CN101457034B - Method for preparing high dispersion nano solid powder - Google Patents
Method for preparing high dispersion nano solid powder Download PDFInfo
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- CN101457034B CN101457034B CN2007101790657A CN200710179065A CN101457034B CN 101457034 B CN101457034 B CN 101457034B CN 2007101790657 A CN2007101790657 A CN 2007101790657A CN 200710179065 A CN200710179065 A CN 200710179065A CN 101457034 B CN101457034 B CN 101457034B
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Abstract
The present invention provides a method of preparing a highly dispersed nanometer solid powder body and includes the following steps: nano-particles prepared in liquid states are mixed with microorganisms and are absorbed on the microorganisms in the liquid environment which is suitable for the growth of the microorganisms; then, the microorganisms and the liquid are separated and dried, and the remains of the dried microorganisms are still absorbed by large numbers of nano-particles, and the nano-particles are mutually separated because of the supporting role of the remains of the microorganisms, and no agglomeration is produced between the nano-particles and then solid nano-particles with good dispersity are prepared. The invention has the advantages that the microorganisms are conventional; the microorganisms and the nano-particles are absorbed in liquid states, which easily causes the nano-particles to be in a good disperse state and the single particle of the nano-particles is easily absorbed by the microorganisms; the remains of the microorganisms are adopted as supporting materials between the nano-particles to solve the problem of agglomeration; the supporting materials of the remains of the microorganisms are changed into carbon dioxide with a heating method to avoid the influence on the application of the nano-particles. The method is easy for industrial realization and the operation is easy without environmental pollution.
Description
Technical field
The present invention relates to a kind of novel method for preparing high dispersion nano solid powder.Particularly a kind of characterization of adsorption that utilizes between microorganism and the nano particle prepares the method for high dispersion nano solid powder
Background technology
Powder particularly nano-powder has obtained application more and more widely in the industry-by-industry of national economy, along with the expansion of powder range of application, more and more higher to the requirement of powder.Powder granule is thin more, and its range of application is wide more, and it is excellent more to be applied in the product its performance of back.But because when the granularity of powder attenuates after, the specific surface area of individual particle increases, and very easily produces reunion, the particularly nano particle for preparing nano particle after particle is dried between particle and the particle and reunite again and be micron particles under liquid state.Is nano-scale particle as nano-calcium carbonate at the calcium carbonate granule under the liquid state, but after being dried, lime carbonate just becomes the micron particles about 7 microns.In the process of using, lost the special property that nano particle had.Therefore, need good means and method and make nano particle under solid-state state, keep dispersion state, just can make prepared nano particle give full play to its nano-meter characteristic.At present, applying nano dispersive method has a variety of, as adding dispersion agent (solid or liquid), electrostatic dispersion method, air-flow dispersing method, mechanical dispersion process etc.But there is not a kind of method can fundamentally solve the agglomeration traits of nano particle.This is because when grain graininess during at Nano grade, because granularity attenuates, surface energy increases, when meeting, the particle of high surface energy always to release energy, reduce surface energy, make particle be in steady state, reduce the best method that surface-area is the reduction surface energy and reunite mutually between particle, this process is a spontaneous process theoretically.Therefore, nano particle always is tending towards aggregating state theoretically.Must fundamentally make can not contact between the particle just to make nano particle not produce reunion.Present method adopts microorganism as support nano particle spatially to be isolated exactly, prevents nanoparticle agglomerates, reaches the method for nanoparticulate dispersed.
Summary of the invention
The objective of the invention is the particle agglomeration that exists in the present solid particulate preparation process, influence nano particle and bring into play the problem of its nano-meter characteristic, provide a kind of nano particle that makes that reunion between nano particle and the nano particle can not take place in the exsiccant process, reach the purpose of the nano-powder of preparation favorable dispersity.
To achieve the above object of the invention, the present invention is by the following technical solutions: this method for preparing high dispersion nano solid powder is: the nano particle for preparing under liquid state mixes with microorganism, nano particle is adsorbed on the microorganism, subsequently, with microorganism and liquid separation and carry out drying, still adsorbing a large amount of nano particles on the dried microorganism remains, these nano particles are owing to the supporting role of microorganism remains is separated from each other, can output between the nano particle reunite, thereby prepare the solid nano particle of favorable dispersity.
By adopting microorganism absorption nano particle, with the remains of microorganism as the upholder between nano particle, make nano particle that reunion between nano particle and the nano particle can not take place in the exsiccant process, reach the purpose of the nano-powder of preparation favorable dispersity.
Because microorganism itself has other material of absorption to the attraction of nano particle and the fine hair on microorganism surface; the character of nano-powder particularly; nano particle can be adsorbed in the surface of microorganism; after having adsorbed the nano particle of q.s; microorganism is separated with liquid; at this moment microorganism is dead behind the environment that breaks away from growth, also inhales attached to the nano particle that adsorbs in the liquid on the microorganism remains after the death.Because microorganism is a racemosus, the organism of the subsidiary various fine hair in surface, be adsorbed in nano particle on surperficial top of villi and each branch because the supporting role of microorganism remains, can not reunite together mutually between nano particle and the nano particle, reach the purpose that makes nanoparticulate dispersed owing to the intensive magnetism between the nano particle.
As long as temperature is high slightly, the microorganism remains will be broken down into carbonic acid gas and discharge, and can not influence the effect of nano particle in matrix material.
The handled powder granularity of the present invention should be less than 100 nanometers, because just can demonstrate its distinctive nano-meter characteristic when nano particle has only particle diameter less than 100 nanometers.
Microorganism used in the present invention comprises that all can adsorb the microorganism of nano particle, can be bacterium, virus etc.
Advantage of the present invention: the used microorganism of (1) the present invention is conventional microorganism, obtains easily; Make nano particle be in good dispersion state easily when (2) microorganism and nano particle adsorb under the employing liquid state, be easy to the single particle absorption of microorganism nano particle; (3) remains of method employing microorganism of the present invention make nano particle fundamentally solve the problem of reuniting each other as the upholder between the nano particle.(4) the prepared high-dispersion nano particle of method of the present invention is easy to make the microorganism remains upholder between nano particle become the influence that carbonic acid gas avoids the microorganism remains that nano particle is used by the method for heating in application process in the future.(5) method of present method is easy to industrial realization, and processing ease can not produce pollution to environment.
Description of drawings
The different types of microorganism absorption of Fig. 1 nano particle synoptic diagram
The form of microorganism is varied; The structure of microorganism itself has the racemosus shape as can be seen from Figure 1, and the surface a lot of fine hair is arranged, when these fine hair run into the surface that nano particle is adsorbed on nano particle microorganism.
Embodiment
Embodiment 1:M13 virus is to the absorption of nm gold particles
1, adopts the plate streaking isolation technique of microorganism to isolate M13 (enterobacteria phage E nterobacteriaphage), or choose bacterial classification oneself and cultivate;
2, adopting organic carbon source is under the condition of 4.0-6.0 in the pH value, maintains the temperature at about 40 degree M13 is cultivated, breeds, and obtains containing a large amount of microbial solutions;
3, buy nm gold particles, the dispersion agent of application surface promoting agent class (as titanic acid ester etc.) disperse, the solution of the nano particle of favorable dispersity obtained; Also can adopt chemical process directly to prepare nanoparticles solution;
4, dispersive nano particle under the liquid state is joined screened in the acclimated microorganism growth media in the growth media concentration of nano particle less than 20%, the residence time is 12 hours, make the be adsorbed as monolayer adsorption of nano particle, will adsorb the microorganism and the liquid separation of nano particle on the microorganism surface;
5, the drying that will adsorb the microorganism of nano particle is prepared into the nano solid powder of polymolecularity.
Embodiment 2
1, seed selection thiobacillus is cultivated (acidic solution, temperature are under 30-70 degree, the oligotrophic condition (carbon source is less than 10mg/l in the aqueous solution)) to bacterium under the environment that is fit to bacterial growth;
2, pyrite and dispersion agent (Sodium hexametaphosphate 99) are put into efficient agitator mill grinding 5 hours, obtain pyritous nano-dispersed solution;
3, dispersive nano particle under the liquid state is joined in the sulfuration bacteria growing liquid that is screened;
4, the absorption that reaches after will separating the sulfuration bacterium drying of nano particle, be prepared into the good nano solid powder of dispersion property.
Claims (10)
1. method for preparing high dispersion nano solid powder, it is characterized in that: it comprises: the nano particle for preparing under liquid state mixes with microorganism, in being suitable for the liquid environment of microorganism growth, make on the nano particle absorption microorganism, subsequently, with microorganism and liquid separation and carry out drying, still adsorbing a large amount of nano particles on the dried microorganism remains, these nano particles are owing to the supporting role of microorganism remains is separated from each other, can output between the nano particle reunite, thereby prepare the solid nano particle of favorable dispersity.
2. method according to claim 1 will be controlled the adsorptive capacity of nano particle well when it is characterized in that microorganism absorption nano particle, make the nano particle on microorganism surface less than monolayer adsorption.
3. method according to claim 1 and 2 is characterized in that: applied microorganism is bacterium or virus.
4. method according to claim 3, it is characterized in that: the method for the acquisition of described bacterium or virus is: adopt plate streak to select specific bacterium or virus or purchase corresponding bacteria bacterial classification, then, in specific nutrition environment, the potential of hydrogen of control substratum is cultivated, is bred under suitable temperature.
5. method according to claim 3 is characterized in that: described virus is harmless M13 virus.
6. method according to claim 3 is characterized in that: described bacterium is for leaching the thiobacillus that copper mine is used.
7. method according to claim 1 and 2 is characterized in that: the preparation method of described nanoparticles solution is: the purchase nano particle makes after it is disperseed with suitable dispersion agent; Perhaps adopt directly synthesis of nano particle in solution of chemical process; Also can adopting efficiently, grinding plant is ground to the nanometer grade with existing solid materials.
8. method according to claim 3 is characterized in that: the preparation method of described nanoparticles solution is: the purchase nano particle makes after it is disperseed with suitable dispersion agent; Perhaps adopt directly synthesis of nano particle in solution of chemical process; Also can adopting efficiently, grinding plant is ground to the nanometer grade with existing solid materials.
9. method according to claim 5, it is characterized in that: the dispersive nano particle is for buying nm gold particles under the described liquid state, the dispersion agent titanic acid ester of application surface promoting agent class is disperseed, dispersive nm gold particles under the liquid state is joined in the M13 viral growth liquid through taming that is screened, the concentration of nano particle is less than 20% in the growth media, the residence time is 12 hours, make nano particle in the microorganism surface adsorption, will adsorb the microorganism and the liquid separation of nano particle; To adsorb the drying of the microorganism of nano particle, be prepared into the nano solid powder of polymolecularity.
10. method according to claim 6 is characterized in that: the thiobacillus of institute's seed selection is to cultivate under the condition of carbon source less than 10mg/l in 30-70 degree, the aqueous solution in acidic solution, temperature; Adopt pyrite and Sodium hexametaphosphate 99 to put into efficient agitator mill and ground 5 hours, obtain pyritous nano-dispersed solution.
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| CN101457034B true CN101457034B (en) | 2011-07-06 |
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| CN102826611A (en) * | 2012-09-13 | 2012-12-19 | 中国科学院成都生物研究所 | Microbiology method for improving aqueous dispersibility of ferric oxide ultrafine powder body |
| CN104377350B (en) * | 2013-08-16 | 2018-05-08 | 苏州宝时得电动工具有限公司 | Electrode composite material and preparation method thereof and the Anode and battery with the electrode composite material |
| CN105861313B (en) * | 2015-01-20 | 2020-01-14 | 中南大学 | Microbial-based driving powder self-assembly particle and assembly and application method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA838632A (en) * | 1970-04-07 | Segal Sidney | Method of producing readily dispersible solid particles and products thereof | |
| KR950003410B1 (en) * | 1991-12-31 | 1995-04-12 | 주식회사 럭키 | Method of preparing solid particles by vesicles |
| JP2002020652A (en) * | 2000-07-13 | 2002-01-23 | Kao Corp | Composite powder |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA838632A (en) * | 1970-04-07 | Segal Sidney | Method of producing readily dispersible solid particles and products thereof | |
| KR950003410B1 (en) * | 1991-12-31 | 1995-04-12 | 주식회사 럭키 | Method of preparing solid particles by vesicles |
| JP2002020652A (en) * | 2000-07-13 | 2002-01-23 | Kao Corp | Composite powder |
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