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Issue 20, 2017
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Stimuli-responsive hydrogel microfibers with controlled anisotropic shrinkage and cross-sectional geometries

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Abstract

Stimuli-responsive microfibers are fabricated by extruding mixed solutions of poly(N-isopropylacrylamide-co-acrylic acid) (pNIPAM-AAc) and sodium alginate (Na-alginate) using a microfluidic spinning system. The fabricated microfibers shrink and swell with temperature and/or pH. By controlling the extruded laminar flow, microfibers capable of anisotropic shrinkage are fabricated. Cross-sectional microscale geometries of microfibers, including double layering and hollowness, are successfully controlled by patterning the laminar flow during microfiber formation, resulting in hydrogels capable of folding/unfolding motions and fluid pumping. In addition, macroscopic 3D-bundle structures are assembled with these microfibers. We believe that our microfibers can be applied to various applications such as soft actuators, soft robots, and micropumps.

Graphical abstract: Stimuli-responsive hydrogel microfibers with controlled anisotropic shrinkage and cross-sectional geometries

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Supplementary files

Article information


Submitted
09 Feb 2017
Accepted
10 Apr 2017
First published
24 Apr 2017

Soft Matter, 2017,13, 3710-3719
Article type
Paper

Stimuli-responsive hydrogel microfibers with controlled anisotropic shrinkage and cross-sectional geometries

S. Nakajima, R. Kawano and H. Onoe, Soft Matter, 2017, 13, 3710
DOI: 10.1039/C7SM00279C

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