41 results about "Hydrothermal deposition" patented technology

The present invention relates to directional nanometer zinc oxide stick or linear film and its preparation process, and belongs to the field of low-dimensional nanometer film material technology. The present invention adopts hydrothermal deposition process, in which zinc salt solution in molar concentration 1-25 mM and amine surfactant solution are mixed homogeneously and set inside stainless steel reactor with PTFE lining, substrate of glass, polymer, inorganic metal, non-metal or other material and with directional texture ZnO crystal seed is set inside the lining, so as to react at 50-150 deg.c for 1-6 hr. After cooling naturally, directionally grown and high crystallized ZnO nanometer stick array film or nanometer stick of diameter 10-500 nm may be form. The process has low synthesis temperature and easy control, and the grown ZnO film is well directional. The present invention is suitable for industrial production of directional nanometer ZnO stick or film.

The invention provides a composite photocatalytic material, a preparation method and an application of the composite photocatalytic material. The preparation method comprises: obtaining a precursor of g-C3N4 through high-temperature calcination; preparing a magnetic composite of Fe3O4/g-C3N4 through hydrothermal deposition; and allowing the magnetic composite to react in a solution of silver nitrate through a thermal photodeposition method to obtain the composite photocatalytic material of Ag/Fe3O4/g-C3N4. The composite is high in dispersion and activity, can degrade tetracycline in the environment, and has characteristics of simple synthesis and high degradation rate.

The invention discloses an octanol hydrorefining catalyst, which belongs to the field of hydrorefining catalytic materials. The prepared catalyst is used for modifying a carrier by using a rare earth element, reducing the amount of an active component of a nickel ion entering a carrier framework and improving the content of surface nickel species; the active component is loaded by adopting a hydrothermal deposition method, the dispersion of nickel salts on the surface of a carrier pore canal by using hydrothermal high-temperature and high-pressure conditions and forming nickel precipitation with proper size at the loading initial period of the active component by using a deposition reaction, so the invention can effectively control the amount of the nickel ions entering the carrier, improve the content of the surface nickel species and simultaneously can avoid the growth of nickel oxide particles; and the catalyst greatly increases the surface nickel active site, effectively improves the utilization rate of the active component of nickel and has higher catalytic reaction activity during hydrorefining the octanol at higher airspeed. The result shows that the hydrogenation rate of an unsaturated substance in crude octanol reaches over 90 percent when the temperature is 120DEG c, the pressure is 2.5MPa, the ratio of hydrogen to liquid for feeding is 8:1 and the airspeed is 30<-1>hour.

The invention provides a method for hydrothermal deposition of an iron oxide film through a one-step method by using single-source soluble complex iron salt as a precursor. The firm and compact iron oxide film is obtained through performing hydrothermal deposition onammonium ferric citrate or ammonium ferric oxalate serving as a raw material at a temperature of 90-200 DEG C. The iron oxide film, prepared by adopting the method, can be directly deposited on F-doped tin dioxide electric conducting glass, a surface-treated stainless steel substrate or common glass. The film obtained by being activated in the process that the iron oxide is reduced by ethanol and reoxidized has excellent photoelectric property. The method has the advantages that the concentration of other additives in solution does not need to be adjusted due to the fact that not many reaction precursors are used; the iron oxide film is directly obtained without adopting the process of annealing FeOOH and converting the annealed FeOOH into iron oxide, so that the manufacturing cost is reduced.

A c-axis-oriented HAP thin film synthesized by seeded growth on a palladium hydrogen membrane substrate. An exemplary synthetic process includes electrochemical seeding on the substrate, and secondary and tertiary hydrothermal treatments under conditions that favor growth along c-axes and a-axes in sequence. By adjusting corresponding synthetic conditions, an HAP this film can be grown to a controllable thickness with a dense coverage on the underlying substrate. The thin films have relatively high proton conductivity under hydrogen atmosphere and high temperature conditions. The c-axis oriented films may be integrated into fuel cells for application in the intermediate temperature range of 200-600° C. The electrochemical-hydrothermal deposition technique may be applied to create other oriented crystal materials having optimized properties, useful for separations and catalysis as well as electronic and electrochemical applications, electrochemical membrane reactors, and in chemical sensors.

A c-axis-oriented HAP thin film synthesized by seeded growth on a palladium hydrogen membrane substrate. An exemplary synthetic process includes electrochemical seeding on the substrate, and secondary and tertiary hydrothermal treatments under conditions that favor growth along c-axes and a-axes in sequence. By adjusting corresponding synthetic conditions, an HAP this film can be grown to a controllable thickness with a dense coverage on the underlying substrate. The thin films have relatively high proton conductivity under hydrogen atmosphere and high temperature conditions. The c-axis oriented films may be integrated into fuel cells for application in the intermediate temperature range of 200-600° C. The electrochemical-hydrothermal deposition technique may be applied to create other oriented crystal materials having optimized properties, useful for separations and catalysis as well as electronic and electrochemical applications, electrochemical membrane reactors, and in chemical sensors. Additional high-density and gas-tight HAP film compositions may be deposited using a two-step deposition method that includes an electrochemical deposition method followed by a hydrothermal deposition method. The two-step method uses a single hydrothermal deposition solution composition. The method may be used to deposit HAP films including but not limited to at least doped HAP films, and more particularly including carbonated HAP films. In addition, the high-density and gas-tight HAP films may be used in proton exchange membrane fuel cells.

The invention relates to the synthesis of low-dimensional nanomaterial films, and provides a microwave synthesis method of a zinc oxide film with an oriented nanorod structure. The method is characterized in that a microwave-hydrothermal deposition method is adopted, a zinc salt solution with a molar concentration of 1-150 mM and a hexamethylene tetramine solution are used as raw materials, a blank substrate is placed inside a microwave digestion container, then the container is sealed and placed in a microwave digestion instrument, and after the reaction is carried out at 50-180 DEG C for 0-4 hours, natural cooling is carried out so as to realize the oriented growth of a high-crystallinity film composed of ZnO nanorod arrays on the substrate, wherein the diameter of the nanorods is about50-300 nm. The microwave-hydrothermal method provided by the invention combines the advantages of microwave and hydrothermal methods, improves the film crystallinity, and significantly improves the film quality. The synthesis method has the advantages of short synthesis time, low synthesis temperature and no need for induced hydrothermal deposition of seed crystals; and the grown ZnO film with the nanorod structure has the advantages of uniform micro morphology, good crystallinity and growth direction perpendicular to the substrate, and is suitable for industrial production.

The invention provides a C/C, Ni and Cu composite material and a preparation method and application thereof. According to the preparation method, chopped carbon fiber is used as a framework; a carbonlayer is deposited on the surface of the carbon fiber through microwave hydrothermal reaction; glucose is used as a carbon source, nickel nitrate hexahydrate is used as a nickel source, urea is used as a precipitant, and C and NiO particles are deposited in a carbon fiber prefabrication through the hydrothermal technology; a C/C and NiO composite material through hydrothermal deposition is subjected to sintering by using vacuum carbothermic reduction to obtain a C/C and Ni composite material; catalytic graphitization of matrix carbon is achieved; and by utilizing the infinite miscibility of Niand Cu, the C/C, Ni and Cu composite material is prepared through the melting copper infiltration technology, so that the C/C, Ni and Cu composite material with excellent properties is obtained.

The invention provides a preparation method of a CoPi/Ag/bismuth vanadate composite photoelectric anode material. According to the method, CoPi/Ag is successfully loaded on the surface of BiVO4 by hydrothermal deposition to form a stable photoelectric anode composite thin film CoPi/Ag/BiVO4. The functions of plasma Ag nanoparticles and the Co-Pi cocatalyst are utilized to expand the visible lightabsorption range of bismuth vanadate, and thus the light can be effectively captured, the charge transfer resistance is reduced, and the rapid migration of the charge carrier is accelerated, thereby the recombination of electron-hole pairs is inhibited, and photoelectrocatalytic properties of the BiVO4 composite photoelectric anode is improved.

The invention relates to a porous electrode as well as a preparation method for conductive treatment and application thereof. Plant fibers and nanocellulose are introduced into a conventional electrode pulping and coating technological process, and a three-dimensional mesh structure is formed during the drying process of an electrode material by utilizing the excellent water absorption and water retention of the plant fibers and the nanocellulose. The porous electrode is further wetted and coated with conductive slurry, and a conductive path is formed along the three-dimensional mesh structureof the porous electrode, thereby improving the conductivity of the electrode, and significantly enhancing the energy density and power density of capacitors or lithium ion capacitors. The contradiction between electrochemical deposition, hydrothermal deposition and other electrode morphology control technologies and large-scale production is solved, and the technical problems of incapability of controlling the electrode morphology and the like in the conventional slurry coating process is solved. At the same time, the preparation process has the advantages of high efficiency and simplicity.

The invention provides a preparation method of a Zn/adhesive-free ZSM-11 molecular sieve catalyst. The method comprises the following specific steps: exchanging a synthesized Na-type adhesive-free ZSM-11 molecular sieve with a 0.5 to 1.0mol/L ammonium nitrate solution at the temperature of 70 to 90 DEG C, drying, calcining, and performing steam treatment to prepare an H-type molecular sieve; loading metal zinc on the obtained molecular sieve in an amount of 0.5 to 10.0 percent by weight through a hydrothermal deposition method, drying and calcining to obtain a desired catalyst. Compared with a Zn-loaded ZSM-11 molecular sieve catalyst only containing a silicon oxide adhesive, the Zn-loaded adhesive-free ZSM-11 molecular sieve catalyst has the advantage that the butane transformation rate and the aromatic hydrocarbon yield are increased.

The invention discloses a preparation method and application of a super-hydrophobic glass fiber composite oil-water separation material, and the preparation method of the material comprises the following steps: dissolving basic cupric carbonate in an alkali solution to obtain a mixed solution I; impregnating a glass fiber felt in the mixed solution I to obtain a CuO glass fiber felt; dissolving polydimethylsiloxane in an organic solvent to obtain a mixed solution II; and soaking the CuO glass fiber felt in the mixed solution II, and carrying out high-temperature curing treatment to obtain the super-hydrophobic glass fiber composite oil-water separation material. The super-hydrophobic glass fiber composite oil-water separation material is prepared by loading a copper oxide crystal and a polydimethylsiloxane (PDMS) solution onto the surface of a glass fiber composite material by using a hydrothermal deposition method and an excessive impregnation method respectively. Due to ultrahigh hydrophobic and oleophylic properties and a superposable combination mode, the material has a good demulsification effect on various emulsified oil, and can be widely applied to oil-water separation operation.

The present invention discloses a hydroxyapatite coating based on polyether-ether-ketone and a preparation method thereof. The preparation method comprises the following steps: mixing polyether-ether-ketone powder and Ca(OH)2 powder, carrying out tabletting molding, and carrying out heat treatment, so as to obtain a composite substrate material; pretreating a composite substrate material; placing a substrate material in the hydrothermal solution, and heating to complete hydrothermal deposition; and washing a hydrothermal deposition sample, drying, and preserving heat to obtain the hydroxyapatite coating on the surface of the PEEK and Ca(OH)2 composite material substrate. The coating prepared by adopting the method is of a dense nano columnar structure, is firmly combined with a matrix, can effectively solve the problem of biological inertia on the surface of PEEK, can be well attached to the surface of bone tissue, remarkably promotes the osteogenesis function of cells, and is beneficial to implantation and use of a substrate material; and the coating is suitable for industrial large-scale production and has a good application prospect.

A metal oxide layer can be deposited onto surface of a structure in-situ, by exposing the surface to a precursor solution at an elevated temperature. The precursor solution contains: an organometallic, an oxidant, a surfactant, a chelating agent and water. The precursor solution is injected into the structure and maintained at a specific temperature, pH level, and pressure for a predetermined period of time. The resulting metal oxide layer is permanently attached to the structure's surface with a molecular interface bond and does not require post deposition heat treatment or additional injections of materials. As a result, the electrochemical corrosion potential of the metal surface decreases to less than −230 mV_SHE and corrosion in the BWR is mitigated.

The invention provides a preparation method of a corrosion-inhibition anion intercalation hydrotalcite film, which solves the problems in the prior art of complex preparation technology and poor adhesion property of hydrotalcite film coatings. The preparation method comprises the following steps: a) pretreatment of a magnesium alloy sample; b) preparation of a layered dihydroxy composite metal oxide precursor (LDHs sol); c) hydro-thermal deposition of the magnesium alloy sample obtained in pretreatment in step a) and the LDHs sol in step b) in a hydro-thermal reaction vessel. The film prepared in the invention is dense, smooth, uniform in thickness, and good in substrate bonding force; since the hydrotalcite film has a corrosion-inhibition anion intercalation, a corrosion inhibition area can be formed in a boundary diffusion layer, which provides the film with high corrosion resistance. Detection shows that the hydrotalcite film of the invention has no pitting corrosion on the surface after soaked in a 3.5% NaCl solution for 12 hours.