Faculty
Giridhar Madras
Professor

Phone : +91-80-2293 2321
Email : giridhar at iisc.ac.in
Click here to visit the Lab Group Page


Education

- B.E., Chemical Engineering, Annamalai University (1988)
- M.Tech., Chemical Engineering, IIT Madras (1989)
- Ph.D., Chemical Engineering, Texas A&M University (1993)

Courses

- CH 202 Numerical Methods
- CH 207 Applied Statistics and Design of Experiments
- CH 237 Polymer Science and Engineering

Research

Our research group focuses on reaction kinetics, as applied to various systems and processes in the environmental and energy sector. Some of the major focus areas are as follows:

Reaction with Macromolecules

Degradation of plastics in solution is a new process and we are studying the kinetics and degradation rate of various polymers in solution. We have developed continuous distribution kinetic models to determine the rate parameters and the activation energies for polymer degradation from the time evolution of the molecular weight distributions. We have investigated the use of ultrasound, acids, microwaves and UV light as a means for polymerization and degradation. The kinetics of the reactions have been investigated and radical mechanisms are proposed to satisfactorily explain the experimental data. We have also developed new polymers as hydrogels and for use in tissue engineering.

Catalytic Reactions

Our approach is to develop several new materials that are used as catalysts for known reactions. We also propose new reaction pathways/mechanisms providing us with a method to develop new materials with superior properties. In this regard, we have synthesized new materials that work as photocatalysts for the degradation of a wide variety of dyes and organics that are common pollutants in waste water. We have also developed new catalysts for the three way catalysis and CO and hydrocarbon oxidation and proposed new mechanisms governing these reactions. All the catalytic reactions investigated in our studies have applications in the energy and environmental industries.

Reactions and Separations in Supercritical Fluids

Supercritical fluids have proven useful for the processing of biological materials and may provide an attractive alternative solvent for enzymatic catalysis. We are studying the use of lipases for transesterfication, esterification and hydrolysis reactions, which result in products that are used in the pharmaceutical and food industries. We have shown that cheap enzymes may be effectively used to achieve much higher conversions in supercritical carbon dioxide than that obtained in non-aqueous organic media like hexane. We also investigate the solubility and adsorption equilibria of organics in this media and develop new models for correlating the experimental results.
 

Awards & Honors

- Among top 1% scientists for more than 5000 citations, Web of Science
- Shanti Swarup Bhatnagar award, CSIR, India, 2009
- Presidential Swarnajayanthi Fellowship, DST, India, 2006
- Scopus Young Scientist, Elsevier, 2006
- Fellow, Indian National Science Academy
- Fellow, Indian National Academy of Engineering
- Fellow, Indian Academy of Sciences
- Associate Editor: Current Science, Bulletin of Material Science,
- International Journal of Polymer Science, Advanced Powder Technology

Publications

Publications:

1. D Jagadeesan, Y Sundarayya, Giridhar Madras and CNR Rao Direct conversion of calcium carbonate to C1-C3 hydrocarbons RSC Advances, 3, 7224-7229 (2013).

2. Shinde VM, Madras G Synthesis of nanosized Ce(0.85)M(0.1)Ru(0.05)O(2-d) (M=Si, Fe) solid solution exhibiting high CO oxidation and water gas shift activity. Applied Catalysis B: Environmental, 138-139:51-61 (2013).

3. Gupta S, Seethamraju S, Ramamurthy PC, Madras G Polyvinylbutyral based hybrid organic/inorganic films as a moisture barrier material. Industrial and Engineering Chemistry Research, 52(12):4383-94 (2013).

4. Singh SA, Madras G Photocatalytic degradation with combustion synthesized WO3 and WO3-TiO2 mixed oxides under UV and visible light. Separation and Purification Technology, 105:79-89 (2013).

5. Reddy SN, Madras G Measurement and correlation of quaternary solubilities of dihydroxybenzene isomers in supercritical carbon dioxide. Journal of Supercritical Fluids, 73:63-9 (2013).