CN105286877B - It is a kind of in the positive and negative method for showing latent fingerprint of different hydrophilic and hydrophobic material surfaces - Google Patents
It is a kind of in the positive and negative method for showing latent fingerprint of different hydrophilic and hydrophobic material surfaces Download PDFInfo
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- CN105286877B CN105286877B CN201510696438.2A CN201510696438A CN105286877B CN 105286877 B CN105286877 B CN 105286877B CN 201510696438 A CN201510696438 A CN 201510696438A CN 105286877 B CN105286877 B CN 105286877B
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Abstract
It is a kind of in the positive and negative method for showing latent fingerprint of different hydrophilic and hydrophobic material surfaces, belong to technique of fingerprint indentification field.The latent fingerprint for being imprinted on different hydrophilic and hydrophobic material surfaces is successively immersed in positively charged CTAB solution and negatively charged CNTs dilutions by this method, is shown using hydrophilic and hydrophobic and electrostatic absorption principle.Compared with existing chemical deposition and small-particle suspension technology, the present invention can realize that latent the positive and negative of fingerprint shows according to the hydrophilic and hydrophobic of base material, latent fingerprint suitable for showing a variety of common semipermeabilities and permeability object surface, it is and simple to operate, raw material environmental protection is easy to get, process is quick, reproducible, it is not necessary to by large-scale instrument, is dived fingerprint available for Site Detection.
Description
Technical field
The invention belongs to technique of fingerprint indentification field, is related to using negatively charged CNT (CNTs) dilution and ten
Six alkyl trimethyl ammonium bromides (CTAB) solution, at different hydrophilic and hydrophobic material surfaces (pvdf membrane, NC films and fingerprint adhesive tape etc.)
Show the method for latent fingerprint.
Background technology
Fingerprint, the also referred to as lines of the hand.Because many factors such as inhereditary material, skin texture, pathology and trauma affect are determined
The specificity, diversity and stability of fingerprint ridge are determined, there is the characteristics of people is variant, unchangeable and tactile thing trace.
Crime scene, common fingerprint are divided into three classes：Obvious line, shaping line and latent fingerprint, wherein latent fingerprint is visually not easy to find, it is crime
Most common a kind of fingerprint in scene, is research object herein.Developing latent finger printss play an important role to clear up a criminal case, can
For distinguishing the every field such as identity, safety detection and medical diagnosis.Therefore, science correctly finds, extracted, showing identification and refer to
Line, it is significant for carrying out investigation and safety detection.
The method of the latent fingerprint of detection at present mainly has the tradition such as the smoked aobvious method of silver nitrate method, ninhydrin method, iodine fumigation and 502 glue
Chemical appearance method and physicochemical appearance method.Had the disadvantages that for traditional appearance method：Reagent and other items is to operation
The body of personnel has harm；Show that effect is not obvious enough, can only typically show the primary structure of fingerprint, secondary structure shows effect
It is undesirable；There is certain destructiveness to latent fingerprint；Do not have presentation capability to the latent fingerprint on some difficult objects；It can only show
Go out erect image or the single figure of reverted image.With the continuous development of analytical technology, some are based on New technical use and carry out developing latent finger printss
Method arise at the historic moment, such as electrochemical method, x-ray fluorescence method, Fourier's infrared ray diffraction spectroscopic methodology and mass spectrography.But this
A little Appearing Techniques of Human Fingerprints usually require the training using expensive precision instrument and special expertise, are not suitable for the latent of scene of a crime
The popularization and application of fingerprint manifestation and method.
The present invention innovatively explores novel nano-material CNTs and surfactant to overcome above-mentioned problem
It is combined, latent fingerprint is shown using the hydrophilic and hydrophobic and electrostatic absorption principle of different materials.CNT (CNTs), it is a kind of
One-dimensional Quantum material with special construction, several layers to tens of layers of coaxial circles is mainly made up of the carbon atom of hexagonal arrangement
Pipe.Cetyl trimethylammonium bromide (CTAB), is soluble in isopropanol, water-soluble, is a kind of cationic surfactant, extensively
It is general be used to soaking, sterilize, be antistatic, decontamination, solubilising etc..Substrate PVDF membrane (pvdf membrane), surface hydrophobicity, tool
There is higher mechanical strength, separate the protein of small fragment, be mainly used in immunoblotting, be a kind of conventional solid phase
Holder.Nitrocellulose filter (NC films), there is very strong hydrophily, the supporting body of C/T lines is used as in colloid gold test paper, together
When be also immune response point, NC films are one of most important consumptive materials in biological test.Fingerprint adhesive tape can be used for shifting
Finger mark on various difficult objects, and then shown.The present invention is simple to operate, and raw material environmental protection is easy to get, and process is quick, repeatability
It is good, it is not necessary to by large-scale instrument, to be dived fingerprint available for Site Detection.Therefore, this method has fabulous in fingerprint identification field
Actual application value.
The content of the invention
The purpose of the present invention is：It is simple to develop a kind of step, economic and environment-friendly, the side of showing for fingerprint of being dived available for Site Detection
Method.First innovatively by novel nano-material --- CNTs is applied to showing for latent fingerprint, with negatively charged CNTs and sun
Ionic surface active agent CTAB is shows material, using hydrophilic and hydrophobic and electrostatic absorption principle, in different hydrophilic and hydrophobic materials
(pvdf membrane, NC films and fingerprint adhesive tape etc.) surface is positive and negative shows latent fingerprint.Comprise the following steps that：
(1) the latent fingerprint of oil is lightly pressed against object surface, obtains the latent fingerprint-fingerprint substrate of oil；
(2) CTAB solution and CNTs dilutions are configured；
(3) CTAB solution is added drop-wise to latent fingerprint substrate surface, reacts 10min, obtain the latent fingerprint-fingerprint substrate of oil-
CTAB；
(4) the latent fingerprint-fingerprint substrate-CTAB of the oil with positive charge obtained in step (3) is immersed into CNTs dilutions
In, 5-10min is reacted, uses ultrapure water, under natural light, can with the naked eye observe directly clearly fingerprint image after taking-up
Case；
(5) the latent fingerprint-fingerprint substrate-CTAB-CNTs of the oil shown in step (4) is positioned on horizontal, used
Digital camera is taken pictures fixed extraction fingerprint image.
Wherein, the material C NTs that shows is negatively charged CNTs dilutions, and the CTAB is the table with positive charge
Face activator solution.
Above-mentioned step (3) is the latent fingerprint of the oil obtained in step (1)-fingerprint substrate surface finger-print region covering
CTAB, ensure the uniformity of substrate surface solution, react 10min at room temperature, with filter paper suck the latent fingerprint-fingerprint substrate of oil-
The upper unnecessary water droplets of CTAB.
Above-mentioned step (4) specifically includes：Latent fingerprint-fingerprint substrate-the CTAB of oil is immersed into negatively charged CNTs to dilute
In liquid, soak time is according to different base and different；Latent fingerprint-fingerprint substrate-the CTAB-CNTs of oil is soaked with ultra-pure water and rushed
Wash, wash away the CNTs covered in substrate, you can show fingerprint.
Above-mentioned shown latent fingerprint can also be that oil mixing with water is dived fingerprint in addition to the latent fingerprint of oil.
Object described in the above method is one kind in semipermeability and permeable material, specially pvdf membrane, NC films and is referred to
One kind in line adhesive tape.
The above-mentioned technical proposal of the present invention has the beneficial effect that：
This method can show positive inverse video according to the difference of material character；Method cost is cheap, popularization easy to spread；
It is simple to operate, show quick, not by any large scale equipment, and be used for fingerprint Site Detection；Show the latent fingerprint of tape surface
Excellent, this advantage may be directly applied to the latent fingerprint detection come from surfaces of various materials extraction, some are not suitable for
The fingerprint of Site Detection shows after being shifted by this method on raw material, convenient and practical.
Brief description of the drawings
Fig. 1 is the developing latent finger printss effect picture that is obtained using pvdf membrane as object of the present invention, after left figure is developing latent finger printss
Ordinary optical image, the right is the horizontal characteristic information figure of fingerprint second that left figure provides.
Fig. 2, which is the present invention, to be sticked face object with fingerprint adhesive tape and dives the obtained effect picture of fingerprint.
Fig. 3 is the effect picture that the present invention is obtained with the latent fingerprint of NC films object, and left figure is the normal light after developing latent finger printss
Image is learned, the right is the characteristic information figure for the level of fingerprint second that left figure provides.
Embodiment
The present invention is further illustrated with reference to example, this example is only used for illustrating, and is not limited to the present invention's
Practical ranges.
Embodiment 1
By taking the developing latent finger printss on pvdf membrane surface as an example, concrete operations have following steps：
(1) pvdf membrane is cut into 1.5 × 2cm sizes with scissors, be placed in the plastic culture dish scrubbed with ethanol
It is standby；
(2) the latent fingerprint of oil is lightly pressed against pvdf membrane object surface, obtains the latent fingerprint-pvdf membrane of oil；
(3) CTAB solution and CNTs dilutions are configured；
(4) CTAB solution is added drop-wise to latent fingerprint substrate surface, reacts 10min, obtain the latent fingerprint-pvdf membrane-CTAB of oil；
(5) the latent fingerprint-pvdf membrane-CTAB of the oil with positive charge obtained in step (4) is immersed in CNTs dilutions,
5min is reacted, uses ultrapure water, under natural light, can with the naked eye observe directly clearly fingerprint after taking-up；It will become apparent from
The good oil fingerprint-pvdf membrane-CTAB-CNTs that dives is positioned on horizontal, shows fingerprint image with digital camera collection of taking pictures.
Such as Fig. 1.
Embodiment 2
By taking the developing latent finger printss on NC films surface as an example, concrete operations have following steps：
(1) NC films are cut into 1.5 × 2cm sizes with scissors, be placed on standby in the plastic culture dish scrubbed with ethanol
With；
(2) the latent fingerprint of oil is lightly pressed against NC film objects surface, obtains the latent fingerprint-NC films of oil；
(3) CTAB solution and CNTs dilutions are configured；
(4) CTAB solution is added drop-wise to latent fingerprint substrate surface, reacts 10min, obtain the latent fingerprint-NC films-CTAB of oil；
(5) the latent fingerprint-NC films-CTAB of the oil with positive charge obtained in step (4) is immersed in CNTs dilutions, instead
10min is answered, uses ultrapure water, under natural light, can with the naked eye observe directly clearly fingerprint after taking-up；It will become apparent from
The oil fingerprint-NC films-CTAB-CNTs that dives be positioned on horizontal, show fingerprint image with digital camera collection of taking pictures.Such as figure
3。
Described above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, on the premise of principle of the present invention is not departed from, some improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (7)
- It is 1. a kind of in the positive and negative method for showing latent fingerprint of different hydrophilic and hydrophobic material surfaces, it is characterised in that successively by fingerprint base Bottom is immersed in cationic surfactant cetyl trimethylammonium bromide CTAB solution and negatively charged CNT CNTs In dilution, shown using hydrophilic and hydrophobic and electrostatic absorption principle；Comprise the following steps that：(1) the latent fingerprint of oil is lightly pressed against object surface, obtains the latent fingerprint-fingerprint substrate of oil；(2) CTAB solution and CNTs dilutions are configured；(3) CTAB solution is added drop-wise to latent fingerprint substrate surface, reacts 10min, obtain the latent fingerprint-fingerprint substrate-CTAB of oil；(4) the latent fingerprint-fingerprint substrate-CTAB of the oil with positive charge obtained in step (3) is immersed in CNTs dilutions, instead 5-10min is answered, uses ultrapure water, under natural light, can with the naked eye observe directly clearly fingerprint after taking-up；(5) the latent fingerprint-fingerprint substrate-CTAB-CNTs of the oil shown in step (4) is positioned on horizontal, with number Camera collection of taking pictures shows fingerprint image.
- It is 2. according to claim 1 a kind of in the positive and negative method for showing latent fingerprint of different hydrophilic and hydrophobic material surfaces, its spy Sign is：The latent fingerprint of oil includes the latent fingerprint of oil mixing with water.
- It is 3. according to claim 1 a kind of in the positive and negative method for showing latent fingerprint of different hydrophilic and hydrophobic material surfaces, its spy Sign is：The material C NTs that shows is negatively charged CNTs dilutions, and the CTAB solution is the surface with positive charge Activator solution.
- It is 4. according to claim 1 a kind of in the positive and negative method for showing latent fingerprint of different hydrophilic and hydrophobic material surfaces, its spy Sign is：The step of of showing latent fingerprint (3) is the latent fingerprint-fingerprint substrate surface fingerprint region of the oil obtained in step (1) Domain covers CTAB solution, ensures the uniformity of substrate surface solution, and it is upper more to suck the latent fingerprint-fingerprint substrate-CTAB of oil with filter paper Remaining water droplet.
- It is 5. a kind of in the positive and negative method for showing latent fingerprint of different hydrophilic and hydrophobic material surfaces, its feature according to claim 1 It is：Described step (4) is specially：The latent fingerprint of oil-fingerprint substrate-CTAB is immersed in CNTs dilutions, soak time according to Substrate it is different and different；By the latent fingerprint-fingerprint substrate-CTAB-CNTs ultra-pure water soaking flushings of oil, wash away and covered in substrate CNTs, you can show fingerprint.
- It is 6. according to claim 1 a kind of in the positive and negative method for showing latent fingerprint of different hydrophilic and hydrophobic material surfaces, its spy Sign is：The object is one kind in semipermeability and permeable material.
- 7. it is a kind of in the positive and negative method for showing latent fingerprint of different hydrophilic and hydrophobic material surfaces according to claim 1 or 6, its It is characterised by：The object is one kind in pvdf membrane, NC films and fingerprint adhesive tape.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510696438.2A CN105286877B (en) | 2015-10-23 | 2015-10-23 | It is a kind of in the positive and negative method for showing latent fingerprint of different hydrophilic and hydrophobic material surfaces |
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| CN201510696438.2A CN105286877B (en) | 2015-10-23 | 2015-10-23 | It is a kind of in the positive and negative method for showing latent fingerprint of different hydrophilic and hydrophobic material surfaces |
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| CN105286877A CN105286877A (en) | 2016-02-03 |
| CN105286877B true CN105286877B (en) | 2018-01-16 |
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| CN112852409B (en) * | 2020-12-31 | 2024-02-09 | 广东省大湾区华南理工大学聚集诱导发光高等研究院 | Soaking agent based on AIE molecules and capable of displaying latent fingerprints as well as preparation method and application thereof |
| CN114305401B (en) * | 2021-12-17 | 2024-03-15 | 公安部物证鉴定中心 | Three-level characteristic judgment method for displaying fingerprints of various types |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101242783A (en) * | 2005-08-09 | 2008-08-13 | 桑德兰大学 | Hydrophobic silica particles and methods of making same |
| CN101268946A (en) * | 2008-04-30 | 2008-09-24 | 东北师范大学 | Method for latency fingerprint appearance of surface functionalization nano-gold particle |
| CN102757786A (en) * | 2012-07-12 | 2012-10-31 | 陕西师范大学 | Fe3O4/SiO2@ Gd2O3: eu, bi magnetic-fluorescent nanomaterials |
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| US7074310B2 (en) * | 2002-03-04 | 2006-07-11 | William Marsh Rice University | Method for separating single-wall carbon nanotubes and compositions thereof |
| US10095906B2 (en) * | 2014-02-21 | 2018-10-09 | Idex Asa | Sensor employing overlapping grid lines and conductive probes for extending a sensing surface from the grid lines |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101242783A (en) * | 2005-08-09 | 2008-08-13 | 桑德兰大学 | Hydrophobic silica particles and methods of making same |
| CN101268946A (en) * | 2008-04-30 | 2008-09-24 | 东北师范大学 | Method for latency fingerprint appearance of surface functionalization nano-gold particle |
| CN102757786A (en) * | 2012-07-12 | 2012-10-31 | 陕西师范大学 | Fe3O4/SiO2@ Gd2O3: eu, bi magnetic-fluorescent nanomaterials |
Non-Patent Citations (1)
| Title |
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| 血指印检测研究发展;张美芹 等;《应用化学》;20120131;第29卷(第1期);1-8 * |
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