Structure and Rheology of Soft nano-materials

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1 Structure and Rhelgy f Sft nan-materials Ygesh Jshi Cmplex Fluid Labratry Suthern Labratries 114 Tel jshi@iitk.ac.in

2 Jamming Jamming halts the mtin!

3 What if Jamming ccurs in materials!

4 Research n Sft Glassy Materials Due t high viscsity r physical jamming f cnstituent entities system des nt reach equilibrium This leads t strng histry dependence Predicting future dynamics f these materials is a challenge Sudden unjamming f material can cause failures, avalanches, accidents, catastrphes, huge lsses t an industry

5 Aqueus nan-clay suspensins nm 1 nm Lapnite is a smectite clay and ppularly used as a rhelgy mdifier in csmetic, paint, plymer, petrleum and fd industry

6 Fam Figure, curtesy Mike Dennin, UCI

7 Cncentrated Suspensins 2.3 mm diameter PMMA cllids in density matched slvent (cyclhexylbrmide + decalin) Figure, curtesy Tm Masn, UCLA

8 Cncentrated emulsin

9 Granular Materials

10 Typical behavir f such materials These are knwn as sft glasses Cntinuus change in the mrphlgy Cntinuus increase in elasticity and viscsity Increase in temperature enhances the rate f increase in viscsity Relevant Industries Persnal care industries (Unilever, P&G, etc.) Paints and plymer industry (Asian Paints, Nerlac, etc.) Chemical and Petrleum Industry (Reliance, Shell, etc.) Pharmaceutical Industry, Agrchemical, etc. (UPL, Reddys)

11 Electric r Magnetic field Structure and rhelgy f Elect and Magnet rhelgical fluids U U Electrically r magnetically plarizable particles frm a chain like structure in the directin f field Ptential applicatins in breaks, clutches, etc. Such structure demnstrates yield stress and the resists shear flw Under flw tw structures have been reprted in the literature Fluid Slid c-existence Lamellar structure whse surface nrmal is in the vrticity directin Electric r Magnetic field U

12 Tpics t be ffered (M.Tech. and Ph.D.) Rhe-ptical Studies Rhe - light scattering: Small angle, static and dynamic light scattering t mnitr structure and relaxatin behavir under flw Rhe micrscpe: T study evlutin f structure under flw Rhe ptics: When lked thrugh the crssed plarizers defrmatin induced anistrpy and its relaxatin can be studied

13 Other tpics t be ffered (M.Tech. and Ph.D.) Rhelgy f Pasty Materials (Experimental and theretical) Micrrhelgy f sft materials (Experimental and theretical) Rhe - light scattering/rhe - ptics f sft materials (Experimental and theretical) Dielectric behavir f ageing glasses n nan-particle suspensin (Experimental and theretical) Electr and Magnetrhelgical behavir f suspensins (Experimental and theretical)

14 Papers published in Authr(s) Year Title M. Kaushal, Y. M. Jshi* T. Dhavale, S. Jatav, Y. M. Jshi S. Bhandari, K. Muralidhar, Y. M. Jshi* A. Shahin, Y. M. Jshi* Y. M. Jshi,* A. Shahin, M. E. Cates* A. Shaukat, M. Kaushal, A. Sharma, Y. M. Jshi* B. Baldewa Y. M. Jshi* Tailring Relaxatin Time Spectrum in Sft Glassy Materials Thermally Activated Asymmetric Structural Recvery in a Sft Glassy Nan-Clay Suspensin Enhanced Thermal Transprt thrugh Sft Glassy Nan-disc Paste Physicchemical Effects in Aging Aqueus Lapnite Suspensins Delayed slidificatin f sft glasses: New experiments, and a theretical challenge Shear Mediated Elngatinal Flw and Yielding in Sft Glassy Materials Delayed Yielding in Creep, Time - Stress Superpsitin and Effective Time Thery fr a Sft Glass Cmplete Reference f Jurnal Jurnal f Chemical Physics, in press Sft Matter, in press. Physical Reviews E, 87 (2013), Langmuir, 28 (2012), Faraday Discussin, 158 (2012), Sft Matter, 8 (2012), Sft Matter, 8,

15 Papers published in (Cnt.) Authr(s) Year Title Cmplete Reference f Jurnal 8 9 A. Shaukat, A. Sharma Y. M. Jshi*, M. Ravi Sankar, V. K. Jain, J. Ramkumar, Y. M. Jshi Squeeze flw behavir f (sft glassy) thixtrpic material Dependence f R-AFF prcess n rhelgical characteristics f sft styrene based rganic plymer abrasive medium Jurnal f Nn- Newtnian Fluid Mech., 167, Jurnal f Manufacturing Technlgy Research, in press 10 A. Shahin Y. M. Jshi* 2012 Hyper-aging dynamics in nan-clay suspensin Langmuir, 28, Rahul Gupta B. Baldewa Y. M. Jshi* S. Kazim, S. Ahmad J. Pfleger, J. Plestil, Y. M. Jshi Time Temperature Superpsitin in Sft Glassy Materials Plyaniline-Sdium Mntmrillnite Clay Nancmpsites: Effect f Clay Cncentratin n Thermal, Structural and Electrical Prperties Sft Matter, 8, Jurnal f Materials Science, 47,

16 External funding Gvernment Agencies DAE (1 cr, DST (45 lac, ) Industries United Phsphrus Ltd. (2 Prjects) Unilever Research (2 Prjects)

17 Present Grup Strength Ph.D.: 8 M. Tech.: 2 BTP Prject: 3 UG interns: 1 There is a vacancy fr up t 2 M.Tech. students

18 Alumni f the grup have jined fllwing cmpanies/institutes Unilever, Shell, Reliance, Tata Research Develpment and Design Center IBM MarketX slitins BHEL ISRO Varius US Universities fr further studies

19 Fr Mre Infrmatin Cntact Ygesh M Jshi, Assciate Prfessr Suthern Labratries 114 Department f Chemical Engineering Tel: Grup Page:

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