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Bio-based luminescent nano material and preparation method and application thereof

A nano-material and bio-based technology, applied in the field of materials, can solve the problems of reducing processability and practicability, limiting applications, application obstacles, etc., and achieve the effect of enhancing the effect of resonance scattering

Active Publication Date: 2020-05-12
重庆纳研新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These MOFs crystal powders are very hard, on the one hand, it will reduce their processability and practicability as membranes, filters and towers, thus limiting their application in these fields; on the other hand, their inherent micropores The mesoporous structure also limits their usable surface area and diffusion kinetics, thus hindering their application in macromolecules and nanomaterials, leaving many high-value functional properties of nano-MOF composites to be further investigated

Method used

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  • Bio-based luminescent nano material and preparation method and application thereof
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  • Bio-based luminescent nano material and preparation method and application thereof

Examples

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Embodiment 1

[0043] A bio-based luminescent nanomaterial, the material uses cellulose nanocrystals as the core and ZIF-8 as the shell, wherein the cellulose nanocrystals are aligned in the cavity of the ZIF-8. The material is prepared as follows:

[0044] (1) First, soak 20 g of short-staple cotton in sodium hydroxide alkali solution for alkali treatment, and then mechanically stir and react at a speed of 3500 rpm for 12 hours at room temperature, then wash the obtained cotton with clear water to neutrality, and put it in an oven for 55 Dry at ℃ for 24 hours to obtain alkali-treated cotton. Take 5g of alkali-treated cotton, add it to 45wt% sulfuric acid aqueous solution, and mechanically stir at 3500rpm at 50°C for 30min to obtain a suspension. Put the suspension into an ice bath and cool it to normal temperature, then pour it into Dialyze in a dialysis bag until the solution is neutral to obtain cellulose nanocrystals, denoted as SCNC;

[0045] (2) Add the SCNC and 2-methylimidazole pre...

Embodiment 2

[0059] Preparation of derivatives of bio-based luminescent nanomaterials

[0060] (1) Add citric acid and urea to distilled water at a mass ratio of 1:1 until the citric acid and urea are completely dissolved, then stir the solution at 150°C for 7 hours, and then dialyze with distilled water for 3 days to obtain carbon nanodots, which are denoted as CND ;

[0061] (2) Add the ZIF-8@SCNC prepared in Example 1 to the dispersion of carbon nano-dots obtained in step (1), stir and react for 15h, use distilled water as the washing liquid, and wash 3 times at a speed of 12000rpm, each After 3 minutes, the obtained precipitate was dried to prepare a derivative of bioluminescent nanomaterial (CND@ZIF-8@SCNC).

[0062] Using Talos-f200x transmission electron microscope to test the above CND@ZIF-8@SCNC, the results are as follows Figure 8 shown by Figure 8 It can be seen that carbon nanodots exist in ZIF-8@SCNC, the size of carbon nanodots is below 20nm, and the lattice size is 0.22...

Embodiment 3

[0065] Preparation of derivatives of bio-based luminescent nanomaterials

[0066] (1) Put chloroplatinic acid with a mass fraction of 20% into distilled water, add 1 mL of sodium hydroxide solution with a mass fraction of 50% dropwise at 0°C at a rate of 0.05mL / 3s, and keep the temperature after the addition is completed After stirring and reacting for 1 hour, the temperature was raised to 25° C. and then stirred and reacted for 3 hours to obtain a platinum nanoparticle solution;

[0067] (2) Add the ZIF-8@SCNC prepared in Example 1 to the platinum nanoparticle solution obtained in step (1), stir and react for 15h, use distilled water as the washing liquid, and wash 3 times at a speed of 10000rpm, each time for 3min , and dry the obtained precipitate.

[0068] Figure 10is the nitrogen adsorption-desorption curve of the derivatives of the above-mentioned bio-based luminescent nanomaterials, by Figure 10 It can be seen that the specific surface distribution of the derivativ...

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Abstract

The invention relates to a bio-based luminescent nano material and a preparation method and application thereof, and belongs to the technical field of materials. According to the material, cellulose nanocrystals serve as a core, MOFs serve as a shell, and the cellulose nanocrystals are directionally arranged in a MOFs cavity. By introducing nano-particles of which the maximum emission wavelength and the maximum excitation wavelength are matched with the maximum emission wavelength and the maximum excitation wavelength of the cellulose nanocrystalline into pores of the MOFs in the material, a derivative of the material is formed. Because the bio-based luminescent nano material and the derivative thereof have higher luminous intensity, the two materials can be well applied to the fields of information counterfeiting prevention, active substance tracing, biomarkers, catalysis or sensing, and the preparation processes of the two materials are simple, easy to operate, low in raw material cost, environment-friendly and suitable for expanded production.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a bio-based luminescent nanometer material and its preparation method and application. Background technique [0002] Cellulose is one of the most abundant sources of renewable biomass materials. Its crystalline form, i.e., cellulose nanocrystals, after being induced to align regularly, forms a chiral nematic structure that can selectively reflect circularly polarized light, resulting in Structural color. By adjusting its periodic arrangement, cellulose nanocrystals can emit light of a specific frequency by enhancing resonance scattering under the stimulation of external light. Since this photoluminescence phenomenon is a photoinduced virtual state transition luminescence caused by Stokes scattering, compared with traditional fluorescent luminescent materials, the luminescence of this luminescent material is not affected by photobleaching and aggregation-induced que...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/06C09K11/02C09K11/65C09K11/87
CPCC09K11/06C09K11/02C09K11/65C09K11/87C09K2211/145
Inventor 黄进甘霖郑蜀玉黄海涛
Owner 重庆纳研新材料科技有限公司
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