Preparation method of carbon quantum dot-montmorillonite nanometer composite powder for latent fingerprint developing

A technology of carbon quantum dots and nano-composite, applied in chemical instruments and methods, applications, diagnostic records/measurements, etc., can solve problems such as poor application and low density of carbon quantum dots, and achieve low cost, clear display effect, and detailed features Easily distinguishable effects

Inactive Publication Date: 2017-09-05
喻彦林 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low density of carbon quantum dots, it is difficult to make them into powder, so it is poorly used in the display of latent fingerprints.

Method used

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  • Preparation method of carbon quantum dot-montmorillonite nanometer composite powder for latent fingerprint developing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 2.0g of citric acid and 0.2g of L-cysteine ​​into a glass beaker, add 10mL of ultrapure water for ultrasonic dissolution, and heat in a microwave oven on high heat (power density >50W / L) for 5 minutes. Subsequently, the above product was dissolved in 5mL of ultrapure water to obtain a yellow transparent carbon quantum dot solution, which was set aside; another 0.25g of sodium montmorillonite was weighed into a 1.5mL centrifuge tube, and 1mL of the above carbon quantum dot solution was added, and mixed evenly Then let it stand at room temperature for 2 hours. The supernatant is removed by centrifugation, and the precipitate is dried to obtain a carbon quantum dot-montmorillonite nanocomposite with strong fluorescence, which is ground through a 600-mesh sieve to obtain a carbon quantum dot-montmorillonite nanocomposite powder.

[0026] Experiment one: the product that embodiment 1 is made carries out stability test:

[0027] The finished products were subjected to ...

Embodiment 2

[0042] Weigh 2.0g of citric acid and 0.1g of L-cysteine ​​into a glass beaker, add 8mL of ultrapure water for ultrasonic dissolution, and heat in a microwave oven on high heat (power density>50W / L) for 3 minutes. Subsequently, the above product was dissolved in 5 mL of ultrapure water to obtain a yellow transparent carbon quantum dot solution, which was set aside; another 0.25 g of sodium montmorillonite was weighed in a 1.5 mL centrifuge tube, and 0.75 mL of the above carbon quantum dot solution was added, mixed After uniformity, it was left to stand at room temperature for 2 hours. The supernatant is removed by centrifugation, and the precipitate is dried to obtain a carbon quantum dot-montmorillonite nanocomposite with strong fluorescence, which is ground through a 600-mesh sieve to obtain a carbon quantum dot-montmorillonite nanocomposite powder.

[0043]The obtained product is carried out respectively by the experimental method of embodiment 1 in stability experiment, ani...

Embodiment 3

[0045] Weigh 2.0g of citric acid and 0.3g of L-cysteine ​​into a glass beaker, add 16mL of ultrapure water for ultrasonic dissolution, and heat in a microwave oven on high heat (power density>50W / L) for 8 minutes. Subsequently, the above product was dissolved in 5 mL of ultrapure water to obtain a yellow transparent carbon quantum dot solution, which was set aside; another 0.25 g of sodium montmorillonite was weighed in a 1.5 mL centrifuge tube, and 1.25 mL of the above carbon quantum dot solution was added, mixed After uniformity, it was left to stand at room temperature for 5 hours. The supernatant is removed by centrifugation, and the precipitate is dried to obtain a carbon quantum dot-montmorillonite nanocomposite with strong fluorescence, which is ground through a 600-mesh sieve to obtain a carbon quantum dot-montmorillonite nanocomposite powder.

[0046] The obtained product is carried out respectively by the experimental method of embodiment 1 in stability experiment, a...

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Abstract

The invention relates to a preparation method of a carbon quantum dot-montmorillonite nanometer composite powder for latent fingerprint developing. The preparation method comprises the following steps of preparing carbon quantum dots, preparing a yellow transparent carbon quantum dot solution, centrifuging, drying, grinding and the like, so as to obtain the composite powder. The carbon quantum dot-montmorillonite nanometer composite powder for the latent fingerprint developing prepared by the preparation method is used for the powder type latent fingerprint developing, and has the advantages that the strong fluorescent light is realized, and is used for fluorescent developing; the property is stable, the biocompatibility is good, the developing effect is clear, the streakline of the latent fingerprint can be well developed, and the detailed features are obvious and can be easily distinguished; in the preparation process, the obvious toxicity is avoided, and the environment-friendly effect is realized; the preparation method is simple and rapid, the cost is low, and the preparation method is suitable for being popularized and applied on market.

Description

technical field [0001] The invention specifically relates to a method for preparing a carbon quantum dot-montmorillonite nanocomposite powder for displaying latent fingerprints. Background technique [0002] Human skin has patterns of different shapes, including mastoid pattern, flexor folds, scars, etc. These patterns are collectively called skin pattern (skin pattern). Among them, fingerprints are the most widely used. Human fingerprints have the characteristics of different people, different fingers, and basically unchanged throughout life. It is one of the most reliable methods for personal identification. At the same time, due to the characteristic of "touching objects and leaving traces", fingerprints are also one of the most convenient and commonly used personal identification methods. In the detection of criminal cases, fingerprints (and the fingerprints formed thereof) are one of the most important evidences. [0003] However, most of the fingerprints left at the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65A61B5/1172
CPCC09K11/655A61B5/1172
Inventor 喻彦林颜磊
Owner 喻彦林
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