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Preparation method and application of carbon quantum dot/chitosan derivative hydrogel with light-stress dual response

A technology of chitosan derivatives and carbon quantum dots, applied in chemical instruments and methods, luminescent materials, nano optics, etc., can solve the problems of high mechanical mismatch, poor biocompatibility, and low conductivity, and achieve excellent Good mechanical properties, good electrical conductivity, and excellent optical properties

Active Publication Date: 2022-01-04
ZHONGBEI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the selection of fillers that endow hydrogels with optical properties is very important. The main fillers currently used are azobenzenes, but the defects of these fillers are poor biocompatibility, low electrical conductivity, or mechanical properties with hydrogels. high mismatch

Method used

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  • Preparation method and application of carbon quantum dot/chitosan derivative hydrogel with light-stress dual response
  • Preparation method and application of carbon quantum dot/chitosan derivative hydrogel with light-stress dual response
  • Preparation method and application of carbon quantum dot/chitosan derivative hydrogel with light-stress dual response

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preparation example Construction

[0037] The invention provides a kind of preparation method of carbon quantum dot / chitosan derivative hydrogel, comprising the following steps:

[0038] (1) Preparation of carbon quantum dot solution

[0039] Mix o-phenylenediamine and urea in water evenly, heat at 160°C for 5 hours, and cool to room temperature to obtain a carbon quantum dot solution;

[0040] (2) Preparation of cross-linked chitosan quaternary ammonium salt solution

[0041] Drop the sodium hydroxide solution into the chitosan quaternary ammonium salt solution and keep stirring until the pH value reaches 10. When heated to 70°C, add the crosslinking agent epichlorohydrin to react, and continuously add the sodium hydroxide solution dropwise during the reaction Keeping the pH of the reaction system at 10, reacting at a constant temperature for 4 hours, cooling to room temperature naturally, adjusting the pH value to 7 with hydrochloric acid solution, adding glycerol to obtain a cross-linked chitosan quaternary...

Embodiment 1

[0058] The chemical substance materials used in this embodiment are: chitosan quaternary ammonium salt, epichlorohydrin, sodium hydroxide, hydrochloric acid, glycerol, o-phenylenediamine, urea, deionized water, and quality purity and precision control . The combined dosage is as follows: in grams, milliliters, millimeters, centimeters 3 is the unit of measurement. The chemical substances and materials used in other embodiments are the same as in this embodiment unless otherwise specified.

[0059] Chitosan quaternary ammonium salt: HACC solid solid 99.5% 2.0g±0.001g

[0060] Epichlorohydrin: C 3 h 5 ClO liquid liquid 99.5% 4mL±0.001mL

[0061] Sodium hydroxide: NaOH solid solid 99.5% 5g±0.001g

[0062] Hydrochloric acid: HCl liquid liquid 99.5% 23mL±0.001mL

[0063] Glycerol: C 3 h 8 o 3 Liquid liquid 99.5% 1mL±0.001mL

[0064] o-Phenylenediamine: C 6 h 8 N 2 Solid solid 98% 0.1g±0.001g

[0065] Urea: CH 4 N 2 O solid solid 99% 0.5g±0.001g

[0066] Deionize...

Embodiment 2

[0097] The preparation method of nitrogen-doped carbon quantum dot / chitosan derivative hydrogel comprises the following steps:

[0098] (1) Preparation of nitrogen-doped carbon quantum dots / cross-linked chitosan quaternary ammonium hydrogel precursor

[0099] Accurately weigh 0.1 g of o-phenylenediamine and 0.5 g of urea with an electronic balance, dissolve in 16 ml of deionized water, stir at 30°C for 20 min, and sonicate for 10 min. The system was transferred to a 100ml stainless steel autoclave lined with polytetrafluoroethylene, and heated at 160°C for 5h. After cooling to room temperature, take it out, put the obtained carbon quantum dot solution into a 500D dialysis bag, use deionized water as the medium for dialysis for 12 hours, and change the water every 2 hours. During the dialysis process, it can be clearly seen that the color of the dialysate prolongs with time Gradually changed from yellow to colorless, and the dialysate was colorless and transparent after 12 hou...

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Abstract

The invention relates to a preparation method and application of carbon quantum dot / chitosan derivative hydrogel with light-stress dual response. The preparation method comprises the following steps of: well mixing o-phenylenediamine and urea in water, and heating to obtain a carbon quantum dot solution; dropwise adding a sodium hydroxide solution into a chitosan quaternary ammonium salt aqueous solution, continuously stirring until the pH value is 10, heating to 70 DEG C, adding epichlorohydrin as a cross-linking agent for reaction, and adding glycerol to obtain a cross-linked chitosan quaternary ammonium salt mixed solution; and adding the carbon quantum dot solution into the cross-linked chitosan quaternary ammonium salt mixed solution to form a cross-linked chitosan quaternary ammonium salt / carbon quantum dot mixed solution, and heating for gel forming to obtain the carbon quantum dot / chitosan derivative hydrogel. Carbon quantum dots with excellent mechanical properties, good electrical conductivity and excellent optical properties are used as a photoelectric filler, and a carbon quantum dot network and a cross-linked chitosan quaternary ammonium salt gel network are subjected to synergistic response through a stirring effect to construct the light-stress dual-response polymer hydrogel.

Description

technical field [0001] The invention relates to the field of photoelectric hydrogel preparation, in particular to a preparation method and application of a carbon quantum dot / chitosan derivative hydrogel with dual responses to light and stress. Background technique [0002] Hydrogel is a kind of polymer material with hydrophilic three-dimensional network cross-linked structure. Hydrogel exists in nature itself. At this stage, people can also synthesize hydrogel by chemical methods. Hydrogels have become a research hotspot in many fields because of their excellent water absorption, good mechanical properties and self-healing properties. Cross-linked chitosan quaternary ammonium salt is just such a new type of polymer material. It is prepared by cross-linking chitosan quaternary ammonium salt. It is generally prepared by chemical cross-linking method. Compared with general synthetic materials, it has low toxicity. , good biocompatibility and other characteristics, it is known...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08L5/08C08K3/04C09K11/02C09K11/65B82Y20/00B82Y30/00B82Y40/00
CPCC08J3/075C09K11/02C09K11/65B82Y20/00B82Y30/00B82Y40/00C08J2305/08C08K3/04
Inventor 李洁魏晓童胡智锐王晨韩晶李迎春王文生
Owner ZHONGBEI UNIV
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