Preparation and preliminary study on application of PNIPAM/Laponite/graphene oxide near-infrared light responsive hydrogel
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    Abstract:

    Laponite as crosslinking agent, graphene oxide (GO) as photothermal conversion reagent, near-infrared light (NIR) responsive hydrogel (Laponite-PNIPAM/GO) was prepared by insitu N-isopropylacrylamide (NIPAM) polymerization. Firstly, the effects of the content of Laponite on the breaking elongation and tensile strength of Laponite-PNIPAM hydrogel were investigated, and the influence of GO content on the mechanical properties of Laponite-PNIPAM/GO hydrogel were investigated to determine the appropriate content of Laponite and GO. Subsequently, thevolume phase transition temperature (VPTT) and NIR responsiveness of the prepared hydrogel were characterized, and the application of Laponite-PNIPAM/GO hydrogel in light-controlled fluid switch and light-controlled desorption was preliminary explored. The results show that: Laponite-PNIPAM/GO hydrogel has high strength and good toughness, the elongation at break can reach over 1100%, and the VPTT of Laponite-PNIPAM/GO hydrogel was about 36 ℃; under NIR irradiation, Laponite-PNIPAM/GO hydrogel can be heated from 20.3 ℃ to 48.5 ℃ within 3 minutes; due to Laponite-PNIPAM/GO hydrogel has temperature sensitivity and photothermal effect, and it has the potential as light-controlled adhesion reagent and fluid switch.

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History
  • Received:November 01,2020
  • Revised:January 29,2021
  • Adopted:February 01,2021
  • Online: March 01,2021
  • Published: