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Surface functionalization nanometer upconversion materials used for display of latent fingerprints

A conversion material and nanotechnology, applied in the direction of luminescent materials, material excitation analysis, application, etc., can solve the problems that the stability and reproducibility of the display effect cannot be guaranteed, and achieve the effect of easy operation and cost reduction

Inactive Publication Date: 2013-02-13
JIANGSU POLICE INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition to Xin Juan (synthesis of nano-fluorescent particle YVO4:Eu and its application in fingerprint visualization), the simple modification of nano-upconversion materials with disodium ethylenediaminetetraacetic acid (EDTA-Na), other people used The nano up-conversion material is without any chemical modification, only relying on the electrostatic properties of the surface of the nano-particles, so that the components of the nano-up-conversion material and the fingerprint residue are physically adsorbed to reveal the potential fingerprint, which makes the stability and reproducibility of the display effect Currency cannot be guaranteed

Method used

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  • Surface functionalization nanometer upconversion materials used for display of latent fingerprints
  • Surface functionalization nanometer upconversion materials used for display of latent fingerprints
  • Surface functionalization nanometer upconversion materials used for display of latent fingerprints

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) 0.1 g of red nano-scale up-conversion material was alkalized in 0.5 mol / L NaOH solution for 4 hours with magnetic stirring, the supernatant was poured off by centrifugation, and the up-conversion material solution was washed with distilled water to pH 7.0. Then, it was stirred with 0.5 mol / L HCl solution for 0.5 hours, and after removing the supernatant, the up-conversion material was washed with distilled water to pH 6.5, and vacuum-dried at 120° C. to constant weight.

[0029] 2) Add 0.1 g of alkalized up-conversion material to 8 mL of absolute ethanol solution, adjust the pH to 3.0 with acetic acid, and add 0.01 g of 3-aminopropyltriethoxysilane ( KH550) solution, ultrasonically dispersed, reacted at 80°C for 8 hours, centrifuged to pour off the supernatant, washed the up-conversion material with distilled water for 3 times, and vacuum-dried at 120°C to constant weight.

[0030] 3) Disperse 0.5mL of 25% glutaraldehyde solution in 9.5mL of pH 6.0 phosphate buffer s...

Embodiment 2

[0033]1) 0.1 g of red nano-scale up-conversion material was alkalized in 1.5 mol / L KOH solution for 3 hours with magnetic stirring, the supernatant was discarded by centrifugation, and the up-conversion material solution was washed to pH 6.8 with distilled water. Then, it was stirred with 2.0 mol / L HCl solution for 2 hours, and after the supernatant was poured off by centrifugation, the up-conversion material was washed to pH 6.8 with distilled water, and vacuum-dried at 120° C. to constant weight.

[0034] 2) Add 0.1 g of alkalized up-conversion material to 8 mL of absolute ethanol solution, adjust the pH to 4.0 with acetic acid, and add 0.02 g of 3-aminopropyltriethoxysilane ( KH550) solution, ultrasonically dispersed, reacted at 55°C for 11.5 hours, centrifuged to pour off the supernatant, washed the up-conversion material with distilled water for 3 times, and vacuum-dried at 120°C to constant weight.

[0035] 3) Disperse 0.134g of terephthalaldehyde in 10mL of PH7.0 phosph...

Embodiment 3

[0038] 1) 0.1 g of green nano-scale up-conversion material was alkalized in 2.0 mol / L NaOH solution for 2 hours with magnetic stirring, the supernatant was discarded by centrifugation, and the up-conversion material solution was washed to pH 6.5 with distilled water. Then, it was stirred with 1.5 mol / L HCl solution for 1.5 hours, and after centrifuging to pour off the supernatant, the up-conversion material was washed to pH 7.0 with distilled water, and vacuum-dried at 120° C. to constant weight.

[0039] 2) Add 0.1 g of alkalized up-conversion material to 8 mL of absolute ethanol solution, adjust the pH to 5.0 with acetic acid, and add 0.015 g of 3-aminopropyltriethoxysilane ( KH550) solution, ultrasonically dispersed, reacted at 30°C for 15 hours, centrifuged to pour off the supernatant, washed the up-conversion material with distilled water for 3 times, and vacuum-dried at 120°C to constant weight.

[0040] 3) Disperse 0.2g o-phthalaldehyde solution in 10mL pH 8.0 phosphate...

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Abstract

The invention belongs to the technical field of criminal science, and particularly relates to an aldehyde group modification method of surface functionalization nanometer upconversion materials, wherein the aldehyde group modification method is used for display of latent fingerprints. Aldehyde group reacts with amino acid residue in the latent fingerprints, is deposited on the fingerprints through chemical coupling, and can emit visible colored fluorescence under radiating of 980 nanometer infrared light, and therefore the latent fingerprints on the surface of an object can be cleared displayed. The surface functionalization nanometer upconversion materials have the advantages that the using method is simple and easy to carry out, functionalization particles can be stored for a long time, background interference is little, and the like.

Description

technical field [0001] The invention belongs to the technical field of criminal science, and in particular relates to an aldehyde group modification method of surface-functionalized nanometer upconverting particles and its application to the visualization of latent fingerprints. Background technique [0002] The visualization of fingerprints, especially latent fingerprints, plays a very important role in forensic science and criminal proceedings. In recent years, the application of nanomaterials to reveal latent fingerprints has become a hot topic of research by experts at home and abroad. Nanomaterials display latent fingerprints is the use of nanotechnology to process fingerprint residues, so that latent fingerprints become visible images, and the images are recorded for identification and identification. Its principle is that nanomaterials are combined with components in fingerprint residues, such as amino acids, oils, etc., through physical or chemical reactions, and th...

Claims

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Application Information

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IPC IPC(8): A61B5/117C09K11/02G01N21/64A61B5/1172
Inventor 王军高瑞朱玉亮
Owner JIANGSU POLICE INST
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