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Method for displaying latent fingerprints by adopting fluorescent dye-modified nano particles

A technology of nanoparticles and fluorescent dyes, applied in the field of public security and criminal affairs, can solve the problems of weak display sensitivity of powder, cumbersome functionalized particles, and high requirements for operation process, and achieve the effects of simple display method, no toxic side effects, and high sensitivity.

Inactive Publication Date: 2015-02-11
CHINA CRIMINAL POLICE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of functionalized particles by this method is also cumbersome, and different object surfaces need to be discriminated during use
[0009] Patent 201310364617.7 uses bovine serum albumin as a protective agent and gold nanoclusters as a fluorescent reagent, which can display latent fingerprints with high sensitivity. In this method, fingerprints are displayed clearly and have high stability, but the raw materials are limited, and The operation process is also more demanding
[0010] To sum up, there are many methods for presenting latent fingerprints, but all of them have deficiencies, and cannot effectively overcome the interference encountered in the latent fingerprint display, such as the interference from the background reflection of the object, the weak sensitivity of powder display, poor combination, and the scope of application. Technical difficulties such as limitations

Method used

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  • Method for displaying latent fingerprints by adopting fluorescent dye-modified nano particles
  • Method for displaying latent fingerprints by adopting fluorescent dye-modified nano particles
  • Method for displaying latent fingerprints by adopting fluorescent dye-modified nano particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Weigh 2g of nano-zinc oxide and 0.1g of tartrazine respectively with a balance and put them into a conical flask, and shake well;

[0042] (2) Measure 100ml of methanol and 0.2ml of N-octyltrimethoxysilane with a measuring cylinder and put them into a conical flask;

[0043](3) Put the Erlenmeyer flask into a water bath at 20° C. and heat it under reflux for 2 hours, stir with a magnetic stirrer at a rotation speed of 400 rpm, and fully react.

[0044] (4) After the reaction is finished, distilled water is added for precipitation, and the supernatant is removed after precipitation. Repeat this operation 3 to 4 times to remove alcohol. Then keep the sedimented substance, add distilled water to make 100ml of developing solution.

[0045] Appearance method:

[0046] (1) Shake the nano-zinc oxide-lemon yellow display solution obtained above to be milky, immerse the white ceramics of the inspection material suspected of having fingerprints in the liquid, and shake con...

Embodiment 2

[0050] (1) Take 3g of nano-alumina and 0.5g of tartrazine respectively with a balance and put them into a conical flask, shake them well;

[0051] (2) Measure 150ml of methanol and 1ml of N-octyltrimethoxysilane with a graduated cylinder, and put them into a conical flask;

[0052] (3) Put the Erlenmeyer flask into a water bath at 40°C and heat it under reflux for 3 hours, stir with a magnetic stirrer at 600 rpm, and fully react.

[0053] (4) After the reaction is finished, distilled water is added for precipitation, and the supernatant is removed after precipitation. Repeat this operation 3 to 4 times to remove alcohol. Then keep the sedimented substance, add distilled water to make 100ml of developing solution.

[0054] Appearance method:

[0055] (1) Shake the above-mentioned obtained nano-alumina-tartrazine display solution to be milky, immerse the inspection material glass with fingerprints in the liquid, and constantly shake;

[0056] (2) Wash off the floating color ...

Embodiment 3

[0059] (1) Take by weighing 4g of nano-zinc oxide and 0.7g of tartrazine respectively in the conical flask with a balance, fully shake;

[0060] (2) Measure 200ml of methanol and 1.5ml of N-octyltrimethoxysilane with a graduated cylinder, and put them into the conical flask;

[0061] (3) Put the Erlenmeyer flask into a water bath at 50° C. and heat it under reflux for 4 hours, stir with a magnetic stirrer at a rotation speed of 600 rpm, and fully react.

[0062] (4) After the reaction is finished, distilled water is added for precipitation, and the supernatant is removed after precipitation. Repeat this operation 3 to 4 times to remove alcohol. Then keep the sedimented substance, add distilled water to make 100ml of developing solution.

[0063] Appearance method:

[0064] (1) Shake the above-mentioned obtained nano-zinc oxide-lemon yellow display solution into a milky state, immerse the inspection material aluminum foil with fingerprints in the liquid, and shake constantly...

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Abstract

The invention provides a method for displaying latent fingerprints by adopting fluorescent dye-modified nano particles. By the adoption of organic fluorescent dye chemical modified nano particles, fluorescence excitation of a normal light source during fingerprint displaying and multi-waveband fluorescence emission are realized; residues with doubtful fingerprints are put into a uniformly vibrated displaying agent, then unfixed dyes are washed off by clean water, and the residues are naturally dried; when the residues are observed under a long-wave ultraviolet lamp, a high-contrast fluorescence characteristic can be clearly seen. According to the method, the technical difficulties of interference, such as object light reflection, during latent fingerprint displaying, low sensitivity to powder displaying, low combination property, limited application range and the like are solved; the method is easy to operate and does not have toxic and side effects.

Description

technical field [0001] The invention belongs to the technical field of public security and criminal affairs, and in particular relates to a method for developing latent fingerprints by using nano-particles chemically modified with organic fluorescent dyes to prepare reagents. Background technique [0002] Fingerprint, due to various factors such as genetic material, skin tissue structure, pathology and trauma, determine the specificity, diversity and stability of fingerprint lines, which can be used to analyze, identify and identify fingerprint lines. Identification and identification. Fingerprint visualization technology, mainly by selecting the corresponding method (illumination method, solution method, powder method, fumigation method, etc.) ) The technology of combining reaction to make latent fingerprints appear oily, blood dirt, etc.) to make latent fingerprints appear as colored fingerprints. [0003] In 1877, French doctor Aubert used silver nitrate as a solution i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/117
CPCA61B5/1172
Inventor 张丽梅张冬冬张忠良吕新华周宇龙周殷玄邵一峰孙年峰李朋姜雨彤
Owner CHINA CRIMINAL POLICE UNIV
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