Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session N33: Microscopic Self-Assembly II
11:30 AM–1:54 PM,
Wednesday, March 8, 2023
Room: Room 225
Sponsoring
Unit:
DSOFT
Chair: Tine Curk, Johns Hopkins University
Abstract: N33.00005 : Tunable colloids with dipolar and depletion interactions: towards field-switchable crystals and gels.*
12:18 PM–12:30 PM
Presenter:
Anand Yethiraj
(Memorial University)
Author:
Anand Yethiraj
(Memorial University)
In this work, we report on confocal microscopy experiments [1] that employ an electric field to provide fine, tunable control over depletion gels by inducing anisotropic dipolar interactions which can be controlled in amplitude or switched on and off. This dual control also leads to the curious case where depletion interactions, at low polymer concentrations, can increase dipolar order, while stronger depletion interactions can increase disorder thereby introducing novel gel states. With these “dipolar-depletion” gels, we examine the onset of irreversibility and find strategies to accelerate aging.
[1] Shivani Semwal, Cassandra Clowe-Coish, Ivan Saika-Voivod, Anand Yethiraj, “Tunable colloids with dipolar and depletion interactions: towards field-switchable crystals and gels.”, Physical Review X, accepted for publication (2022).
*This research was funded by the National Science and Engineering Research Council of Canada (NSERC).
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