CN105975962B - A kind of integral method for realizing latent print development and transfer based on the separation of poly-dopamine film interface - Google Patents
A kind of integral method for realizing latent print development and transfer based on the separation of poly-dopamine film interface Download PDFInfo
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- CN105975962B CN105975962B CN201610505460.9A CN201610505460A CN105975962B CN 105975962 B CN105975962 B CN 105975962B CN 201610505460 A CN201610505460 A CN 201610505460A CN 105975962 B CN105975962 B CN 105975962B
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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
-
- 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
- C08G73/02—Polyamines
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
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- C—CHEMISTRY; METALLURGY
- 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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- 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
- C08J2479/02—Polyamines
Abstract
The invention discloses a kind of integral methods that latent print development and transfer are realized based on the separation of poly-dopamine film interface, include the following steps：(1) PDMS film one side is coated into upper PDA film and forms composite membrane；(2) carrier for bearing latent fingerprint is subjected to aging pretreatment, then carrier is gently adjacent to composite membrane using PDA film as contact surface, by PDMS film and PDA UF membrane after standing 5s~20min, it is transfer membrane that PDA film and latent fingerprint tough, which are partially left at PDMS membrane marker, and another part stays on carrier；(3) electroless deposition that transfer membrane and carrier carry out silver is obtained into the latent fingerprint image agreed on yin-yang two sides respectively.On the one hand the method disclosed in the present can develop to latent fingerprint in different surfaces, moreover it is possible to be transferred into the surface PDMS and do sampling preservation, fingerprint extraction etc. has huge application potential at the scene.
Description
Technical field
The invention belongs to print development technical fields of diving, and in particular to one kind is realized based on the separation of poly-dopamine film interface
Latent print development and the integral method of transfer.
Background technique
Fingerprint is finger tips finger pulp epicuticle fold and the concave convex texture formed or its mark left, is in " wave " shape
The characteristics of (wrinkle ridge) plays (line paddy) distribution, has people variant, constant throughout one's life and touching object trace, was once known as " evidence by judicial circuit
First of ".Fingerprint can be divided into three classes：Obvious line (hand is stained with paint, blood, ink and other items and is transferred), (the finger contact of molding line
Be stamped on the soft substance such as candle, clay and form) and visually sightless latent fingerprint (object and its carrying secreted by finger
Invisible contaminant transfers).
Need certain process for show that could observe its fingerprint lines, the prior art in visual sightless latent fingerprint
In, the process for show of latent fingerprint mainly has optical method, physics appearance method, chemical appearance method and physical chemistry appearance method.Optics
Appearance method generally requires complicated instrument auxiliary, is unsuitable for field assay, as luminescence method needs chemiluminescence instrument, infrared spectroscopy
Method and mass spectrography need spectrometer, and bounce technique needs laser lamp etc.；Property and surface shape of the physics appearance method for the object that develops
State is more demanding, and if powder method is difficult to show in moist surface, water logging object and rough surface, vacuum metal deposition method is difficult to
Porous surface shows；Chemical appearance method, such as ninhydrin method and DFO method, since ninhydrin and DFO react slowly at room temperature,
And it can be reacted with the chemical constituent in fingerprint, the further analysis for leading to developing time length, influencing fingerprint；So physico
Learning appearance method is that print development field uses more method.
And for physical chemistry appearance method, the application of visualization reagent is the key that determine that finger mark shows quality, and the prior art
Physical chemistry development to still have development of poor quality, carrier surface requires high, is unfavorable for that fingerprint on site extracts and sampling is protected
The defect deposited, and can not achieve print development and save and synchronize.So to those skilled in the art, inventing one kind
It can develop in different surfaces to latent fingerprint, moreover it is possible to which latent fingerprint carries out transfer to make the method that sampling saves being very necessary.
Summary of the invention
Realize that latent fingerprint is aobvious based on the separation of poly-dopamine film interface in view of this, the purpose of the present invention is to provide one kind
Shadow and the integral method of transfer, one aspect of the present invention can develop to latent fingerprint in different surfaces, moreover it is possible to be transferred into
PDMS does on surface sampling and saves, and fingerprint extraction etc. has huge application potential at the scene.
In order to achieve the above objectives, the present invention provides the following technical solutions：
A kind of integral method for realizing latent print development and transfer based on the separation of poly-dopamine film interface, including it is as follows
Step：
(1) PDMS film one side is coated into upper PDA film and forms composite membrane；
(2) carrier that will bear latent fingerprint carries out aging pretreatment, is then contact surface by carrier and composite membrane using PDA film
It is gently adjacent to, PDMS film and PDA UF membrane, PDA film and latent fingerprint tough is partially left at PDMS film mark after standing 5s~20min
It is denoted as transfer membrane, another part stays on carrier；
(3) electroless deposition that transfer membrane and carrier carry out silver is obtained into the latent fingerprint image agreed on yin-yang two sides respectively.
Preferably, the preparation of step (1) described composite membrane includes the following steps：
A, the synthesis of PDMS film：With mass ratio 10:1 takes PDMS, curing agent mixing, vacuumizes the bubble floating made in mixed liquor
It to surface and ruptures, mixed liquor is kept into 2~4h under the conditions of temperature is 60~100 DEG C, mixed liquor is then poured into culture dish
Middle growth PDMS film；
B, cladding of the PDA film on PDMS film：Tris-HCl buffer, Dopamine hydrochloride, Ammonium Persulfate 98.5 is taken to be placed in beaker
In and stir into mixed solution, mixed solution is poured into the culture dish of step (1) growth PDMS film, it is anti-under the conditions of 20~25 DEG C
20min~4h is answered, the surface PDMS is rinsed with secondary water, is then dried with nitrogen, obtains composite membrane.
Preferably, the curing agent is Sylgard 184 or DOW CORNING.
Preferably, PDMS film described in step a with a thickness of 0.3-20mm.
Preferably, the preparation of step (1) described composite membrane includes the following steps：
A, the synthesis of PDMS film：It weighs 3gPDMS and 0.3g curing agent after mixing, vacuumizes the gas made in mixed liquor
Bubble is floating to surface and ruptures, then is placed on 2~4h on 60~100 DEG C of warm tables, then pours into culture dish mixed liquor and grows
PDMS film；
B, cladding of the PDA film on PDMS：Taking 15ml concentration is 50mmol/L, and the tris-HCl that pH is 8.5 is placed in cleaning
In beaker, 30mg Dopamine hydrochloride, 30mg ammonium persulfate is added, stirs 1 minute, pours into the culture dish with PDMS film, room
Warm lower reaction 2 hours, secondary water rinsed the surface PDMS, is then dried with nitrogen, and repeats flushing and drying process 1~2 time, guaranteed
The integrality of PDA film.
Preferably, step (2) the aging pretreatment is carried out as follows：The carrier of latent fingerprint will be born in air
Middle standing aging 1~3 day；Or 15~60min is heated under the conditions of 60 DEG C of temperature.
Preferably, the electroless deposition of step (3) silver includes the following steps：
A, the AgNO that 3ml concentration is 5mmol/L is added in clean tube3Solution, mass fraction, which is added dropwise, in oscillation is
4% ammonium hydroxide, solution become brown, continue to be added dropwise and clarify until solution becomes, add the Portugal that 100 μ l concentration are 8.33mmol/L
Grape sugar juice shakes up to obtain silver-colored growth-promoting media；
B, transfer membrane and carrier are put into silver-colored growth-promoting media, react 1~30min, after taking-up, secondary water cleaning, nitrogen is blown
It is dry, obtain contrast height, the clear fingerprint of texture.
Preferably, the carrier is flat carrier or curved surface carrier.
Preferably, the carrier is sheet glass, polythene strip, polyester flake, silicon wafer, ceramic tile or stainless steel substrates.
The beneficial effects of the present invention are：The present invention is using poly-dopamine (polydopamine, PDA) film in flexibility poly- two
The weak characteristic of adsorption capacity on methylsiloxane (polydimethyl siloxane, PDMS) sheet surface is shifted by contact,
PDA film on the surface PDMS is selectively transferred on the protrusion wrinkle ridge of fingerprint, so that line paddy and wrinkle ridge color difference is occurred, makes to dive
Fingerprint manifestation；Good contrast further is obtained, texture is clear to catalysis reduction fixed point one layer of silver of deposition of metal using PDA
Clear latent fingerprint pattern；Importantly, the clear negative photograph of fingerprint pattern can be also obtained by deposition of silver on the surface PDMS
Piece, main effect are：
1) fingerprint is dived while original vector surface shows, and is realized the transfer (to the surface PDMS) of fingerprint, is conducive to refer to
The preservation of line obtains the latent fingerprint image that the perfection of yin-yang two sides agrees with.
2) the latent print development and extraction being applicable in simultaneously on flat carrier and curved surface carrier.
3) PDA transfer development, deposition of silver development two methods guarantee that understanding for fingerprint shows.
4) this method is suitable for variety carrier surface, including but not limited to sheet glass, polythene strip, polyester flake, silicon wafer, general
Light passing slides ceramic tile, stainless steel substrates etc., is easy to apply in practice.
5) easy to operate and effectively overcome conventional method complex steps, higher to staff's professional skill requirement
The disadvantages of.
6) this method has higher sensitivity and a contrast, material preparation process is skillful, it is green safe, easily controllable and at
This more low advantage, it is expected to realize industrialization large-scale production.
7) good development and transfer ability are all had to the latent fingerprint of different ageing times.
Detailed description of the invention
In order to keep the purpose of the present invention, technical scheme and beneficial effects clearer, the present invention provides following attached drawing：
Fig. 1 shows the integrated process signals that latent print development and transfer are realized based on the separation of poly-dopamine film interface
Figure；
Fig. 2 is indicated on different carriers and corresponding PDMS film after PDA transfer, the latent fingerprint before deposition of silver；
Latent fingerprint of the latent fingerprint after deposition of silver on Fig. 3 different carriers and on corresponding PDMS film；
Fig. 4 indicate polyester flake on latent fingerprint deposition of silver show after stereoscan photograph and elemental silver distribution map；
Fig. 5 indicates after placing different time in Fig. 5 expression air that the deposition of silver development for fingerprint of diving on glass slide is schemed and corresponded to
The negative image obtained on PDMS；
The developing latent finger printss figure and its corresponding negative image on PDMS of Fig. 6 expression glass slide.
Specific embodiment
A preferred embodiment of the present invention will be described in detail below.The experiment side of actual conditions is not specified in embodiment
Method, usually according to conventional conditions or according to the manufacturer's recommendations.
Embodiment 1
The integration of latent print development and transfer is realized based on the separation of poly-dopamine film interface, specific step is as follows：
(1) PDMS film one side is coated into upper PDA film and forms composite membrane
A, the synthesis of PDMS film：3gPDMS and 0.3g DOW CORNING are weighed, after mixing, vacuumizes the gas made in mixed liquor
Bubble is floating to surface and ruptures, then is placed on 2~4h on 60~100 DEG C of warm tables, then pours into culture dish mixed liquor and grows
PDMS film；
B, cladding of the PDA film on PDMS：Taking 15ml concentration is 50mmol/L, and the tris-HCl that pH is 8.5 is placed in cleaning
In beaker, 30mg Dopamine hydrochloride, 30mg ammonium persulfate is added, stirs 1 minute, pours into the culture dish with PDMS film, room
Warm lower reaction 2 hours, secondary water rinsed the surface PDMS, is then dried with nitrogen, and repeats flushing and drying process 1~2 time, guaranteed
The integrality of PDA film；
(2) composite membrane and latent fingerprint tough and transfer is separated
The carrier for bearing latent fingerprint is subjected to aging pretreatment, it is then by contact surface of PDA film that carrier is light with composite membrane
It is gently adjacent to, PDMS film and PDA UF membrane, PDA film and latent fingerprint tough is partially left at PDMS membrane marker to turn after standing 5min
Film is moved, another part stays on carrier；
(3) development of latent fingerprint
A, the AgNO that 3ml concentration is 5mmol/L is added in clean tube3Solution, mass fraction, which is added dropwise, in oscillation is
4% ammonium hydroxide, solution become brown, continue to be added dropwise and clarify until solution becomes, add the Portugal that 100 μ l concentration are 8.33mmol/L
Grape sugar juice shakes up to obtain silver-colored growth-promoting media；
B, transfer membrane and carrier are put into silver-colored growth-promoting media, react 1~30min, after taking-up, secondary water cleaning, nitrogen is blown
It is dry, obtain contrast height, the clear fingerprint of texture.
Above method steps flow chart is as shown in Figure 1.
Use glass slide, stainless steel, ceramic tile, polyester flake and polythene strip, silicon wafer as carrier respectively using above method,
It is tested：
The latent fingerprint on expression different carriers is arranged on Fig. 2 after PDA transfer, the latent fingerprint before deposition of silver, (wherein a,
C, e, g, i are respectively glass slide, stainless steel, ceramic tile, polyester flake and polythene strip), below row's photo be on PDMS PDA shift
Afterwards, corresponding feminine gender photo before deposition of silver.
Fig. 3 indicates that (a, c, e, g, i, k are respectively to carry glass to latent fingerprint of the latent fingerprint on different carriers after deposition of silver
Piece, silicon wafer, ceramic tile, stainless steel, polythene strip and polyester flake), below row's photo be corresponding feminine gender after deposition of silver on PDMS
Photo.As seen from Figure 3, its latent print development is more obvious compared to Fig. 2 by Fig. 3.
Fig. 4 indicates stereoscan photograph (a-d) and elemental silver (e-f) after the latent fingerprint deposition of silver on polyester flake shows
Distribution map extremely agrees with the lines of fingerprint.
Fig. 5 indicates after placing different time in air that the deposition of silver for fingerprint of diving on glass slide, which develops, schemes, and (a, c, e are put respectively
Set 1,7,50 days), lower row corresponds to the negative image obtained on PDMS.As can be seen from Figure, the method may be implemented protect standing time compared with
The development and transfer of long latent fingerprint.
Fig. 6 is indicated：The developing latent finger printss figure of glass slide and its corresponding negative image on PDMS, as can be seen from Figure, yin-yang
Two sides perfection agrees with.
It can to sum up prove, the present invention is using poly-dopamine (polydopamine, PDA) film in flexible dimethyl silicone polymer
The weak characteristic of adsorption capacity on (polydimethyl siloxane, PDMS) sheet surface is shifted by contact, by the surface PDMS
On PDA film be selectively transferred on the protrusion wrinkle ridge of fingerprint, make line paddy and color difference occur in wrinkle ridge, make developing latent finger printss；
Good contrast, the latent fingerprint of clean mark further are obtained to catalysis reduction fixed point one layer of silver of deposition of metal using PDA
Pattern；Importantly, the clear negative photo of fingerprint pattern can be also obtained by deposition of silver on the surface PDMS.
Finally, it is stated that preferred embodiment above is only used to illustrate the technical scheme of the present invention and not to limit it, although logical
It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (8)
1. a kind of integral method for being realized latent print development and transfer based on the separation of poly-dopamine film interface, feature are existed
In including the following steps：
（1）By PDMS membrane（PDMS film）Upper poly-dopamine film is coated on one side（PDA film）Form composite membrane；
（2）The carrier that latent fingerprint will be born carries out aging pretreatment, then using PDA film be contact surface by carrier and composite membrane gently
It is adjacent to, by PDMS film and PDA UF membrane after standing 5s ~ 20min, PDA film is partially left at PDMS membrane marker with latent fingerprint tough and is
Transfer membrane, another part stay on carrier；
（3）The electroless deposition that transfer membrane and carrier carry out silver is obtained into the latent fingerprint image agreed on yin-yang two sides respectively.
2. a kind of one for realizing latent print development and transfer based on the separation of poly-dopamine film interface according to claim 1
Change method, it is characterised in that：Step（1）The preparation of the composite membrane includes the following steps：
A, the synthesis of PDMS film：With mass ratio 10:1 takes PDMS, curing agent mixing, and vacuumizing makes the bubble in mixed liquor floating to table
Face simultaneously ruptures, and mixed liquor is kept 2~4h under the conditions of temperature is 60~100 DEG C, then pours into mixed liquor raw in culture dish
Long PDMS film；
B, cladding of the PDA film on PDMS film：Tris-HCl buffer, Dopamine hydrochloride, Ammonium Persulfate 98.5 is taken to be placed in a beaker simultaneously
Mixed solution is stirred into, mixed solution is poured into culture dish described in step a, 20min ~ 4h is reacted under the conditions of 20 ~ 25 DEG C, is used
Secondary water rinses the surface PDMS, is then dried with nitrogen, obtains composite membrane.
3. a kind of one for realizing latent print development and transfer based on the separation of poly-dopamine film interface according to claim 2
Change method, it is characterised in that：PDMS film with a thickness of 0.3-20mm described in step a.
4. a kind of one for realizing latent print development and transfer based on the separation of poly-dopamine film interface according to claim 2
Change method, it is characterised in that：Step（1）The preparation of the composite membrane includes the following steps：
A, the synthesis of PDMS film：It weighs 3gPDMS and 0.3g curing agent after mixing, vacuumizes the bubble floating made in mixed liquor
It to surface and ruptures, then is placed on 2~4h on 60~100 DEG C of warm tables, then mixed liquor is poured into and grows PDMS in culture dish
Film；
B, cladding of the PDA film on PDMS：Taking 15ml concentration is 50mmol/L, and the tris-HCl that pH is 8.5 is placed in clean burning
In cup, 30mg Dopamine hydrochloride, 30mg ammonium persulfate is added, stirs 1 minute, pours into the culture dish with PDMS film, room temperature
Lower reaction 2 hours, secondary water rinses the surface PDMS, is then dried with nitrogen, and repeats flushing and drying process 1 ~ 2 time, guarantees PDA film
Integrality.
5. a kind of one for realizing latent print development and transfer based on the separation of poly-dopamine film interface according to claim 1
Change method, it is characterised in that：Step（2）The aging pretreatment is carried out as follows：The carrier for bearing latent fingerprint is existed
Aging 1~3 day is stood in air；Or 15~60min is heated under the conditions of 60 DEG C of temperature.
6. a kind of one for realizing latent print development and transfer based on the separation of poly-dopamine film interface according to claim 1
Change method, it is characterised in that：Step（3）The electroless deposition of the silver includes the following steps：
A, the AgNO that 3ml concentration is 5mmol/L is added in clean tube3Solution, it is 4% that mass fraction is added dropwise in oscillation
Ammonium hydroxide, solution become brown, continue to be added dropwise and clarify until solution becomes, add the glucose that 100 μ l concentration are 8.33mmol/L
Solution shakes up to obtain silver-colored growth-promoting media；
B, transfer membrane and carrier are put into silver-colored growth-promoting media, react 1~30min, after taking-up, secondary water cleaning is dried with nitrogen, obtains
High, the clear fingerprint of texture to contrast.
7. a kind of one for realizing latent print development and transfer based on the separation of poly-dopamine film interface according to claim 1
Change method, it is characterised in that：The carrier is flat carrier or curved surface carrier.
8. a kind of one for realizing latent print development and transfer based on the separation of poly-dopamine film interface according to claim 1
Change method, it is characterised in that：The carrier is sheet glass, polythene strip, polyester flake, silicon wafer, ceramic tile or stainless steel substrates.
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| CN107049331B (en) * | 2017-04-11 | 2019-11-15 | 周婧 | A kind of flexible composite of sandwich structure and its preparation method and application |
| 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 |
| 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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| US6162485A (en) * | 1998-05-07 | 2000-12-19 | Wallace Computers Services, Inc. | Fingerprinting system and method |
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| CN103356199A (en) * | 2013-07-19 | 2013-10-23 | 北京科技大学 | Method for manifesting metal surface hidden fingerprints through chemical sedimentation |
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| CN105671525A (en) * | 2016-01-27 | 2016-06-15 | 西南大学 | Method for manufacturing patterned metal film based on poly-dopamine and product thereof |
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