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

Dr. Sreedha Sambhudevan currently serves as Assistant Professor (Senior Grade) at the Department of Chemistry, School of Arts and Sciences, Amrita Vishwa Vidyapeetham, Amritapuri.

Research

Ongoing Research Details

Currently working in two thrust areas

  1. Natural rubber nano composites for enhanced X-ray shielding
  2. Nickel ferrite natural rubber composites as promising flexible magnets

Publications

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

2017

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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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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Publication Type: Conference Proceedings

Year of Publication Title

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.

Faculty Research Interest: