Qualification: 
Ph.D, MSc, B.Ed.
sreedha@am.amrita.edu

Dr. Sreedha Sambhudevan, currently serves as Assistant Professor (Sr.Gr.) in the department of Chemistry, Amrita School of Arts and Sciences, Amritapuri. She did her PhD in polymer chemistry from Amrita Vishwa Vidyapeetham. She has more than 8 years of research experience in nano-filled polymers composites. Dr. Sreedha joined the department of Chemistry in Amrita in 2002.

Her research interests include Polymer micro and nano composites, rubber nanocomposites, green composites, green synthesis of nanomaterials, conducting polymer composites, geopolymers, development of flexible magnets, EMI shielding materials.

She has several international publications, book chapters and many international and national conference publications to her credit.

Projects Undertaken

  1. Principal co-developer in MHRD sponsored project Development of suitable pedagogical methods for development of online course in Engineering chemistry
  2. Developer of Inorganic Chemistry lab in MHRD sponsored project under National Mission on Education through ICT.

Invited Lecture

  1. Delivered an invited lecture in the National seminar on Advances in polymer technology held at government college, Attingal on November 28, 2013.
  2. Delivered an invited lecture in association with student induction programme held at government college Nattakam, Kottayam on July 2015.

Workshops Attended

  1. National Workshop on NMEICT – MHRD sponsored project entitled “ Developing Suitable Pedagogical Methods, Intellectual Calibers and research in E-learning held at CII, NIT, Warangal on 9thand 10th August 2013
  2. US- India brain storming discussion on faculty developmemt on January 6, 2014 at Center of Nano Science and Technology, Kottayam.
  3. MOOC workshop organized by IIT Mumbai for development of ICT enabled courses on 2018.

Professional Roles

  • Reviewer of Polymer Bulletin
  • Reviewer of Journal of Elastomers and Plastics

Publications

Publication Type: Conference Proceedings

Year of Publication Title

2019

Aiswarya R. Nair, Sreedha Sambhudevan, and Balakrishnan Shankar, “Synthesis, Characterization and Dye Removal Properties of Cellulose Nanocrystals Embedded Natural Rubber Latex Composite”, Cellulose Chemistry and Technology. 2019.[Abstract]


Cellulose nanocrystals (CNCs) were prepared from bleached wood pulp by the acid hydrolysis method. CNCs were characterized by Fourier Transform Infrared Spectroscopy (FTIR) and X-Ray Diffraction (XRD). Natural rubber latex was oxidised using potassium permanganate. The oxidation of latex was confirmed using FTIR and UV-Visible Spectroscopy. Natural rubber latex composites were prepared using the as-prepared CNCs in two different weight percentages. Mechanical studies and microscopy analysis proved that the incorporation of CNCs into NR latex improved all the properties. Due to the presence of surface hydroxyl groups of CNCs, which can be exchanged with almost any contaminant ions present in water, the developed materials can be utilized for water purification. The composites effectively removed 92%, 79% and 67%, respectively, of basic dyes such as Victoria blue BO, Methyl violet 10B and Holacryl pink FG. The dye removal can be explained by the electrostatic attraction between the negatively charged CNCs and the positively charged dyes.

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2019

K. Nair, Sreedha Sambhudevan, and Balakrishnan Shankar, “Synthesis, Characterization and Dye Absorbing Properties of Cellulose Acetate from used Cigarette Buds”, Materials Today: Proceedings, vol. 18. pp. 5006 - 5011, 2019.[Abstract]


Water pollution is a great threat to humanity nowadays. Scientists are searching for new natural materials that can act as absorbents to remove non-biodegradable pollutants. Dye waste from textile, paint and leather industries are a great danger to aquatic system. Nowadays activated charcoal is widely used for this purpose, but the high cost impose some limitations to its wide use. Cellulose acetate was synthesized from a waste material, used cigarette bud, by acid treatment method. The sample obtained was characterized using Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). Cellulose acetate membranes were prepared and utilized for dye absorption studies using UV-visible spectroscopy and colorimeter using pH controlled solutions of methylene blue and malachite green.

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2019

B. Jose, Sreedha Sambhudevan, and Balakrishnan Shankar, “Mechanical and Conducting Properties of Polyaniline Doped Natural Rubber Nanocomposites”, Materials Today: Proceedings, vol. 18. pp. 4901 - 4905, 2019.[Abstract]


Conducting flexible nanocomposites were prepared based on polyaniline and natural rubber. These materials have a wide range of applications which include antistatic and anticorrosion coatings, batteries and sensors, organic electronic materials and electromagnetic wave shielding. Polyaniline (PANI) was prepared from aniline in a very simple and economical method. The prepared PANI was characterized using Fourier Transfer Infrared spectroscopy (FTIR), Scanning Electron Microscope (SEM) and X ray Diffraction (XRD) to confirm the synthesis and particle size. PANI was introduced into natural rubber matrix using conventional method of mixing at different proportions. The mechanical studies of prepared nanocomposites confirms the uniform distribution of nanopowders in the matrix, Electrical conductivity of natural rubber increases 5 times on the addition of 20% of PANI.

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2019

A. Anil, Sreedha Sambhudevan, Sreekala, C. O., and Shankar, B., “Effect of Silver Nanoparticle in the PEDOT: PSS Counter Electrode of Dye Sensitized Solar Cell”, AIP Conference Proceedings, vol. 2162. p. 020123, 2019.[Abstract]


In this study, a conducting polymer PEDOT: PSS counter electrode is introduced in a typical DSSC (Dye Sensitized Solar Cell) with N719 dye adsorbed TiO2 nanoparticle coated FTO (Flourine doped Tin Oxide) glass as photo anode and an iodide-triiodide system as electrolyte. Counter electrode modification is done by introducing silver nano particles (NPs) along with PEDOT:PSS to heighten the performance of DSSCs. Five unlike counter electrodes are made by PEDOT: PSS, PEDOT:PSS+ 25wt% Ag np, PEDOT:PSS+ 50wt% Ag np, PEDOT:PSS+ 75wt% Ag np, PEDOT:PSS+ 100wt% Ag nanoparticles respectively,DSSCs are fabricated, photovoltaic parameters are measured and related with the standard platinum counter electrode. Themorphology of the counter electrodes is studied by FESEM analysis. The thickness of different photo cathodes is studied by ellipsometry. It is found that as the weight% of Silver nanoparticle is increasing the efficiency of the device is also increasing. The photovoltaic conversion efficiency of the device with PEDOT:PSS+75wt%Agnp is giving 3.75% efficiency. But for PEDOT: PSS+ 100wt% Agnp, the efficiency decreases to 3.05%. This is because as the weight percentage of silver nanoparticle increases, due to its metallic nature, it acts as a hole trapping material than the hole conducting material.

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2019

M. Sajith, Jose, B., Sreedha Sambhudevan, Sreekala, C. O., and Shankar, B., “Effect of Matrix Type and Doping on Polyaniline based Natural Rubber Nanocomposites”, AIP Conference Proceedings, vol. 2162. p. 020109, 2019.[Abstract]


Conducting flexible nanocomposites were prepared based on polyaniline (doped/un-doped) and natural/nitrile rubber. These materials have a variety of applications like antistatic and anticorrosion coatings, batteries and sensors, organic electronic materials and electromagnetic wave shielding. Polyaniline (PANI) was prepared from aniline in a very simple and economical method [1]. Polyaniline is then doped using hydro bromic acid and citric acid at different molar ratios [2]. The prepared samples were characterized using Fourier Transfer Infrared spectroscopy (FTIR), Scanning Electron Microscope (SEM) and X-ray Diffraction (XRD) to confirm the synthesis and particle size. These conducting nano particles were introduced into natural and nitrile rubber matrix using conventional method of mixing at different proportions [3]. Two different rubber matrices were selected to compare the effect of matrix type on the conductivity of resultant composites. The mechanical studies of prepared nanocomposites confirms the uniform distribution of nano powders in the matrix. As the loading of filler in composite increases, a reduction in mechanical property was observed which may be due to the agglomeration of nanoparticles during composite preparation step. Current-voltage measurements were done in Keithley 2420A source meter in voltage range of 0 to 50 Volt. Electrical conductivity of natural rubber increases 5 times on the addition of 20% of PANI, while the increase was up to 15% when doped PANI was introduced. Nitrile rubber samples show superior conductivity than natural rubber samples which may be attributed to the inherent conducting nature of nitrile rubber.

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2019

D. P. Anjali, Jitha, R., Sajeev, C. J., Sreedha Sambhudevan, and Balakrishnan Shankar, “Effect of Matrix type on the Mechanical and Magnetic Properties of Ferrite based Natural and Nitrile Rubber Nanocomposites”, IOP Conference Series: Materials Science and Engineering, vol. 577. IOP Publishing, p. 012097, 2019.[Abstract]


Copper doped nickel ferrite particles were prepared using co-precipitation method. The prepared particles were analysed using FTIR, XRD and SEM to confirm the formation of spinel ferrite structures, particle size and distribution. These ferrite nanoparticles are then embedded in natural and nitrile rubber at different loadings to compare the effect of matrix type on the mechanical and magnetic properties of composite samples. Nitrile rubber (NBR) composites show excellent magnetic properties than natural rubber (NR) composites. Saturation magnetisation, magnetic coercivity and magnetic retentivity values of NBR composites are superior to NR composites. In contrast mechanical properties are found to be inferior for NBR composites.

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2017

Sreedha Sambhudevan and B. Shankar, “Development of Medical Imaging X-ray Shielding Materials based on Natural Rubber/Nano Composites-thermal Degradation Studies”, 2017 International Conference on Intelligent Sustainable Systems (ICISS). 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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2014

Sreedha Sambhudevan, Balakrishna Shankar, Dr. Saritha A., and Kuruvilla Joseph, “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

Sreedha Sambhudevan, Blakrishna Shankar, and Dr. Saritha A., “Natural rubber composites, synthesis , characterization and x ray shielding properties”, International conference on advances in chemistry. VIT, 2013.

2013

Sreedha Sambhudevan, Blakrishna Shankar, and Dr. Saritha A., “Rubber composites with enhanced EMI shielding”, National Conference on Recent Trends in Material Science and Technology, NCMST. The Indian Institute of Space science and Technology, ISRO, Trivandrum, 2013.

2012

Sreedha Sambhudevan, Blakrishna Shankar, Dr. Saritha A., and Kuruvilla Joseph, “Rubber composites with enhanced EMI shielding”, The International Conference on Natural polymers, ICNPC-2012 . Mahatma Gandhi University, Kottayam , 2012.

Publication Type: Journal Article

Year of Publication Title

2018

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

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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2016

Sreedha Sambhudevan, Balakrishnan Shankar, Kuruvilla Joseph, John Philip, T Saravanan, and Dr. Saritha A., “Development of X-ray Protective Garments from Rare Earth-modified Natural Rubber Composites”, Journal of Elastomers & Plastics, pp. 1-18, 2016.

2016

Sreedha Sambhudevan, Balakrishnan Shankar, Dr. Saritha A., and Kuruvilla Joseph, “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.

2015

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 »»

2015

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 »»

Publication Type: Conference Paper

Year of Publication Title

2016

Sreedha Sambhudevan, Sankar S Menon, Krishna, R., Wilson, L., and Balakrishnan Shankar, “Physico Mechanical Properties of Nano Nickel Ferrite/natural rubber Composites”, in Fourth International Conference on Polymer Processing and Characterization,, M G University, Kottayam, 2016.

2016

Sreedha Sambhudevan, Sreevalsa S, Sreekumar, S., and Balakrishnan Shankar, “Cure Characteristics and Swelling Properties of Organically Modified Lanthanum Oxide-Natural Rubber Composites”, in International conference on Material science and Technology, St Thomas College Pala, 2016.

2015

Sreedha Sambhudevan, Balakrishnan Shankar, Saritha A, and Kuruvilla Joseph, “Synthesis and characterization of organically modified gadolinium oxide-Natural rubber composites as effective x-ray shielding materials”, in National conference on innovations in chemical science and technology, , 2015, vol. 1, pp. 86–91.[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.

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2011

Dr. Krishnashree Achuthan, K.S. Sreelatha, S. Surendran, Dr. Shyam Diwakar, Prof. Prema Nedungadi, S. Humphreys, Dr. Sreekala C. O., Dr. Zeena S. Pillai, Raghu Raman, A. Deepthi, Rathish Gangadharan, Dr. Saritha A., Jyothi Ranganatha, Sreedha Sambhudevan, and Suma Mahesh, “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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Faculty Research Interest: