Issue 11, 2012

Preparation and characterization of pH- and temperature-responsive hydrogels with surface-functionalized graphene oxide as the crosslinker

Abstract

A methodology is described for the preparation of pH- and temperature-responsive semi-interpenetrating hydrogels with surface-functionalized graphene oxide (GO) as the crosslinker, N-isopropylacrylamide (NIPAM) as the monomer and sodium alginate (SA) as an additive. GO sheets were first prepared via an oxidation reaction in aqueous solution and then modified with 3-(trimethoxysilyl)propylmethacrylate (TMSPMA) via a silanization reaction. Free-radical polymerization of NIPAM and SA was then carried out with the presence of TMSPMA-modified GO sheets at 20 °C in a water bath, leading to the formation of pH- and temperature-responsive PNIPAM/SA/GO hydrogels crosslinked with TMSPMA-modified GO sheets. The effects of TMSPMA-modified GO sheets content on various physical properties were investigated. Results show that PNIPAM/SA/GO hydrogels undergo a large volumetric change in response to temperature. It also exhibits significantly larger water uptake compared to conventional PNIPAM/SA hydrogels. Moreover, the PNIPAM/SA/GO hydrogels have a much better mechanical properties than the conventional PNIPAM/SA hydrogels.

Graphical abstract: Preparation and characterization of pH- and temperature-responsive hydrogels with surface-functionalized graphene oxide as the crosslinker

Supplementary files

Article information

Article type
Paper
Submitted
21 Oct 2011
Accepted
05 Jan 2012
First published
06 Feb 2012

Soft Matter, 2012,8, 3139-3145

Preparation and characterization of pH- and temperature-responsive hydrogels with surface-functionalized graphene oxide as the crosslinker

Z. Li, J. Shen, H. Ma, X. Lu, M. Shi, N. Li and M. Ye, Soft Matter, 2012, 8, 3139 DOI: 10.1039/C2SM07012J

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