Thermal actuation of hydrogels from PNIPAm, alginate, and carbon nanofibres

Authors

Holly Warren, University of WollongongFollow
Marc in het Panhuis, University of WollongongFollow
Geoffrey M. Spinks, University of WollongongFollow
David L. Officer, University of WollongongFollow

RIS ID

117681

Publication Details

Warren, H., in het Panhuis, M., Spinks, G. M. & Officer, D. L. (2018). Thermal actuation of hydrogels from PNIPAm, alginate, and carbon nanofibres. Journal of Polymer Science Part B: Polymer Physics, 56 (1), 46-52.

Abstract

Composite ionic-covalent entanglement (ICE) hydrogel networks were prepared from poly(N-isopropylacrylamide), alginate, and carbon nanofibres. An optimised triple network hydrogel with 86% water content exhibited a compressive strength of 3.0 ± 0.1 MPa and 66 ± 13 mS/cm electrical conductivity. Thermal actuation was shown to have a shorter response time for gels containing nanofibres, compared to those which did not and hydrogel samples more than halved in volume within 1 minute when placed in a 60 °C water bath. Controlled dye release was demonstrated as a potential application and used to further quantify thermal actuation over short times. Joule heating techniques were used to electronically actuate the hydrogel samples, removing the traditional requirements for immersion in a temperature controlled liquid. It is expected that devices based on these materials will find potential applications in soft robotics and micro fluidics.

Grant Number

ARC/CE140100012