Preparation method and application of photo-thermal conversion hydrogel

Abstract

The invention belongs to the field of polymer composite functional materials, and discloses a preparation method of photothermal conversion hydrogel, which comprises the following steps: (1) dispersing molybdenum dioxide in water to prepare a molybdenum dioxide dispersion liquid; (2) dissolving hectorite in water, then adding the molybdenum dioxide dispersion liquid obtained in the step (1), and uniformly mixing to obtain a mixed solution; (3) dissolving N-isopropylacrylamide in the mixed solution obtained in the step (2) in an ice bath and nitrogen atmosphere, then adding an initiator, a cross-linking agent and a co-initiator, and uniformly mixing to obtain a mixed prepolymer solution; and (4) injecting the mixed prepolymer solution obtained in the step (3) into a mold, and reacting at room temperature for 24 hours to obtain the hydrogel. The hydrogel prepared by the invention has a remarkable photothermal conversion effect, good light transmission and mechanical properties and excellent heating and cooling cycling stability, and has huge application potential in the fields of intelligent hydrogel drivers, remote light-operated micro-flow valves, photothermal physiotherapy sheets and the like.

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 a kind of smart hydrogel, photoresponsive hydrogel can be regulated and intelligent mainly through the induction of light irradiation, and there is no direct physical contact with external factors. This feature makes photoresponsive hydrogel Glue has been extensively studied in the fields of soft robotics, sensors, microdevices, and drug release. [0003] Since the intensity, time, and location of near-infrared light irradiation can be easily controlled artificially, near-infrared light is considered to be an ideal light source to trigger the photoresponsive behavior of hydrogels. Composite hydrogels prepared by combining heat-sensitive poly-N-isopropylacrylamide hydrogel with graphene oxide, carbon nanotubes, ferric oxide nanoparticles, gold nanorods...

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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