Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session A54: Smart and Responsive Polymers and Soft Materials I: Micro-Length Scale Phenomena
8:00 AM–11:00 AM,
Monday, March 4, 2019
BCEC
Room: 254A
Sponsoring
Units:
DPOLY GSOFT DBIO
Chair: Chelsea Davis, Purdue University
Abstract: A54.00012 : Oscillating chemo-mechanical Belousov-Zhabotinsky (BZ) hydrogels*
10:36 AM–10:48 AM
Presenter:
Baptiste Blanc
(Physics, Brandeis University)
Authors:
Baptiste Blanc
(Physics, Brandeis University)
Ning Zhou
(Chemistry, Brandeis University)
Eric Liu
(Chemical and Biological engineering, Tufts University)
S.Ali Aghvami
(Physics, Brandeis University)
Bing Xu
(Chemistry, Brandeis University)
Hyunmin Yi
(Chemical and Biological engineering, Tufts University)
Seth Fraden
(Physics, Brandeis University)
Yoshida [JACS 1996] developed a gel that undergoes cyclic swelling and deswelling without external stimuli. This self-oscillating gel undergoes an oxidation-reduction cyclic reaction, leading to a cyclic change of solubility of the gel. We present a new synthesis technique, offering high modularity in the gel composition and shape. We present simple experimental techniques to characterize the properties of the spherical BZ gels, such as their elasticity, timescale of swelling, density and catalyst content. Moreover, we find that a single spherical BZ gel needs to be larger than a critical size to chemically oscillate, thereby limiting the amplitude of its mechanical oscillation. We finally show how the remarkably high sensitivity of the BZ gel to its chemical environment can be harvested to enhance its actuation.
*We acknowledge financial support from the NSF DMREF-1534890 and the microfluidics facility of the NSF MRSEC DMR-1420382.
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