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Preparation method for fluorescent nano-cellulose compound aerogel

A composite aerogel and fluorescent nanotechnology, applied in coatings and other directions, can solve the problems of non-sustainable fluorescent properties of aerogels, loss of luminous efficiency, aggregation of fluorescent components, etc., and achieve good fluorescent effect, good mechanical properties, environmental friendly effect

Inactive Publication Date: 2019-01-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For most fluorescent airgel materials, the fluorescence source components are simply doped and physically combined with the airgel skeleton components, which will lead to the aggregation of fluorescent components and unstable combination, resulting in the loss of luminous efficiency, and the fluorescent properties of airgel does not last

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] The preparation of the used cellulose nanofiber of embodiment:

[0023] Weighing 25g of cotton linters and 1000g of sodium hydroxide solution with a mass fraction of 2% were reacted at room temperature for 12 hours, and the resulting suspension was washed by Buchner funnel suction for several times to neutrality, and then placed in a drying oven Carry out drying treatment; add the dried 10g cotton linters into 500ml distilled water, mash for 5 minutes with a masher, filter the obtained cotton linters and add them to 800ml distilled water again; weigh 0.16g tetramethylpiperidine nitrogen oxide (TEMPO), 1.0g of sodium bromide was dissolved in 80ml of distilled water, and added dropwise to the cotton linters; 51.3g of sodium hypochlorite solution with a mass fraction of 14.5% was weighed, and added dropwise to the cotton linters, at room temperature Under mechanical stirring, the pH value of the reaction system was adjusted and maintained at 10.0 with a mass fraction of 0....

Embodiment 1

[0027] Preparation mass fraction is 100ml of amidated carbon quantum solution of 0.1%, in solution, add 8mgN-hydroxysuccinimide (NHS) and 10mg 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide Hydrochloride (EDC), add the above solution into four 25ml glass bottles in four parts; take four 15mm (diameter) × 17mm (height) cylindrical cellulose nanofiber aerogels and place them in the glass bottles in turn , at room temperature, place the glass bottle on a constant temperature shaker and shake it for 24h. After the reaction, the airgel was taken out, and the washing solution washed with distilled water for many times had no fluorescent effect, and then freeze-dried for 48 hours to obtain the fluorescent nanocellulose composite airgel.

Embodiment 2

[0029] The difference between this embodiment and Example 1 is that the mass fraction ratio of the amidated carbon quantum dot solution in Step 1 is adjusted to 0.2%, and other steps and parameters are kept consistent with Example 1.

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Abstract

The invention discloses a preparation method for a fluorescent nano-cellulose compound aerogel. The preparation method comprises the following steps: taking a cotton linter as a raw material for extracting cellulose nano-fiber; utilizing a TEMPO process to prepare the cellulose nano-fiber with carboxyl on the surface; utilizing a hydro-thermal synthesis process to prepare a carbon quantum dot withamino-functionalized surface; freeze-drying the cellulose nano-fiber, thereby preparing an aerogel; adding the prepared aerogel into an amino-carbon quantum dot solution; adopting a catalyst for catalyzing the chemical grafting of the carbon quantum dot on the surface of the cellulose nano-fiber; and freeze-drying, thereby acquiring a compound fluorescent aerogel material. According to the preparation method disclosed by the invention, the defects of toxicity caused by inorganic compound serving as an aerogel skeleton, discontinuous fluorescence effect of simple physical doping of fluorescentsubstances, and the like, can be overcome; the preparation method is low in cost and is environment-friendly, green and nontoxic; the product has excellent mechanical property and fluorescence effect; the grafting of the carbon quantum dot on the surface of the aerogel material in the form of covalent bond can be realized.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a preparation method of fluorescent nanocellulose composite airgel. Background technique [0002] The nanocellulose extracted from the natural cellulose of biomass materials such as cotton, wood, straw and sea squirt mainly includes two types according to their morphology and physical properties: one is rod-shaped Rigid cellulose nanocrystals, and the other is cellulose nanofibrils with a semi-flexible long-chain structure. Compared with many inorganic nanoparticles, nanocellulose has many outstanding advantages, such as a wide range of sources, low price, high crystallinity and rod-like morphology, high specific surface area and rigid modulus, low toxicity, biodegradability, good biological compatibility etc. Among them, cellulose nanofibers with a semi-flexible long-chain structure have an ultra-high aspect ratio, and their elastic modulus is as high as 100Gpa, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/36C08L1/04
CPCC08J9/36C08J2205/026C08J2301/04
Inventor 林宁吴博浪
Owner WUHAN UNIV OF TECH
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