NDLI: Analysis of pH and electrically controlled swelling of hydrogel-based micro-sensors/actuators

Content Provider	Springer Nature Link
Author	Yew, Y. K. Ng, T. Y. Li, Hua Lam, K. Y.
Copyright Year	2007
Abstract	In this paper, we carry out the theoretical electro-chemo-mechanical investigation into water swollen ionic polymer gels under the simultaneous influence of electrical and chemical stimuli. In addition to these hydrogels being deployed as active sensing/actuating elements in MEMS/BioMEMS devices, this work can also serve as the basis of illustrating synthetic analogs of physiological muscles with possible applications in orthotics, prosthetics, and as artificial muscles. An electro-chemo-mechanical model or Multi-Effect-Coupling of pH Stimulus (MECpH) model, which was developed earlier by the present authors, is significantly extended to handle nonlinear deformation and implemented numerically to simulate the deformation characteristics of the pH-stimulus responsive hydrogel under the application of an externally applied voltage in different buffered pH solutions. The nonlinear deformation theory provides more accurate results especially when the deformations are large. The hydrogel is observed to experience swelling and bending when pH and external electric field stimuli coexist. The mode and degree of deformation are found to be highly dependent on changes of environmental pH, external electrical potential and bathing ionic strength. As an anionic hydrogel is considered in the simulation, it shows larger changes in deformation characteristic in basic than in acidic solutions. More importantly, the average curvatures of the swollen hydrogel are found to be a linear function with the applied electric potential, making the hydrogel an ideal actuator. However, we also note a significant decrease in the swelling equilibrium degree as the ionic strength becomes concentrated.
Starting Page	487
Ending Page	499
Page Count	13
File Format	PDF
ISSN	13872176
Journal	Biomedical Microdevices
Volume Number	9
Issue Number	4
e-ISSN	15728781
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2007-05-23
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	pH-Sensitive hydrogel Electric field stimulus MECpH model Nonlinear deformation MEMS/BioMEMS Engineering Fluid Dynamics Nanotechnology Biophysics/Biomedical Physics Biomedical Engineering
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Molecular Biology Biomedical Engineering

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