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Download fileThermal-/Light-Tunable Hydrogels Showing Reversible Widening and Closing Actuations Based on Predesigned Interpenetrated Networks
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posted on 2022-02-08, 22:30 authored by Chun-Yen Liu, Chien-Hsiang Chang, Thanh Tran Thi, Guan-Yi Wu, Chia-Ming Tu, Hung-Yi ChenPoly(N-isopropylacrylamide)
(PNIPAM) is a well-known
biocompatible temperature-sensitive polymer. To enhance the biocompatibility
of the artificial iris developed in our previous work, in this study,
we demonstrate the syntheses of a series of cross-linked and interpenetrated
poly(NIPAM-co-AM) hydrogel networks. Elasticities
and mechanical properties of the synthesized hydrogels were investigated.
Based on the results, the N3A1–N3A1 interpenetrated network
(IPN) hydrogel was selected as a functional material for the fabrication
of thermally tunable and light-tunable iris-like actuators. Fabrication
of both gradient- and double-layer hydrogels was also carried out.
Thermally responsive curling of the synthesized hydrogels was studied.
Fabrication of thermal-/light-tunable IPN hydrogels showing actuation
of widening and closing was achieved. The synthesized iris-like IPN
hydrogels were further coated with polydopamine to promote light sensitivity.
Both thermally sensitive actuation and light-sensitive actuation of
widening and closing were demonstrated for the fabricated iris-like
hydrogels. Stimulated variations in the inner diameter and the outer
diameter surrounding the iris-like hydrogels were estimated. The results
showed that poly(NIPAM-co-AM) IPN hydrogels are available
for the design of thermal-/light-responsive actuators.
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known biocompatible temperatureouter diameter surroundingthermal -/ lightpromote light sensitivitythermally responsive curlingartificial iris developedthermally sensitive actuationclosing actuations basedlike ipn hydrogelssensitive actuationthermally tunablelike hydrogelsresponsive actuatorsinner diametersensitive polymerlike actuatorssynthesized hydrogelslayer hydrogelsipn hydrogelstunable irissynthesized irisstimulated variationsprevious workn mechanical propertiesfunctional materialfabricated irisco also carried