CN104352242A - Method for displaying latent fingerprints by surface-modified aluminum oxide nano particles - Google Patents
Method for displaying latent fingerprints by surface-modified aluminum oxide nano particles Download PDFInfo
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- CN104352242A CN104352242A CN201410683288.7A CN201410683288A CN104352242A CN 104352242 A CN104352242 A CN 104352242A CN 201410683288 A CN201410683288 A CN 201410683288A CN 104352242 A CN104352242 A CN 104352242A
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- aluminum oxide
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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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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/48—Other medical applications
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Abstract
The invention relates to a displaying agent containing surface-modified aluminum oxide nano particles, a of the displaying agent and a method for displaying latent fingerprints by the displaying agent and the kit. The displaying agent disclosed by the invention is prepared by modifying aluminum oxide by a silane coupling agent. Compared with conventional nano particles, the displaying agent has a better surface adsorption effect in a fingerprint displaying process; furthermore, by the adoption of a surface modification group, the displaying agent is higher in specific substance targeted adsorption capacity and is higher in fingerprint displaying sensitivity.
Description
Technical field
The invention belongs to public security Forensic Science field, be specifically related to a kind of containing the visualization reagent of aluminum oxide nanoparticles of surface modification and the method for developing latent finger prints thereof.
Background technology
Fingerprint, there is each one and respectively refer to the features such as the reflection of the stability that different specificity, feature are unchangeable and tactile thing trace, in forensic science, the fingerprint shown is analyzed, identifies, identified, it is the foundation of asserting crime suspect identity, also be the examination of investigation department, disclose and confirm suspect crime the most fast, the most efficient approach, there is the title of " first of material evidence " in global judicial circuit.
Appearing Techniques of Human Fingerprints has multiple process for show, and the principle according to itself and finger mark material association reaction is divided, and mainly contains optical check, powder inspection, chemistry exerts a gradual, corrupting influence on inspection, vacuum coating manifests, radiological techniques appearance method etc.Optical check method mainly contains the methods of inspection such as natural light, laser, multiband light, ultraviolet light, owing to only need can distinguish whether there is finger mark by illumination, finger mark type, form etc., be called as a kind of to finger mark material without the method for inspection damaged.But the enhancing presentation capability of the method to finger mark is limited, and instrument and equipment is expensive, cannot popularize; Powder appearance method is only applicable to relative smooth and inviscid all kinds of object surface, and the humiture of environment, fingerprint time of leaving over etc. all the use of the method is produced and has a strong impact on; Chemistry appearance method, mainly contain silver nitrate, 1,2,3-indantrione monohydrate, DFO method etc., due to these class methods to finger mark manifest highly sensitive, manifest reagent type many, manifest reagent to be combined with finger mark material firmly and process for show various, thus become the process for show of domestic and international forensic science worker favor, the scope of application is wide, frequency is high.But its some inorganic substances manifested in the general and finger mark of reagent react, and these type of inorganic substances distinctive material that is not finger mark and unstable, the effect that the finger mark therefore manifested is not easy to stablize, objective reaction fingerprint unique characteristics and making manifests is undesirable.
Therefore, although developing latent finger prints technology is gradually improved at present, but still many new difficult problems are faced.On the one hand the various furniture, cabinet, vessel etc. that use of people easily left fingerprints bear the formation that the differences such as the wide variety of object, color are numerous and diverse, object concave-convex surface affect fingerprint, these difficult objects all require that fingerprint manifestation has higher sensitivity, and traditional process for show shows slightly unable to do what one wishes; Powder improves the sensitivity of the method usually by the mode reducing powder size in manifesting on the other hand.But powder size is less, the amount that it suspends in atmosphere is larger, and the time of suspension is longer, larger to the physical impairment of professional and technical personnel.The toxic and harmful that some has the fluorescent dye of carcinogenesis simultaneously, smoked aobvious reagent dissociation reaction produces also causes serious harm to the healthy of professional and technical personnel.Therefore, develop a kind of high sensitivity, one of emphasis that the fingerprint on site process for show of Non-toxic will become fingerprint manifestation research.
Nano material can show some special effects when nanoscale due to its particle diameter and be different from the physicochemical characteristics of the special of ordinary matter material and excellence, is easy to be combined with inorganic, the organic species of potential quality India and China.Therefore, for overcoming above-mentioned defect, the object of the present invention is to provide a kind of visualization reagent of the aluminum oxide nanoparticles containing surface modification, colour developing cover box and the method for developing latent finger prints thereof.
Summary of the invention
An object of the present invention is the targets identification function of the dimensional effect mating surface modified group utilizing nano material, with the oils in fingerprint, amino acids species adsorbs, achieve the fingerprint manifestation effect of high sensitivity, Non-toxic.Reagent is manifested by the nano-aluminium oxide preparing surface modification, with oils residual in laten fingerprints, amino acids material generation electrostatic and oriented adsorption effect, deposit at the lines place of fingerprint and present white, being formed can the fingerprint image clearly that arrives of naked eye.
Another object of the present invention be solve during latent fingerprint manifests run into such as bear the reflective interference of object background, susceptiveness that powder manifests is weak, associativity is poor and the problem of range of application restriction.
One aspect of the present invention provides a kind of visualization reagent of the alchlor nano-particle containing surface modification, the preparation method of described visualization reagent comprises: aluminum oxide nanoparticles is put into conical flask, add solvent, add silane coupler again, stirring, water-bath reflux are mixed with white " milky " visualization reagent.
Described silane coupler is selected from the combination of one or two or more kinds in trichlorosilane, KH-570 silane coupler or KH-318 silane coupler.Preferably, described silane coupler is KH-570 silane coupler or KH-318 silane coupler.
Described solvent is selected from water, methanol, ethanol, is preferably distilled water.
The w/v (g/ml) of described aluminum oxide nanoparticles and silane coupler is 25:1-1:1, preferred 10:1-1:1, more preferably 5:1-1:1, more specifically 20:1,15:1,7.5:1,6:1,5:2,3:2.
The w/v (g/ml) of described aluminum oxide nanoparticles and solvent is 1:100-1:10; Preferred 1:70-1:30, more preferably 1:60-1:40, more specifically 3:200,1:20,1:40,1:30.
Described aluminum oxide nanoparticles: solvent: the w/v g/ml/ml of silane coupler is 3-5:100-200:0.2-2, preferred, aluminum oxide nanoparticles: water: the w/v g/ml/ml of silane coupler is 3:150:0.5; Or, aluminum oxide nanoparticles: water: the w/v g/ml/ml of silane coupler is 3.5:150:1; Or, aluminum oxide nanoparticles: water: the w/v g/ml/ml of silane coupler is 4:180:1.5; Or, aluminum oxide nanoparticles: water: the w/v g/ml/ml of silane coupler is 4.5:180:2; Or, aluminum oxide nanoparticles: water: the w/v g/ml/ml of silane coupler is 5:200:2
Temperature during described water-bath is 20-60 DEG C, can be specifically 20 DEG C, 30 DEG C, 40 DEG C, 50 DEG C, 60 DEG C etc.
The time of described heating is 0.5-4h, preferred 1-2h, more specifically 1h, 1.5h, 2h.
The rotating speed of described stirring is 100-1000 rev/min, preferred 400-800 rev/min, more specifically 400 revs/min, 450 revs/min, 500 revs/min, 600 revs/min, 700 revs/min, 800 revs/min.
In the preferred embodiment of the present invention, the visualization reagent adopting specified conditions to prepare in the preparation method of described visualization reagent gem-purely can show laten fingerprints, described preparation method comprises: 3-5g aluminum oxide nanoparticles is put into conical flask, add 100-200ml distilled water, add 0.2-2ml silane coupler again, 20-60 DEG C of water-bath reflux 1-2 hour in magnetic stirring apparatus, setting revolution 400-800 rev/min, is mixed with white " milky " visualization reagent.
More preferred, described preparation method comprises: aluminum oxide nanoparticles: water: the w/v (g/ml/ml) of silane coupler is 3:150:0.5, heating-up temperature is 30 DEG C, heat time heating time is 1h, the rotating speed of agitator is 400 revs/min; Or, aluminum oxide nanoparticles: water: the w/v (g/ml/ml) of silane coupler is 3.5:150:1, heating-up temperature is 40 DEG C, heat time heating time is 1.5h, the rotating speed of agitator is 450 revs/min; Or, aluminum oxide nanoparticles: water: the w/v (g/ml/ml) of silane coupler is 4:180:1.5, heating-up temperature is 40 DEG C, heat time heating time is 2h, the rotating speed of agitator is 500 revs/min; Or, aluminum oxide nanoparticles: water: the w/v (g/ml/ml) of silane coupler is 4.5:180:2, heating-up temperature is 50 DEG C, heat time heating time is 1.5h, the rotating speed of agitator is 600 revs/min; Or, aluminum oxide nanoparticles: water: silane coupler w/v (g/ml/ml) is 5:200:2, heating-up temperature is 60 DEG C, heat time heating time is 2h, the rotating speed of agitator is 800 revs/min.
The present invention also provides a kind of colour developing cover box on the other hand, and it comprises visualization reagent of the present invention, and cationic yellow stain.Cationic yellow stain of the present invention is prepared by following methods: cationic yellow is dissolved in methanol, makes cationic yellow stain.The consumption of described cationic yellow is 0.2-0.6g, and methanol usage is 80-120ml.Preferably, the consumption of described methanol is 100ml.
The present invention also provides a kind of process for show of laten fingerprints on the one hand, it comprises following steps: white " milky " visualization reagent of the present invention is shaken up into emulsus, the material to be checked being suspected to have fingerprint is immersed in liquid rock, or white " milky " visualization reagent of the present invention is dropped in the material surface to be checked being suspected to have fingerprint, after leaving standstill, namely there is fingerprint to show, then wash loose colour off with clear water, natural drying; Draw appropriate cationic yellow stain with suction pipe, be applied to the material surface to be checked being suspected to have fingerprint, then wash removal floating color with water, observe under long-wave ultra violet lamp, fingerprint is in bright trace.
KH-570 of the present invention silane coupler refers to γ-(methacryloxypropyl) propyl trimethoxy silicane, and molecular formula is C
10h
20o
5si; Described KH-318 silane coupler refers to n-octyl group trimethoxy silane, and molecular formula is C
11h
26o
3si.
The mechanism of aluminum oxide nanoparticles surface modification of the present invention is as follows: first silane coupler hydrolysis occurs, and hydrolysis generates silanol base (-SiOH).And then there is dehydration formation oligomer, the hydroxyl on this oligomer and aluminum oxide nanoparticle surface forms hydrogen bond or is condensed into-SiO-M (M is alumina particulate), by heat drying generation dehydration forming section covalent bond, simultaneously, the each intermolecular silanol base of silane is condensation mutually again, oligomerisation forms cancellated film and covers particle surface, the final aluminum oxide nanoparticles forming silane coupler surface modification.Especially, KH-570 of the present invention and KH-318 are owing to having intermediate chain alkyl in molecular structure, the aluminum oxide nanoparticles of the final modification formed has more excellent effect.
The invention has the advantages that: the aluminum oxide nanoparticles after surface modification of the present invention, in fingerprint manifestation process, compare traditional nano-particle and not only there is stronger surface adsorption effect, and due to surface-modifying groups, there is stronger predetermined substance targeting absorbability, there is higher fingerprint manifestation sensitivity.Meanwhile, the method uses solution presentation mode, avoids the generation of nano-particle airborne dust, wholely manifests that process is pollution-free, nonhazardous.Therefore, visualization reagent of the present invention not only effectively can manifest offender and be retained in the difficulty on various carrier, complicated fingerprint, can also overcome existing reagent, the presentation device of manifesting expensive and cannot to popularize and process for show exists the difficult problems such as potential safety hazard.
Accompanying drawing explanation
Fig. 1 be adopt embodiment 1 method to laten fingerprints on whiteware experimental material manifest result.
Fig. 2 be adopt embodiment 1 method to laten fingerprints on glass check material manifest result.
Fig. 3 be adopt embodiment 1 method to laten fingerprints on aluminium foil experimental material manifest result.
Fig. 4 be adopt embodiment 1 method to laten fingerprints on green plastic experimental material manifest result.
Fig. 5 be adopt embodiment 1 method to laten fingerprints on red lacquer painting can experimental material manifest result.
Fig. 6 be adopt embodiment 1 method to laten fingerprints on green lacquer painting can experimental material manifest result.
Fig. 7 adopts embodiment 2 method to manifest comparing result to different silane coupler to laten fingerprints on experimental material, is respectively matched group from left to right, uses test group that KH-318 is silane coupler, uses test group that KH-570 is silane coupler, uses the test group that trichlorosilane is silane coupler.
Detailed description of the invention
Embodiment 1
(1) preparation of the aluminum oxide nanoparticles visualization reagent of KH-570 modification
3g aluminum oxide nanoparticles is put into conical flask; Add 200ml distilled water; Add 0.5ml KH-570 again; 30 DEG C of water-bath reflux 1.5 hours in magnetic stirring apparatus, setting revolution 500 revs/min, is mixed with visualization reagent.
(2) preparation method of cationic yellow stain
Get 0.4g cationic yellow, add 100ml methanol, make cationic yellow stain.
(3) the colour developing cover box of visualization reagent and cationic yellow stain composition is used for manifesting of 6 kinds of material laten fingerprintses to be checked
Visualization reagent prepared by (1) is shaken up into emulsus; The material to be checked of fingerprint will be suspected to have respectively: white ceramic tile, glass, aluminium foil, green plastic sheet, red lacquer painting can surface, green lacquer painting can surface are immersed in developer and constantly rocked, and namely have fingerprint to show;
Loose colour is washed off, natural drying with clear water; With the cationic yellow stain that suction pipe absorption appropriate (2) prepares, be applied to fingerprint surface, then wash removal floating color with water, observe under long-wave ultra violet lamp, fingerprint is in bright yellow green, and concrete outcome is see accompanying drawing 1-6.
Embodiment 2
Different silane coupler manifests contrast test to laten fingerprints
Test group:
(1) 2.5g aluminum oxide nanoparticles is put into conical flask; Add 200ml distilled water; Add a kind of silane coupler in 0.5ml trichlorosilane, KH-570 or KH-318 again; 30 DEG C of water-bath reflux 1.5 hours in magnetic stirring apparatus, setting revolution 700 revs/min, is mixed with visualization reagent.
(2) get 0.4g cationic yellow, add 100ml methanol, make cationic yellow stain.
(3) visualization reagent prepared by (1) is shaken up into emulsus; Respectively the material to be checked being suspected to have fingerprint of identical material is immersed in developer and constantly rock, namely have fingerprint to show; Loose colour is washed off, natural drying with clear water; With the cationic yellow stain that suction pipe absorption appropriate (2) prepares, be applied to fingerprint surface, then wash removal floating color with water, observe under long-wave ultra violet lamp.
Matched group:
(1) 2.5g aluminum oxide nanoparticles is put into conical flask, add 200ml distilled water, be mixed with visualization reagent.
(2) get 0.4g cationic yellow, add 100ml methanol, make cationic yellow stain.
(3) visualization reagent prepared by (1) is shaken up into emulsus; The material to be checked being suspected to have fingerprint with test group identical material is immersed in developer and constantly rocks, namely have fingerprint to show; Loose colour is washed off, natural drying with clear water; With the cationic yellow stain that suction pipe absorption appropriate (2) prepares, be applied to fingerprint surface, then wash removal floating color with water, observe under long-wave ultra violet lamp.
Result of the test:
As Fig. 7 display, be respectively matched group from left to right, the test group that uses KH-318 to be silane coupler, use test group that KH-570 is silane coupler, use the test group that trichlorosilane is silane coupler.
Make to detect by an unaided eye and to grade to manifesting result:
"+" represents the rank of fingerprint clear, and it is higher that "+" represents fingerprint clear degree more.
Embodiment 3-10
Identical step is adopted to prepare similar visualization reagent, wherein process conditions carry out suitable change, the preparation method of cationic yellow stain with embodiment 1, and adopts process for show identical in embodiment 1 to carry out manifesting laten fingerprints, and concrete situation and effect please see the following form:
Embodiment 11-18
The step identical with embodiment 1 is adopted to prepare similar visualization reagent, wherein process conditions carry out suitable change, the preparation method of cationic yellow stain with embodiment 1, and adopts process for show identical in embodiment 1 to carry out manifesting laten fingerprints, and concrete situation and effect please see the following form:
Claims (10)
1. the visualization reagent containing surface modification alchlor nano-particle, it is characterized in that: its preparation method comprises the steps: aluminum oxide nanoparticles to put into conical flask, add solvent, then add silane coupler, stirring, water-bath reflux are mixed with white " milky " visualization reagent.
2. a visualization reagent according to claim 1, is characterized in that: described silane coupler is selected from trichlorosilane, KH-570 silane coupler or KH-318 silane coupler.
3. a visualization reagent according to claim 1, is characterized in that: described solvent is water, ethanol or methanol.
4. a visualization reagent according to claim 3, is characterized in that: described solvent is distilled water.
5. a visualization reagent according to claim 1, it is characterized in that: aluminum oxide nanoparticles in described preparation method: solvent: the w/v g/ml/ml of silane coupler is 3-5:100-200:0.2-2, heating-up temperature is 20-60 DEG C, heat time heating time is 1-2h, and in whipping process, agitator speed is 400-800 rev/min.
6. a visualization reagent according to claim 1, it is characterized in that: its preparation method comprises: 3-5g aluminum oxide nanoparticles is put into conical flask, add 100-200ml distilled water, add 0.2-2ml silane coupler again, 20-60 DEG C of water-bath reflux 1-2 hour in magnetic stirring apparatus, setting agitator speed 400-800 rev/min stirs, and is mixed with white " milky " visualization reagent.
7. a visualization reagent according to claim 6, it is characterized in that, aluminum oxide nanoparticles in its preparation method: water: the w/v g/ml/ml of silane coupler is 3:150:0.5, and heating-up temperature is 30 DEG C, heat time heating time is 1h, the rotating speed of agitator is 400 revs/min;
Or, aluminum oxide nanoparticles: water: the w/v g/ml/ml of silane coupler is 3.5:150:1, heating-up temperature is 40 DEG C, heat time heating time is 1.5h, the rotating speed of agitator is 450 revs/min;
Or, aluminum oxide nanoparticles: water: the w/v g/ml/ml of silane coupler is 4:180:1.5, heating-up temperature is 40 DEG C, heat time heating time is 2h, the rotating speed of agitator is 500 revs/min;
Or, aluminum oxide nanoparticles: water: the w/v g/ml/ml of silane coupler is 4.5:180:2, heating-up temperature is 50 DEG C, heat time heating time is 1.5h, the rotating speed of agitator is 600 revs/min;
Or, aluminum oxide nanoparticles: water: the w/v g/ml/ml of silane coupler is 5:200:2, heating-up temperature is 60 DEG C, heat time heating time is 2h, the rotating speed of agitator is 800 revs/min.
8. a colour developing cover box, it is characterized in that: described cover box comprises the arbitrary described visualization reagent of claim 1-7, and cationic yellow stain, the preparation method of described cationic yellow stain comprises: be dissolved in by cationic yellow in methanol, make cationic yellow stain, the consumption of described cationic yellow is 0.2-0.6g, and methanol usage is 80-120ml.
9. a process for show for laten fingerprints, is characterized in that, comprises following steps:
Arbitrary for claim 1-7 described visualization reagent is shaken up into emulsus; The material to be checked being suspected to have fingerprint is immersed in emulsus developer rock, or emulsus visualization reagent is dropped in the material surface to be checked being suspected to have fingerprint, after leaving standstill, namely have fingerprint to show; Wash loose colour off with clear water, natural drying, draw cationic yellow stain, be applied to fingerprint surface, then wash removal floating color with water, observe under long-wave ultra violet lamp with suction pipe, fingerprint is in bright color mark; The preparation method of described cationic yellow stain comprises: be dissolved in by cationic yellow in methanol, makes cationic yellow stain, and the consumption of described cationic yellow is 0.2-0.6g, and methanol usage is 80-120ml.
10. the process for show of laten fingerprints according to claim 9, is characterized in that, the described material to be checked being suspected to have fingerprint is the one in metal, pottery, glass, plastics.
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Cited By (1)
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| WO2018193669A1 (en) * | 2017-04-19 | 2018-10-25 | キンセイマテック株式会社 | Fingerprint detection powder |
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