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Color silica nano-particle used for displaying latent fingerprints and preparation method thereof

A silicon dioxide and nanoparticle technology, applied in the field of identification and identification, and individual detection, can solve the problems of poor lipophilicity on the particle surface, unclear fingerprint display, disorderly distribution of dyes, etc., to improve detection sensitivity, save dye consumption, low cost effect

Inactive Publication Date: 2015-05-13
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Theaker et al. (Brenden J.Theaker, Katherine E.Hudson, Frederick J.Rowell, Doped hydrophobic silica particles as novel agents for developing latent fingerprints, Forensic Science International (2008) 174, 26-34) tetraethoxysilane (TEOS ), phenyltrimethoxysilane (PTEOS), dyes and other solvents are mixed together to prepare dye-doped silica nanoparticles. A large number of hydroxyl groups make the surface of the particles less lipophilic and difficult to adhere to fingerprints, making the fingerprints not clear enough

Method used

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  • Color silica nano-particle used for displaying latent fingerprints and preparation method thereof
  • Color silica nano-particle used for displaying latent fingerprints and preparation method thereof
  • Color silica nano-particle used for displaying latent fingerprints and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: Preparation of monodisperse silica nanoparticles of 60 ± 5nm

[0041] Mix 150g of absolute ethanol (Beijing Chemical Plant), 1g of water and 10mL of 25wt% ammonia water (Beijing Chemical Plant) evenly and add them into a 100mL flask, stir at room temperature for 30min; then add 2mL of TEOS (AlfaAesar) and react under room temperature stirring 8 hours; after the reaction, the product was washed with water several times, centrifuged, dispersed in water or centrifuged, freeze-dried, and pulverized to obtain monodisperse silica nanoparticles; the particle size was 60±5nm.

Embodiment 2

[0042] Example 2: Preparation of monodisperse silica nanoparticles of 100 ± 5nm

[0043] Mix 150g of absolute ethanol (Beijing Chemical Plant), 2g of water and 10mL of 25wt% ammonia water (Beijing Chemical Plant) evenly and add to a 100mL flask, stir at room temperature for 30min; then add 3.5mL of TEOS (Alfa Aesar), and stir at room temperature The reaction was carried out for 8 hours; after the reaction, the product was washed with water several times, centrifuged, dispersed in water or centrifuged, freeze-dried, and crushed to obtain monodisperse silica nanoparticles; the particle size was 100±5nm.

Embodiment 3

[0044] Embodiment 3: Preparation of monodisperse silica nanoparticles of 300 ± 5nm

[0045] Mix 60g of absolute ethanol (Beijing Chemical Plant), 10g of water and 3mL of 25wt% ammonia water (Beijing Chemical Plant) into a 100mL flask, stir at room temperature for 30min; then add 4mL of TEOS (Alfa Aesar), and stir at room temperature React for 8 hours; after the reaction, the product is washed with water several times, centrifuged, dispersed in water or centrifuged, freeze-dried, and pulverized to obtain monodisperse silica nanoparticles; the particle size is 300±5nm.

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Abstract

The invention provides a color silica nano-particle used for displaying latent fingerprints and a preparation method thereof. The color silica nano-particle is small in particle size and good in sensitivity for displaying latent fingerprints; the preparation method of the color silica nano-particle is simple, the cost is low, and the operation is simple; the prepared color silica nano-particle can be used for the technical fields such as individual detection, identification and recognition.

Description

technical field [0001] The invention relates to a colored silica nano-particle used for displaying latent fingerprints and a preparation method thereof, belonging to the technical field of individual detection, identification and identification. Background technique [0002] Fingerprint is one of the most reliable basis for personal identification. So far, fingerprint is still the first choice for the investigation department to carry out personal identification. In the process of investigation and handling of cases and court argumentation, the discovery and identification of latent fingerprints (that is, latent fingerprints) has special significance, and it is also a manifestation of the necessity and importance of the development of modern forensic science. However, when latent fingerprints appear on the surface of objects with special properties (such as wet surfaces, surfaces with colored backgrounds, surfaces with blood and other types of body fluids, object surfaces wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/117A61B5/1172
Inventor 孙树清牛冬子张雪梅李小青刘寰李孝君王鸿飞
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA