Luminescent fibre hydrogel and preparation method thereof

A cellulose hydrogel and cellulose technology, applied in the field of luminescent cellulose hydrogel and its preparation, can solve the problems of poor biodegradability, production and application limitations of synthetic polymer hydrogels, and achieve easy recycling The effect of recycling, simple and convenient operation and low price

Inactive Publication Date: 2009-05-06
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor biodegradability of synthetic polymer hydrogels, its production and application are greatly limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] With 0.4 gram of cellulose (viscosity average molecular weight Mη=3.5 * 10 4 ) dispersed in 9.6 grams of mixed aqueous solution containing 6wt% NaOH and 4wt% urea, pre-cooled to -20 to -10°C, thawed and stirred after 5 to 24 hours to obtain a transparent cellulose solution with a concentration of 2wt%. Mix 100 μl of CdSe / ZnS quantum dots with a carboxyl group on the surface with a concentration of 17.9 μM and a size of 3.4 nm with the cellulose solution, then add 1 ml of epichlorohydrin dropwise to the mixed solution, and heat up to the gel temperature of 60 °C , after 0.5 hours, a cellulose hydrogel emitting red light under an ultraviolet lamp was obtained. The formed luminescent cellulose hydrogel was washed repeatedly with distilled water to remove residual NaOH, urea and cross-linking agent epichlorohydrin.

Embodiment 2

[0011] With 0.3 gram of cellulose (viscosity average molecular weight M η =3.5×10 4 ) dispersed in 9.7 grams of mixed aqueous solution containing 8wt% NaOH and 10wt% urea, pre-cooled to -20 to -10°C, thawed and stirred after 5 to 24 hours to obtain a transparent cellulose solution with a concentration of 3wt%. Mix 100μl of quantum dots with a concentration of 10.8μM and a size of 3nm with the cellulose solution evenly, add 0.8ml of epichlorohydrin dropwise to the mixed solution, raise the temperature to a gel temperature of 50°C, and obtain a gel after 2 hours. Cellulose hydrogel that emits yellow-green light. The formed luminescent cellulose hydrogel was washed repeatedly with distilled water to remove residual NaOH, urea and cross-linking agent epichlorohydrin. The CdSe / ZnS quantum dots used are core-shell structures with carboxylated surfaces and negative charges.

Embodiment 3

[0013] With 0.2 gram of cellulose (viscosity average molecular weight M η =3.5×10 4 ) dispersed in 9.8 grams of mixed aqueous solution containing 6wt% NaOH and 4wt% urea, pre-cooled to -20 to -10°C, thawed and stirred after 5 to 24 hours to obtain a transparent cellulose solution with a concentration of 2wt%. Mix 100 μl of quantum dots with a concentration of 29.12 μM and a size of 3.1 nm with the cellulose solution evenly. 0.5 ml of epichlorohydrin was added dropwise into the mixed solution, and the temperature was raised to 30° C. After 12 hours, a cellulose hydrogel emitting yellow light under an ultraviolet lamp was obtained. The formed luminescent cellulose hydrogel was washed repeatedly with distilled water to remove residual NaOH, urea and cross-linking agent epichlorohydrin.

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Abstract

The invention relates to a luminescent cellulose hydrogel and a preparation method thereof. The preparation method for the luminescent cellulose hydrogel is as follows: firstly, cellulose is dissolved in an aqueous solution of NaOH / urea to obtain a NaOH / urea combined aqueous solution which is dissolved with the cellulose, wherein the mass percent concentration of NaOH is between 6 and 10 percent, the mass percent concentration of urea is between 4 and 12, and the mass percent concentration of the cellulose in the combined aqueous solution is between 1 and 6 percent; secondly, CdSe / ZnS quantum dots the surfaces of which are provided with carboxyl groups are added into the combined aqueous solution, wherein a mol ratio of the cellulose to the quantum dots is between 10 to 1 and 1,000 to 1, the dimension of the CdSe / ZnS quantum dots is between 2 and 7 nanometers, and the concentration of the CdSe / ZnS quantum dots is between 0.1 and 200 mu M; and thirdly, a crosslinking agent - epichlorohydrin with required amount is added into the combined aqueous solution, and the combined aqueous solution is subjected to chemical crosslinking reaction and placed at a gel temperature until the luminescent cellulose hydrogel is formed. The luminescent cellulose hydrogel can be widely applied in the fields of optical elements, biomedicine, control and release of medicines, etc.

Description

technical field [0001] The invention relates to a luminescent cellulose hydrogel and a preparation method thereof, belonging to the field of polymer materials. Background technique [0002] Plant cellulose is the most abundant renewable resource on earth, and cellulose materials can be decomposed by microorganisms after being discarded, which is an environmentally friendly material. No use or generation of harmful substances, and the use of renewable resources to produce environmentally friendly materials is a frontier field in the world today. Recently, the preparation and application of hydrogels have developed rapidly, and many advantages such as water absorption, environmental sensitivity, water retention, and biocompatibility have attracted much attention, especially the preparation of quantum dot-based luminescent hydrogels. extensive attention of researchers. However, the current luminescent hydrogels have only been reported based on synthetic polymers, and no repor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08L1/02C08K9/04C08B15/10
Inventor 张俐娜常春雨
Owner WUHAN UNIV
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