Method for using silicon dioxide and polystyrene functionalized particle in hidden fingerprint appearance

Abstract

The invention belongs to the technical field of detection, and particularly relates to a method for potential fingerprint manifestation on different surfaces by silicon dioxide, polystyrene micron glueballs and the functional micron particles of the silicon dioxide and the polystyrene micron glueballs. The invention provides a method for manifesting potential fingerprints on surfaces of glass, plastic, metal, composite boards (lacquer wood), paper, and so on, by the silicon dioxide, polystyrene and the functionalized micron particles thereof. Silicon dioxide particles and fluorescent silicon dioxide modified by various dye molecules are improved and synthesized by a classical stober method (size can be within the range of between 10 and 100 microns), monodisperse silicon dioxide microspheres are taken as template to prepare microspheres of a nuclear shell structure; and monodisperse glueballs of the polystyrene are prepared by an emulsion polymerization method, and a dry powder brush development method and a wet method are used for manifestation. The method is simple, quick and easy to operate, does not contain toxic constituents, has safe use and high sensitivity, and can realize the manifestation of old fingerprints.

Description

technical field The invention belongs to the technical field of detection, and in particular relates to the preparation of silicon dioxide and polystyrene micron rubber balls and functionalized micron particles and a method for displaying latent fingerprints on different surfaces. Background technique Fingerprints play an important evidential role in forensic science and criminal proceedings. However, in all kinds of crimes, criminals use more and more insidious and hidden means of committing crimes. Fingerprints that appear at crime scenes are often latent and require some visualization method to observe their texture. Therefore, scientifically and correctly discovering, extracting, and displaying identification fingerprints has important practical functions and immeasurable social value for the investigation of cases and the punishment of crimes. Since the French doctor Aubert used silver nitrate to reveal sweat fingerprints on paper in 1877, fingerprint visualization h...

AI Technical Summary

Problems solved by technology

Although many visualization technologies already exist, the research and development of non-toxic and high-sensitivity on-site bioimprint visualization technology is still the focus of forensic research and the direction of efforts of criminal technicians from all over the world

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