Photolatently modulable hydrogels using unilamellar titania nanosheets as photocatalytic crosslinkers

Mingjie Liu, Yasuhiro Ishida (), Yasuo Ebina, Takayoshi Sasaki and Takuzo Aida ()
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Mingjie Liu: RIKEN Center for Emergent Matter Science
Yasuhiro Ishida: RIKEN Center for Emergent Matter Science
Yasuo Ebina: National Institute for Materials Science, International Center for Materials Nanoarchitectonics
Takayoshi Sasaki: National Institute for Materials Science, International Center for Materials Nanoarchitectonics
Takuzo Aida: RIKEN Center for Emergent Matter Science

Nature Communications, 2013, vol. 4, issue 1, 1-7

Abstract: Abstract Hydrogels, postmodulable in controlled time and space domains, attract particular attention due to their potential in bio-related applications. Towards this goal, photolatently reactive hydrogels are very promising. Here we develop photolatently modulable hydrogels, composed of a polymer network accommodating photocatalytic titania nanosheets at every crosslinking point. As titania nanosheets can utilize gelling water as their source of radicals, its long-lasting photocatalysis makes the hydrogels readily modulable. Benefiting from the hydrogelation mechanism, the gel network is finely compartmentalized, leading to sharp thermoresponses. As demonstrated by photo-micropatterning, non-diffusible titania nanosheets at the crosslinking points enable pointwise modulations with an excellent spatial resolution. The photolatent nature also makes it possible to conjugate them with other hydrogels and polymers.

Date: 2013
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DOI: 10.1038/ncomms3029

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