CN106865615B - A kind of preparation of copper/chromium composite black nanometer powder and its finger mark process for show - Google Patents
A kind of preparation of copper/chromium composite black nanometer powder and its finger mark process for show Download PDFInfo
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- CN106865615B CN106865615B CN201710078917.7A CN201710078917A CN106865615B CN 106865615 B CN106865615 B CN 106865615B CN 201710078917 A CN201710078917 A CN 201710078917A CN 106865615 B CN106865615 B CN 106865615B
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- 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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- C09K11/67—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing refractory metals
- C09K11/68—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing refractory metals containing chromium, molybdenum or tungsten
- C09K11/681—Chalcogenides
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Abstract
The present invention proposes preparation and its finger mark process for show of a kind of copper/chromium composite black nanometer powder.The preparation method comprises the following steps：S1, prepare copper chromium salt solution；S2, prepare citric acid solution；S3, prepare copper chrome lemon hydrochlorate；S4, prepare gel；S5 prepares precursor powder；S6, Muffle furnace calcining.The finger mark process for show of the present invention includes directly brushing aobvious method, and aobvious method and the aobvious method of suspension spray are trembled in dusting.The present invention has following advantageous effects：It is good to the fingerprint displaying effect in oldness impression of the hand and permeability object；Product possesses environmentally protective feature, harmless to operator；Preparation method is simple and practicable, application easy to spread.
Description
Technical field
The present invention relates to public security criminal technique finger mark to identify field, more particularly to a kind of copper/chromium composite black nanometer powder
Preparation and its finger mark process for show.
Background technology
Impression of the hand is human contact's object and in the reflecting image of contact surface surface structure left by body surface；And finger
Line has people variant, the characteristics of being basically unchanged throughout one's life.Therefore, individual can directly be assert according to impression of the hand.In solving criminal cases and
Impression of the hand, which can play, in trial provides investigation clue, provides the important function for solving a case and trying evidence.It can be seen from the above that latent fingerprint
Appearing technique is the precondition and guarantee for being disclosed and being confirmed crime using impression of the hand.At present, powder method and small-particle suspension method are because of behaviour
Make simple, preparation simply, become scene and show impression of the hand most efficient method.Then, currently used powder, such as bronze, it is magnetic
Powder etc. can not be combined fully, therefore the impression of the hand in oldness impression of the hand and permeability object is shown because particle diameter is larger with impression of the hand material
It is existing ineffective.To improve the sensitivity of finger mark detection, researcher utilizes some semiconductor nanos（Quantum dot）, rare earth material
Show potential impression of the hand Deng as fluorometric reagent, though obtaining better effects, how toxic such reagent is, and need to be set by means of complexity
Standby, operation sequence is cumbersome, is not easy to the popularization of engineering department of basic unit.Also there are the noble metal nanometer materials such as partial report gold, silver can
The sensitivity that Bio-imprinting shows is improved, but this method is of high cost, is currently limited to laboratory stage.
As it can be seen that in existing finger mark appearing technique, there is problems with：
1st, conventional powder method is ineffective to the fingerprint displaying in oldness impression of the hand and permeability object.
2nd, semiconductor nano（Quantum dot）Or rare earth material is toxic, and need to by means of complex device, operation sequence compared with
It is cumbersome, it is not easy to the popularization of engineering department of basic unit.
3rd, the noble metal nanometer material such as gold, silver is of high cost, is currently limited to laboratory stage.
The content of the invention
In order to solve existing for existing conventional powder method to the fingerprint displaying effect in oldness impression of the hand and permeability object
The problem of bad, the present invention propose preparation and its finger mark process for show of a kind of copper/chromium composite black nanometer powder.
A kind of preparation of copper/chromium composite black nanometer powder of the present invention, comprises the following steps：
S1, prepare copper-chromium salt solution：Cu (the N0 of 24.2g are weighed respectively3)2·3H2Cr (the N0 of 0 and 80g3)3·9H20
Solid, is made into 200mL hybrid metal saline solutions, ultrasonic mixing is uniform, and transfers them in flask；
S2, prepare citric acid solution：Weigh 76.9g citric acid solid, will its be made into 200mL aqueous solutions；
S3, prepare copper-chrome lemon hydrochlorate：The flask of step S1 is placed in thermostat water bath, it is 85 to set bath temperature
DEG C, under strong stirring, citric acid solution obtained by step S2 is slowly instilled by flask by dropping funel, until dripping
Finish；
S4, prepare gel：The surfactant of 5.21g is added in the copper obtained by step S3-chrome lemon hydrochlorate
PEG400, continues to stir, and until moisture is evaporated in solution, forms the gel of clear, stops stirring；
S5 prepares precursor powder：Gel obtained by step S4 is placed in vacuum drying chamber, in 95 DEG C of dry 1h, can be obtained
Bottle green xerogel, precursor powder is can be prepared by by xerogel grind into powder；
S6, Muffle furnace calcining：Precursor powder obtained by step S5 is placed in Muffle furnace, is calcined simultaneously at 700 DEG C
1h is kept the temperature, room temperature is finally cooled to, that is, obtains CuCr2O4Black nano powder.
Further, in the step S4, when mixing time is 4 small.
Present invention additionally comprises the finger mark process for show of above-mentioned copper/chromium composite black nanometer powder, including aobvious method is directly brushed, spread
Powder trembles aobvious method and the aobvious method of suspension spray.
Further, the aobvious method of directly brush, including, amount of copper/chromium composite black nanometer powder is dipped with fingerprint brush,
Swept from the bottom up along vertical roofing, powder is adhered to object plane, after streakline is seen, the powder that hair loss paints is played, with hair
The flow direction brushed along streakline is shown along a direction brush, until streakline is clear；This method is suitable for diving on smooth impermeability object
In showing for impression of the hand.
Further, aobvious method is trembled in the dusting, including, amount of copper/chromium composite black nanometer powder is dipped with fingerprint brush,
Attack brush holder makes powder be covered in object plane；Then both hands, which hold two relative edges of object, makes it shake up and down, allows powder to streak doubtful
There is the object plane of impression of the hand, you can show impression of the hand；Excessive powder is withdrawn into container, then gently the attack object back side shakes off and floats on small plough
Powder in ditch；This method is suitable for permeability or the semipermeability objects such as paper, true qualities wood.
Further, the aobvious method of suspension spray：Comprise the following steps：
S1, suspension preparation：First the neopelex of 0.5 g is dissolved in 50 mL deionized waters, is stirred
After being completely dissolved to surfactant sodium dodecyl base benzene sulfonic acid sodium salt, copper/chromium composite black nanometer powder CuCr of 5 g is added2O4
With 50 mL deionized waters, stirring is until powder is uniformly dispersed, is not stratified.
S2, spray are aobvious：With the spray bottle equipped with suspension to carry out spray at blood latent fingerprint 20cm aobvious, solution is set to be filled with sample
Tap is touched, and is observed again after slowly being rinsed with clear water after 30s and is shown effect, the repetitive operation if ineffective, until showing reason
Sample is dried up with hair dryer after thinking effect.
Copper/chromium composite black nanometer powder prepared by this method has certain dispersiveness in organic phase, residual with impression of the hand
Stay thing binding ability stronger；Its particle diameter is small, good with impression of the hand residue adhesiveness in nanoscale；And this compound is due to choosing
Selecting property is high, and adhesive attraction only occurs with the grease on impression of the hand streakline or hemoglobin, can reduce handprint images background interference
Effect, strengthens contrast.Although powder is made of metallic elements such as titanium, cobalts, the two passes through high temperature sintering, has formed gold
Belong to ion solid solution, will not be separated out under normal temperature and pressure, therefore possess environmentally protective feature, it is harmless to operator.Therefore present invention tool
There are following advantageous effects：
1st, it is good to the fingerprint displaying effect in oldness impression of the hand and permeability object.
2nd, product possesses environmentally protective feature, harmless to operator.
3rd, preparation method is simple and practicable, application easy to spread.
Brief description of the drawings
Fig. 1 is the X-ray diffraction spectrogram of copper/chromium composite black nanometer powder prepared by the present invention.
Fig. 2 is the transmission electron microscope picture of copper/chromium composite black nanometer powder prepared by the present invention.
Fig. 3 is the elemental analysis figure of copper/chromium composite black nanometer powder prepared by the present invention.
Fig. 4 is that copper/chromium composite black nanometer powder prepared by the present invention shows design sketch for diving hand print with perspiration on paper.
Fig. 5 is that copper/chromium composite black nanometer powder prepared by the present invention shows design sketch for diving hand print with perspiration on ceramic tile.
Fig. 6 is that copper/chromium composite black nanometer powder prepared by the present invention shows effect for blood latent fingerprint on artificial leather
Figure.
Fig. 7 is that copper/chromium composite black nanometer powder prepared by the present invention shows design sketch for blood latent fingerprint on plastics.
Embodiment
Fig. 1 is the X-ray diffraction spectrogram of copper/chromium composite black nanometer powder prepared by the present invention, which shows mainly
Crystal face characteristic diffraction peak and standard card JCPDS：34-0424 is basically identical.
Fig. 2 is the transmission electron microscope picture of copper/chromium composite black nanometer powder prepared by the present invention.The prepared powder of display
Particle diameter is mainly distributed 50 rans, and dispersiveness is preferably.
Fig. 3 is the elemental analysis figure of copper/chromium composite black nanometer powder prepared by the present invention.Show powder by copper, chromium,
Three kinds of element compositions of oxygen, compositional purity is high, free from admixture.
Fig. 4 is that copper/chromium composite black nanometer powder prepared by the present invention shows design sketch for diving hand print with perspiration on paper,
Fig. 5 is that copper/chromium composite black nanometer powder prepared by the present invention shows design sketch for diving hand print with perspiration on ceramic tile, and Fig. 6 is this
Prepared copper/chromium composite black the nanometer powder of invention is used for blood latent fingerprint on artificial leather and shows design sketch, and Fig. 7 is institute of the present invention
The copper of preparation/chromium composite black nanometer powder is used for blood latent fingerprint on plastics and shows design sketch.From Fig. 4-Fig. 7：The present invention
The effect that prepared copper/chromium composite black nanometer powder shows outmoded finger mark is good, its finger mark mastoid process streakline is smooth, spillikin, small
The minutias such as point protrude, and reagent is shown better than traditional powder.
Embodiment 1：
The preparation of copper/chromium composite black nanometer powder, comprises the following steps：
S1, to prepare copper-chromic salts molten：Cu (the N0 of 24.2g are weighed respectively3)2·3H2Cr (the N0 of 0 and 80g3)3·9H20 is solid
Body, is made into 200mL hybrid metal saline solutions, ultrasonic mixing is uniform, and transfers them in flask；
S2, prepare citric acid solution：Weigh 76.9g citric acid solid, will its be made into 200mL aqueous solutions；
S3, prepare copper-chrome lemon hydrochlorate：The flask of step S1 is placed in thermostat water bath, it is 85 to set bath temperature
DEG C, under strong stirring, citric acid solution obtained by step S2 is slowly instilled by flask by dropping funel, until dripping
Finish；
S4, prepare gel：The surfactant of 5.21g is added in the copper obtained by step S3-chrome lemon hydrochlorate
PEG400, continues to stir, and until moisture is evaporated in solution, forms the gel of clear, stops stirring；Wherein, PEG400 is used
As stabilizing agentof sol；When the mixing time for preparing gel is 4 small；
S5, prepare precursor powder：Gel obtained by step S4 is placed in vacuum drying chamber, can in 95 DEG C of dry 1h
Bottle green xerogel is obtained, xerogel grind into powder be can be prepared by into precursor powder；
S6, Muffle furnace calcining：Precursor powder obtained by step S5 is placed in Muffle furnace, is calcined simultaneously at 700 DEG C
1h is kept the temperature, room temperature is finally cooled to, that is, obtains CuCr2O4Black nano powder.
Embodiment 2：
By the finger mark process for show of the copper obtained by the present invention/chromium composite black nanometer powder：
Directly brush aobvious method：Appropriate powder is dipped with fingerprint brush, is swept from the bottom up along vertical roofing, adheres to powder
In object plane, after streakline is seen, the powder that hair loss paints is played, the flow direction along streakline is aobvious along a direction brush, until streakline
Clearly.
Embodiment 3：
By the finger mark process for show of the copper obtained by the present invention/chromium composite black nanometer powder：
Aobvious method is trembled in dusting：Appropriate powder is dipped with fingerprint brush, attack brush holder makes powder be covered in object plane；Then both hands
Holding two relative edges of object makes it shake up and down, allows powder to streak the object plane for being suspected to have impression of the hand, you can to show impression of the hand.Will be unnecessary
Powder withdraws container, then gently the powder floated in small ditch dug with a plow is shaked off at the attack object back side.
Embodiment 4：
By the finger mark process for show of the copper obtained by the present invention/chromium composite black nanometer powder：
The aobvious method of suspension spray：Comprise the following steps：
S1, suspension preparation：First the neopelex of 0.5 g is dissolved in 50 mL deionized waters, is stirred
After being completely dissolved to surfactant sodium dodecyl base benzene sulfonic acid sodium salt, copper/chromium composite black nanometer powder of 5 g is added
CuCr2O4With 50 mL deionized waters, stirring is until powder is uniformly dispersed, is not stratified.
S2, spray are aobvious：With the spray bottle equipped with suspension to carry out spray at blood latent fingerprint 20cm aobvious, solution is set to be filled with sample
Tap is touched, and is observed again after slowly being rinsed with clear water after 30s and is shown effect, the repetitive operation if ineffective, until showing reason
Sample is dried up with hair dryer after thinking effect.
Copper/chromium composite black nanometer powder prepared by this method can fast and efficiently show outmoded finger mark.The preparation method
It is simple for process, application easy to spread；Its particle diameter is small, good with impression of the hand residue adhesiveness in nanoscale；It is and this compound
Thing only occurs adhesive attraction with the grease on impression of the hand streakline or hemoglobin, can reduce the handprint images back of the body due to high selectivity
The effect of scape interference, strengthens contrast, so the good developing effect to outmoded finger mark.Although powder is by the metals such as titanium, cobalt member
Element composition, but the two passes through high temperature sintering, has formed metal ion solid solution, will not have been separated out under normal temperature and pressure, therefore possess green
Color characteristic of environmental protection, it is harmless to operator.
Finally, it should also be noted that it is listed above be only the present invention several specific embodiments.Obviously, this hair
It is bright to be not limited to above example, what those of ordinary skill in the art directly can export or associate from present disclosure
All technical solutions, are considered as within protection scope of the present invention.
Claims (4)
- A kind of 1. finger mark process for show, it is characterised in that finger mark is carried out using copper/chromium composite black nanometer powder and is shown, including Aobvious method is directly brushed, aobvious method and the aobvious method of suspension spray are trembled in dusting；The copper/chromium composite black nanometer powder is by following preparation method system It is standby to form：S1, prepare copper-chromium salt solution：Cu (the N0 of 24.2g are weighed respectively3)2·3H2Cr (the N0 of 0 and 80g3)3·9H20 solid, 200mL hybrid metal saline solutions are made into, ultrasonic mixing is uniform, and transfers them in flask；S2, prepare citric acid solution：Weigh 76.9g citric acid solid, will its be made into 200mL aqueous solutions；S3, prepare copper-chrome lemon hydrochlorate：The flask of step S1 is placed in thermostat water bath, it is 85 DEG C to set bath temperature, Under strong stirring, citric acid solution obtained by step S2 is slowly instilled by flask by dropping funel, until being added dropwise；S4, prepare gel：The Surfactant PEG 400 of 5.21g is added in the copper obtained by step S3-chrome lemon hydrochlorate, after Continuous stirring, until moisture is evaporated in solution, forms the gel of clear, stops stirring；S5, prepare precursor powder：Gel obtained by step S4 is placed in vacuum drying chamber, in 95 DEG C of dry 1h, depth can be obtained Green xerogel, precursor powder is can be prepared by by xerogel grind into powder；S6, Muffle furnace calcining：Precursor powder obtained by step S5 is placed in Muffle furnace, calcines and keeps the temperature at 700 DEG C 1h, is finally cooled to room temperature, that is, obtains CuCr2O4Black nano powder.
- 2. according to the finger mark process for show described in claim 1, it is characterised in that the aobvious method of directly brush, including, use fingerprint Hairbrush dips amount of copper/chromium composite black nanometer powder, is swept from the bottom up along vertical roofing, powder is adhered to object plane, After streakline is seen, the powder that hair loss paints is played, it is aobvious along a direction brush along the flow direction of streakline with hairbrush, until streakline is clear It is clear；This method is suitable for potential impression of the hand on smooth impermeability object and shows.
- 3. according to the finger mark process for show described in claim 1, it is characterised in that：Aobvious method is trembled in the dusting, including, use fingerprint Hairbrush dips amount of copper/chromium composite black nanometer powder, and attack brush holder makes powder be covered in object plane；Then both hands hold object two A relative edge makes it shake up and down, allows powder to streak the object plane for being suspected to have impression of the hand, you can to show impression of the hand；Excessive powder is withdrawn and is held Device, then gently the powder floated in small ditch dug with a plow is shaked off at the attack object back side；This method is suitable for the permeability such as paper, true qualities wood Or semipermeability object.
- 4. according to the finger mark process for show described in claim 1, it is characterised in that：The aobvious method of suspension spray：Including following Step：S1, suspension preparation：First the neopelex of 0.5g is dissolved in 50 mL deionized waters, is stirred to surface After activating agent neopelex is completely dissolved, copper/chromium composite black nanometer powder CuCr of 5 g is added2O4With 50 ML deionized waters, stirring is until powder is uniformly dispersed, is not stratified；S2, spray are aobvious：With the spray bottle equipped with suspension to carry out spray at blood latent fingerprint 20cm aobvious, solution is set fully to be connect with sample Touch, observed again after slowly being rinsed with clear water after 30s and show effect, the repetitive operation if ineffective, until showing preferable effect Sample is dried up with hair dryer after fruit.
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| CN108102427B (en) * | 2017-12-29 | 2020-10-09 | 华南协同创新研究院 | Submicron cobalt-containing black ceramic pigment and preparation method and application thereof |
| CN108059187B (en) * | 2017-12-29 | 2020-03-24 | 华南协同创新研究院 | Low hexavalent chromium separated copper-chromium black pigment and preparation method and application thereof |
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