Method for using fluorescent silicon dioxide to display laten fingerprint
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A silicon dioxide and latent fingerprint technology is applied in the detection field to achieve the effects of no toxic side effects, simple method and low cost.
Inactive Publication Date: 2010-02-17
NORTHEAST NORMAL UNIVERSITY
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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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Embodiment 1
[0025] Preparation of fluorescent silica nano-powder: microemulsion is composed of the following reagents: normal temperature, under magnetic stirring, cyclohexane 7.5ml, n-hexanol 1.8ml, Triton X-100 1.8ml three kinds of solutions are mixed, then add 0.5 ml of 20mM 1,10-phenanthroline ruthenium aqueous solution, 0.1ml of ethyl orthosilicate, after mixing and stirring for 20 minutes, add 70μl of ammonia water with a mass fraction of 25%, and the mixed solution was stirred rapidly, and reacted for 24 hours. Add an equal volume of acetone to break the emulsion, centrifuge the obtained product, wash with ethanol, and dry to obtain yellow fluorescent silica nanopowder (powder 1) with a particle diameter of about 65 nanometers.
[0026] Appearance method:
[0027] When using, use a brush to dip in the powder, and gently brush various surfaces with latent fingerprints, including glass sheets, plastic bottles, cans, copper sheets, aluminum foil, tables or the surface of laboratory be...
Embodiment 2
[0030] Preparation of fluorescent silica nanopowder:
[0031] (1) Prepare 4ml of tetraethyl orthosilicate and add in 20ml ethanol solution (mixed solution one), and the ammoniacal liquor of 12ml, 25ml ethanol, the mixed solution of the aqueous solution of 1,10-o-phenanthroline ruthenium with 1ml 20mM (mixed solution two);
[0032] (2) At room temperature, the two solutions were mixed rapidly under fast electric stirring. After reacting for 8 hours, the obtained product was centrifuged, washed with secondary water, and dried to obtain yellow silica microsphere powder (powder 2) .
[0033] Appearance method:
[0034] When using, use a brush to dip in the powder, and gently brush various surfaces with latent fingerprints, including glass sheets, plastic bottles, cans, copper sheets, aluminum foil, tables or the surface of laboratory benches, and you can observe the yellow fingerprint lines that appear , emit orange light under the ultraviolet light source, take a picture with ...
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Abstract
The invention relates to a method for using fluorescent silicon dioxide to display laten fingerprints, belonging to the technical field of detection. In the invention, a fluorescent silicon dioxide monodisperse nanometer rubber ball is prepared by a reverse-phase microemulsion polymerization method, and a classical st ber method is used and improved, a fluorescent silicon dioxide rubber ball doping dyes is synthesized in one step by hydrolyzing TEOS in alkaline condition, and the laten fingerprints with different object surfaces are displayed by the fluorescent silicon dioxide rubber ball. Thenanometer powder of the fluorescent silicon dioxide has high fluorescence intensity and can be used for displaying the laten fingerprints positioned on the surfaces of a glass sheet, a plastic bottle, a pop can, a copper sheet, an aluminium foil and a desk or an experiment table in a brushing way or displaying the laten fingerprints positioned on moist surfaces by an ultraphonic precipitation method, and the displayed laten fingerprints emit orange light under an ultraviolet light source. The invention has easy operation, small using amount, large application range and good effect and can display the laten fingerprints positioned on a plurality of specific objects.
Description
technical field [0001] The invention belongs to the technical field of detection, and in particular relates to a method for displaying latent fingerprints by fluorescent silica. Background technique [0002] Fingerprint identification is one of the most reliable methods for personal identification, and fingerprints play an important role in evidence in forensic science and criminal proceedings. However, in all kinds of crimes, criminals use more and more insidious and hidden means of committing crimes. The fingerprints that appear at the crime scene are often latent. The so-called latent fingerprint refers to that when a person's fingers or palms touch an object, the skin papillae on the surface of the object will be left on the surface of the object due to sweat or oil in contact with the surface of the object. Imprint of line pattern. This kind of imprint left on the surface of a dull object cannot be directly observed by eyesight or with the help of a light source. Like...
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