Occult blood fingerprint appearing agent, occult blood fingerprintappearing cotton piece and application ofoccult blood fingerprintappearing cotton piece

A technique of revealing agent and fingerprint, which is applied in the field of fingerprint revealing, can solve the problems of unsuitable occult blood fingerprint revealing, low fluorescence quantum yield, etc., and achieve the effects of clear revealing effect, convenient and simple operation process, and portability

Active Publication Date: 2020-01-17
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The literature also reported an aminated polyphenylene acetylene fluorescent conjugated polymer (see literature: J. Mater. Chem. C, 2017, 5, 5010-5017), but due to its water solubility and low fluorescence quantum yield , not suitable for occult blood fingerprint display

Method used

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  • Occult blood fingerprint appearing agent, occult blood fingerprintappearing cotton piece and application ofoccult blood fingerprintappearing cotton piece
  • Occult blood fingerprint appearing agent, occult blood fingerprintappearing cotton piece and application ofoccult blood fingerprintappearing cotton piece
  • Occult blood fingerprint appearing agent, occult blood fingerprintappearing cotton piece and application ofoccult blood fingerprintappearing cotton piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This embodiment provides an aminated polyphenylene acetylene fluorescent conjugated polymer and a preparation method thereof.

[0048] In this example, the synthesis of M1 can be found in the literature (J. Mater. Chem. C, 2017, 5, 5010-5017), and the synthesis of M2 can be found in the literature (ACS Appl. Mater. Interface, 2014, 6, 5041– 5049).

[0049] The structural formula of monomer M1 is

[0050]

[0051] The structural formula of monomer M2 is

[0052]

[0053] see attached figure 1 , the preparation of PPE-NBoc precursor: under the protection of argon, monomer M1 (0.284 g, 0.5 mmol), monomer M2 (0.307 g, 0.05 mmol), (PPh 3 ) 2 PdCl 2 (0.035 g, 0.05 mmol) and CuI (5 mg, 0.025 mmol) were added to a pre-dried flask, and then 8 mL of anhydrous tetrahydrofuran and 2 mL of anhydrous diisopropylamine were added. Under the protection of argon, stir at reflux at 60°C for 14h. After the reaction, the reactant was cooled to room temperature, filtered with a...

Embodiment 2

[0058] This embodiment provides an aminated polyphenylene acetylene fluorescent conjugated polymer PPE-NH 3 + Fingerprint developing agent and loaded PPE-NH 3 + The preparation method of the revealed cotton sheet, concrete steps are as follows:

[0059] 1. PPE-NH 3 + Preparation of fingerprint revealing agent: take polymer PPE-NH 3 + (0.0129 g, 0.015 mmol), DMF (5mL) in a 10 mL centrifuge tube, after the solid was completely dissolved, 5 mL of PPE-NH 3 + Fingerprint revealer.

[0060] 2. Cut the cotton non-woven fabric to a size of 2cm×3cm.

[0061] 3. Take 300 μL of the developing agent prepared in step 1 in a weighing bottle, immerse 2 cut cotton pieces in the developing agent, soak for 1 min, and take it out. The cotton pieces are wet, and the loaded PPE-NH 3 + The fingerprint revealing cotton sheet of the fingerprint revealing agent.

[0062] 4. Seal the display cotton piece in a plastic bag and store it in a cool and dry place.

Embodiment 3

[0064] This example provides a fresh occult blood fingerprint on the surface of the aluminum foil object, using the loaded PPE-NH prepared in Example 2 3 + The fingerprint revealing cotton sheet of the fingerprint revealing agent is used for revealing occult blood fingerprints to obtain fingerprint pictures under ultraviolet light. The specific steps are as follows:

[0065] 1. Put the aluminum foil object loaded with fresh occult blood fingerprints in a cool and dry place for 24 hours;

[0066] 2. Take a piece of loaded PPE-NH prepared in Example 2 3 + The fingerprint revealing cotton sheet of the fingerprint revealing agent is evenly covered on the aluminum foil object loaded with occult blood fingerprints, gently press to ensure that the cotton sheet is in full contact with the object, and stand for 2 minutes;

[0067] 3. Peel off the cotton piece from the aluminum foil smoothly, after drying, take pictures under 415nm light to obtain the blood occult fingerprints displa...

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Abstract

The invention discloses an occult blood fingerprint appearing agent, an occult blood fingerprintappearing cotton piece and application oftheoccult blood fingerprint appearing cotton piece. A polyphenylene ethynylene type conjugated polymer with amino on the side chain protected by t-butyloxycarboryl is synthesized through an Sonogashira coupling reaction, theprotecting group is removed through trifluoroacetic acid, and an aminated polyphenylene ethynylene fluorescence conjugated polymer is obtained and is dissolved in a solvent, so that the occult blood fingerprint appearing agent is obtained.A non-woven fabric is adopted as a basematerial and is soaked through the fingerprint appearing agent, so that the occult blood fingerprint appearing cotton piece is obtained; the cotton piece coversan object loaded with an occult blood fingerprint; and after uncovering the cotton piece, bright fingerprint lines can be observed under ultraviolet light of 415nm. According to the technical scheme,the occult blood fingerprint appearing agent provided by the invention is simple and convenient to operate, short in developing time, good in developing effect, and suitable for occult blood fingerprint developing on different objects; and particularly, by adopting the appearing cotton piece, the appearing cotton piece is portable, reusable, capable of realizing industrial production, and suitablefor occult blood fingerprint appearing of objects in various dimensions on sites with different situations.

Description

technical field [0001] The present invention relates to a fingerprint display technology, in particular to a blood occult fingerprint display agent based on aminated polyphenylene acetylene fluorescent conjugated polymer, a preparation method, and the fingerprint display of blood occult fingerprints on different objects by using the cotton method The method belongs to the application field of polymer fluorescent materials. Background technique [0002] Fingerprint is one of the important physical evidence in forensic science. It has the characteristics of being different from person to person, leaving marks on objects touched, and basically unchanged throughout life. In most violent crime scenes, blood is involved, and blood fingerprints at a crime scene contain a lot of information and are very strong physical evidence that can identify the criminal. Occult blood fingerprints invisible to the naked eye are often overlooked by criminals and can provide great help in case in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G61/02A61B5/1172
CPCC08G61/02A61B5/1172C08G2261/124C08G2261/312C08G2261/3328
Inventor 范丽娟樊智楠马荣梁
Owner SUZHOU UNIV
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