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Title: A multiphysics model of photo-sensitive hydrogels in response to light-thermo-pH-salt coupled stimuli for biomedical applications
Authors: Chen, Xiao
Li, Hua
Lam, King-Yeung
Keywords: Engineering::Mechanical engineering
Issue Date: 2020
Source: Chen, X., Li, H. & Lam, K. (2020). A multiphysics model of photo-sensitive hydrogels in response to light-thermo-pH-salt coupled stimuli for biomedical applications. Bioelectrochemistry, 135, 107584-.
Journal: Bioelectrochemistry
Abstract: This paper aims to unveil the fundamental response mechanism of photo-sensitive hydrogels subject to light-thermo-pH-salt coupled stimuli, for their potential biomedical uses such as cell scaffolds and extracellular matrices, where biological activity largely depends on internal electrochemical changes. To mimic the microenvironment of biomolecules or cells, we focus on a spirobenzopyran-modified N-isopropylacrylamide hydrogel incorporating acrylic acid as a proton generator and develop a multiphysics model to characterize its behaviour within aqueous solution in response to light intensity, temperature, buffer pH, and salt concentration. The model allows for concurrent chemical reactions, ionic diffusion, electrostatic effects and large mechanical deformation, as well as interaction with the solution domain. Validation was performed by comparison with the published experimental results and showed good agreement. It is demonstrated by the simulation results that the photo-sensitive hydrogel exhibits a varied sensitivity to the external stimuli if incorporated with different molar ratios of acrylic acid. The electrical and pH response characteristics of the hydrogel, especially those in neutral solution, may inspire some potential biomedical applications, such as photo-controlled drug release and cell growth.
ISSN: 1567-5394
DOI: 10.1016/j.bioelechem.2020.107584
Schools: School of Mechanical and Aerospace Engineering 
Rights: © 2020 Elsevier B.V. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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