Dr. Arun G. Banpurkar's Talk

Aug 25, 2016 - 17:00

Aug 25, 2016 - 18:00

Room 118 Chemical Engineering

Seminars

Dr. Arun G. Banpurkar Department of Physics Savitribai Phule Pune University.

Abstract: Electrowetting (EW) on dielectric is one of the most convenient techniques accepted for manipulation of liquid droplets in micro-fluidic chips as also in adaptive optics and POC devices. The external voltage brings electric charge density at a liquid-solid interface which results in changing of wetting angle as a function of voltage magnitude. In normal circumstances a water-hydrophobic polymer shows formation of electric double layer (EDL) due to preferential adsorption of water ions at liquid-solid interface. It is believed that it has negligible effect on total capacitance in electrowetting system. Despite this fact charge trapping related modification in EW contact angle modulation is seen on water-aged hydrophobic surfaces. So far the charge trapping can be controlled by means of suitable voltage bias in EW. Also effect of water-ion contact on hydrophobic surface may lead to electro-hydrodynamic instability induced nano-structuration which is not yet fully understood. References: 1. Spontaneous electrification of fluoropolymer surfaces in contact with aqueous electrolytes probed by DC electrowetting Arun G. Banpurkar Yogesh Sawane Sandip M. Wadhai C. U. Murade Igor Saretanu D. van den Ende and F. Mugele (in comm.) 2. Hysteretic DC electrowetting by field-induced nano-structurations on polystyrene films Yogesh B. Sawane Suwarna Datar Satishchandra B. Ogale and Arun G. Banpurkar Soft Matter 11 2655 (2015) 3. Electrically Tunable Wetting Defects Characterized by a Simple Capillary Force Sensor Dieter ’t Mannetje Arun Banpurkar Helmer Koppelman Michel H. G. Duits Dirk van den Ende and Frieder Mugele Langmuir 29 9944 (2013) 4. Electrowetting-Based Microdrop Tensiometer Arun G. Banpurkar Kevin P. Nichols and Frieder Mugele Langmuir 24 10549 (2008)Short biography: Dr. Arun Banpurkar is currently an Assistant Professor at the Physics Dept. of Pune university. He is also a visiting scientist at PCF University of Twente Netherlands. Dr. Banpurkar's basic education has been in Physics all along from bachelors to doctoral studies. He got BOYSCAST fellowship from DST in 2007-08. He has different national and international research collaborations and forty international journal papers. Dr. Banpurkar's research interest is in soft condensed matter - specifically in problems involving wetting and spreading electrowetting microfluidics and on experimental studies in pattern formation in Hele-Shaw flows and growth models. (Attendance compulsory for CL702 students)