CN105286877A - Method for positively and negatively displaying latent fingerprints on surfaces of materials having different hydrophilic and hydrophobic properties - Google Patents
Method for positively and negatively displaying latent fingerprints on surfaces of materials having different hydrophilic and hydrophobic properties Download PDFInfo
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- CN105286877A CN105286877A CN201510696438.2A CN201510696438A CN105286877A CN 105286877 A CN105286877 A CN 105286877A CN 201510696438 A CN201510696438 A CN 201510696438A CN 105286877 A CN105286877 A CN 105286877A
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Abstract
The invention discloses a method for positively and negatively displaying latent fingerprints on surfaces of materials having different hydrophilic and hydrophobic properties, and belongs to the technical field of fingerprint identification. According to the method, latent fingerprints printed on the surfaces of the materials having different hydrophilic and hydrophobic properties are immersed in a CTAB solution with positive charges and a CNTs solution with negative charges in order, and the latent fingerprints are displayed based on a hydrophilic and hydrophobic principle and an electrostatic adsorption principle. Compared with the prior art employing chemical deposition and small particle suspension, the latent fingerprints can be positively and negatively displayed according to the hydrophilic and hydrophobic property of a base material, and the method is suitable for displaying the latent fingerprints on the surfaces of multiple common semi-permeable and permeable objects. The method is easy to operate, raw materials are environment-friendly and can be easily obtained, the process is rapidly carried out, high repeatability is achieved, and the latent fingerprints can be detected on site without large instruments.
Description
Technical field
The invention belongs to technique of fingerprint indentification field, relate to and adopt electronegative CNT (CNTs) diluent and cetyl trimethyl ammonium bromide (CTAB) solution, manifest the method for laten fingerprints at different hydrophilic and hydrophobic material surface (pvdf membrane, NC film and fingerprint adhesive tape etc.).
Background technology
Fingerprint, also referred to as the lines of the hand.Because the many factors such as hereditary material, skin texture, pathology and trauma affect determine the specificity of fingerprint ridge, multiformity and stability, there is people variant, the feature of unchangeable and tactile thing trace.In flagrant delict, common fingerprint is divided three classes: obviously stricture of vagina, molding stricture of vagina and laten fingerprints, wherein laten fingerprints is visual not easily finds, being a modal class fingerprint in spot, is object of study herein.Developing latent finger prints plays an important role to clear up a criminal case, can be used for distinguishing the every field such as identity, safety detection and medical diagnosis.Therefore, science correctly finds, extract, manifest qualification fingerprint, for carrying out investigation and safety detection is significant.
The method of current detection laten fingerprints mainly contains silver nitrate method, ninhydrin method, iodine fumigation and 502 glue and smokes traditional chemical appearance method and the physicochemical appearance methods such as aobvious method.For traditional appearance method, there is following shortcoming: the health of the article such as reagent to operator has harm; Manifest effect obvious not, generally can only manifest the primary structure of fingerprint, it is undesirable that secondary structure manifests effect; Certain destructiveness is had to laten fingerprints; Not there is presentation capability to the laten fingerprints on some difficult objects; Erect image or the single figure of reverted image can only be shown.Along with the development of analytical technology, some methods of carrying out developing latent finger prints based on New technical use are arisen at the historic moment, as electrochemical method, x-ray fluorescence method, Fourier's infrared ray diffraction spectrographic method and mass spectrography etc.But these Appearing Techniques of Human Fingerprints need to adopt expensive precision instrument and the training of special expertise usually, are not suitable for the developing latent finger prints of scene of a crime and the popularization and application of method.
The present invention is in order to overcome above-mentioned Problems existing, and exploration novel nano-material CNTs and surfactant combine innovatively, utilize the hydrophilic and hydrophobic of different materials and electrostatic absorption principle to manifest laten fingerprints.CNT (CNTs) is a kind of One-dimensional Quantum material with special construction, forms the coaxial pipe of several layers to tens of layers primarily of the carbon atom in hexagonal array.Cetyl trimethyl ammonium bromide (CTAB), is soluble in isopropyl alcohol, water soluble, is a kind of cationic surfactant, is widely used in the aspects such as moistening, sterilization, antistatic, decontamination, solubilising.Substrate PVDF membrane (pvdf membrane), surface hydrophobicity, has higher mechanical strength, and the protein of separable small fragment is mainly used in western blotting, is a kind of conventional solid support.Nitrocellulose filter (NC film), has very strong hydrophilic, is used as the supporting body of C/T line in colloid gold test paper, and be also immunoreactive nidus, NC film is one of most important consumptive material in biological test simultaneously.Fingerprint adhesive tape can be used for shifting the finger mark on various difficult object, and then manifests.The present invention is simple to operate, and raw material environmental protection is easy to get, and process is quick, reproducible, does not need by large-scale instrument, can be used for Site Detection laten fingerprints.Therefore, the method has fabulous actual application value in fingerprint identification field.
Summary of the invention
The object of the invention is: develop a kind of step simple, economic environmental protection, can be used for the process for show of Site Detection laten fingerprints.First innovatively by novel nano-material---CNTs is applied to manifesting of laten fingerprints, with electronegative CNTs and cationicsurfactants for manifesting material, utilize hydrophilic and hydrophobic and electrostatic absorption principle, positive and negatively manifest laten fingerprints on different hydrophilic and hydrophobic material (pvdf membrane, NC film and fingerprint adhesive tape etc.) surface.Concrete steps are as follows:
(1) by oily laten fingerprints lightly by being pressed in object surface, obtain oily laten fingerprints-fingerprint substrate;
(2) CTAB solution and CNTs diluent is configured;
(3) CTAB solution is added drop-wise to laten fingerprints substrate surface, reaction 10min, obtains oily laten fingerprints-fingerprint substrate-CTAB;
(4) the oily laten fingerprints with the positive charge-fingerprint substrate-CTAB obtained in step (3) is immersed in CNTs diluent, reaction 5-10min, take out rear ultrapure water, under natural light, with the naked eye can observe directly fingerprint pattern clearly;
(5) the oily laten fingerprints manifested in step (4)-fingerprint substrate-CTAB-CNTs is positioned on horizontal, to take pictures fixed extraction fingerprint image with digital camera.
Wherein, described in manifest material C NTs be any electronegative CNTs diluent, described CTAB is any surfactant solution with positive charge.
Above-mentioned step (3) is that the oily laten fingerprints-fingerprint substrate surface finger-print region obtained in step (1) covers CTAB, ensure the uniformity of substrate surface solution, react 10min under room temperature, suck the upper unnecessary water droplet of oily laten fingerprints-fingerprint substrate-CTAB with filter paper.
Above-mentioned step (4) specifically comprises: immerse in electronegative CNTs diluent by oily laten fingerprints-fingerprint substrate-CTAB, and soak time is different according to different base; By oily laten fingerprints-fingerprint substrate-CTAB-CNTs ultra-pure water soaking flushing, wash away the CNTs that substrate covers, can fingerprint be shown.
Above-mentioned manifested laten fingerprints, except oily laten fingerprints, can also be oil mixing with water laten fingerprints.
Object described in said method is any semipermeability and permeable material, comprises pvdf membrane, NC film and fingerprint adhesive tape etc.
The beneficial effect of technique scheme of the present invention is as follows:
The method according to the difference of material character, can manifest positive inverse video; Method is with low cost, is easy to popularize; Simple to operate, manifest fast, not by any main equipment, and for fingerprint Site Detection; Manifest the laten fingerprints excellent of tape surface, this advantage can directly apply to extracts from surfaces of various materials the laten fingerprints detection come, and is not suitable for the fingerprint of Site Detection on raw material by manifesting after the method transfer to some, convenient and practical.
Accompanying drawing explanation
Fig. 1 is the present invention take pvdf membrane as the developing latent finger prints effect picture that object obtains, and left figure is the ordinary optical image after developing latent finger prints, the characteristic information figure of fingerprint second level that the right provides for left figure.
To be the present invention stick with fingerprint adhesive tape the effect picture that face object laten fingerprints obtains to Fig. 2.
Fig. 3 is the effect picture that the present invention obtains with NC film object laten fingerprints, and left figure is the ordinary optical image after developing latent finger prints, the characteristic information figure of fingerprint second level that the right provides for left figure.
Detailed description of the invention
Further illustrate the present invention below in conjunction with example, this example only for illustrating, and is not limited to practical ranges of the present invention.
Embodiment 1
For the developing latent finger prints on pvdf membrane surface, concrete operations have following steps:
(1) pvdf membrane shears is cut into 1.5 × 2cm size, is placed on for subsequent use in the plastic culture dish of ethanol scrub;
(2) oily laten fingerprints is surperficial by being pressed in pvdf membrane object lightly, obtain oily laten fingerprints-pvdf membrane;
(3) CTAB solution and CNTs diluent is configured;
(4) CTAB solution is added drop-wise to laten fingerprints substrate surface, reaction 10min, obtains oily laten fingerprints-pvdf membrane-CTAB;
(5) immerse in CNTs diluent by the oily laten fingerprints with the positive charge-pvdf membrane-CTAB obtained in step (4), reaction 5min, takes out rear ultrapure water, under natural light, with the naked eye can observe directly fingerprint clearly; Oily laten fingerprints-pvdf membrane-the CTAB-CNTs manifested is positioned on horizontal, manifests fingerprint image with digital camera collection of taking pictures.As Fig. 1.
Embodiment 2
For the developing latent finger prints on NC film surface, concrete operations have following steps:
(1) NC film shears is cut into 1.5 × 2cm size, is placed on for subsequent use in the plastic culture dish of ethanol scrub;
(2) oily laten fingerprints is surperficial by being pressed in NC film object lightly, obtain oily laten fingerprints-NC film;
(3) CTAB solution and CNTs diluent is configured;
(4) CTAB solution is added drop-wise to laten fingerprints substrate surface, reaction 10min, obtains oily laten fingerprints-NC film-CTAB;
(5) immerse in CNTs diluent by the oily laten fingerprints-NC film-CTAB with positive charge obtained in step (4), reaction 10min, takes out rear ultrapure water, under natural light, with the naked eye can observe directly fingerprint clearly; Oily laten fingerprints-NC film-the CTAB-CNTs manifested is positioned on horizontal, manifests fingerprint image with digital camera collection of taking pictures.As Fig. 3.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1. one kind in the positive and negative method manifesting laten fingerprints of different hydrophilic and hydrophobic material surface, it is characterized in that, successively fingerprint substrate is immersed in cationic surfactant cetyl trimethyl ammonium bromide CTAB solution and electronegative CNT CNTs diluent, utilizes hydrophilic and hydrophobic and electrostatic absorption principle to manifest; Concrete steps are as follows:
(1) by oily laten fingerprints lightly by being pressed in object surface, obtain oily laten fingerprints-fingerprint substrate;
(2) CTAB solution and CNTs diluent is configured;
(3) CTAB solution is added drop-wise to laten fingerprints substrate surface, reaction 10min, obtains oily laten fingerprints-fingerprint substrate-CTAB;
(4) the oily laten fingerprints with the positive charge-fingerprint substrate-CTAB obtained in step (3) is immersed in CNTs diluent, reaction 5-10min, take out rear ultrapure water, under natural light, with the naked eye can observe directly fingerprint clearly;
(5) the oily laten fingerprints manifested in step (4)-fingerprint substrate-CTAB-CNTs is positioned on horizontal, fingerprint image is manifested with digital camera collection of taking pictures.
2. according to claim 1 a kind of in the positive and negative method manifesting laten fingerprints of different hydrophilic and hydrophobic material surface, it is characterized in that: described oily laten fingerprints comprises oil mixing with water laten fingerprints.
3. according to claim 1 a kind of in the positive and negative method manifesting laten fingerprints of different hydrophilic and hydrophobic material surface, it is characterized in that: described in manifest material C NTs be any electronegative CNTs diluent, described CTAB solution is any surfactant solution with positive charge.
4. according to claim 1 a kind of in the positive and negative method manifesting laten fingerprints of different hydrophilic and hydrophobic material surface, it is characterized in that: described in manifest laten fingerprints step (3) be that the oily laten fingerprints-fingerprint substrate surface finger-print region obtained in step (1) covers CTAB solution, ensure the uniformity of substrate surface solution, suck the upper unnecessary water droplet of oily laten fingerprints-fingerprint substrate-CTAB with filter paper.
5. a kind of in the positive and negative method manifesting laten fingerprints of different hydrophilic and hydrophobic material surface according to claim 1, it is characterized in that: described step (4) is specially: immersed in CNTs diluent by oily laten fingerprints-fingerprint substrate-CTAB, soak time is different according to the difference of substrate; By oily laten fingerprints-fingerprint substrate-CTAB-CNTs ultra-pure water soaking flushing, wash away the CNTs that substrate covers, can fingerprint be shown.
6. according to claim 1 a kind of in the positive and negative method manifesting laten fingerprints of different hydrophilic and hydrophobic material surface, it is characterized in that: described object is any semipermeability and permeable material.
7. a kind of in the positive and negative method manifesting laten fingerprints of different hydrophilic and hydrophobic material surface according to claim 1 or 6, is characterized in that: described object is pvdf membrane, NC film and fingerprint adhesive tape.
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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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112852409A (en) * | 2020-12-31 | 2021-05-28 | 广东省大湾区华南理工大学聚集诱导发光高等研究院 | Latent fingerprint display soaking agent based on AIE molecules and preparation method and application thereof |
| CN114305401A (en) * | 2021-12-17 | 2022-04-12 | 公安部物证鉴定中心 | Three-level characteristic judgment method for displaying various types of fingerprints |
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| 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 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112852409A (en) * | 2020-12-31 | 2021-05-28 | 广东省大湾区华南理工大学聚集诱导发光高等研究院 | Latent fingerprint display soaking agent based on AIE molecules and preparation method and application thereof |
| 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 |
| CN114305401A (en) * | 2021-12-17 | 2022-04-12 | 公安部物证鉴定中心 | Three-level characteristic judgment method for displaying various types of fingerprints |
| 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 |
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