CN101477058B - Method for using silicon dioxide and polystyrene functionalized particle in hidden fingerprint appearance - Google Patents
Method for using silicon dioxide and polystyrene functionalized particle in hidden fingerprint appearance Download PDFInfo
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- CN101477058B CN101477058B CN2009100664938A CN200910066493A CN101477058B CN 101477058 B CN101477058 B CN 101477058B CN 2009100664938 A CN2009100664938 A CN 2009100664938A CN 200910066493 A CN200910066493 A CN 200910066493A CN 101477058 B CN101477058 B CN 101477058B
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Abstract
The invention belongs to the technical field of detection, and particularly relates to a method for potential fingerprint manifestation on different surfaces by silicon dioxide, polystyrene micron glueballs and the functional micron particles of the silicon dioxide and the polystyrene micron glueballs. The invention provides a method for manifesting potential fingerprints on surfaces of glass, plastic, metal, composite boards (lacquer wood), paper, and so on, by the silicon dioxide, polystyrene and the functionalized micron particles thereof. Silicon dioxide particles and fluorescent silicon dioxide modified by various dye molecules are improved and synthesized by a classical stober method (size can be within the range of between 10 and 100 microns), silicon dioxide microspheres are taken as template to prepare microspheres of a nuclear shell structure; and monodisperse glueballs of the polystyrene are prepared by an emulsion polymerization method, and a dry powder brush development method and a wet method are used for manifestation. The method is simple, quick and easy to operate, does not contain toxic constituents, has safe use and high sensitivity, and can realizethe manifestation of old fingerprints.
Description
Technical field
The invention belongs to the detection technique field, be specifically related to the preparation of silicon dioxide and polystyrene micron glueballs and functionalization micron particles thereof and be used for the method for different surfaces developing latent finger prints using.
Background technology
Fingerprint plays important evidential function in forensic science and criminal suit process.Yet in all kinds of crime cases, the crime means that the offender adopts is more and more insidious, hidden more.The fingerprint that occurs in the scene of a crime often is potential, needs could observe its texture structure with some process for show.Therefore, the evaluation fingerprint is correctly found, extracts, manifested to science, for the investigation of case with punish crime, has important practice effect and immeasurable social value.
1877, Charles Robert Richet Aubert utilized silver nitrate to manifest since the sweat fingerprint in the paper delivery, and fingerprint manifestation has become the professional technique of subject knowledges such as an integrated use physics, chemistry, biology and technology.Being applied to on-the-spot biological trace method for visualizing at present mainly contains: optics appearance method, physics appearance method and chemical appearance method, many metals deposition appearance method etc.Wherein photoluminescence method is started from 1976 as the research of developing latent finger prints using.For the organic components in the laten fingerprints, as grease, amino acid etc., under considerable situation, the process for show that requires to adopt should possess extra high sensitivity.Though there have been a lot of appearing techniques, research and development nontoxic and the on-the-spot biological trace appearing technique of high sensitivity still are the emphasis of forensic science research and countries in the world criminal technique personnel's striving direction.
Frederick J.Rowell utilizes tetraethoxysilane (or tetramethoxy-silicane) and the reaction of phenyl triethoxysilane mixed hydrolysis, and the common reaction of addings such as dyestuff obtained hydrophobic silica dioxide granule, be used to detect fingerprint and obtained good effect [Brenden J.Theaker, Katherine E.Hudson, Frederick J.Rowell, Forensic Sci.Int.2008,174,26-34].Kwan H.Cheng is with Eu
3+Ion doping silicon dioxide forms compound, utilizes fluorescent appear laten fingerprints [Li Liu, Simerjeet K.Gill, Yanping Gao, Louisa J.Hope-Weeks, Kwan H.Cheng a, Forensic Sci.Int.2008,176,163-172].
Summary of the invention
The objective of the invention is to prepare silicon dioxide and polystyrene and functionalization micron particles thereof, realize method different objects surface developing latent finger prints using.
The present invention adopts classical
Method is also improved, and utilizes TEOS one step of hydrolysis synthetic silica list under alkali condition to disperse the fluorescent silicon dioxide glueballs of glueballs or dopant dye, or to disperse glueballs at the silicon dioxide list be the nucleocapsid structure of template preparation.The present invention also utilizes emulsion polymerization to prepare polystyrene list dispersion glueballs.And use above material, soak the laten fingerprints that manifests different surfaces by apparent method of dry powder brush and wet method respectively.
Silicon dioxide microsphere powder and nucleocapsid structure thereof:
Synthetic silicon dioxide microsphere of (one) one step
1, the preparation of monodisperse silica microspheres powder: the ethyl orthosilicate (being tetraethoxysilane TEOS) of preparation 2ml-10ml adds in the 15ml-50ml ethanolic solution (solution one), ammoniacal liquor with 5-20ml, 10-30ml ethanol, the mixed solution of 2-10ml water (solution two) is under the normal temperature, two solution mix rapidly under electronic stirring fast, react after 2-20 hour, the product that obtains is centrifugal, and clean with secondary water, oven dry just obtains white silicon dioxide microsphere powder.The big I of silicon dioxide microsphere particle diameter is by TEOS in the solution, ammoniacal liquor, and the difference of the ratio of water is regulated, and the range of size that obtains can be between the 10-100 micron.
During use, dip in small quantities of powder with hairbrush, stencil the various surfaces of laten fingerprints gently, comprise glass sheet, plastic bottle, pop can, copper sheet, aluminium foil, desk or experiment table surface, promptly can be observed the white fingerprint lines that manifests, taking pictures to fetch data with digital camera gets final product.
Also available solwution method manifests, the powder of a certain amount of (mass volume ratio W/V is 0.5-3%) is put into water, add small amount of ethanol, ultrasonic 2-3 minute, the sample that will be printed on laten fingerprints is put into dispersion liquid and is soaked, take out after 5-20 minute and dry, can see the clear showing finger print image, taking pictures to fetch data with digital camera gets final product.
2, fluorescent silicon dioxide ball, the preparation of the silicon dioxide microsphere powder of coating dye molecule is an example with rhodamine B (RB), luxuriant safflower red (ST):
0.02-1g dye molecule (with rhodamine B, luxuriant safflower is red is example) is dissolved in 2-18ml water, add 10-35ml ethanol and 8-15ml ammoniacal liquor and be mixed with mixed solution (solution one), the ethanolic solution (solution two) that the TEOS of 2ml-10ml is added 15-50ml, under electronic stirring condition, two solution are mixed rapidly, react after 2-20 hour, the product that obtains is centrifugal, and with the cleaning of secondary water, dry, obtain coating the fluorescent silicon dioxide microballoon powder (RB/SiO of dye molecule
2, ST/SiO
2).The big I of silicon dioxide microsphere particle diameter is by TEOS in the solution, ammoniacal liquor, and the difference of the ratio of water is regulated, and the grain size that obtains can be at the 10-100 micrometer range.Adopt
One step of method is synthetic, and dye molecule directly is coated on monodisperse silica microspheres inside, becomes the fluorescent silicon dioxide microballoon, and dye molecule can be selected according to different requirements.
During use, dip in small quantities of powder with hairbrush, stencil the various surfaces of laten fingerprints gently, comprise glass sheet, plastic bottle, pop can, copper sheet, aluminium foil, desk or experiment table surface, promptly can be observed the fingerprint lines that manifests, taking pictures to fetch data with digital camera gets final product.Contrast close situation on the surface with powder, after manifesting with powder, under ultraviolet source irradiation, can be observed luminous clearly striped, the residual certificate of can under ultraviolet source, taking pictures.When manifesting with wet method, the powder of a certain amount of (mass volume ratio W/V is 0.5-3%) is put into water, add small amount of ethanol, ultrasonic dispersion 2-3 minute, the sample that will be printed on laten fingerprints is put into dispersion liquid and is soaked, take out after 5-20 minute and dry, can see the clear showing finger print image, taking pictures to fetch data with digital camera gets final product.
(2) the silicon dioxide microsphere powder of nucleocapsid structure:
1, the preparation of nucleocapsid structure fluorescent silicon dioxide microballoon powder, dye molecule are with rhodamine B (RB), and luxuriant safflower red (ST) is an example:
Will
The ultrasonic 50ml that is distributed to of silicon dioxide microsphere 2-10g of method preparation, the ethanolic solution of the rhodamine B of 0.01-1M/L (RB); The titanium tetrachloride solution that contains HCl that adds 0.1-1M/L under magnetic agitation effect and 50-80 ℃ of condition of water bath heating, reaction 1-5 hour, centrifugal then, washing obtain SiO for several times after the oven dry
2/ RB/TiO
2The microballoon powder of nucleocapsid structure.The titania shell can prevent effectively that the dye coating of microsphere surface from leaking.Other dyestuff of luxuriant safflower red (ST) dye well can prepare SiO with this method equally
2/ dyestuff/TiO
2The microballoon of nucleocapsid structure.
During use, dip in small quantities of powder with hairbrush, stencil the various surfaces of laten fingerprints gently, comprise glass sheet, plastic bottle, pop can, copper sheet, aluminium foil, paper, desk or experiment table surface, promptly can be observed the fingerprint lines that manifests, taking pictures with digital camera gets final product.Under ultraviolet source irradiation, can be observed luminous clearly striped, the residual certificate of can under ultraviolet source, taking pictures.When manifesting with wet method, the powder of a certain amount of (mass volume ratio W/V is 0.5-3%) is put into water, add small amount of ethanol, ultrasonic dispersion 2-3 minute, the sample that will be printed on laten fingerprints is put into dispersion liquid and is soaked, take out after 5-20 minute and dry, can see the clear showing finger print image, taking pictures to fetch data with digital camera gets final product.
2, the nucleocapsid silicon dioxide microsphere (SiO of silver coating
2/ Ag)
Will
The silicon dioxide microsphere 5-15g of method preparation is distributed in the 10-30ml ethanol, and continues ultrasonic 5 minutes.Silver-colored ammonium salt solution [Ag (NH with the new preparation of 5-20ml
3)
2 +] mix stirring with silica dispersions, the aqueous solution that contains the 0.01-0.05g sodium borohydride with 0.5-5ml is reduced, and continuation was stirred 1-5 hour, and centrifuging is also cleaned with secondary water after treating fully to react, and just makes SiO after the baking
2/ Ag powder.Grind the back powder and be light grey.The brush that can be directly used in laten fingerprints on white or the light-colored surface shows, particularly Qian Se desktop.
During use, dip in small quantities of powder with hairbrush, stencil the various surfaces of laten fingerprints gently, comprise glass sheet, plastic bottle, pop can, copper sheet, aluminium foil, desk or experiment table surface, promptly can be observed the fingerprint lines that manifests, taking pictures with digital camera gets final product.When manifesting with wet method, the powder of a certain amount of (mass volume ratio W/V is 0.5-3%) is put into water, add small amount of ethanol, ultrasonic dispersion 2-3 minute, the sample that will be printed on laten fingerprints is put into dispersion liquid and is soaked, take out after 5-20 minute and dry, can see the clear showing finger print image, taking pictures to fetch data with digital camera gets final product.
Polystyrene (PS) mono-dispersion microballoon and PS/Ag nucleocapsid structure:
1, the single PS of dispersion glueballs preparation: adopt the emulsion polymerization technology of emulsifier-free synthetic.Join 300-600mL water in the three-neck flask and be heated to 70 ℃, 33-66mL 0.1-0.5M, the styrene that NaOH and distilled water were alternately washed adds wherein; Slowly feed nitrogen and remove the oxygen that is dissolved with in the solution.0.1-0.5g initiating agent K
2S
2O
8Separate and be heated to 70 ℃ with 10-40mL is water-soluble, be added drop-wise to then in the above styrene aqueous solution, continue logical nitrogen 30-50min, the gained potpourri stirred 24-28 hour under 200-400 changes, and temperature is controlled at 50-70 ℃ in this process.After reaction finishes, the emulsion that obtains is filtered removing the agglomerate of all bulks with glass fiber, centrifuging then, product places drying at room temperature, the white PS powder that obtains, microspherulite diameter is about 300-800nm.
During use, dip in small quantities of powder with hairbrush, stencil the various surfaces of laten fingerprints gently, comprise glass sheet, plastic bottle, pop can, copper sheet, aluminium foil, desk or experiment table surface, promptly can be observed the fingerprint lines that manifests, taking pictures with digital camera gets final product.When manifesting with wet method, the powder of a certain amount of (mass volume ratio W/V is 0.5-3%) is put into water, add small amount of ethanol, ultrasonic dispersion 2-3 minute, the sample that will be printed on laten fingerprints is put into dispersion liquid and is soaked, take out after 5-20 minute and dry, can see the clear showing finger print image, taking pictures to fetch data with digital camera gets final product.
2, the microballoon of PS/Ag nucleocapsid structure:
The PS glueballs is got a certain amount of being distributed in the phosphate buffer solution, then, the aqueous solution of polyetherimide (PEI) is added wherein, the mass ratio of PEI and PS is about 1/2, after stirring 1-2 hour under the room temperature, the centrifuging white solid washes twice with water and obtains the PS glueballs that PEI modifies.The PS glueballs that 1-8g PEI modifies is distributed in the 10-80ml water, will contain 20-50ml then and contain 0.1-0.8g AgNO
3Water mix with above-mentioned solution.After stirring 5-20min under the room temperature, centrifuging obtains the PS/PEI/Ag compound.The 0.5-3g solid dispersed in 50-200ml water, is warming up to 80-120 ℃, and behind the reaction 1-3h, centrifuging, washing obtain PS/Ag nucleocapsid structure microballoon.
During use, dip in small quantities of powder with hairbrush, stencil the various surfaces of laten fingerprints gently, comprise glass sheet, plastic bottle, pop can, copper sheet, aluminium foil, desk or experiment table surface, promptly can be observed the fingerprint lines that manifests, taking pictures with digital camera gets final product.When manifesting with wet method, the powder of a certain amount of (mass volume ratio W/V is 0.5-3%) is put into water, add small amount of ethanol, ultrasonic dispersion 2-3 minute, the sample that will be printed on laten fingerprints is put into dispersion liquid and is soaked, take out after 5-20 minute and dry, can see the clear showing finger print image, taking pictures to fetch data with digital camera gets final product.
The present invention has following advantage:
1, method is simple, quick, easy to operate, can be apparent in the laten fingerprints on the surface (glass sheet, plastic bottle, pop can, copper sheet, aluminium foil, paper, desk or experiment table) of various quality, can realize manifesting of outmoded laten fingerprints.
2, not by instrument (bore hole observation) can discern and manifest laten fingerprints; All obtain manifests fingerprint and can directly take pictures under natural light and fetch data, and some powder can be luminous under the ultraviolet source of specific wavelength, can be used for the manifesting of laten fingerprints on the surface of particular substrate.
3, the present invention easily prepares and preserves; Cost is low, and consumption is few during use.
4, the present invention does not contain poisonous composition, and is safe in utilization, and the operator is had no side effect.
Description of drawings
Accompanying drawing 1, be image with silicon dioxide microsphere significant powder brush glass surface laten fingerprints;
Accompanying drawing 2, be image with silicon dioxide microsphere significant powder brush plastic bottle surface laten fingerprints;
Accompanying drawing 3, be image with silicon dioxide microsphere significant powder brush antitheft door surface laten fingerprints;
Accompanying drawing 4, for fluorescent silicon dioxide microballoon powder (RB/SiO
2) brush shows the image of glass surface laten fingerprints;
Accompanying drawing 5, for fluorescent silicon dioxide microballoon powder (ST/SiO
2) brush shows the image of glass surface laten fingerprints;
Accompanying drawing 6, for fluorescent silicon dioxide microballoon powder (ST/SiO
2) wet method manifests the image of glass surface laten fingerprints;
Accompanying drawing 7, for nucleocapsid fluorescent silicon dioxide microballoon powder (SiO
2/ RB/TiO
2) brush shows the image of aluminium foil surface laten fingerprints;
Accompanying drawing 8, for nucleocapsid fluorescent silicon dioxide microballoon powder (SiO
2/ ST/TiO
2) wet method manifests the image of aluminium foil surface laten fingerprints;
Accompanying drawing 9, for silver bag silica core-shell microspheres (SiO
2/ Ag) brush shows the image of 10 days heavy old laten fingerprints of table surface;
Accompanying drawing 10, be image with polystyrene PS microballoon significant powder brush experiment table surface laten fingerprints;
Accompanying drawing 11, for silver bag silica core-shell microspheres (SiO
2/ Ag) brush shows the image of 20 days heavy old laten fingerprints of table surface;
Accompanying drawing 12, in 40 ℃ of baking ovens, dry by the fire the image of 3 days glass surface laten fingerprints with the silicon dioxide microsphere significant powder brush.
Embodiment
Embodiment 1:
(1) ammoniacal liquor of (solution one) and 12ml in ethyl orthosilicate (being tetraethoxysilane TEOS) the adding 20ml ethanolic solution of preparation 4ml, 25ml ethanol, the mixed solution of 2-5ml water (solution two);
(2) under the normal temperature, two solution mix rapidly under electronic stirring fast, react after 4-8 hour, and the product that obtains is centrifugal, and clean with secondary water, and oven dry just obtains white silicon dioxide microsphere powder.The big I of silicon dioxide microsphere particle diameter is by TEOS in the solution, ammoniacal liquor, and the difference of the ratio of water is regulated, and the grain size that obtains can be at the 10-100 micrometer range.
Process for show:
(1) dips in small quantities of powder with hairbrush, stencil the various surfaces of laten fingerprints gently, comprise glass sheet, plastic bottle, pop can, copper sheet, aluminium foil, desk or experiment table surface, promptly can be observed the white fingerprint lines that manifests, taking pictures to fetch data with digital camera gets final product (accompanying drawing 1,2,3);
(2) manifest with wet method, the powder of a certain amount of (mass volume ratio W/V is 0.5-3%) is put into water, add small amount of ethanol, ultrasonic 2-3 minute, the glass sheet that will be printed on laten fingerprints is put into dispersion liquid and is soaked, take out after 5-20 minute and dry, can see the clear showing finger print image, taking pictures to fetch data with digital camera gets final product.
Embodiment 2:
(1) 0.02g dye molecule (with rhodamine B, luxuriant safflower is red is example) is dissolved in 8ml water, adds 20ml ethanol and 12ml ammoniacal liquor and be mixed with mixed solution (solution one),
(2) TEOS of 4ml is added the ethanolic solution (solution two) of 15ml, under electronic stirring condition, two solution are mixed rapidly, react after 8 hours, the product that obtains is centrifugal, and clean with secondary water, dry, obtain the fluorescent silicon dioxide microballoon powder of monodispersed coating dye molecule.Can select other different dyestuff as required for use.
Process for show:
(1) dips in small quantities of powder with hairbrush, stencil the various surfaces of laten fingerprints gently, comprise glass sheet, plastic bottle, pop can, copper sheet, aluminium foil, desk or experiment table surface, promptly can be observed the fingerprint lines that manifests, taking pictures to fetch data with digital camera gets final product (accompanying drawing 4,5).Contrast close situation on the surface with powder, after manifesting with powder, under ultraviolet source irradiation, can be observed luminous clearly striped, the residual certificate of can under ultraviolet source, taking pictures;
When (2) manifesting with wet method, a certain amount of powder (mass volume ratio W/V is 0.5-3%) is put into water, add small amount of ethanol, ultrasonic 2-3 minute, the glass sheet that will be printed on laten fingerprints is put into dispersion liquid and is soaked, take out after 5-20 minute and dry, can see the clear showing finger print image, taking pictures to fetch data with digital camera gets final product (accompanying drawing 6).
Embodiment 3:
(1) 2g by
The ultrasonic 50ml that is distributed to of silicon dioxide microsphere of method preparation, the ethanolic solution of the rhodamine B of 0.01M/L (RB);
(2) add the titanium tetrachloride solution that contains HCl of 0.5M/L under magnetic agitation effect and 80 ℃ of condition of water bath heating, react 4 hours, centrifugal then, washing several obtains SiO after the oven dry
2/ RB/TiO
2The microballoon powder-product of nucleocapsid structure.Other dyestuff of luxuriant safflower red (ST) dye well can be used to prepare SiO equally
2/ dyestuff/TiO
2The microballoon powder of nucleocapsid structure.
Process for show:
(1) dips in small quantities of powder with hairbrush, stencil the various surfaces of laten fingerprints gently, comprise glass sheet, plastic bottle, pop can, copper sheet, aluminium foil, paper, desk or experiment table surface, promptly can be observed the fingerprint lines that manifests, taking pictures to fetch data with digital camera gets final product (accompanying drawing 7).Contrast close situation on the surface with powder, behind significant powder brush, under ultraviolet source irradiation, can be observed luminous clearly striped, the residual certificate of can under ultraviolet source, taking pictures;
When (2) manifesting with wet method, a certain amount of powder (mass volume ratio W/V is 0.5-3%) is put into water, add small amount of ethanol, ultrasonic 2-3 minute, the glass sheet that will be printed on laten fingerprints is put into dispersion liquid and is soaked, take out after 5-20 minute and dry, can see the clear showing finger print image, taking pictures to fetch data with digital camera gets final product (accompanying drawing 8).
Embodiment 4:
(1) becomes silica dispersions in the ultrasonic 10ml of the being distributed to ethanol of silicon dioxide microsphere 10g.
(2) with the new silver-colored ammonium salt solution [Ag (NH for preparing of 10ml
3)
2 +] mix stirring with silica dispersions, the aqueous solution that contains the 0.05g sodium borohydride with 1ml is reduced, and continuation was stirred 2 hours, and centrifuging is also cleaned with secondary water after treating fully to react, and just makes SiO after the baking
2/ Ag powder grinds the back powder and is light grey.
Process for show:
(1) dips in small quantities of powder with hairbrush, stencil the various surfaces of laten fingerprints gently, comprise glass sheet, plastic bottle, pop can, copper sheet, aluminium foil, paper, desk or experiment table surface, promptly can be observed the fingerprint lines that manifests, taking pictures with digital camera gets final product (accompanying drawing 9).
(2) or with the powder of a certain amount of (mass volume ratio W/V is 0.5-3%) put into water, add small amount of ethanol, ultrasonic dispersion 2-3 minute, the sample that will be printed on laten fingerprints is put into dispersion liquid and is soaked, take out after 5-20 minute and dry, can see the clear showing finger print image, taking pictures to fetch data with digital camera gets final product.
Embodiment 5:
(1) join 600mL water in the three-neck flask and be heated to 70 ℃, the styrene that 66mL alternately washed with NaOH and the distilled water of 0.1M adds wherein; Slowly feed nitrogen and remove the oxygen that is dissolved with in the potpourri.
(2) with 0.221g initiating agent K
2S
2O
8Separate and be heated to 70 ℃ with 34mL is water-soluble, be added drop-wise to then in the above styrene aqueous solution, continue logical nitrogen 30min, the gained potpourri stirs 24h under 245rpm, and temperature is controlled at 70 ± 2 ℃ in this process.
(3) after reaction finishes, the emulsion that obtains is filtered removing the agglomerate of all bulks with glass fiber, centrifuging then, product places drying at room temperature, and the PS glueballs particle diameter that obtains is about 600nm.
Process for show:
(1) dip in small quantities of powder with hairbrush, stencil the various surfaces of laten fingerprints gently, comprise glass sheet, plastic bottle, pop can, copper sheet, aluminium foil, desk or experiment table surface, promptly can be observed the fingerprint lines that manifests, taking pictures with digital camera gets final product (accompanying drawing 10).
(2) or with the powder of a certain amount of (mass volume ratio W/V is 0.5-3%) put into water, add small amount of ethanol, ultrasonic dispersion 2-3 minute, the sample that will be printed on laten fingerprints is put into dispersion liquid and is soaked, take out after 5-20 minute and dry, can see the clear showing finger print image, taking pictures to fetch data with digital camera gets final product.
Manifesting of heavy old fingerprint:
(1) stamp laten fingerprints respectively on glass sheet, plastic bottle, pop can, copper sheet, aluminium foil, desk or experiment table surface, the date of mark trace, after stamping fingerprint on the desk, mark approximate range and date;
(2) after 10-40 days, the sample that will be printed on laten fingerprints is brushed apparent gently with powder, obtain distinct image (accompanying drawing 11);
(3) or with the laten fingerprints sample be placed in the baking oven 30-60 ℃ of baking 10-40 hour, take out the back and uses significant powder brush, can obtain distinct image (accompanying drawing 12);
(4) be distributed in a certain proportion of water and the ethanol mixed solvent the powder of a certain amount of (mass volume ratio W/V is 0.5-3%) is ultrasonic, to be printed on the glass sheet of heavy old fingerprint then, the dispersion liquid that copper sheet is put into nanometer powder soaks, after 5-15 minute, taking-up is dried, and just can be observed fingerprint clearly.
Will avoid when brush shows the laten fingerprints that is imprinted on glass sheet, plastic bottle, copper sheet, aluminium foil, pop can surface with the harder hairbrush of hair, in order to avoid destroy the fingerprint lines, 40 days heavy old fingerprint of glass sheet surface still can manifest; And when being imprinted on the developing latent finger prints using on desk or experiment table surface,, use harder hairbrush if the surface is more coarse, surface that can deep enough injustice shows and sinks old fingerprint clearly.Generally speaking, the laten fingerprints difficulty that manifests wood surface is bigger, and the present invention not only can clearly manifest the laten fingerprints of wood surface, wood surface 10-20 days heavy old developing latent finger prints using can also be come out.
Claims (4)
1. the nucleocapsid structure silicon dioxide SiO that has fluorescence
2/ dye molecule/TiO
2The microballoon powder powder manifest and the wet method developing latent finger prints using aspect application.
2. the nucleocapsid structure silicon dioxide SiO that has fluorescence
2/ dye molecule/TiO
2The microballoon powder is used for laten fingerprints powder and wet method method for visualizing, it is characterized in that: dip in small quantities of powder with hairbrush, stencil the various surfaces of laten fingerprints gently, comprise glass sheet, plastic bottle, pop can, copper sheet, aluminium foil, paper, desk or experiment table surface, promptly can be observed the fingerprint lines that manifests, take pictures with digital camera; Under ultraviolet source irradiation, observe luminous clearly striped, the residual of under ultraviolet source, taking pictures certificate; When manifesting with wet method, by mass volume ratio W/V is that 0.5-3% puts into water with powder, add small amount of ethanol, ultrasonic dispersion 2-3 minute, the sample that will be printed on laten fingerprints is put into dispersion liquid and is soaked, take out after 5-20 minute and dry, can see the clear showing finger print image, take pictures with digital camera and fetch data.
3. the silver-colored nucleocapsid silicon dioxide microsphere powder (SiO that coats
2/ Ag), the PS nucleocapsid structure PS/Ag microballoon powder that coats of polystyrene (PS) mono-dispersion microballoon powder and silver manifests and show application in the existing laten fingerprints of Faxian at powder.
4. the silver-colored nucleocapsid silicon dioxide microsphere powder (SiO that coats
2/ Ag), the PS nucleocapsid structure PS/Ag microballoon powder that coats of polystyrene (PS) mono-dispersion microballoon powder and silver is used for the laten fingerprints powder and manifests and the wet method method for visualizing, it is characterized in that: dip in a small amount of above-mentioned a kind of microballoon powder with hairbrush, stencil the various surfaces of laten fingerprints gently, comprise glass sheet, plastic bottle, pop can, copper sheet, aluminium foil, paper, desk or experiment table surface, promptly can be observed the fingerprint lines that manifests, take pictures with digital camera; When manifesting, be that 0.5-3% puts into water with above-mentioned a kind of microballoon powder, add small amount of ethanol by mass volume ratio W/V with wet method, ultrasonic dispersion 2-3 minute, the sample that will be printed on laten fingerprints is put into dispersion liquid and is soaked, and takes out after 5-20 minute and dries, and can see the clear showing finger print image.
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| CN2009100664938A CN101477058B (en) | 2009-01-20 | 2009-01-20 | Method for using silicon dioxide and polystyrene functionalized particle in hidden fingerprint appearance |
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| CN2009100664938A CN101477058B (en) | 2009-01-20 | 2009-01-20 | Method for using silicon dioxide and polystyrene functionalized particle in hidden fingerprint appearance |
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| CN101477058B true CN101477058B (en) | 2011-06-15 |
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| CN101690663B (en) * | 2009-09-24 | 2011-12-21 | 东北师范大学 | Method for latent fingerprint manifestation by magnetic fluorescent silicon dioxide |
| CN101792147B (en) * | 2010-01-12 | 2012-05-09 | 清华大学深圳研究生院 | Surface modification method of silica particles and method for displaying latent fingerprints |
| CN102988058B (en) * | 2011-09-16 | 2015-05-13 | 国家纳米科学中心 | Color silica nano-particle used for displaying latent fingerprints and preparation method thereof |
| CN102920462A (en) * | 2012-11-14 | 2013-02-13 | 江苏警官学院 | Surface functionalization nanometer upconversion materials used for display of latent fingerprints |
| CN103784149B (en) * | 2014-03-05 | 2015-09-23 | 北京科技大学 | A kind of many metal deposition technique manifest the method for laten fingerprints |
| US10877041B2 (en) | 2014-05-05 | 2020-12-29 | Nicolas H. VOELCKER | Methods of detecting biological prints, fluids or analytes therein using porous semiconductor substrates |
| CN104087022B (en) * | 2014-06-30 | 2016-06-29 | 肇庆金三江硅材料有限公司 | A kind of silicon dioxide of hud typed cladding pigment and preparation method thereof |
| CN104337522B (en) * | 2014-11-24 | 2017-01-11 | 中国刑事警察学院 | Method for displaying latent fingerprints by adopting fluorescent dye-modified nano particles |
| CN106680254B (en) * | 2016-12-22 | 2019-11-05 | 东北师范大学 | FITC-SiO2/PAA hallow nanoparticles and its application in developing latent finger printss |
| CN109181680B (en) * | 2018-11-28 | 2021-08-13 | 青岛大学 | Silicon dioxide-rare earth-titanium dioxide hybrid material and preparation method thereof |
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