Preparation method and application of a photothermal conversion hydrogel

Abstract

The invention belongs to the field of polymer composite functional materials, and discloses a method for preparing a photothermal conversion hydrogel, comprising the following steps: (1) dispersing molybdenum dioxide in water to prepare a molybdenum dioxide dispersion; (2) dissolving Dissolve hectorite in water, then add the molybdenum dioxide dispersion in step (1), mix well to obtain a mixed solution; (3) dissolve N-isopropylacrylamide in step ( 2) into the mixed solution, then add the initiator, cross-linking agent and co-initiator, mix well to obtain the mixed pre-polymerization liquid; (4) inject the mixed pre-polymerization liquid in step (3) into the mold, and react at room temperature for 24 hours , to obtain a hydrogel. The hydrogel prepared by the present invention has remarkable light-to-heat conversion effect, good light transmittance and mechanical properties, and excellent stability in heating and cooling cycles. There is great application potential in other fields.

Description

technical field [0001] The invention relates to the field of polymer composite functional materials, in particular to a preparation method and application of a photothermal conversion hydrogel. Background technique [0002] As one of the smart hydrogels, light-responsive hydrogels have a controllable and intelligent effect mainly through the induction of light irradiation, and there is no direct physical contact with external factors. This feature makes light-responsive hydrogels. Glues have been extensively studied in the fields of soft robotics, sensors, microdevices, and drug delivery. [0003] Since the intensity, time and location of NIR light irradiation can be easily controlled artificially, NIR light is considered as an ideal light source to trigger the photoresponsive behavior of hydrogels. Composite hydrogels prepared by combining heat-sensitive poly-N-isopropylacrylamide hydrogels with near-infrared photothermal conversion fillers such as graphene oxide, carbon n...

AI Technical Summary

Problems solved by technology

However, carbon-based nanomaterials have poor dispersion in hydrogel systems, noble metal nanomaterials are expensive to prepare and have certain cytotoxicity, and transition metal halogenated photothermal materials have poor chemical stability and are easily destroyed under high temperature or repeated laser irradiation conditions. Oxidation hinders its practical application

In addition, the transparency of the composite hydrogel prepared by the incorporation of traditional photothermal fillers is extremely poor, and it is completely black or too dark to be completely opaque, which cannot be applied in the field of visualization.

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