Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session S58: Soft Interface Mechanics II
11:15 AM–2:03 PM,
Thursday, March 7, 2019
BCEC
Room: 257A
Sponsoring
Units:
GSOFT DPOLY GSNP DBIO
Chair: Ryan McGorty, Univ of San Diego
Abstract: S58.00004 : Effects of Bidisperse Wettability on Interfacial Viscoelasticity of Particle Laden Interfaces*
11:51 AM–12:03 PM
Presenter:
Gordon Christopher
(Texas Tech University)
Authors:
Syed Ehsanur Rahman
(Texas Tech University)
Gordon Christopher
(Texas Tech University)
In this work, the effects of controlled dispersity of wettability on particle laden interfaces is examined. Using hydrophobic and hydrophilic negative polystyrene and hydrophobic non-ionic polystyrene, mixed wettability systems with varying ratios of hydrophobic to hydrophilic particles are studied. An increase in interfacial elasticity is observed when the ratio of hydrophobic to hydrophilic particles reaches 1. This corresponds with an increase in local hexagonal order and decrease in area around particles. Similar but smaller magnitude changes are observed for combinations of hydrophobic particles. We believe these changes occur due partitioning of particles to either side of the interface, creating larger local density and increased resistance to deformation.
*NSF #1437710
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