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Stickable flexible fingerprint display film, preparation method and application

A fingerprint and flexible technology, applied in the field of forensic science, can solve the problems of impermeable objects, rapid detection, and expansion of the scope of application, etc., and achieve the effect of stable display effect, fast display speed and low cost

Inactive Publication Date: 2020-08-18
ZHEJIANG POLICE COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method only improves the sensitivity of fingerprint display, and cannot expand its scope of application. It is only suitable for permeable objects, and cannot be used for non-permeable objects.
On the other hand, it takes a long time to appear, and requires the cooperation of large-scale equipment, which cannot meet the requirements of on-site rapid detection

Method used

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  • Stickable flexible fingerprint display film, preparation method and application
  • Stickable flexible fingerprint display film, preparation method and application
  • Stickable flexible fingerprint display film, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Put 0.35g of silver nitrate in a beaker, mix 18ml of acetone and 20ml of ethanol, pour it into the beaker filled with silver nitrate, and place it on an ultrasonic oscillator to vibrate for 15 minutes. This mixture is marked as developer A.

[0019] 2) Put 0.5 g of solid ninhydrin in a beaker, mix it with 10 ml of acetone and 10 ml of ethyl acetate solution, pour it into the beaker containing ninhydrin, and stir it with a glass rod until there is no precipitation at the bottom of the beaker. This mixture is marked For developer solution B.

[0020] 3) Mix developing solution A and developing solution B with the same volume in milliliters, and slowly add developing solution A to developing solution B dropwise to prepare a composite developing solution.

[0021] 4) Dilute the prepared composite display solution at 20 μl / cm 2 Evenly add the concentration of 100% to the viscous side of the scotch tape and let it dry naturally for 10 minutes to produce a sticky flexible ...

Embodiment 2

[0024] 1) Put 0.5g of silver nitrate in a beaker, mix 17ml of acetone and 22ml of ethanol, pour it into the beaker filled with silver nitrate, and place it on an ultrasonic oscillator to vibrate for 18 minutes. This mixture is marked as developer solution A.

[0025] 2) Put 0.45g of solid ninhydrin in a beaker, mix 13ml of acetone and 13ml of ethyl acetate solution, pour it into the beaker containing ninhydrin, and stir it with a glass rod until there is no precipitation at the bottom of the beaker. This mixture is marked For developer solution B.

[0026] 3) Mix developing solution A and developing solution B with the same volume in milliliters, and slowly add developing solution A to developing solution B dropwise to prepare a composite developing solution.

[0027] 4) Dilute the prepared composite display solution at 20 μl / cm 2 Evenly drop the concentration of the transparent tape onto the sticky side of the scotch tape, and let it dry naturally for 15 minutes to prepare a...

Embodiment 3

[0030] 1) Put 0.65g of silver nitrate in a beaker, mix 19ml of acetone and 24ml of ethanol, pour it into the beaker filled with silver nitrate, and place it on an ultrasonic oscillator to vibrate for 18 minutes. This mixture is marked as developer A.

[0031] 2) Put 0.45g of solid ninhydrin in a beaker, mix 14ml of acetone and 14ml of ethyl acetate solution, pour it into the beaker containing ninhydrin, and stir it with a glass rod until there is no precipitation at the bottom of the beaker. This mixture is marked For developer solution B.

[0032] 3) Mix developing solution A and developing solution B with the same volume in milliliters, and slowly add developing solution A to developing solution B dropwise to prepare a composite developing solution.

[0033] 4) Dilute the prepared composite display solution at 22 μl / cm 2 Evenly drop the concentration of the transparent tape onto the sticky side of the scotch tape, and let it dry naturally for 15 minutes to prepare a flexibl...

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Abstract

The invention discloses a stickable flexible fingerprint display film and a preparation method and application thereof. Silver nitrate is dissolved in a mixed solution of acetone and ethanol to obtaina developing solution A; ninhydrin is dissolved in a mixed solution of acetone and ethyl acetate to obtain a developing solution B; and the developing solution A and the developing solution B which are equal in volume are mixed to obtain a composite developing solution, and the composite developing solution is uniformly dropwise added to the sticky surface of a transparent adhesive tape and naturally dried to obtain the stickable flexible fingerprint display film. The stickable flexible fingerprint display film has the advantages of being simple in preparation method, low in cost, convenientto carry, high in display speed, suitable for various common and difficult objects such as permeable objects and impermeable objects, planar and curved objects, horizontally-placed objects and non-horizontally-placed objects, movable objects and immovable objects, and the like.

Description

technical field [0001] The invention belongs to the field of forensic science, and in particular relates to a stickable flexible fingerprint display film, a preparation method and an application. Background technique [0002] Fingerprint visualization is an important research content in the field of forensic science and public security technology. The chemical reagent display method is a commonly used fingerprint display method suitable for permeable objects. It mainly uses reagents such as silver nitrate or ninhydrin as a developer to react with the substances left in the fingerprint on the surface of the object to display fingerprints. Wire. However, the amino acids in sweat are easy to diffuse, so that the lines are easy to blur when the ninhydrin reagent is displayed, and the contrast is weak, while the silver nitrate is easily affected by the environment when it is displayed, the display effect is unstable, and it is prone to overexposure, which affects the display eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/1172
CPCA61B5/1172
Inventor 周婧郑铖剑尹建斌项苏杰叶浩斌
Owner ZHEJIANG POLICE COLLEGE
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