Abstract
This study involved the preparation of a sol–gel-based silica hydrogel, which incorporates uniformly dispersed graphene oxide (GO), using an acid/base combinatorial catalyst system. The gelation time of the silica hydrogel was dramatically reduced by adding the combinatorial catalyst instead of using a single catalyst system. Raman mapping confirmed that the combinatorial catalyst system considerably improved the uniformity of GO dispersion in the silica matrix. The silica/GO composite hydrogel demonstrated a very wide range of elastic moduli, compressive strength, and strain at fracture, indicating that this composite hydrogel system could potentially be used as a platform for stem cell culture or as a stretchable gel.
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