A long afterglow luminescent airgel and its preparation method

A long afterglow luminescence and aerogel technology, applied in luminescent materials, chemical instruments and methods, etc., can solve the problems of high cost and poor dispersion, and achieve the effects of good uniformity, enhanced skeleton, and controllable sample density.

Active Publication Date: 2021-06-04
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing preparation method uses citric acid as a metal complexing agent to prepare long afterglow materials, which has poor dispersibility and high cost

Method used

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  • A long afterglow luminescent airgel and its preparation method
  • A long afterglow luminescent airgel and its preparation method
  • A long afterglow luminescent airgel and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 2.98g zinc nitrate [Zn(NO 3 ) 2 ·6H 2 O] and 2.56g gallium nitrate [Ga(NO 3 ) 3 ·xH 2 O] was dissolved in 30 ml of ethanol, stirred evenly, then added 0.03 g of chromium nitrate [Cr(NO 3 ) 3 9H 2 O] Stir until the solution is homogeneous. Add 2ml of deionized water and 2.31ml of polyacrylic acid (PAA) to the mixed solution, stir at room temperature for 30 minutes, then add 3.78ml of propylene oxide (PO), and leave it at room temperature until it gels after 3 minutes. Spread a layer of ethanol on the upper surface of the obtained wet gel for aging. After three days, replace the ethanol solvent at room temperature, 8-12 hours each time, replace 3-5 times, and then perform supercritical carbon dioxide drying to reach the supercritical condition. With a temperature of 40°C and a pressure of 9MPa, ZnGa was obtained after drying 2 o 4 :Cr 3+ airgel. The airgel was calcined in a muffle furnace at 800°C for 2 hours to obtain ZnGa 2 o 4 :Cr 3+ Long-lasting glowing...

Embodiment 2

[0036] Adopt the same preparation method as Example 1, the difference is that the preparation conditions used are different, specifically comprising the following steps:

[0037] (1) Dissolve 0.01mol zinc nitrate hexahydrate, 0.01mol gallium nitrate hydrate and 0.00005mol chromium nitrate nonahydrate in ethanol, mix well, then add 0.1mol deionized water and 0.03mol polyacrylic acid, stir at 300r / min Down stirring 30min, obtain mixed solution;

[0038] (2) Add 0.0067mol propylene oxide to the mixed solution, stir for 30min at a stirring rate of 300r / min, and then let it stand until it turns into a gel;

[0039] (3) Cover the surface of the gel with a layer of ethanol for aging, replace the ethanol every 8 hours, and replace it 5 times, and then perform supercritical carbon dioxide drying at a temperature of 43 ° C, a pressure of 7.5 MPa, and a time of 4 hours to obtain an airgel Crude;

[0040] (4) Calcining the crude airgel at 600° C. for 4 hours to obtain the long-lasting l...

Embodiment 3

[0043] Adopt the same preparation method as Example 1, the difference is that the preparation conditions used are different, specifically comprising the following steps:

[0044] (1) Dissolve 0.01mol zinc nitrate hexahydrate, 0.01mol gallium nitrate hydrate and 0.0001mol chromium nitrate nonahydrate in ethanol, mix well, then add 0.13mol deionized water and 0.045mol polyacrylic acid, stir at 1000r / min Down stirring 15min, obtain mixed solution;

[0045] (2) Add 1.5mol propylene oxide to the mixed solution, stir for 15min at a stirring speed of 1000r / min, and then let it stand until it turns into a gel;

[0046] (3) Cover the surface of the gel with a layer of ethanol for aging, replace the ethanol every 12 hours, and replace it 3 times, and then perform supercritical carbon dioxide drying at a temperature of 38 ° C, a pressure of 9.5 MPa, and a time of 3 hours to obtain an airgel Crude;

[0047] (4) Calcining the crude airgel at 1200° C. for 2 hours to obtain the long-lastin...

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Abstract

The invention relates to a long afterglow luminous airgel and a preparation method thereof. The nitrate solutions of three metals (Zn, Ga, Cr) are mixed according to a certain molar ratio by using a sol-gel method, and polyacrylic acid (PAA) As a dispersant, propylene oxide (PO) is used as a gel accelerator, placed at room temperature to gel, then replaced by ethanol solvent, supercritically dried with carbon dioxide, and finally calcined in a muffle furnace to prepare long-lasting ZnGa with red light 2 o 4 :Cr 3+ airgel. The long-lasting luminous airgel in the present invention belongs to porous nanomaterials, has a high specific surface area, and has good adsorption performance, and it can still emit light continuously after the ultraviolet light is stopped, so it has high research value in the field of biomedicine .

Description

technical field [0001] The invention relates to the technical field of airgel materials, in particular to a long-lasting luminescent airgel and a preparation method thereof. Background technique [0002] The world is colorful because of light, and the development and application of luminescent materials are profoundly and beautifully changing our lives. As a very important class of solid luminescent materials, the research on long afterglow luminescent materials started as early as the 1870s. After excitation, that is, after the external action stops, the luminescence does not disappear immediately but gradually weakens. This process is called afterglow. The systems of long afterglow luminescent materials mainly include the following types: sulfide system, aluminate system, silicate system, gallate system and so on. Its main preparation methods include high-temperature solid-phase synthesis, hydrothermal synthesis, combustion, and sol-gel method. ZnS system luminescent ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/62
CPCC09K11/68
Inventor 杜艾张婷周斌
Owner TONGJI UNIV
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