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Application method of fluorescent conjugated oligomer silicon dioxide composite nano particles in laten fingerprint development

A technology of composite nanoparticles and silicon dioxide, applied in chemical instruments and methods, applications, nanotechnology, etc., can solve the problems of high background interference, difficult application, low contrast, etc., and achieve expanded material range, low background interference, and contrast High effect

Active Publication Date: 2017-09-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the powder method often uses fluorescent materials, metal materials and magnetic materials. Because the method is simple and effective, it has been widely used in the detection of latent fingerprints on different surfaces, although this method is effective for the detection of latent fingerprints under certain common conditions. Yes, but it still suffers from several limitations such as difficult application on some surfaces, low contrast, poor selectivity, high background interference, toxic

Method used

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  • Application method of fluorescent conjugated oligomer silicon dioxide composite nano particles in laten fingerprint development
  • Application method of fluorescent conjugated oligomer silicon dioxide composite nano particles in laten fingerprint development
  • Application method of fluorescent conjugated oligomer silicon dioxide composite nano particles in laten fingerprint development

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] ①Mix 64 μL of 5 mg / mL silane-modified fluorescent conjugated oligomer OPF-Si-1 in chloroform and 100 μL of tetraethoxysilane evenly, the molar ratio of the two is 1:2000, OPF-Si-1 The structural formula is:

[0031]

[0032] ②Use the method of reverse micelles to prepare fluorescent composite nanoparticles, add cyclohexane 7.6mL, n-hexanol 1.8mL, polyethylene glycol monooctyl phenyl ether 1.8mL, deionized water 0.48mL into the round bottom flask successively , Stir vigorously at room temperature for 10 minutes, stir evenly, add the mixed solution in step ③ dropwise, and then add 100 μL ammonia water with a mass fraction of 25-28% as a catalyst dropwise, and react at room temperature for 24 hours.

[0033] ③ Add 6 mL of acetone to the reaction solution in step ② and stir for 10 minutes, then centrifuge and wash to obtain fluorescent composite nanoparticles.

[0034] ④ Dispersing the fluorescent composite nanoparticles obtained in step ③ in water and freezing them int...

Embodiment 2

[0038] ①Mix 32 μL 5 mg / mL silane-modified fluorescent conjugated oligomer OPF-Si-2 in chloroform and 100 μL tetraethoxysilane evenly, the molar ratio of the two is 1:3000, OPF-Si-2 The structural formula is:

[0039]

[0040] ②Use the method of reverse micelles to prepare fluorescent composite nanoparticles, add cyclohexane 7.6mL, n-hexanol 1.8mL, polyethylene glycol monooctyl phenyl ether 1.8mL, deionized water 0.48mL into the round bottom flask successively , Stir vigorously at room temperature for 10 minutes, stir evenly, add the mixed solution in step ③ dropwise, and then add 100 μL ammonia water with a mass fraction of 25-28% as a catalyst dropwise, and react at room temperature for 24 hours.

[0041] ③ Add 6 mL of acetone to the reaction solution in step ② and stir for 10 minutes, then centrifuge and wash to obtain fluorescent composite nanoparticles.

[0042] ④ Dispersing the fluorescent composite nanoparticles obtained in step ③ in water and freezing them into ice, v...

Embodiment 3

[0046] ①Mix 29 μL of 5 mg / mL silane-modified fluorescent conjugated oligomer OPF-Si-3 in chloroform and 100 μL of tetraethoxysilane evenly, the molar ratio of the two is 1:4000, OPF-Si-3 The structural formula is:

[0047]

[0048] ②Use the method of reverse micelles to prepare fluorescent composite nanoparticles, add cyclohexane 7.6mL, n-hexanol 1.8mL, polyethylene glycol monooctyl phenyl ether 1.8mL, deionized water 0.48mL into the round bottom flask successively , Stir vigorously at room temperature for 10 minutes, stir evenly, add the mixed solution in step ③ dropwise, and then add 100 μL ammonia water with a mass fraction of 25-28% as a catalyst dropwise, and react at room temperature for 24 hours.

[0049] ③ Add 6 mL of acetone to the reaction solution in step ② and stir for 10 minutes, then centrifuge and wash to obtain fluorescent composite nanoparticles.

[0050] ④ Dispersing the fluorescent composite nanoparticles obtained in step ③ in water and freezing them int...

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Abstract

The invention belongs to the field of the application of composite nano particles, and relates to an application method of fluorescent conjugated oligomer silicon dioxide composite nano particles in laten fingerprint development. A reversed micelle method is used for preparing the fluorescence conjugated oligomer silicon dioxide composite nano particles, then the fluorescence conjugated oligomer silicon dioxide composite nano particles are freeze-dried into powder and placed onto laten fingerprints of different materials, the surplus composite nano particles are removed by utilizing airflow, a camera is used for imaging under the illumination of a light source of a given wavelength, a fingerprint image with high resolution ratio is obtained, and details in the fingerprint such as forks, terminals can be clearly seen. The fluorescent conjugated oligomer silicon dioxide composite nano particles has the advantages of simplicity, rapidness and convenience in operation, good photochemical stability, high fluorescent strength and the like and can further improve the detection limit of the laten fingerprints when applied to the laten fingerprint development.

Description

technical field [0001] The invention belongs to the application field of composite nanoparticles, and in particular relates to an application method of fluorescent conjugated oligomer silicon dioxide composite nanoparticles in developing latent fingerprints. Background technique [0002] Latent fingerprint recognition plays a very important role in the fields of criminal science, accident identification, information identification and security inspection. Latent fingerprints can provide a lot of information: the sex of a person, the presence of human metabolites, explosives or substances of abuse. However, in most cases, latent fingerprints are not easily detected by human eyes due to their poor optical contrast. Therefore, latent fingerprints need to be physically or chemically treated to make them detectable. [0003] Early latent fingerprint detection methods included ninhydrin method and iodine fumigation method. Since then, powder method, metal deposition, fluorescent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/06C09K11/02A61B5/1172B82Y20/00B82Y30/00B82Y40/00
CPCA61B5/1172B82Y20/00B82Y30/00B82Y40/00C09K11/025C09K11/06C09K2211/1011
Inventor 李立东崔倩玲张仕杰
Owner UNIV OF SCI & TECH BEIJING