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Two-step latent fingerprint manifesting method based on nano-particles

A nanoparticle and latent fingerprint technology, which is applied in the fields of human identification, medical science, and diagnosis by using light, can solve the problems of poor display effect, poor sensitivity, and large influence of background factors, and achieve high sensitivity and high contrast fluorescence characteristics , the effect of easy operation

Inactive Publication Date: 2015-03-04
CHINA CRIMINAL POLICE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has convenience and good fingerprint display effect, but it is greatly affected by background factors
[0011] To sum up, there are many methods for displaying latent fingerprints in the prior art, among which the display effect of nanoparticles has advantages, but the combination, fluorescence excitation and multi-band fluorescence emission of common light sources need to be improved; the smoke method is simple and fast, But the display effect and sensitivity are poor

Method used

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  • Two-step latent fingerprint manifesting method based on nano-particles
  • Two-step latent fingerprint manifesting method based on nano-particles
  • Two-step latent fingerprint manifesting method based on nano-particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The preparation method of nanoparticle display liquid:

[0044] (1) take by weighing 3g nano-alumina with balance, put into Erlenmeyer flask;

[0045] (2) Add 100ml of distilled water to the Erlenmeyer flask, then add 0.2ml of N-octyltrimethoxysilane, and mix well;

[0046] (3) Stir in a magnetic stirrer with a rotation speed of 400 rpm, reflux in a water bath at 20°C for 1 hour, and fully react;

[0047] (4) Remove the supernatant from the reacted solution, wash it with distilled water for several times, and finally add stabilizer distilled water to make a nano-alumina developing solution.

[0048] Preparation of organic fluorescent dye colorants:

[0049] (5) Weigh 0.2g of cationic yellow with a balance, add 100ml of methanol to make cationic yellow dye.

[0050] Appearance method:

[0051] (6) Shake the nano-aluminum sesquioxide solution prepared by step (4) into milk;

[0052] (7) Immerse the white ceramic material suspected to have fingerprints in the liquid a...

Embodiment 2

[0056] (1) take by weighing 4g nano-alumina with balance, put into Erlenmeyer flask;

[0057] (2) Add 150ml of distilled water to the Erlenmeyer flask, then add 1ml of N-octyltrimethoxysilane, and mix well;

[0058] (3) Stir in a magnetic stirrer with a rotation speed of 600 rpm, reflux in a water bath at 30°C for 1.5 hours, and fully react;

[0059] (4) Remove the supernatant from the reacted solution, wash it with distilled water for several times, and finally add stabilizer distilled water to make a nano-alumina developing solution.

[0060] Preparation of organic fluorescent dye colorants:

[0061] (5) Weigh 0.4g of Cationic Yellow with a balance and add 100ml of methanol to make Cationic Yellow dye.

[0062] Appearance method:

[0063] (6) Shake the nano-aluminum sesquioxide solution prepared by step (4) into milk;

[0064] (7) Immerse the glass of the material to be inspected that is suspected to have fingerprints in the liquid and shake it continuously, and the fing...

Embodiment 3

[0068] (1) Take by weighing 5g nano-aluminum sesquioxide with balance, put into Erlenmeyer flask;

[0069] (2) Add 200ml of distilled water to the Erlenmeyer flask, then add 2ml of N-octyltrimethoxysilane, and mix well;

[0070] (3) Stir in a magnetic stirrer with a rotation speed of 800 rpm, reflux in a water bath at 60°C for 2 hours, and fully react;

[0071] (4) Remove the supernatant from the reacted solution, wash it with distilled water for several times, and finally add stabilizer distilled water to make a nano-alumina developing solution.

[0072] Preparation of organic fluorescent dye colorants:

[0073] (5) Weigh 0.5g of cationic yellow with a balance, add 100ml of methanol to make a cationic yellow dye.

[0074] Appearance method:

[0075] (6) Shake the nano-aluminum sesquioxide solution prepared by step (4) into milk;

[0076] (7) Immerse the aluminum foil of the material to be inspected that is suspected to have fingerprints in the liquid and shake it continuo...

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Abstract

The invention relates to a two-step latent fingerprint manifesting method based on nano-particles. The two-step latent fingerprint manifesting method based on nano-particles includes that firstly, combining zinc oxide or aluminum oxide nano-particles with micro substances at the fingerprint surface through a physical or chemical method to realize high-sensitivity fingerprint manifesting; secondly, using organic fluorescent dye coloring agent to adsorb the manifested fingerprint so as to realize the high-contrast fluorescence characteristic manifesting of the fingerprint. The two-step latent fingerprint manifesting method based on nano-particles has advantages of high sensitivity, strong associativity, background reflection interference resistance, multi-waveband fluorescence emitting and the like, and both the manifesting rate and sensitivity are higher than those of a powder manifesting method and a 502 glue fuming method.

Description

technical field [0001] The invention belongs to the technical field of public security criminals, and in particular relates to a two-step latent fingerprint display method based on nanoparticles. Background technique [0002] Fingerprints refer to the imprints that reflect the papillae pattern of the finger skin on the surface of the object due to the interaction of sweat and oil with the surface of the object when the human finger touches the object. With its special physiological structure and characteristic system, fingerprints have become one of the most valuable physical evidence in the field of criminal investigation. Fingerprint identification is one of the most reliable methods of personal identification and plays a pivotal role in detecting and solving crimes. [0003] Fingerprint technology originated in China, and fingerprint science emerged in Europe. As early as the middle of the 19th century, the scientific community began to study fingerprints. In 1856, Oake...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/117
CPCA61B5/0059A61B5/1172A61B5/48
Inventor 张丽梅张忠良张冬冬邵一峰孙年峰李朋姜雨彤周宇龙周殷玄
Owner CHINA CRIMINAL POLICE UNIV
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