46 results about "Particle stability" patented technology

The present invention discloses a preparation method of nylon micro powder for selective laser sintering, the method is as follows: in the manner of dissolution-precipitation, first a dispersant is introduced into a polymer good solvent system, a poor solvent is added for precipitating of a polymer, and by use of the interaction of the dispersant and polymer chains in the system and particle stability protective effect, well dispersed polymer microspheres can be obtained. A used solvent and the used dispersant both can be recycled, compared with the prior art, no high-temperature high-pressure equipment is used, the process is simple, and the preparation method is cost-effective, environmentally-friendly and easy to implement. According to the method, the nylon powder for selective laser sintering with excellent physical and chemical properties can be obtained, the nylon powder has good particle shape and liquidity, larger sintering window, and better heat resistance and thermal stability, and can meet the needs of SLS parts in the aerospace, automotive, medical equipment, electronic equipment, machinery mold, art work and other fields.

The invention discloses a titanium silicon nitride core-spun yarn which comprises a core layer and a steel sheet layer wrapped outside the core layer, wherein the core layer is a titanium silicon nitride alloy layer; a network support layer prepared from steel or iron is arranged between the core layer and steel sheet layer; and the titanium silicon nitride alloy layer is composed of titanium silicon nitride alloy particles with the particle size of less than 3mm. The Ti and the carbon or nitrogen in the steel form nano-size compounds which have favorable refinement effect on the structure, thereby enhancing the strength of the ferrous material, enhancing the TiN particle stability by nitridation and effectively preventing the austenite grains from growth. The titanium silicon nitride core-spun yarn sufficiently utilizes the cheap nitrogen element, and can save the titanium addition amount on the premise of ensuring certain strength level, thereby further lowering the cost of the non-quenched and tempered steel.

A composite nano conductive material of carbon film and LiFePO4 is xC:yLiFePO4, where the value of x is 0.01-0.30 and the value of y is 0.70-0.99. It is prepared by first mixing polylol or sugar as conductive presoma material with raw material of lithium source, iron source and phosphorus source for synthesizing LiFePo4 in water uniformly and then followed with drying and baking.

The invention discloses liquid metal nanoparticles and a preparation method thereof. The preparation method comprises the following steps of providing liquid metal and a dopamine solution; adding theliquid metal into the dopamine solution and treating the liquid metal into a nano-liquid-droplet system; and adjusting the pH value of the system to be alkaline so as to enable dopamine to be subjected to self-polymerization reaction to obtain the liquid metal nanoparticles. According to the preparation method of the liquid metal nanoparticles, the problem of poor stability of existing liquid metal nanoparticles is solved.

The invention discloses a Cr-doped nano near infrared long-persistence material. A base material is Zn(2-x)Al2xSn(1-x)O4, wherein x is more than or equal to 0 and less than or equal to 1, the doped ion Cr<3+> is an active ion, and the doping amount of the Cr<3+> is 0.01-0.05mol%. The invention also discloses a method for preparing the Cr-doped nano near infrared long-persistence material. The nano near infrared long-persistence material prepared by the invention has the particle size being less than 100nm and is high in monodispersity and excellent in uniformity, the particles are not aggregated after being sintered at a high temperature of over 1000 DEG C, the stability of the particles is high, the persistence time is more than 150 hours, and the Cr-doped nano near infrared long-persistence material can be well applied to the field of bioimaging and is low in cost.

The invention discloses an anti-caking water-retaining compound fertilizer and a preparation method thereof. The anti-caking water-retaining compound fertilizer comprises, by weight parts, 20-22 parts of urea, 10-12 parts of expanded perlite, 3-5 parts of EM fungicide, 20-25 parts of weathered coal, 13-15 parts of sodium humic acid, 12-14 parts of monopotassium phosphate, 10-11 parts of chitosan, 2-3 parts of polyacrylamide, 2-3 parts of ferric ammonium citrate, 5-8 parts of magnesium sulfate, 4-6 parts of activated carbon, 6-8 parts of Chinese herb residues, 8-10 parts of plant ash, 6-8 parts of pine needle mulch, 6-9 parts of polylactic acid, 8-12 parts of polyvinyl alcohol, 0.5-1 part of N,N-methylene-bisacrylamide and an appropriate amount of water. According to the anti-caking water-retaining compound fertilizer, the functional components including the plant ash, the pine needle mulch, the weathered coal and the activated carbon are added, fertilizer particle pores are added, and the particle stability is improved, so that the anti-caking effect of the fertilizer is good; mutual adhesion and caking between fertilizer particles can be avoided during use, and thus the fertilizer efficiency is guaranteed.

The invention discloses a preparation method of a conductive inductive ink. The preparation method comprises following steps: (1) taking graphene oxide (GO) as a hard template, carrying out in-situ polymerization with EDOT on the surface of GO to obtain a poly(3,4-ethylenedioxythiophene): graphene (PEDOT: rGO) composite material, and then reacting the composite material with polyethyleneimine (PEI) and gold nano particles (Au NPs) to obtain PEDOT: rGO-PEI/Au NPs aqueous dispersion; and (2) preparing a PEDOT: rGO-PEI/Au NPs ink, spraying the ink on the surface of an hydrophilic modified PET substrate in an ink jet printing mode to form a specific pattern, and carrying out assembly to obtain a PET based PEDOT: rGO-PEI/Au NPs sensor device, which can be used to detect humidity and gas. PEDOT:rGO is modified by an amino containing hydrophilic polymer such as PEI, and the water dispersion property and gold nano particle stability of PEDOT: rGO are further enhanced. A sensor prepared by theprovided composite ink has the advantages of high light transmittance, good stability, and wide humidity response range.

The invention discloses a method for preparing anionic fluorine-containing polyacrylate soap-free emulsion. The method comprises the steps that acrylic monomers and fluorinated acrylate monomers are mixed to obtain mixed monomers, and an initiator and deionized water are mixed to obtain an initiator water solution; the initiator water solution, alkali, deionized water and an emulgator are weighed according to the mass of the mixed monomers, and the emulgator is fluorine-containing amphiphilic block copolymer poly(crylic acid-co-polyethylene glycol monomethyl ether methyl acrylate)-b-polyacrylic acid hexa-fluorin butyl ester; the mixed monomers and the initiator water solution are equally divided into three parts respectively; alkali, the deionized water, the emulgator, one part of mixed monomers and one part of initiator water solution are added into a four-mouth flask together; argon is introduced into the four-mouth flash, heating is carried out, the remaining mixed monomers and initiator water solution are added in the heating process, and the anionic fluorine-containing polyacrylate soap-free emulsion is obtained through cold water discharging. The anionic fluorine-containing polyacrylate soap-free emulsion with good emulsion particle stability can be prepared through the preparation method.

The invention discloses a kit for measuring apolipoprotein C3. The kit comprises a reagent R1, a reagent R2 and a calibrator. The R1 comprises a buffer solution, an electrolyte, a surfactant, a reaction enhancer, a stabilizer, and a preservative. The R2 comprises a buffer solution, sheep anti-human apolipoprotein C3 antibody latex particles, an electrolyte, a surfactant, a stabilizer, and a preservative. The calibrator comprises a buffer solution, recombinant apolipoprotein C3, bovine serum albumin, mannitol, and sodium azide. The apolipoprotein C3 kit is a liquid double-reagent, reconstitution preparation is not required, and therefore the reagents can be directly used when taken out from a bottle. Stability of the obtained latex particles is high. Accuracy of detecting result is greatlyimproved. The sugar residues of the Fc end of the apolipoprotein C3 antibody are oxidized to aldehyde by sodium periodate. The binding rate and stability of the antibody are improved. The active region of antibody binding to antigen is effectively protected. Sensitivity and stability of the detecting reagents are improved.

The invention discloses a hydrogel-hydrophobic Janus particle and a preparation method thereof. In the method, a toxic-free solvent and a bio-compatible material are used for preparing the hydrogel-hydrophobic Janus particle. The method includes the steps of: dissolving the hydrogel biomaterial and the hydrophobic biomaterial in water, and generating mono-dispersed emulsion with a flow-focusing micro-fluidic device; changing external conditions to separate a hydrophobic organic high-molecular phase out and form a hydrophobic semi-sphere around drops; adding an ionic substance, which can be crosslinked with the hydrogel material, so that the hydrogel phase is crosslinked with the ionic substance to form hydrogel semi-sphere, and finally, the two organic high-molecular phases are subjected to molecule winding during phase separation so as to form an integrated structure, thus obtaining the hydrogel-hydrophobic Janus particle. The particle has high stability and is controllable in size. As a surfactant, the particle can solve the problem such as instability of a micro-emulsion and the like.

Provided are: a sintering binder including nanoparticles, a method for producing the sintering binder, and a method for bonding using the sintering binder. The sintering binder mainly includes cuprous oxide nanoparticles, combines particle stability with bondability, and less undergoes ion migration. A composite particle including metallic copper with the remainder being cuprous oxide and inevitable impurities is used for bonding typically of metals. The composite particle structurally includes metallic copper dispersed inside the particle and has an average particle size of 1000 nm or less.

The invention provides a preparation method of granular anhydrous calcium hydrogen phosphate. The method comprises the following steps: by taking calcium carbonate or calcium hydroxide as a calcium source, reacting with phosphoric acid; adding magnesium oxide as a crystal seed accelerant to prepare calcium hydrogen phosphate; after reacting, carrying out solid-liquid separation on a product; drying and removing crystalized water to prepare the anhydrous calcium hydrogen phosphate; after preparing the anhydrous calcium hydrogen phosphate, spraying a pH regulator and adjusting the pH value of the product; and drying through an air flow to prepare the neutral granular anhydrous calcium hydrogen phosphate. According to the preparation method, magnesium oxide is used as the crystal seed accelerant and a stabilizer, and primary drying is carried out, so as to keep the stability of product granules of calcium hydrogen phosphate and the stability of the pH value of a solution. Furthermore, the pH regulator is added and secondary drying is carried out, so as to further maintain the granule stability of the calcium hydrogen phosphate product; and powder is reduced and the neutral granular product is obtained.

The embodiment of the invention provides sensitively responsive polymer nano-particles which comprise poly(cystamine bisacrylamide-alt-spermine) and polyethylene glycol-b-polylysine(2,3-dimethyl maleate); in poly(cystamine bisacrylamide-alt-spermine), a cystamine bisacrylamide monomer and a spermine monomer are connected through a carbon-nitrogen bond; in polyethylene glycol-b-polylysine(2,3-dimethyl maleate), a polyethylene glycol chain segment is methyl-polyethylene glycol-amino; one end of a polylysine chain segment is connected with the amino end of the polyethylene glycol chain segment through an amide bond; and 2,3-dimethyl maleate is connected with amino on the side chain of the polylysine chain segment through an amide bond. The sensitively responsive polymer nano-particles are good in stability and can be effectively enriched at a tumor site; loaded medicinal molecules can enter tumor cells easily; in addition, the sensitively responsive polymer nano-particles are good in biocompatibility and easy to degrade.

The invention discloses a composite used for selenium fertilizer processing and a preparation method and application thereof. The composite comprises the following components by weight percent: 0.1%-0.5% of polyacrylamide, 0.5%-5% of beta-cyclodextrin, 1%-10% of sodium chloride and the balance of water. After the composite used for selenium fertilizer processing is mixed evenly with selenium fertilizer material powder in a ratio of 1:5 and the mixture is granulated, selenium fertilizer particles are formed. The composite can be used as the binder of the selenium fertilizer particles; and the selenium fertilizer particles processed by using the composite have good particle stability and stable particle size.

The invention discloses a laboratory bacterium immobilization method. The method solves the problem that the existing method has a low embedding amount of bacteria, causes poor bacterium immobilized particle stability and utilizes a continuous reaction system difficult to be operated for a long time. The method comprises 1, culturing bacteria to obtain a bacterium liquid, 2, centrifuging the bacterium liquid to obtain immobilized bacteria, 3, dispersing the bacteria through physiological saline, adding a polyvinyl alcohol solution into the dispersion liquid and carrying out mixing to obtain a PVA-bacterium mixed solution, 4, carrying out immobilization through a bacterium immobilization reactor to obtain bacterium immobilized particles, and 5, putting the bacterium immobilized particles into ice water and carrying out standing. The method significantly improves the bacterium embedding amount of the immobilized particles to 15 to 20 g/L, can be well molded, is not broken and does not produce bonding. The immobilized particles have good stability. When the bacterium immobilized particles are used in a continuous fermentation system, the system is stable for at least 2 months. The method is used for bacterium immobilization.

The invention discloses a method for ensuring the volume density of an aluminium electrolysis carbon anode, and relates to an improvement on a method for producing a carbon anode for aluminium electrolysis. The method is characterized in that when raw materials are mixed in the production process of the aluminium electrolysis carbon anode, the volatile component in the mixture is controlled at 9 to 11 percent. The method of the invention achieves the aim of improving the volume density of the anode by controlling the volatile component of petroleum coke, achieves the aim of improving the bulk density and granule stability of the raw materials by effectively controlling the volatile component in the mixed raw materials so as to improve the density of the raw blank, and can reasonably utilize the petroleum coke resources; and the produced carbon anode has the advantages of high volume density index, good quality of the anode, and simple and feasible operation.

The invention discloses a method for preparing core-shell structure nanoparticles on the basis of a coaxial electrostatic spraying shell insertion strategy. According to the method, a hydrophilic polymer is weighed and dissolved in a solvent A, and an obtained solution is taken as a shell solution; a hydrophobic polymer is weighed and dissolved in a solvent B, and an obtained solution is taken asa core solution; the solvent A and the solvent B are mutually soluble solvents; core-shell structure microspheres are prepared by a coaxial electrostatic spraying device; the obtained microspheres areplaced in deionized water and filtered, and the core-shell structure nanoparticles are obtained. The core-shell structure nanoparticles prepared with the method have good stability and have the sizestill not changed after being stored for one week; the core-shell structure nanoparticles with different particle sizes can be prepared with the method through changing of the sample injection speed of the core solution.

The invention discloses an oil product recovering, granulating and drying device for oily sludge. The device mainly comprises a box body; the internal of the box body is divided into an upper layer, amiddle layer and a lower layer; the upper layer is sequentially provided with a demulsification area, a three-phase separation area and an oil storage area from left to right; the middle layer is sequentially provided with a first motor and a filter pressing area from left to right; the lower layer is sequentially provided with a granulating area and a stirring area from left to right; a granulearea and a second motor are further arranged below the granulating area; and a sewage area is arranged below the oil storage area. The device has the advantages of simple structural design, low granulation cost, high automation degree, good granule stability, high oil product recovery rate, and realization of the purposes of reduction, stabilization, harmlessness and recycling of the oily sludge.

An azithromycin capsule and a preparation method thereof are disclosed. The azithromycin capsule comprises a capsule filling material and a capsule shell, the capsule filling material comprises the following raw materials in parts by mass: 245 to 255 parts of azithromycin dihydrate (in terms of afatinib), 45 to 50 parts of microcrystalline cellulose, 0.6 to 1.0 part of sodium dialkyl sulfate, 12 to 15 parts of polyvinylpolypyrrolidone and 5 to 6 parts of magnesium stearate. Podwer material is directly prepared into granules by use of crystal water in the material, the azithromycin capsule canbe continuously produced, the azithromycin capsule has the advantages of uniform compression distribution, good granule stability, good fluidity, less over crushing, higher yield and the like, and isconvenient in mass production.

The invention relates to the field of wave-absorbing material preparation, in particular to a silicon-containing wave-absorbing material preparation method. The method includes: adding, by mass, 1-4 parts of metallic chloride, 12-24 parts of ferric chloride, 4-8 parts of ferrous chloride and solid powder into 100-150 parts of water, and adopting a gel method to prepare metallic oxide magnetic powder under the protection of nitrogen; adding 100-180 parts of ethyl alcohol into a reaction kettle, heating to 40-45 DEG C, sequentially adding 30-50 parts of water, 40-60 parts of ammonium hydroxide and 10-20 parts of ammonium hydroxide under the condition of mechanical stirring, adding metallic oxide magnetic powder dispersion liquid after reaction for 10-15min under the condition of stirring, and performing reaction to obtain a silicon-containing wave-absorbing material. The wave-absorbing material with a silicon dioxide shell layer is capable of resisting solvent and environmental erosion,particle stability is improved, anisotropism can be effectively improved, and dielectric loss is increased.

The invention discloses a preparation method of a bactericide capable of purifying water. The preparation method comprises the following steps: preparing a Chinese herbal preparation from raw Chineseherbs by microwave extraction, alcohol precipitation and decolorization, mixing with dibromohydantoin, dried alum, sulfur suspension and bamboo vinegar uniformly, adding a binder, stirring uniformly,then granulating and drying to obtain the bactericide, wherein the binder contains bentonite, sodium paraben and D-mannose. The preparation method of the bactericide capable of purifying water is simple, easy, readily available in raw materials, high in yield and raw material utilization, high in production efficiency, fast in granulation and low in production energy consumption; and the preparedbactericide has broad-spectrum bactericidal and bacteriostatic activity and good granule stability, and can quickly achieve the purposes of sterilization, water purification and water fertilization.