Fingerprint developing powder as well as preparation method and application thereof

A fingerprint and magnetic powder technology, applied in applications, medical science, sensors, etc., can solve the problems of good display effect, high price, carcinogenicity, etc., and achieve the effect of simple preparation process, wide source, and not easy to raise dust.

Pending Publication Date: 2022-01-14
SHENYANG LIGONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Yellow developing powder, inorganic powder using nano gold or copper, (Enhancement of Image Contrast, Stability, and SALDI-MS Detection Sensitivity for Latent Fingerprint Analysis by Tuning the Composition of Silver-Gold Nanoalloys, ACS Appl.Mater.Interfaces 2016,8,29668- 29675), the display effect is good, but the price is expensive, but the use of various colors of lead chromate, there is heavy metal pollution
Organic yellow dyes, such as tartrazine and sulfonamide quercetin, have a good visual effect, but small particles of organic dust also have the carcinogenic effect of organic matter
[0006] To sum up, the black display powder mainly has uneven mixing and poor dispersion of nanoparticles, which affects the display effect. The titanium oxide and aluminum oxide in the white display powder also have problems. The color display powder except phosphor powder is mainly in the white powder. Adding dyes also has interface problems

Method used

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  • Fingerprint developing powder as well as preparation method and application thereof
  • Fingerprint developing powder as well as preparation method and application thereof
  • Fingerprint developing powder as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] In this embodiment, a black fingerprint revealing powder is prepared, and the specific preparation process is as follows:

[0058] Weigh 4.5 grams of iron powder with an average particle size of 200 μm, 0.45 grams of 3.5 μm ferric oxide, and 0.01 gram of 5 μm graphite; weigh 0.18 grams of pentaerythritol, dissolve it with 15 ml of methanol at room temperature, and set aside; pour the iron powder into the stirring device , add a citric acid solution with a concentration of 2% to cover the surface of the magnetic powder, start stirring at 100-220rpm, stir for 10-15min, stop stirring and filter, rinse the filter cake with absolute ethanol or methanol for more than three times, take out the filter cake, and put it under nitrogen Drying in the atmosphere completes the iron powder modification. Pour the modified iron powder into the pentaerythritol solution, ultrasonicate for 10 minutes, and volatilize the solvent while stirring in the rotary steamer until the magnetic powder...

Embodiment 2

[0065] In this example, a black-gray fingerprint powder is prepared, and the specific preparation process is as follows:

[0066] Weigh 4.5 grams of nickel powder with an average particle size of 200 μm and 0.4 grams of graphite with a diameter of 5 μm; dissolve 0.18 grams of pentaerythritol with 15 milliliters of methanol at room temperature and set aside; pour the nickel powder into the stirring device, and add a 2% citric acid solution to cover On the surface of the magnetic powder, start stirring at 100-220rpm, stir for 10-15min, stop stirring and filter, rinse the filter cake with absolute ethanol or methanol for more than three times, take out the filter cake, and dry in a nitrogen atmosphere to complete the iron powder modification. Pour the modified iron powder into the pentaerythritol solution, ultrasonicate for 10 minutes, and volatilize the solvent while stirring in the rotary steamer until the magnetic powder and the binder form a paste slurry; take out the paste sl...

Embodiment 3

[0070] In this example, a white fingerprint revealing powder is prepared, and the specific preparation process is as follows:

[0071]Weigh 4.5 grams of iron powder with an average particle size of 200 μm, 0.45 grams of titanium oxide of 80 nm; 0.18 grams of erythritol, dissolve it with 15 milliliters of methanol at room temperature, and set aside; pour the iron powder into the stirring device, and add 2% lemon The acid solution has not passed the surface of the magnetic powder, start stirring at 100-220rpm, stir for 10-15min, stop stirring and filter, rinse the filter cake with absolute ethanol or methanol for more than three times, take out the filter cake, and dry in a nitrogen atmosphere to complete the transformation of iron powder sex. Pour the modified iron powder into the solution dissolved in erythritol, ultrasonicate for 10 minutes, and volatilize the solvent while stirring in a rotary steamer until the magnetic powder and binder form a paste slurry; take out the pas...

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Abstract

The invention discloses fingerprint developing powder as well as a preparation method and an application thereof. The fingerprint developing powder is prepared from the following components in percentage by weight: 92-95% of magnetic powder, 3-8% of binder and 0.5-1% of coloring agent. Compared with the prior art, the fingerprint developing powder has the advantages of clear color development on non-permeable carriers, no blockage to sweat pores and outlines, high adsorption capacity and development of fingerprints after simple wiping. Raw materials used in the fingerprint developing powder are wide in sources, green and non-toxic, not prone to raising dust during use. The preparation method is simple, and suitable for engineering production, and has great practical application values.

Description

technical field [0001] The invention relates to the technical field of fingerprint display materials, in particular to a fingerprint display powder and its preparation method and application. Background technique [0002] Fingerprints are the protruding lines on the skin of human fingers. They are a kind of genetic traits of human beings. They have the characteristics of "different from person to person and basically unchanged throughout life". Due to its uniqueness, lifelong invariance and convenience, fingerprints have become an important means of biometric identification. When the finger is in contact with the object, the sweat, oil and other components in the finger will remain on the surface of the object, forming fingerprints that are invisible to the naked eye, that is, latent fingerprints. Studies have found that the main components of latent fingerprints are 99% water, which will evaporate quickly; about 50% of the remaining substances are inorganic components (suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/1172
CPCA61B5/1172
Inventor 马丽姜夏冰陈帅张文正张加伟黎俊良赵缘宇田巍
Owner SHENYANG LIGONG UNIV
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