Yogesh M. Joshi
Group Home Page http://home.iitk.ac.in/~joshi
- Structure and dynamics of Colloidal Glasses and Gels
- Soft Matter
- Rheology of Complex Fluids
- Polymer Science and Engineering, Polymer Nanocomposites
Our group is interested in understanding physical behavior and dynamics of structured fluids. We combine expertise from Chemical Engineering, Physics, Chemistry and Materials Science to understand molecular phenomena that is responsible for the flow behavior. Major thrust area of our group is to understand ageing and effect of deformation on the variety of soft glassy materials such as concentrated suspensions, glassy polymers and polymer nanocomposites. Common theme in all these systems is their jammed state wherein primary entity (particle or molecular segment) is physically arrested due to overall crowding of constituents. In such state, system explores only a small part of the phase space thereby leading to a glassy behavior. Recently we showed that how rheological characterization can give profound insight into the ageing of colloidal glasses compared to that of colloidal gels. We also investigated effect of deformation on the ageing suspensions and how influence of the same on relaxation dynamics can be used to predict long time rheological behavior of these materials. We are also involved in understanding rheological behavior of discotic nematic suspensions, particularly their intriguing flow behaviors that are industrially very important.
Honours and Awards
National Academy of Sciences (NASI) Scopus Young Scientist Awards (2012)
Department of Atomic Energy – Science Research Council (DAE – SRC) Outstanding Investigator Award (2012)
Indian Institute of Chemical Engineers (IIChE) Amar Dye Chem Award (2009)
Indian National Academy Engineering (INAE) Young Engineer Award (2008)
National Academy of Sciences (NASI) Young Scientist Platinum Jubilee Award (2008)
Indian National Science Academy (INSA) Medal for Young Scientist (2006)
Joshi Y. M. "Long Time Response of Aging Glassy Polymers,", Rheologica Acta, 53 (2014) DOI:10.1007/s00397-014-0772-4
Joshi Y. M. "Dynamics of Colloidal Glasses and Gels," Annual Reviews in Chemical and Biomolecular Engineering, (2014) 5, 181. (DOI:10.1146/annurev-chembioeng-060713-040230)
Saha D., Joshi Y. M., Bandyopadhyay, R.,"Investigation of the dynamical slowing down process in soft glassy colloidal suspensions: comparisons with supercooled liquids", Soft Matter, 10 (2014), 3292.
Kaushal M., Joshi Y. M. "Linear Viscoelasticity of Soft Glassy Materials," Soft Matter, 10 (2014), 1819.
Bhandari S., Murlidhar K., Joshi Y. M."Thermal Diffusivity and Viscosity of Suspensions of Disc Shaped Nanoparticles," Ind. Eng. Chem. Res., 52 (2013), 15114.
Kaushal M., Joshi Y. M. "Tailoring Relaxation Time Spectrum in Soft Glassy Materials", Journal of Chemical Physics, 139 (2013) 024904.
T. Dhavale, Jatav S., Y. M. Joshi "Thermally Activated Asymmetric Structural Recovery in a Soft Glassy Nano-Clay Suspension", Soft Matter, , 9 (2013), 7751-7756.
Bhandari S.S., Muralidhar K. and Joshi Y.M. "Enhanced thermal transport through a soft glassy nanodisk paste", Physical Review E, ,87, 022301 (2013). download
Shahin A. and Joshi Y. M. "Physicochemical Effects in Aging Aqueous Laponite Suspensions", Langmuir, 28, 15674−15686, (2012). download
Shaukat A., Kaushal M., Sharma A and Joshi Y.M. "Shear mediated elongational flow and yielding in soft glassy materials", Soft Matter, 8, 10107, (2012). download
Shahin A., Joshi Y. M., Cates M. E. "Delayed solidification of soft glasses: New experiments, and a theoretical challenge", Faraday Discussion, DOI: 10.1039/C2FD20005H (2012). download
Shahin A., Joshi Y. M. "Hyper-aging Dynamics of Nano-clay Suspension", Langmuir, 28 (13), 5826 - 5833,(2012). download
Gupta R., Baldewa B. and Joshi Y. M., "Time Temperature Superposition in Soft Glassy Materials", Soft Matter, in press (2012). download
Baldewa B. and Joshi Y. M., "Delayed Yielding in Creep, Time -Stress Superposition and Effective Time Theory for a Soft Glass", Soft Matter, 8, 789 - 796. (2012). download
Shaukat A.,Sharma A. and Joshi Y. M., "Squeeze flow behavior of (soft glassy) thixotropic material" Journal of Non-Newtonian Fluid Mechanics, 167, 9 - 17 (2012). download