Start
Nov 27, 2018 - 11:30
End
Nov 27, 2018 - 12:30
Venue
Room No. 240 first floor next to Chem. Engg. deptl. office
Event Type
Speaker
Prof. Animangsu Ghatak IIT Kanpur
Title
Estimation of solid-liquid interfacial tension using curved surface of a soft solid
Abstract: Unlike liquids for crystalline solids the surface tension is known to be different from the surface energy. However the same can’t be said conclusively for amorphous materials like soft crosslinked elastomers. In order to resolve this issue we have developed a direct method for measuring solid-liquid interfacial tension by using curved surface of a solid. In essence we have used the inner surface of tiny cylindrical channels embedded inside a soft elastomeric film for sensing the effect of the interfacial tension. When a liquid is inserted into the channel because of wetting induced alteration in interfacial tension its thin wall deflects; the deflection is measured with an optical profilometer and is analyzed using the Föppl–von Kármán equation. We have used several liquids and crosslinked poly(dimethylsiloxane) as the solid to show that the estimated values of the solid-liquid interfacial tension matches with the corresponding solid-liquid interfacial energy reasonably well.Bio: Prof Animangsu Ghatak is currently the head of Chemical Engineering at IIT Kanpur. Prof Ghatak Ghatak obtained his BTech degree from IIT Kharagpur and MTech from IIT Kanpur. He received his PhD from the Lehigh University and conducted post-doctoral research at Cambridge University UK & Harvard University USA..