Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session E55: Smart Responsive Polymers I
8:00 AM–11:00 AM,
Tuesday, March 6, 2018
LACC Room: 515A
Sponsoring Unit: DPOLY
Chair: Mark Stevens, Sandia Natl Labs
Abstract: E55.00003 : Concurrent reaction and diffusion in photo-responsive hydrogels*
9:00 AM–9:12 AM
A hydrogel consists of a polymer network imbibing a solvent. It can undergo large deformation like a soft solid originating from the polymer network underpinned by the crosslinks, as well as exchange matter with the environment like a porous medium. Hydrogels with guest species undergoing a photoisomerization reaction can respond to light in the form of a volumetric change due to the different hydrophobicity of the photoisomers. In this work, we have combined hydrogel elasticity with chemical reaction under the framework of non-equilibrium thermodynamics to study the response kinetics of the photo-responsive hydrogels. As a result, the kinetic behavior of the photo-responsive hydrogels is governed by both the reaction of the photoisomerization and the diffusion of the solvent molecules. Our model allows us to investigate different kinetic processes in photo-responsive hydrogels, including reaction-limited, diffusion-limited, and coupled reaction-diffusion processes.
*startup fund from UCLA Henry Samueli School of Engineering and Applied Science, Haythornthwaite Foundation for the Haythornthwaite Research Initiation Grants.
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