56results about How to "Obvious reunion phenomenon" patented technology

The invention belongs to the technical field of macromolecular polymer based composite materials, particularly relates to a carbon nano tube (CNT)/polylactic acid (PLA) composite material and a preparation method thereof. The method is characterized in that a plasticizer is added in the traditional melt blending process, therefore, the affinity of carbon nano tubes with a PLA matrix can be improved and a CNT percolation network can be formed in the PLA. The preparation process is very simple and the preparation cost is lower. The molecular motion of the PLA is limited to a certain extent by the formation of the percolation network, therefore, the composite material shows an approximately solid elastic behavior; and the carbon nano tubes can disperse in the PLA matrix very well, therefore, a solid foundation is laid for improving the properties of the PLA.

The invention relates to the technical field of material preparation and electroanalytical chemistry, and concretely relates to a CoFe2O4NWs/RGO composite nano-material, and a paracetamol electrochemical sensor obtained through the composite nano-material. The composite nano-material is prepared through the following steps: S11, carrying out ultrasonic treatment on graphene oxide (GO) in water for 10-30 min, adding citric acid, and continuously carrying out ultrasonic treatment for 10-60 min to obtain a GO dispersion; S12, adding FeCl3.6H2O and CoCl2.6H2O to the GO dispersion, and carrying out ultrasonic treatment for 10-60 min; S13, adjusting the pH value of the above obtained dispersion to 9.5-10.5, adding hydrazine, stirring the dispersion and hydrazine for 30-120 min, and ageing the obtained mixture for 18-48 h; and S14, centrifuging the aged mixture, washing the centrifuged mixture, and drying the washed mixture to obtain the CoFe2O4NWs/RGO composite nano-material. An electrochemical electrode or the electrochemical sensor obtained through the composite nano-material has the advantages of good stability, low detection limit, high sensitivity and high selectivity in the paracetamol detection process.

The invention discloses a method for preparing a water-soluble ferroferric oxide nano particle, relates to a nano particle, and provides the ferroferric oxide nano particle which has the grain diameter of less than 4 nm and narrow particle diameter distribution. The method for preparing the water-soluble ferroferric oxide nano particle of a typical monodisperse particle is provided. The method comprises the steps as follows: 1), anhydrous ferric chloride and trisodium citrate are immersed in diethylene glycol and heated until the anhydrous ferric chloride and the trisodium citrate are dissolved completely; 2), anhydrous sodium acetate is added into a mixed solution obtained in the step 1), and the mixed solution is waited to be dissolved completely; 3), the mixed solution obtained in the step 2) is placed into a reaction still, the reaction still is closed, and after the reaction, the mixed solution is naturally cooled to the room temperature; and 4), the ferroferric oxide nano particle is separated from the reaction solution prepared in the step 3) by a magnet, the particle is washed and dried, so that the monodisperse water-soluble ferroferric oxide nano particle is obtained.

The invention discloses a preparation method of a porphyrin coupled silicon dioxide organic-inorganic nonlinear optical material, which comprises the following steps: 1. heating and reflowing a mixed solution of Msco-tetra-(4-carbomethoxyphenyl) porphyrin copper and gamma-aminopropyltriethoxysilane at the temperature of 160 to 250 DEG C for 10 to 60 hours to obtain a transparent deep red liquid; 2. dissolving a reaction product of step 1 and metal alkoxide into anhydrous ethanol, and stirring at room temperature for 1 to 2 hours; 3. dropwise adding a (H2O)/(C2H5OH) mixed liquid into the reaction product of step 2 at the room temperature for hydrolysis and polymerization reaction for 1 to 5 hours; and 4. pouring the obtained transparent sol into a glass or plastic utensil, sealing with a thin film, ageing at the room temperature for 35 to 45 days, and pricking a hole on the thin film every day to finally prepare compound dried gel. The invention has the advantages that the monomer doping concentration of porphyrin molecules in a gel solid medium can be greatly improved, and the molecular energy level structure and the spectral characteristic of the porphyrin molecules in the gel medium are kept.

The invention discloses a nanometer platinum-copper alloy catalytic material for electrolysis of water. The nanometer platinum-copper alloy catalytic material for electrolysis of water is prepared by using electrospinning technique and chemical vapor deposition; platinum-copper alloy nanoparticles are uniformly dispersed on carbon nanofibers, and the nanoparticles are free of obvious agglomeration, small in particle size and uniform in distribution and have a great number of active sites, thereby improving the catalytic activity of the material; and a preparation method for the nanometer platinum-copper alloy catalytic material is simple in process flow, free of production of toxic substances, friendly to environment, free of pollution and good in repeatability, and has good industrial application prospect.

The invention relates to a compound adsorbent based on hippophae rhamnoides linn branches and trunks. The compound adsorbent is produced by the following steps: preparing hippophae rhamnoides linn charcoal by the hippophae rhamnoides linn branches and trunks, and loading nano Fe3O4 grains. The invention further provides a preparation method of the compound adsorbent. The national resource quantity of the hippophae rhamnoides linn branches and trunks is great; and the compound adsorbent is prepared by taking waste biological resources of the hippophae rhamnoides linn branches and trunks as raw materials so that the industrial chain of utilizing the hippophae rhamnoides linn branches and trunks is effectively lengthened. The obtained compound adsorbent can be used for treating doxycycline organic pollutant wastewater and can be regenerated.

The invention provides a preparation method of carbon-calcium aluminate composite powder. By the method, aluminium oxide is adopted as raw material, and organic acid calcium is adopted as raw material, in non-oxidizing atmosphere, carbon-calcium aluminate composite powder is obtained by high temperature sintering. The organic acid calcium has two effects, organic acid acts as a calcium source and a carbon source, by taking advantage of this characteristic, in high temperature non-oxidizing atmosphere, sintering is conducted on organic acid calcium and aluminum oxide, pyrolysis is conducted on organic acid calcium, carbon is reduced, new generated calcium oxide and aluminium oxide in the raw materials react to form a calcium aluminate, carbon/calcium aluminium powder is synthesized in one step by utilizing this characteristic. The method has the characteristic of in-situ synthesis, and carbon source is added by means of chemical reactions, carbon source after the chemical reactions gets into composite materials, the dispersity of carbon is greatly increased, far superior to the dispersity of the carbon added by means of physical penetration in the prior art.

The invention discloses a terpenyl ester hyperdispersant and a preparation method for the same. The preparation method comprises the following steps of feeding 100 parts by weight of terpene resin, 25 to 50 parts by weight of an alpha,beta-unsaturated compound and 0.1 to 1.5 parts by weight of a catalyst into a reaction kettle, slowly raising the temperature to 160 to 200 DEG C under the protection of nitrogen, performing reaction with stirring for 4 to 6h, adding 1 to 50 parts by weight of a modified carboxylation reagent and 20 to 60 parts by weight of dihydric alcohol, continuing performing reaction for 3 to 4h, then gradually raising the temperature to 220 to 260 DEG C, performing condensation polymerization reaction for 8 to 10h under the vacuum condition of 500 to 2,000Pa, and cooling to obtain the terpenyl ester hyperdispersant after reaction is finished. The hyperdispersant can be widely applied to the preparation and the dispersion of inorganic superfine powder.

The invention belongs to the field of functional material, and discloses a preparation method of a high-dispersity silk fibroin-chitosan-3-methylimidazole salt hexylthiophene-multiwalled carbon nanotube gel. According to the preparation method, the pi-pi bond effect not covalent bond effect of conjugate polyelectrolyte 3-methylimidazole salt hexylthiophene with acidified carbon nanotube surfaces is taken into utilization, so that the mutual attractive force of the modified carbon nanotube is reduced, the adhesiveness of the modified carbon nanotube is reduce, the dispersity is improved, the prepared material is high in stability and hydrophilic performance in solution, preparation speed is accelerated greatly, preparation cost is reduced, no influence on subsequent experiment steps or theperformance of particles to be prepared is caused, experiment result scientific performance is not influenced, experiment operation is simple, nontoxic, and harmless, and the preparation method is green, and is friendly to the environment.

The invention provides a flame-retardant high-polymer composite material. The material is characterized by being prepared from an environment-friendly brominated flame retardant, graphene nano-platelets and an auxiliary dispersant, wherein the high-polymer material is polystyrene. The graphene nano-platelets are creatively added into the flame-retardant material and the adding mount is accurately limited; the graphene nano-platelets belong to condensed-phase flame retarding and a network structure is mainly formed in a combustion process, so that the material represents a solid-like behavior in a combustion process; the network structure can effectively inhibit thermal motion of a polymer molecular chain and the exchange of gas and heat is stopped. In view of the flame-retardant effect, only a few of graphene nano-platelets are added and the heat releasing speed and the smoke density of a polymer can be remarkably reduced; unpredicted technical effects are realized.

The invention relates to a mixed initiating system for increasing the stability of gelatin casting molding ceramic slurry and a use method thereof. The mixed initiating system comprises four components: in particular, deionized water, common used initiating agent, common used monomer and organic amine. The conventional gelatin casting molding technique can prepare stable ceramic slurry with about50-60 vol% of solid content and 300-600mPa.s of viscosity. The gelatin casting biscuit with uniform and compact structure can be obtained by further curing the ceramic slurry. The mixed initiating system can obtain the slurry with good stability, can prepare oxide and non-oxide ceramic materials with low cost, high performance and complex shape, and is suitable for the preparation of blocks or porous ceramics. And the technical process thereof can be easily realized.

The invention discloses an electrolytic water catalytic material of a gold-copper twin structure. The electrolytic water catalytic material is a nano-particle/carbon nanofiber hybrid material of the gold-copper twin structure. According to the electrolytic water catalytic material, the size of the gold-copper twin structure nanometer material is uniform, no obvious agglomeration phenomenon exists, a large number of nanometer interfaces of the electrolytic water catalytic material can effectively improve the catalytic activity, and good stability and repeatability are achieved.

The invention provides a preparation method of a catalyst for catalyzing hydrolysis of ammonia borane. The preparation method comprises the following steps: cleaning a foam material taking metal and/or alloy as a framework; placing the cleaned foam material in air or oxygen to be subjected to oxidation treatment; mixing the foam material subjected to oxidation treatment and a precursor of phosphine gas according to a preset mass ratio to form a mixture, and calcining the mixture at a first preset temperature under the protection of inert gas so as to perform phosphating treatment on the foam material subjected to oxidation treatment; and washing the phosphatized foam material, and drying at a second preset temperature to obtain the foam catalyst with the nanorods on the surface. The preparation method is simple to operate, low in cost and easy for mass production, the nanorod prepared by the method has very good catalytic activity, 65mL of H2 can be generated per minute by only needing1cm < 2 > of Ni3Fe7P nanorod foam, and the nanorod has ultrahigh stability.

The invention provides a silver-loaded nano cellulose, a preparation method thereof and an antibacterial composite material, and belongs to the technical field of functional materials. The preparationmethod comprises the following steps: mixing nano lignocellulose, tetramethyl piperidine oxide, NaBr and a Na2CO3-NaHCO3 buffer solution to obtain a nano lignocellulose suspension; mixing the nano lignocellulose suspension with a NaClO water solution, carrying out an oxidation reaction to obtain carboxylated nano lignocellulose; and mixing carboxylated nano lignocellulose, AgNO3, NaBH4 and water,and carrying out a reduction reaction under a dark condition to obtain the silver-loaded nano cellulose. By adopting the provided method, silver nano particles can be uniformly dispersed on the surface of the nano cellulose, the problem that silver nano particles are easy to agglomerate is solved; the silver-loaded nano cellulose is doped into a base material, and thus the obtained antibacterialcomposite material has an excellent antibacterial performance and also has excellent water resistance and mechanical properties.

The invention discloses rare earth-doped NaLaMgTeO6-based green fluorescent powder and a preparation method thereof. By adopting a high-temperature solid phase method, by taking a compound containing Na<+>, a compound containing La<3+>, a compound containing Te<4+>, a compound containing Mg<2+>, a compound containing Dy<3+> and a compound containing Tb<3+> as reaction raw materials, the raw materials are weighed in a stoichiometric ratio of a chemical formula NaLa(1-x)MgTeO6:xTb<3+>, wherein x is equal to 0.01-0.10. The NaLa(1-x)MgTeO6:xTb<3+> crystal prepared by the invention is good in development and good in powder morphology. The crystal excited by 365nm ultraviolet rays emits green characteristic light, is high in light emitting intensity and emits light in a wide spectrum and multiple peaks. The emission peak covers red, green and blue wide areas of 485-625nm and green emission at the main peak of 547nm is represented.

The invention discloses W-Cu composite powder with high thermal conductivity and low thermal expansion coefficient. The thermal conductivity is 200-235W/(m.K), and the thermal expansion coefficient is (5.6-9.3) * 10<-6>/K. The invention further discloses a preparation method of the W-Cu composite powder with high thermal conductivity and low thermal expansion coefficient. The preparation method comprises the following steps of: preparing a W-Cu precursor by adopting a wet chemical method; carrying out pyrolysis reduction on the W-Cu precursor in a hydrogen environment; and carrying out compression molding on the reduced W-Cu composite powder, then heating to 1100-1300 DEG C in a hydrogen atmosphere, carrying out heat preservation for 100-140 minutes, and cooling to obtain the W-Cu composite powder. According to the preparation method, the W-Cu composite precursor is prepared by adopting the wet chemical method, the W-Cu composite powder with high sintering activity is obtained through different reduction process combinations, and then the W-Cu composite powder with high density, high thermal conductivity, low thermal expansion coefficient and uniform tissue distribution is prepared through subsequent liquid phase sintering.

The invention provides a lithium iron phosphate anode active material and a preparation method thereof. The preparation method of the lithium iron phosphate anode active material comprises the following steps: allowing a first phosphorus source, a first iron source and a cationic surfactant to contact with a first lithium source to obtain a solution A, allowing a second phosphorus source, a second iron source and an anionic surfactant to contact with a second lithium source to obtain a solution B, and reacting the solution A with the solution B at a high temperature under a high pressure to obtain lithium iron phosphate. The method is simple and can be easily realized, and the prepared anode active material has the advantages of high compacted density, high specific capacity and high volume energy.

The invention discloses a preparation method of a CNT/PDMS flexible composite material, which comprises the following steps: fully mixing CNT modified by a strong acid oxidation method with sugar particles, adding PDMS sponge and a curing agent, fully stirring, tabletting by using a tabletting machine, putting a sample into a drying oven, heating and curing for a certain time, and taking out the sample to obtain the CNT/PDMS flexible composite material. And taking out the sample, and putting the sample into water to melt the sugar, thereby preparing the CNT/PDMS flexible composite material. The carbon nanotubes are brought into the PDMS matrix through the sugar particles, so that the phenomenon of agglomeration among the nanotubes is reduced, the carbon nanotube particles are favorably combined with the polymer matrix and are uniformly dispersed in the flexible matrix PDMS, the sensitivity and durability are good, and stable capacitance response is ensured.