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Composition for fingerprint imaging and its application

A composition and fingerprint technology, applied in the fields of application, medical science, diagnosis, etc., can solve the problem of inapplicable objects of similar colors, and achieve the effect of excellent fingerprint imaging effect, good adhesion and wide applicability.

Active Publication Date: 2021-04-09
THE HONG KONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, one of the disadvantages of the powder imaging method is that the powder used in this method has only the appearance color, so it is not suitable for objects with similar colors

Method used

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  • Composition for fingerprint imaging and its application
  • Composition for fingerprint imaging and its application
  • Composition for fingerprint imaging and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] Example 1. Preparation and Fingerprint Imaging of Silica-Tetraphenylethylene (TPE) Composition

[0091] 600 mesh silicon dioxide (SiO 2 ) powder and TPE were dissolved in dichloromethane (DCM) according to different weight ratios (respectively 20:1, 30:1, 40:1 and 50:1), treated under 40kHz, 185W ultrasound for 10 minutes, and then used Rotary evaporator was dried at 30-40°C to obtain silica-tetraphenylethylene (SiO 2 - TPE) powder, the particle size of the powder is 300-400 mesh.

[0092] Then SiO 2 - TPE powder is brushed from one direction to the other to show the standard fingerprint on the glass slide (the term "standard fingerprint" is a conventional technical term in the field of fingerprint imaging, which refers to the fingerprint whose mastoid line meets the following nine detailed features: starting point, end point, divergence, combination, small ditch, small bridge, small eye, small stick, small point). Under the daylight and 365nm band hand-held UV lamp...

Embodiment 2

[0093] Example 2. SiO 2 -TPE, SiO 2 -TPE-4OMe, SiO 2 -TPE-OBu, SiO 2 - Preparation of TPA-TPE and its comparison with commercially available blue fluorescent powder

[0094] All SiO 2 -AIE powder is prepared in the same manner as in Example 1, wherein silicon dioxide (SiO 2 ) The particle size of the powder is 300-400 mesh, SiO 2 The weight ratio to TPE, TPE-4OMe, and TPE-OBu is 30:1, and the particle size of the prepared powder is 300-400 mesh.

[0095] According to the method of embodiment 1 SiO 2 -TPE, SiO 2 -TPE-OBu and SiO 2 -TPE-4OMe applied over standard fingerprints on glass slides. Imaging results such as figure 2 shown. As can be seen from the bright field images, SiO 2 - Adhesion of TPE-4OMe is better than that of SiO 2 - TPE is better, and the fluorescence imaging effect is better than SiO 2 -TPE is better. The bright field imaging effect of TPE-OBu is also relatively good, and the fluorescence imaging effect is very clear. This demonstrates that a...

Embodiment 3

[0097] Example 3. Preparation and comparative experiments of Mag, Mag-TPE, Mag-TPA-TPE, Mag-Silo-OMe, Mag-DPA-IQ, Mag-DPI-B, Mag-TPA-TPP, Mag-TFE

[0098] Mag-TPE, Mag-TPA-TPE, Mag-Silo-OMe, Mag-DPA-IQ were prepared by mixing different types of AIE molecules with magnetic powder (Mag) (purchased from Beijing Finger Technology Co., Ltd., D008) , Mag-DPI-B, Mag-TPA-TPP and Mag-TFE powders, the preparation method is carried out as described in Example 1, wherein the weight ratio of magnetic powder to the above-mentioned AIE molecules is 100:1, and the particle size of the obtained powder is 300- 400 mesh. Silo-OMe is a highly fluorescent green AIE molecule with short aliphatic chains, DPA-IQ is an orange-red AIE molecule with positive charges, and DPI-B, TPA-TPP, and TFE are AIE molecules with different core structures.

[0099] Apply Mag, Mag-TPE, Mag-TPA-TPE, Mag-Silo-OMe, Mag-DPA-IQ, Mag-DPI-B, Mag-TPA-TPP and Mag-TFE to the glass guest according to the method of Example 1 o...

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Abstract

The invention provides a composition for fingerprint imaging and the application of the composition in fingerprint imaging. The fingerprint imaging composition comprises an AIE compound and a non-AIE compound capable of adhering to a fingerprint. The composition for fingerprint imaging can be developed by both bright field and fluorescence, and has wider applicability, and the composition for fingerprint imaging has good adhesion to fingerprints, no matter in bright field It also shows excellent fingerprint imaging effect and good signal-to-noise ratio in fluorescence imaging.

Description

technical field [0001] The invention relates to fingerprint imaging, in particular to a fingerprint imaging composition comprising an AIE compound and a non-AIE compound capable of adhering to fingerprints and its application. Background technique [0002] Fingerprints are unique and complex traces deposited on the surface by the natural secretions of exocrine glands in the epidermal ridges of the fingers, which contain trace amounts of fatty acids, proteins, amino acids and inorganic salts. Due to the uniqueness of fingerprints, fingerprint analysis has been a powerful tool in forensic science to identify criminals since the early 20th century. However, unprocessed fingerprints are latent fingerprints in most cases and cannot be identified by naked eyes alone. Therefore, fingerprint recovery and reproduction at crime scenes is of paramount importance in forensic science. So far, researchers have developed several techniques and methods to visualize potential fingerprints,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/1172C09K11/06C09K11/02
CPCA61B5/1172C09K11/025C09K11/06C09K2211/1007C09K2211/1014C09K2211/1029C09K2211/1044C09K2211/1088C09K2211/1096
Inventor 唐本忠丘子杰郝红霞
Owner THE HONG KONG UNIV OF SCI & TECH