole selective membrane sensor and its application to pharmaceutical analysis”, 2007.[Abstract]

A PVC membrane sensor for the selective determination of mebendazole (MBZ) was fabricated. The sensor is based on an ion association of MBZ with silicotungstic acid (STA) as ion pair and bis(2-ethylhexyl)phthalate (BEP) as the plasticizing agent in a PVC matrix. The sensor showed a linear response for MBZ for a concentration range 1.0x10(-6)-5.0x10(-2) M with a Nernstian slope of 55.8 mV/decade (limit of detection 6.3x10(-7) M) in the pH range 4-7. It has a fast response time of <30 s. The sensor showed a very good selectivity for MBZ with respect to a large number of ions. The direct determination of MBZ in pharmaceutical formulations gave results that compare well with the data obtained from the standard method. More »»

Publication Type: Conference Paper

Year of Publication Publication Type Title

2017

Conference Paper

Sreedha Sambhudevan and B. Shankar, “Development of medical imaging X-ray shielding materials based on natural rubber/nano composites-thermal degradation studies”, in 2017 International Conference on Intelligent Sustainable Systems (ICISS), Palladam, India, 2017.[Abstract]

This paper discusses the development of X-ray shielding materials based on rare earth oxide and natural rubber materials. Medical imaging, as we know is currently using highly toxic lead containing garment for protection from harmful radiations. Both technicians as well as patients are suffering from the ill effects of radiation exposure to a great extent. The current research presented in this paper can be an alternative to the above mentioned problems. Rare earth oxide was used as filler in natural rubber matrix to prepare eco-friendly composites. The samples were analyzed to confirm the particle size, even distribution in matrix phase, mechanical properties and their response to high temperature conditions.

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2017

Conference Paper

Athira Krishnan, Bency Joseph, Krishna M Bhaskar, and S. M. A. Shibli, “Fabrication of PANI-TiO2 incorporated Ni-P electrode for alkaline water electrolysis”, in 2017 IEEE International Conference on Technological Advancements in Power and Energy (TAP Energy ), 2017.[Abstract]

Composite incorporated Ni-P electrodes were fabricated for alkaline water electrolysis. The effect of (Polyaniline) PANI-TiO2 polymer composite in hydrogen evolution efficiency of Ni-P electrode in NaOH medium was studied. Characterization of the composites was carried out by XRD and coating composition was confirmed by EDS analysis. Catalytic action of the fabricated electrodes was analysed by polarization and electrochemical impedance spectroscopic techniques. The optimized electrodes exhibited a lower overpotential value of 139 mV for hydrogen evolution reaction at 200 mA cm-2. The composite incorporated electrodes achieved enhanced catalytic activity as a result of improved active sites, increased surface roughness and decreased resistance for electron transfer reaction in comparison with pure Ni-P electrode.

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2017

Conference Paper

P. Varun and Dr. Smitha Chandran S., “Sustainable utilization of some noxious aquatic weeds by energy recovery using high solid anaerobic digesters”, in 2017 International Conference on Technological Advancements in Power and Energy ( TAP Energy), Kollam, India, 2017.[Abstract]

One of the options on which we zeroed in was utilization of weeds for generating energy as biogas via anaerobic digestion. This study makes an attempt to utilize some noxious aquatic weeds as a feedstock in High Solid Anaerobic Digesters (HSADs) for the recovery of energy. The specific objectives of the study were to fabricate lab scale HSADs for the digestion of organic fraction of some common noxious aquatic weeds and to evaluate the suitability of it as a feed stock in Anaerobic Digesters and the recovery of energy in terms of biogas. The findings indicate 4.873% of dry solids loss and 96.32% degradation of volatile solids at the end of the experiment for Typha latifolia with a total biogas yield of 14,175 ml and resulted into a total of 83,609 m3/m3digester volume and 4.168% of dry solids loss and 92.46% degradation of volatile solids at the end of the experiment for Pistia stratiotes with a cumulative biogas yield of 17,570 ml and resulted into a total of 83,609 m3/m3in 30 days. The performance of the reactors is similar with the values reported in earlier works. This waste utilization forms a sustainable solution for the management of organic fraction of municipal solid waste. Also the slurry from the bioreactor can be utilized as a bio fertilizer.

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2015

Conference Paper

Bindu P. Nair, T.K. Manojkumar, Dr. Sreedhar K. M., A.V. Mohamed, and Z. Hukuman, “Pyranone Benzene complexes as potential nano-flippers: A DFT study”, in 2015 International Conference on Advances in Computing, Communications and Informatics, ICACCI 2015, 2015, pp. 335-338.[Abstract]

Computational studies were carried out on Pyranone Benzene clusters at different charged states using density functional theory. The relative orientation of the two molecules depends on the charged state of the complex and this property can be utilized in designing nano-mechanical devices such as flippers or switches. © 2015 IEEE.

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2014

Conference Paper

P. Ash, Bist, A., and Dr. Smitha Chandran S., “Habitat Restoration: A case study from Kochi, Kerala, India”, in International Conference on Waste Management for Sustainable development (ICWMSD-2014), NSS Engineering College, Palakkad, 2014.

2014

Conference Paper

, Purushothaman, S., and Dr. Smitha Chandran S., “An Ecofriendly option for Management of Waste Water”, in National Seminar on Contemporary Techniques in Environmental Research and Conservation (CTERC-2014, All Saints’ College, 2014.

2014

Conference Paper

A. Guleria, Asok.V, S., and Dr. Smitha Chandran S., “Hydrological studies of a small watershed area of Karamana River basin using GIS ‘in”, in National Seminar on Contemporary Techniques in Environmental Research and Conservation (CTERC-2014), All Saints’ College, Thiruvananthapuram, 2014.

2014

Conference Paper

, K.K, V., and Pillai, D. Zeena S., “Photo induced morphological changes of silver nanoparticles”, in National Seminar on Current Trends in Chemistry CTriC 2014, 2014.

2014

Conference Paper

Dr. Saritha A., Sebastian, R., and K., S., “Synergistic effect of CNT and Nanoclay on the properties of chlorobutyl rubber nanocomposites”, in National Conference on material science and Technology held at Indian Institute of Space Science and Technology,, Trivandrum , 2014.

2014

Conference Paper

S. T, R, A. A., and Sambhudevan, S., “Effect of co-precipitated nickel ferrite on the mechanical and magnetic properties of natural rubber-ferrite composites”, in Effect of co-precipitated nickel ferrite on the mechanical and magnetic properties of natural rubber-ferrite composites at National conference on material science and technology,, Thiruvananthapuram, 2014.

2013

Conference Paper

Dr. Smitha Chandran S. and , “Utlilization of Limnocharisflava, an invasive exotic aquatic weed from Kuttanad wetland ecosystem as a potential feedstock for aquaculture”, in International Seminar on Advances in Aquaculture Technologies (ISATT-2013), Department of Zoology, All Saints College Thiruvananthapuram, 2013, pp. 53-55.

2013

Conference Paper

P. Ash, Sullivan, D., Kothurkar, N. K., Bist, A., and Dr. Smitha Chandran S., “Rehabilitating former landfill sites: A case study in habitat restoration”, in Global Humanitarian Technology Conference (GHTC), 2013 IEEE, 2013.[Abstract]

This paper describes the dramatic success in the eco-restoration of a heavy-metal contaminated open garbage dump. A number of heavy metals (As, Cd, Cu, Co, Pb, Hg, Cr) were detected in the soil and river sediment at the site. The main restoration activities included mulching, surface-addition of compost and fresh soil and phytoremediation using vetiver and other plants. Within three years of the restoration activities, heavy metal concentrations in the contaminated soil reduced drastically. There was relatively low uptake of the heavy metals by the plants; however, they might have been crucially responsible for providing a favorable environment for soil-restoring microrganisms in their rhizosphere. Observable habitat-restoration continues at the site, including the return of birds and insects and other wildlife, making this an ideal site for further research and demonstration for community awareness and education. More »»

2013

Conference Paper

S. Sambhudevan and , “Rubber composites with enhanced EMI Sheilding”, in Conference on Recent trends in Material Science & Technology, IIST Thiruvananthapuram, 2013.

2013

Conference Paper

S. Sambhudevan and , “X-Ray Shielding performance of modified Gadolinium oxide based natural rubber composites”, in International Conference on Emerging Trends in Chemical Sciences VIT University, Vellore Tamil Nadu, 2013.

2012

Conference Paper

B. S and Kumar, G., “Fabrication of PVC membrane sensor for Gadolinium”, in National conference organized by KONGU, 2012.

2012

Conference Paper

A. K.M. and Chandran, S., “Variation in Air Pollution Tolerance Index of some common plants near The Kerala Minerals”, in National Conference on Recent Trends in Chemistry organized by Department of Chemistry, Chavara, Kollam, 2012.

2012

Conference Paper

, M.A, G., and Joy, B., “Synthesis and Antibacterial Screening of novel derivatives of 2,5-dihydroxy-3-undecyl1-1,4-benzoquinone”, in National Conference sponsored by DST & BRNS, Kongu Engineering College, Erode , 2012.

2012

Conference Paper

S. .A, Joseph, K., and Sabu Thomas, “Dielectric properties of chlorobutyl rubber nanocomposites”, in International conference on Natural Polymers, MG University, Kottayam, 2012.

2011

Conference Paper

Dr. Krishnashree Achuthan, Sreelatha, K. S., Surendran, S., Dr. Shyam Diwakar, Prof. Nedungadi, P., Humphreys, S., Dr. Sreekala C. O., Dr. Zeena S. Pillai, Raghu Raman, Deepthi, A., Gangadharan, R., Dr. Saritha A., Ranganatha, J., Sreedha Sambhudevan, and Mahesh, S., “The VALUE @ Amrita Virtual Labs Project: Using Web Technology to Provide Virtual Laboratory Access to Students”, in Global Humanitarian Technology Conference (GHTC), 2011 IEEE, 2011, pp. 117-121.[Abstract]

In response to the Indian Ministry of Human Resource Development (MHRD) National Mission on Education through Information and Communication Technology (NME-ICT) Initiative, the Virtual and Accessible Laboratories Universalizing Education (VALUE @ Amrita) Virtual Labs Project was initiated to provide laboratory-learning experiences to college and university students across India who may not have access to adequate laboratory facilities or equipment. These virtual laboratories require only a broadband Internet connection and standard web browser. Amrita Vishwa Vidyapeetham University is part of a consortium of twelve institutions building over two hundred virtual labs covering nine key disciplines in science and engineering. This National Mission project hopes to reach out to India's millions of engineering and science students at both undergraduate and postgraduate levels. The Virtual Labs Project is providing virtual laboratory experiments that directly support the All India Council for Technical Education (AICTE) and the University Grants Commission (UGC) model curricula for engineering and sciences undergraduate and postgraduate programs.

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Publication Type: Book Chapter

Year of Publication Publication Type Title

2016

Book Chapter

K. Y. Sandhya, Dr. Saritha A., and Joseph, K., “Liquid Crystalline Polymers from Renewable Resources: Synthesis and Properties”, in Liquid Crystalline Polymers: Volume 1–Structure and Chemistry, K. Vijay Thakur and R. Kessler, M. Cham: Springer International Publishing, 2016, pp. 273–306.[Abstract]

Materials from renewable sources are attracting immense attention due to the excellent properties and ecological advantages it can offer and due to the growing environmental concerns. Liquid crystalline polymers (LCP) from renewable sources have engrossed considerable attention during the past few decades. Nowadays, agro based renewable materials are the subject of a growing number of academic and industrial research projects, because of diminishing fossil resources combined with the increasing environmental concern of petroleum based polymers. Renewable resources such as cellulose, vegetable oils and other plant and animal originated products are ideal alternatives to provide base chemicals for various materials, as they are abundant throughout the world and contain several reactive chemical sites such as double bonds, allylic carbons, ester groups, and the alpha carbons of the ester groups, which can be used for polymerization. LCPs can be successfully synthesized from a good number of natural sources including cardanol, castor oil and can be derived from biopolymers such as cellulose, DNA, proteins etc. The study of liquid crystal phases of cellulosic esters and ethers become attractive owing to their properties such as toughness and processability. Cardanol obtained from cashew nut shell liquid possesses functional groups for creating polymers and has interesting structure for exhibiting liquid crystalline properties. Cardanol based LCP can form cross linked network polymers due to the unsaturation of side chains and possibly can freeze the liquid crystalline phase. On the other hand liquid crystal properties of cellulose in electro optical applications open new horizons for these traditional materials. A milestone in the development of nano cellulose science and technology is the discovery of cellulose nano crystals (CNC) from natural cellulose sources. CNC is made from cellulose which is a natural polymer of wide abundance and is an almost non-exhausting source. These nanofibrils under particular concentration can form ordered structures leading to lyotropic liquid crystals. It was noticed that rod like CNC can form a stable chiral nematic liquid crystalline phase. The chiral nematic (cholesteric) phase thus formed is characterized by long-range orientational order of the nanorods combined with a helical modulation of the direction in which they align. The intriguing ability of CNCs to self-organize into a cholesteric liquid crystal phase with a helical arrangement has attracted significant interest, as this arrangement gives dried CNC films a photonic band gap. Thus formed film has attractive optical properties, creating possibilities for use in applications such as security papers and mirrorless lasing. Controlling and understanding the mechanisms of liquid crystalline self-assembly of LCPs are not only of fundamental importance but are steps along the route to produce novel materials with desirable optical or mechanical properties. Nanostructured films with a photonic band gap phase of CNC suspensions arising from the spontaneous helix formation in the cholesteric liquid crystal have been the focus of several studies. The use of CNC suspension as a self-assembled template for the synthesis of inorganic materials offers a promising and versatile platform to fabricate multifunctional mesoporous materials with photonic crystal properties of very large surface areas. The combination of CNC and inorganic materials with higher refractive indices may lead towards photonic devices such as tunable mirrorless lasers, and CNC-templated materials with specific surface functionalities may pave way for the development of enantioselective sensors. In the proposed chapter we would discuss the different methods of synthesis of LCPs using renewable sources like cellulose, cardanol etc., chemical functionalization and characterization of cellulose, nano cellulose and their derivatives and their subsequent self organization into LCPs. The structural as well as phase transitions will be discussed in detail with various characterization techniques. A brief overview on the future scope of research and applications in the aforementioned field will also be given. More »»

2013

Book Chapter

Dr. Saritha A., Malhotra, S. K., Thomas, S., Joseph, K., Goda, K., and Sreekala, M. S., “State of the Art – Nanomechanics”, in Polymer Composites, vol. 11, Wiley-VCH Verlag GmbH & Co. KGaA, 2013, pp. 1–12.[Abstract]

This chapter contains sections titled: * Introduction * Nanoplatelet-Reinforced Composites * Exfoliation–Adsorption * In Situ Intercalative Polymerization Method * Melt Intercalation * Nanofiber-Reinforced Composites * Characterization of Polymer Nanocomposites * Recent Advances in Polymer Nanocomposites * Future Outlook * References

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2013

Book Chapter

Dr. Saritha A. and Joseph, K., “Barrier Properties of Nanocomposites”, in Polymer Composites, Wiley-VCH Verlag GmbH & Co. KGaA, 2013, pp. 185–200.[Abstract]

This chapter contains sections titled: * Introduction * Nanocomposites from Ceramic Oxides * Nanocomposites from Nanotubes * Layered Silicate Nanocomposites * Composite Models of Permeation * Techniques Used to Study the Permeability of Polymers and Nanocomposites * Calculation of Breakthrough Time * Applications * Conclusions * References More »»

2012

Book Chapter

Dr. Zeena S. Pillai and Joy, B., “Chemoprofiling and Antioxidant Activity Studies of Shilajit – A Herbal Composition”, in Utilisation and management of Medicinal Plants, vol. 2, New Delhi: Daya Publication House, 2012, pp. 273-287.

Publication Type: Conference Proceedings

Year of Publication Publication Type Title

2014

Conference Proceedings

L. S. Kumar, Nair, S. M., and Dr. Smitha Chandran S., “Recovery Of Energy From Organic Fraction Of Municipal Solid Waste By High Solid Anaerobic Digestion”, The National Seminar on Contemporary Techniques in Environmental Research and Conservation (CTERC-2014) . All Saints’ College, Thiruvananthapuram , 2014.

2014

Conference Proceedings

Sreedha Sambhudevan, Shankar, B., Dr. Saritha A., and Joseph, K., “Rare earth oxide filled natural rubber composites: Synthesis, characterization and x ray shielding”, International conference on advanced functional materials held at NIIST. Trivandrum , 2014.

2013

Conference Proceedings

L. S. Kumar and Dr. Smitha Chandran S., “High Solid Anaerobic Digestion for the recovery of Energy from Organic Fraction of Municipal Solid waste”, The International Conference on Emerging Trends in Chemical Sciences . VIT University, Vellore TamilNadu, 2013.

2012

Conference Proceedings

S. Chandran and Arjun, K. M., “Changes in Air Pollution Tolerance Index of some common plants near The Kerala Minerals, and Metals Limited”, National Conference sponsored by DST & BRNS. Kongu Engineering college, 2012.

207
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