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Surface modification method of silica particles and method for displaying latent fingerprints

A silicon dioxide and particle technology, applied in the field of detection, can solve problems such as affecting the development effect, and achieve the effects of convenient use, low cost and simple preparation process

Inactive Publication Date: 2010-08-04
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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Problems solved by technology

Moreover, the solution developer used to display fingerprints reported in these two patents needs to be dissolved in a mixed solvent of water and alcohol, which will cause some important components in the fingerprint to be dissolved by the alcohol solution, affecting the developing effect

Method used

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  • Surface modification method of silica particles and method for displaying latent fingerprints
  • Surface modification method of silica particles and method for displaying latent fingerprints
  • Surface modification method of silica particles and method for displaying latent fingerprints

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Embodiment Construction

[0021] The silica particles involved in the present invention are improved Prepared by the method, by changing the type of silicate, the type of alcohol, the ratio of water and concentrated ammonia water, the size of silica particles can be regulated, and the particle size can be controlled in the range of 100 nanometers to 100 microns, usually 100- 900 nm, preferably 400-500 nm.

[0022] The modified silica particles provided by the present invention are formed by the reaction of silica nanoparticles and silane coupling agents. By changing the type of silane coupling agents, silica particles with different surface properties are obtained, preferably phenyl Trimethoxysilane, (4-chlorophenyl)triethoxysilane, (4-chlorophenyl)trichlorosilane, 4-chloromethylphenyltrichlorosilane or octadecyltrichlorosilane as coupling agent.

[0023] According to the difference in the particle size of the silica particles, the mass ratio of the silica particles and the silane coupling agent can...

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Abstract

The invention discloses a preparation method of silica particles, a method for displaying latent fingerprints by using the silica particles prepared by using the method, and the silica particles prepared by using the method. The preparation method comprises the following step of: sufficiently reacting the silica particles with a silane coupling agent with a mass ratio of (1:2)-(10:1) or (50:1)-(1,000:1). Because modified silica particles provided by the invention have good oleophylic property, the modified silica particles have better binding force with residual substances in fingerprints and can be used as a dust brushing reagent for fingerprint detection and / or analysis. The invention also provides biparental silica particles which can be dispersed in water to obtain a stable suspension, and the suspension can be applied to the latent fingerprints or the surfaces in a liquid medium so as to determine whether the fingerprints exist or not.

Description

technical field [0001] The invention belongs to the technical field of detection. Specifically, the invention relates to the preparation of surface-modified silicon dioxide series particles (including hydrophobic and amphiphilic silicon dioxide particles) and their application in fingerprint development. Background of the invention [0002] The appearance of fingerprints, especially latent fingerprints, is a very important technique in case investigation. At present, the commonly used fingerprint display methods mainly include: physical development method, chemical development method and optical development method. Among them, the chemical development method is still the most commonly used method by criminal technicians because of the specific chemical interaction between the chemical developer used and the fingerprint residue deposited on the object at the crime scene, its convenience in use, and its good development effect. In recent years, with the continuous development...

Claims

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Application Information

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IPC IPC(8): C01B33/12G01Q30/02
Inventor 孙树清马辉何永红张雪梅王桂强许小京
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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