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Preparation method of in-situ polymerized ninhydrin/polyvinyl alcohol nano-fiber composite film and fingerprint detecting method

A polyvinyl alcohol and nanofiber technology, applied in fiber processing, fiber chemical characteristics, diagnostic recording/measurement, etc., to achieve the effects of no toxic side effects, fast and convenient process, and wide application range

Active Publication Date: 2019-04-26
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention solves the deficiencies and problems in the above-mentioned prior art, provides a preparation method of in-situ polymerized ninhydrin / PVA nanofiber composite film, and solves the problems of electrospinning nanofiber film and fingerprint detection in the prior art. method

Method used

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  • Preparation method of in-situ polymerized ninhydrin/polyvinyl alcohol nano-fiber composite film and fingerprint detecting method
  • Preparation method of in-situ polymerized ninhydrin/polyvinyl alcohol nano-fiber composite film and fingerprint detecting method
  • Preparation method of in-situ polymerized ninhydrin/polyvinyl alcohol nano-fiber composite film and fingerprint detecting method

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Effect test

Embodiment 1

[0047]Dissolve PVA in deionized water, prepare 80 ml of 10 wt % PVA aqueous solution, and stir at 90° C. until the solution is transparent. Prepare 20ml of ninhydrin aqueous solution of 25wt%, uniformly mix 20ml ninhydrin aqueous solution and 80ml PVA aqueous solution on a magnetic stirrer, obtain PVA / ninhydrin composite solution, PVA content is 8% in the composite solution, ninhydrin content 5%. According to the molar ratio of glutaraldehyde and HCl being 5:1, hydrochloric acid and glutaraldehyde were mixed at room temperature, and stirred evenly to obtain a glutaraldehyde / HCl composite solution. According to the molar ratio of glutaraldehyde to PVA being 0.01:90, the PVA / ninhydrin composite solution and the glutaraldehyde / HCl composite solution are mixed before spinning to obtain a spinning solution. The spinning solution is electrospun with needle-free electrospinning equipment, the electrospinning voltage is 80kV, the solution box speed is 120mm / s, and the spinning time i...

Embodiment 2

[0050] Dissolve PVA in deionized water, prepare 80 ml of 10 wt % PVA aqueous solution, and stir at 90° C. until the solution is transparent. Prepare 20ml of ninhydrin ethanol solution of 25wt%, uniformly mix 20ml ninhydrin ethanol solution and PVA aqueous solution on a magnetic stirrer, obtain PVA / ninhydrin composite solution, PVA content is 8% in the composite solution, ninhydrin The content is 5%. According to the molar ratio of glutaraldehyde to HCl being 5:1, hydrochloric acid and glutaraldehyde were mixed at room temperature and stirred to obtain a glutaraldehyde / HCl composite solution. According to the molar ratio of glutaraldehyde to PVA being 0.01:90, the PVA / ninhydrin composite solution and the glutaraldehyde / HCl composite solution are mixed before spinning to obtain a spinning solution. The spinning solution is electrospun with needle-free electrospinning equipment, the electrospinning voltage is 80kV, the solution box speed is 120mm / s, and the spinning time is 60mi...

Embodiment 3

[0053] Dissolve PVA in deionized water, prepare 80 ml of 12.5 wt % PVA aqueous solution, and stir at 90° C. until the solution is transparent. Prepare 20ml of ninhydrin aqueous solution of 35wt%, 20ml ninhydrin ethanol solution and PVA aqueous solution are uniformly mixed on magnetic stirrer, obtain PVA / ninhydrin composite solution, PVA content is 10% in the composite solution, ninhydrin content 7%. According to the molar ratio of glutaraldehyde and HCl being 5:1, hydrochloric acid and glutaraldehyde were mixed at room temperature, and stirred evenly to obtain a glutaraldehyde / HCl composite solution. According to the molar ratio of glutaraldehyde to PVA being 1:90, the PVA / ninhydrin composite solution and the glutaraldehyde / HCl composite solution were mixed before spinning to obtain a spinning solution. At needle electrospinning equipment voltage 20kV, solution extruding speed 0.5ml / h, spinning time 200min, needle model (No. 17), distance 20cm between spinneret (needle) and r...

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Abstract

The invention discloses a preparation method of an in-situ polymerized ninhydrin / polyvinyl alcohol nano-fiber composite film and a fingerprint detecting method. The preparation method comprises the following steps: compounding hydrochloric acid, glutaraldehyde, polyvinyl alcohol and ninhydrin into a spinning solution according to a certain molar ratio, and supporting the ninhydrin on a nano-fiberfilm by virtue of electrostatic spinning, thereby obtaining the in-situ cross-linked nano film material. Fingerprints can be clearly, sensitively and rapidly extracted. The nano fiber film disclosed by the invention has large specific surface area and can interact with amino acids in sweat, and the aim of displaying the fingerprints is achieved.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to a material for processing a fingerprint recognition and a fingerprint recognition method. It can be applied to the fields of nanometer material analysis technology and fingerprint detection technology. Background technique [0002] Fingerprints are the bumps in the skin on the belly of the fingertips. The latent fingerprint refers to the finger folds and concave-convex patterns left on the object surface after the finger touches the object. These patterns cannot be recognized by the naked eye objectively, and need to undergo certain processing methods to show the original appearance, so they are called latent fingerprints. Due to the uniqueness and invariance of individual fingerprints, fingerprint identification will become the most attractive means of identification. Usually, after the fingerprint is printed, there are few substances left on the surface of the object...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/4382D04H1/728D01D5/00D01F1/10D01F6/50A61B5/1172
CPCA61B5/1172D01D5/003D01D5/0061D01D5/0092D01F1/10D01F6/50D04H1/4382D04H1/728
Inventor 王迎周千熙杜梦扬王怡婷
Owner DALIAN POLYTECHNIC UNIVERSITY
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