CN105975962A - Integrated method for implementing latent fingerprint development and transfer based on polydopamine film interface separation - Google Patents
Integrated method for implementing latent fingerprint development and transfer based on polydopamine film interface separation Download PDFInfo
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/117—Identification of persons
- A61B5/1171—Identification of persons based on the shapes or appearances of their bodies or parts thereof
- A61B5/1172—Identification of persons based on the shapes or appearances of their bodies or parts thereof using fingerprinting
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
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- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
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- C08J2383/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2383/04—Polysiloxanes
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2479/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen, or carbon only, not provided for in groups C08J2461/00 - C08J2477/00
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Abstract
The invention discloses an integrated method for implementing latent fingerprint development and transfer based on polydopamine film interface separation. The method comprises the following steps: (1) coating one side of a PDMS (Polydimethylsiloxane) film with a PDA (Polydopamine) film to form a composite film; (2) performing aging pretreatment on a carrier carrying latent fingerprints, then lightly attaching the carrier to the composite film in a mode that the PDA film is used as a contact face, standing for 5s-20min, and then separating the PDMS film from the PDA film, wherein the PDA film and latent fingerprint contact part is left on the PDMS film marked as a transfer film, and the other part is left on the carrier; and (3) separately performing electroless deposition of silver on the transfer film and the carrier to obtain a latent fingerprint image with matched male and female sides. By adopting the method, the latent fingerprints can be developed on different surfaces, and can also be transferred to the PDMS surface for sampling and storage, so that the method has huge application potential in scene fingerprint extraction and the like.
Description
Technical field
The invention belongs to latent print development technical field, be specifically related to a kind of separation based on poly-dopamine film interface and realize latent fingerprint
Development and the integral method of transfer.
Background technology
Fingerprint is that finger tips refers to abdomen upper epidermis fold and the concave convex texture that formed or its impression stayed, in " wave " shape (stricture of vagina
Ridge) play (stricture of vagina paddy) distribution, there is people variant, the feature of the most constant and tactile thing trace, once it was referred to as " evidence by judicial circuit
First of ".Fingerprint can be divided three classes: substantially stricture of vagina (hands is stained with the article transfers such as paint, blood, ink and is formed), molding stricture of vagina (finger
Contact printing forms on the soft material such as wax candle, clay) and visual sightless latent fingerprint (thing secreted by finger and carrying
Invisible contaminant transfer form).
Need certain process for show could observe its fingerprint lines for visual sightless latent fingerprint, in prior art, latent finger
The process for show of stricture of vagina mainly has optical method, physics appearance method, chemistry appearance method and physical chemistry appearance method.Optics appearance method one
As need complexity instrument auxiliary, be unsuitable for field assay, as luminescence method needs chemiluminescence instrument, infrared spectrometry and mass spectrum
Method needs spectrogrph, bounce technique to need laser lamp etc.；Physics appearance method requires higher for character and the apparent condition of development object,
As powder method is difficult to manifest at moist surface, water logging object and rough surface, vacuum metal deposition method is difficult to manifest at porous surface
Deng；Chemistry appearance method, such as ninhydrin method and DFO method, due to 1,2,3-indantrione monohydrate and DFO at room temperature sluggish, and meeting and referring to
Chemical constituent in stricture of vagina is reacted, and causes developing time length, affects analyzing further of fingerprint；So physical chemistry appearance method
It is that print development field uses more method.
And for physical chemistry appearance method, the application of visualization reagent is to determine the key that finger mark manifests quality, and the physics of prior art
Chemical development yet suffers from developing of poor quality, and carrier surface requires height, is unfavorable for the defect that fingerprint on site extracts and sampling preserves,
And print development can not be realized and preserve synchronization.So to those skilled in the art, invention one can be at different tables
In the face of latent fingerprint develops, moreover it is possible to it is the most necessary that latent fingerprint carry out transfer to be made to sample the method preserved.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of separation based on poly-dopamine film interface realize latent print development and turn
The integral method moved, latent fingerprint can be developed by one aspect of the present invention at different surfaces, moreover it is possible to is transferred into PDMS table
Face is done sampling and is preserved, and the aspect such as fingerprint extraction has huge application potential at the scene.
For reaching above-mentioned purpose, the invention provides following technical scheme:
A kind of separation based on poly-dopamine film interface realizes latent print development and the integral method of transfer, comprises the steps:
(1) the PDMS film upper PDA film of one side cladding is formed composite membrane；
(2) carrier bearing latent fingerprint is carried out aging pretreatment, then with PDA film for contact surface, carrier is light with composite membrane
Gently it is adjacent to, after standing 5s～20min, PDMS film and PDA membrance separation, PDA film and latent fingerprint tough is partially left at PDMS
Membrane marker is transfer membrane, and another part is stayed on carrier；
(3) electroless deposition that transfer membrane and carrier carry out silver respectively obtains the latent fingerprint image that negative and positive two sides is agreed with.
Preferably, the preparation of step (1) described composite membrane comprises the steps:
The synthesis of a, PDMS film: taking PDMS, sclerosing agent mixing with mass ratio 10:1, evacuation makes the bubble in mixed liquor
Floating to surface and rupture, mixed liquor is kept under the conditions of temperature is 60～100 DEG C 2～4h, then pours mixed liquor into culture dish
Middle growth PDMS film；
B, PDA film cladding on PDMS film: take tris-HCl buffer, dopamine hydrochloride, Ammonium Persulfate 98.5 are placed in beaker
In and stir into mixed solution, mixed solution is poured into step (1) growth PDMS film culture dish in, under the conditions of 20～25 DEG C
Reaction 20min～4h, rinses PDMS surface with secondary water, and then nitrogen dries up, and obtains composite membrane.
Preferably, described sclerosing agent is Sylgard 184 or DOW CORNING.
Preferably, the thickness of PDMS film described in step a is 0.3-20mm.
Preferably, the preparation of step (1) described composite membrane comprises the steps:
The synthesis of a, PDMS film: weighing after 3gPDMS with 0.3g sclerosing agent mixs homogeneously, evacuation makes the gas in mixed liquor
Bubble is floating to surface and rupture, then is placed on 60～100 DEG C of warm tables 2～4h, is then poured into by mixed liquor in culture dish and grows
PDMS film；
B, PDA film cladding on PDMS: take 15ml concentration be 50mmol/L, pH be the tris-HCl of 8.5, be placed in
In clean beaker, add 30mg dopamine hydrochloride, 30mg Ammonium persulfate., stir 1 minute, pour the long training having PDMS film into
Supporting in ware, react 2 hours under room temperature, secondary water rinses PDMS surface, and then nitrogen dries up, and repeats to rinse and dry run
1～2 time, it is ensured that the integrity of PDA film.
Preferably, the described aging pretreatment of step (2) is carried out as follows: by the most quiet for the carrier of bearing latent fingerprint
Put aging 1～3 day；Or under 60 DEG C of temperature conditionss, heat 15～60min.
Preferably, the electroless deposition of step (3) described silver comprises the steps:
A, in clean tube add 3ml concentration be the AgNO of 5mmol/L3Solution, vibration limit, limit dropping mass fraction is
The ammonia of 4%, solution becomes brown, continues dropping until solution becomes clarification, and adding 100 μ l concentration is 8.33mmol/L's
Glucose solution, shakes up to obtain silver-colored growth-promoting media；
B, transfer membrane and carrier are put into silver growth-promoting media in, react 1～30min, after taking-up, secondary water clean, nitrogen dries up,
Obtain contrast height, texture clearly fingerprint.
Preferably, described carrier is flat carrier or curved surface carrier.
Preferably, described carrier is sheet glass, polythene strip, polyester flake, silicon chip, ceramic tile or stainless steel substrates.
The beneficial effects of the present invention is: the present invention utilizes poly-dopamine (polydopamine, PDA) film at flexible poly dimethyl silicon
The characteristic that on oxygen alkane (polydimethyl siloxane, PDMS) sheet surface, absorption affinity is weak, is shifted by contact, by PDMS
PDA thin film on surface is selectively transferred on the projection wrinkle ridge of fingerprint, makes stricture of vagina paddy and wrinkle ridge aberration occur, makes latent fingerprint show
Existing；Further with PDA, the catalysis reduction of metal is pinpointed one layer of silver of deposition, obtain good contrast, diving of clean mark
Fingerprint pattern；The more important thing is, PDMS surface also can be obtained by deposition of silver the clear negative photo of fingerprint pattern, main
Effect is wanted to be:
1) latent fingerprint is while original vector surface manifests, it is achieved that the transfer (to PDMS surface) of fingerprint, beneficially refers to
The preservation of stricture of vagina, obtains the latent fingerprint image that the perfection of negative and positive two sides agrees with.
2) it is suitable for the latent print development on flat carrier and curved surface carrier and extraction simultaneously.
3) PDA transfer development, deposition of silver development two methods ensure that understanding of fingerprint manifests.
4) the method is applicable to variety carrier surface, includes but not limited to sheet glass, polythene strip, polyester flake, silicon chip, common
Smooth ceramic tile, stainless steel substrates etc., it is easy to apply in practice.
5) easy and simple to handle and effectively overcome traditional method complex steps, staff's professional skill is required the shortcoming such as higher.
6) the method has higher sensitivity and contrast, material preparation process is skillful, green safety, easily controllable and cost relatively
The advantage such as low, it is expected to realize industrialization large-scale production.
7) the latent fingerprint of different ageing times is respectively provided with good development and transfer ability.
Accompanying drawing explanation
In order to make the purpose of the present invention, technical scheme and beneficial effect clearer, the present invention provides drawings described below:
Fig. 1 represents the schematic flow sheet separating the integration realizing latent print development and transfer based on poly-dopamine film interface；
Fig. 2 represents the latent fingerprint on the PDMS film of different carriers and correspondence after PDA shifts, before deposition of silver；
The latent fingerprint on Fig. 3 different carriers and on the PDMS film of correspondence latent fingerprint after deposition of silver；
Fig. 4 represent the latent fingerprint deposition of silver on polyester flake manifest after stereoscan photograph and the scattergram of elemental silver；
Fig. 5 represents that Fig. 5 represents in air after placement different time, and on microscope slide, the deposition of silver development of latent fingerprint is schemed and corresponding PDMS
On the negative that obtains；
Fig. 6 represents developing latent finger prints figure and its negative corresponding on PDMS of microscope slide.
Detailed description of the invention
Below the preferred embodiments of the present invention are described in detail.The experimental technique of unreceipted actual conditions in embodiment is logical
Often according to normal condition or according to the condition proposed by manufacturer.
Embodiment 1
Separate based on poly-dopamine film interface and realize latent print development and the integration of transfer, specifically comprise the following steps that
(1) the PDMS film upper PDA film of one side cladding is formed composite membrane
The synthesis of a, PDMS film: weigh 3gPDMS Yu 0.3g DOW CORNING, after mix homogeneously, evacuation makes in mixed liquor
Bubble is floating to surface and ruptures, then is placed on 60～100 DEG C of warm tables 2～4h, is then poured into by mixed liquor in culture dish and grows
PDMS film；
B, PDA film cladding on PDMS: take 15ml concentration be 50mmol/L, pH be the tris-HCl of 8.5, be placed in
In clean beaker, add 30mg dopamine hydrochloride, 30mg Ammonium persulfate., stir 1 minute, pour the long training having PDMS film into
Supporting in ware, react 2 hours under room temperature, secondary water rinses PDMS surface, and then nitrogen dries up, and repeats to rinse and dry run
1～2 time, it is ensured that the integrity of PDA film；
(2) composite membrane and latent fingerprint tough and separate transfer
The carrier bearing latent fingerprint is carried out aging pretreatment, then for contact surface, carrier is pasted gently with composite membrane with PDA film
Tightly, after standing 5min, PDMS film and PDA membrance separation, PDA film and latent fingerprint tough are partially left at PDMS membrane marker
For transfer membrane, another part is stayed on carrier；
(3) development of latent fingerprint
A, in clean tube add 3ml concentration be the AgNO of 5mmol/L3Solution, vibration limit, limit dropping mass fraction is
The ammonia of 4%, solution becomes brown, continues dropping until solution becomes clarification, and adding 100 μ l concentration is 8.33mmol/L's
Glucose solution, shakes up to obtain silver-colored growth-promoting media；
B, transfer membrane and carrier are put into silver growth-promoting media in, react 1～30min, after taking-up, secondary water clean, nitrogen dries up,
Obtain contrast height, texture clearly fingerprint.
Above method steps flow chart is as shown in Figure 1.
Use above method to use microscope slide, rustless steel, ceramic tile, polyester flake and polythene strip, silicon chip as carrier respectively, enter
Row experiment:
On Fig. 2, row represents the latent fingerprint after PDA shifts, before deposition of silver of the latent fingerprint on different carriers, (wherein a, c,
E, g, i are respectively microscope slide, rustless steel, ceramic tile, polyester flake and polythene strip), below row's photo be PDA on PDMS
Negative photo corresponding after transfer, before deposition of silver.
Fig. 3 represents that (a, c, e, g, i, k respectively carry glass to the latent fingerprint after deposition of silver of the latent fingerprint on different carriers
Sheet, silicon chip, ceramic tile, rustless steel, polythene strip and polyester flake), below row's photo be corresponding after deposition of silver on PDMS
Negative photo.As seen from Figure 3, Fig. 3 becomes apparent from compared to its latent print development of Fig. 2.
Fig. 4 represent the latent fingerprint deposition of silver on polyester flake manifest after stereoscan photograph (a-d) and the distribution of elemental silver (e-f)
Figure, it extremely agrees with the lines of fingerprint.
Fig. 5 represents in air after placement different time, and the deposition of silver development figure of latent fingerprint on microscope slide, (a, c, e place respectively
1,7,50 days), negative that lower row's correspondence PDMS obtains.As can be seen from Figure, the method can realize protecting standing time
The development of longer latent fingerprint and transfer.
Fig. 6 represents: the developing latent finger prints figure of microscope slide and its negative corresponding on PDMS, as can be seen from Figure, and negative and positive two
Face perfection agrees with.
To sum up can prove, the present invention utilizes poly-dopamine (polydopamine, PDA) film at flexible polydimethylsiloxane
The characteristic that on (polydimethyl siloxane, PDMS) sheet surface, absorption affinity is weak, is shifted by contact, by PDMS table
PDA thin film on face is selectively transferred on the projection wrinkle ridge of fingerprint, makes stricture of vagina paddy and wrinkle ridge aberration occur, makes developing latent finger prints；
Further with PDA, the catalysis reduction of metal is pinpointed one layer of silver of deposition, obtain good contrast, the latent fingerprint of clean mark
Pattern；The more important thing is, PDMS surface also can be obtained by deposition of silver the clear negative photo of fingerprint pattern.
Finally illustrating, preferred embodiment above is only in order to illustrate technical scheme and unrestricted, although by above-mentioned
The present invention is described in detail by preferred embodiment, it is to be understood by those skilled in the art that can in form and
In details, it is made various change, without departing from claims of the present invention limited range.
Claims (9)
1. one kind separates the latent print development of realization and the integral method of transfer based on poly-dopamine film interface, it is characterised in that include
Following steps:
(1) the PDMS film upper PDA film of one side cladding is formed composite membrane；
(2) carrier bearing latent fingerprint is carried out aging pretreatment, then for contact surface, carrier is pasted gently with composite membrane with PDA film
Tightly, after standing 5s～20min, PDMS film and PDA membrance separation, PDA film and latent fingerprint tough are partially left at PDMS film
Being labeled as transfer membrane, another part is stayed on carrier；
(3) electroless deposition that transfer membrane and carrier carry out silver respectively obtains the latent fingerprint image that negative and positive two sides is agreed with.
A kind of separation based on poly-dopamine film interface realizes latent print development and the integration side of transfer
Method, it is characterised in that: the preparation of step (1) described composite membrane comprises the steps:
The synthesis of a, PDMS film: taking PDMS, sclerosing agent mixing with mass ratio 10:1, evacuation makes the bubble floating in mixed liquor
To surface and rupture, mixed liquor is kept under the conditions of temperature is 60～100 DEG C 2～4h, then mixed liquor is poured in culture dish
Growth PDMS film；
B, PDA film cladding on PDMS film: take tris-HCl buffer, dopamine hydrochloride, Ammonium Persulfate 98.5 are placed in beaker
And stir into mixed solution, and mixed solution is poured in the culture dish of step (1) growth PDMS film, anti-under the conditions of 20～25 DEG C
Answering 20min～4h, rinse PDMS surface with secondary water, then nitrogen dries up, and obtains composite membrane.
A kind of separation based on poly-dopamine film interface realizes latent print development and the integration side of transfer
Method, it is characterised in that: described sclerosing agent is Sylgard 184 or DOW CORNING.
A kind of separation based on poly-dopamine film interface realizes latent print development and the integration side of transfer
Method, it is characterised in that: the thickness of PDMS film described in step a is 0.3-20mm.
A kind of separation based on poly-dopamine film interface realizes latent print development and the integration side of transfer
Method, it is characterised in that: the preparation of step (1) described composite membrane comprises the steps:
The synthesis of a, PDMS film: weighing after 3gPDMS with 0.3g sclerosing agent mixs homogeneously, evacuation makes the bubble in mixed liquor
Floating to surface and rupture, then it is placed on 60～100 DEG C of warm tables 2～4h, then mixed liquor is poured into growth PDMS in culture dish
Film；
B, PDA film cladding on PDMS: take 15ml concentration be 50mmol/L, pH be the tris-HCl of 8.5, be placed in clean
In clean beaker, add 30mg dopamine hydrochloride, 30mg Ammonium persulfate., stir 1 minute, pour the long cultivation having PDMS film into
In ware, reacting 2 hours under room temperature, secondary water rinses PDMS surface, and then nitrogen dries up, and repeats to rinse and dry run 1～2
Secondary, it is ensured that the integrity of PDA film.
A kind of separation based on poly-dopamine film interface realizes latent print development and the integration side of transfer
Method, it is characterised in that: the described aging pretreatment of step (2) is carried out as follows: will bear the carrier of latent fingerprint at air
Aging 1～3 day of middle standing；Or under 60 DEG C of temperature conditionss, heat 15～60min.
A kind of separation based on poly-dopamine film interface realizes latent print development and the integration side of transfer
Method, it is characterised in that: the electroless deposition of step (3) described silver comprises the steps:
A, in clean tube add 3ml concentration be the AgNO of 5mmol/L3Solution, vibration limit, limit dropping mass fraction is 4%
Ammonia, solution becomes brown, continues dropping until solution becomes clarification, and adding 100 μ l concentration is the Fructus Vitis viniferae of 8.33mmol/L
Sugar juice, shakes up to obtain silver-colored growth-promoting media；
B, transfer membrane and carrier are put into silver growth-promoting media in, react 1～30min, after taking-up, secondary water clean, nitrogen dries up,
High, the texture clearly fingerprint to contrast.
A kind of separation based on poly-dopamine film interface realizes latent print development and the integration side of transfer
Method, it is characterised in that: described carrier is flat carrier or curved surface carrier.
A kind of separation based on poly-dopamine film interface realizes latent print development and the integration side of transfer
Method, it is characterised in that: described carrier is sheet glass, polythene strip, polyester flake, silicon chip, ceramic tile or stainless steel substrates.
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| CN107049331A (en) * | 2017-04-11 | 2017-08-18 | 周婧 | A kind of flexible composite of sandwich structure and its preparation method and application |
| CN107328757A (en) * | 2017-08-25 | 2017-11-07 | 西南大学 | It is a kind of to be used for the composite membrane and detection method that fingerprint is shifted, development or the absolutely dry state of inclusion integration are detected of diving |
| CN107328757B (en) * | 2017-08-25 | 2020-01-03 | 西南大学 | Composite membrane for latent fingerprint transfer, development or inclusion integrated full-dry state detection and detection method |
| CN110777400A (en) * | 2019-10-16 | 2020-02-11 | 中国科学院兰州化学物理研究所 | Micro electroforming method based on elastic conductive silicon rubber mold |
| CN110777400B (en) * | 2019-10-16 | 2021-03-19 | 中国科学院兰州化学物理研究所 | Micro electroforming method based on elastic conductive silicon rubber mold |
| CN117304575A (en) * | 2023-11-29 | 2023-12-29 | 瑞金市索梦得新材料科技有限公司 | Ti (titanium) 3 C 2 T x Preparation method and application of-Mxene@polydopamine-nano silver composite material |
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| CN105975962B (en) | 2018-11-23 |
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