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Intelligent hydrogel with adjustable colors in full spectral range as well as preparation method and application of intelligent hydrogel
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A hydrogel, full-spectrum technology for smart hydrogel applications
Active Publication Date: 2021-09-10
SICHUAN UNIV
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[0005] Aiming at the problem that the existing color-changing materials cannot realize the color change in the full visible light range, one of the purposes of the present invention is to provide an intelligent hydrogel with adjustable color in the full spectral range and its preparation method, so as to realize the intelligent hydrogel in the full visible spectrum. The color within the range can be adjusted to expand the application range of color-changing materials. The second purpose of the present invention is to provide the application of the intelligent hydrogel
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Embodiment 1
[0061] In this example, to prepare a smart hydrogel with adjustable color in the full spectrum range, the steps are as follows:
[0062] (1) Configure the gel prepolymerization solution
[0064] In the gel prepolymerization solution, the mass ratio of acrylamide to acrylamide dopamine is 100:5, the concentration of acrylamide is 0.25g / mL, the concentration of crosslinking agent is 0.0005g / mL, and the concentration of initiator is 0.0015g / mL mL.
[0065] (2) Preparation of poly(acrylamide-co-acrylamide dopamine) hydrogel
[0066] The gel prepolymerization solution was transferred to a reaction vessel, which was a cylinder made of glass with one end open. Seal the open end ...
Embodiment 2
[0071] This example prepares an intelligent hydrogel with adjustable color in the full spectrum range. The operation is basically the same as in Example 1, except that the poly(acrylamide-co-acrylamide dopamine) hydrogel is immersed in the iron ion solution. Soak for 10min.
Embodiment 3
[0073] This example prepares an intelligent hydrogel with adjustable color in the full spectrum range. The operation is basically the same as in Example 1, except that the poly(acrylamide-co-acrylamide dopamine) hydrogel is immersed in the iron ion solution. Soak for 15min.
[0074] The color change of the smart hydrogel is tested through experiments as follows.
[0075] Prepare a series of N,N-dihydroxyethylglycine buffer solutions with pH gradients (pH = 1 to 13), and place the smart hydrogel prepared in this example in 250 mL of N,N-dihydroxyethylglycine with different pH values. The pH value of the smart hydrogel is the same as that of the N,N-bishydroxyethylglycine buffer solution. The optical photographs of the smart hydrogel prepared in this example under different pH conditions are as follows: figure 2 shown. UV-Vis spectra of smart hydrogels under different pH conditions were measured by UV-Vis spectrophotometer, the results are as follows: image 3 shown.
[00...
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Abstract
The invention provides intelligent hydrogel with adjustable colors in a full spectral range and a preparation method of the intelligent hydrogel. The intelligent hydrogel is prepared from poly(acrylamide-co-acrylamidedopamine) hydrogel and iron ions, wherein the iron ions and hydroxyl groups of catechol groups in the poly(acrylamide-co-acrylamide dopamine) hydrogel form different coordination states under different pH value conditions. The intelligent hydrogel presents different colors under the different coordination states; and when the pH value of an environment where the intelligent hydrogel is located is gradually increased from 1 to 13, the color of the intelligent hydrogel is gradually changed from yellow to red. The invention also provides application of the intelligent hydrogel in preparation of optical filters, ultraviolet light sensors and acidic and alkaline gas sensors. The color of the intelligent hydrogel is adjustable in a full visible spectrum range, so the problem that an existing color-changing material cannot achieve color change in the full visible spectrum range can be solved.
Description
technical field [0001] The invention belongs to the technical field of intelligent hydrogel, and relates to an intelligent hydrogel with adjustable color in the full spectrum range, a preparation method and application thereof. Background technique [0002] Color change is crucial to the evolution and survival of organisms, and it can regulate the relationship between organisms and the environment through signal transmission, camouflage and other forms. Generally speaking, in biological systems, pigmented chromatic and structural chromatic changes are two typical ways of color change. However, compared with structural colors, pigmented colors can achieve angle-independent color observation by adjusting the light absorption of chromophores, and the colors are more uniform. Therefore, the method of using pigments to realize color changes has broad application scenarios in many fields. Many researchers have integrated color-changing chromophores into polymers or inorganic sub...
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