50results about How to "Reduce the preparation conditions" patented technology

The invention provides a preparation method for a three-dimensional carbon micro-nano electrode array structure integrating carbon nano-drape. The preparation method comprises the following steps: 1) photoetching to obtain a photoresist microstrucutre with an electrode pattern; 2) depositing a carbon film: depositing one layer of carbon film on the photoresist microstrucutre; and 3) performing pyrolysis: performing multi-step pyrolysis under the environment of inert gas or other mixed gas, wherein the pyrolysis temperature at each step is different. According to the preparation method, the carbon micro-nano integrated structure by combining the carbon nano-drape and the carbon microstructure and generating nano-drape on the surface of the microstructure. Due to integration of the biologically compatible nano-drape carbon film, the specific surface area of the carbon micro-nano electrode array is greatly increased and the bioactivity and the stability of the enzyme are improved. The method is applied to a micro-electro-mechanical system and has the characteristics of simple and convenient process, firm structure and high biocompatibility. The prepared carbon microstructure can serve as a microelectrode and can be applied to the micro-electro-mechanical fields of biological fuel cells, biological chips, micro-electrochemical sensors and the like.

The invention discloses a geopolymer based fibreboard which is mainly composed of liquid water glass, aluminosilicate, wood fibers, reinforcement fibers and the like, and also provides a preparation method of the geopolymer based fibreboard. The preparation method comprises the steps of weighing the various raw materials, adding the aluminosilicate, the wood fibers and the reinforcement fibers to a mixer and stirring evenly to obtain a dry powder, adding the liquid water glass to the dry powder which is mixed thoroughly and evenly, and mixing evenly to obtain a slurry, pouring the thoroughly mixed slurry into a fiberboard mold, slicking, and carrying out extrusion forming with pressure of 2.5MPa, maintaining for 6 hours under natural conditions and then demolding, and maintaining under the natural conditions for 7-10 days to obtain the geopolymer based fibreboard. The geopolymer based fibreboard is high in strength, good in water resistant performance, extremely low in water absorbing expansion rate, simple and convenient in maintenance process conditions, good in sound insulation and heat insulation effects, resistant to high temperatures, low in production cost and harmless to the human body; the geopolymer based fibreboard is capable of overcoming the problems of high energy consumption, high maintenance condition requirements and high production cost of the existing material, and also capable of improving the utilization rate of the industrial waste steel slag.

The invention discloses a preparing method of lactide in the macromolecular material preparing domain, which comprises the following steps: a. adopting L-lactic acid as raw material to obtain the low-molecular polymer of lactic acid; b. placing the low-molecular polymer of lactic acid in the reactor to react; controlling the reacting condition under normal pressure; heating to 150-250 deg.c; c. aerating inert gas into reactor at 200-500 deg.c; carrying the reacting product out of reactor; cooling to 80-150 deg.c; collecting; purifying extracted compound to obtain the product.

The invention discloses a method for fast preparing polycrystalline tetra calcium aluminoferrite. The method includes the steps that firstly, raw materials including calcium nitrate terahydrate, aluminum nitrate nonahydrate, iron nitrate nonahydrate and urea are weighed according to the mass ratio of 1:0.7942:0.8554:2.0413-2.1923; secondly, a proper amount of deionized water is added, and dispersion liquid with the concentration ranging from 0.5 mol/L to 0.8 mol/L is prepared and continuously stirred for 1.5 hours to 2 hours till the raw materials are completely dissolved; thirdly, the dispersion liquid is moved into a high temperature stove and heated to 500 DEG C to 510 DEG C in air atmosphere, after the constant temperature is kept for two hours, the dispersion liquid is taken out and grinded into particles with the particle size smaller than or equal to 0.15 mm, and the particles serve as a precursor ready for use; fourthly, the precursor is pressed into a thin piece with the diameter of 35 mm and the thickness smaller than or equal to 5 mm under the pressure of 25 MPa to 30 MPa; finally, the pressed precursor thin piece is heated to 650 DEG C to 950 DEG C at the heating rate of 10 DEG C/min, after the constant temperature is kept for 7 hours, the pressed precursor thin piece is taken out, fast cooled in the air and grinded, and the polycrystalline tetra calcium aluminoferrite with the hydration activity is obtained. The method is small in working procedure number, short in period and high in efficiency, the sintering temperature is 300 DEG C to 600 DEG C lower than the sintering temperature of a traditional method, and the method has the advantages of being fast, efficient and capable of saving energy, and is suitable for industrial large-scale application.

The invention discloses a catalyst for preparing C5 and C6 alkane through catalyzing a sugar alcohol raw material in a water phase. The structural formula of the catalyst is a Ru-P/carrier, wherein Ru is a metal component and P is an auxiliary agent; the carrier is one of active carbon, a carbon nanotube, silicon oxide and zirconium oxide; the mol ratio of Ru to P is 0.5 to 5; the loading amount of the metal Ru is 1 weight percent to 5 weight percent; the catalyst has very good catalytic activity and hydrothermal stability; the C5 and C6 alkane is prepared in a continuous reaction kettle at low pressure and low temperature through catalyzing the sugar alcohol raw material in the water phase; the sugar alcohol raw material can be completely converted, and the selectivity of the C5 and C6 alkane is up to 90 percent; the energy consumption is low and a technological process is simple and easy to control; the catalyst has a good industrial application prospect and the problem that an existing biomass-based sugar alcohol water-phase catalysis catalyst is not stable is solved.

The invention discloses a method for electrophoresis of dual-color patterns on the metal surface. A masking film of a preset shape is manufactured with hot melt adhesive, and the masking film adheres to the metal surface; a first paint layer is formed in an uncovering area of the masking film through primary electrophoresis; and a second paint layer different from the first paint layer in color is deposited in a covering area of the masking film through secondary electrophoresis after the masking film is removed, and accordingly the patterns of the masking film are transferred to the metal surface. The masking film made of the hot melt adhesive can be removed easily by being dissolved and cleaned with hot water or an organic solvent, strong base or other corrosive matter is not needed, and the film structure cannot be affected; and meanwhile, various dual-color electrophoresis patterns can be formed as needed, the manufacturing process is simple, the appearance life is long, and the application range is enlarged.

The invention relates to a method for synthesizing a tungsten trioxide electrochromic material by one step with assistance of citric acid. The method comprises the following steps: dissolving a tungsten source and a chelating agent in a molar ratio of (0.4-1.2):1 in water, stirring the mixture uniformly, and adding a morphology control agent to obtain a mixed solution, wherein the molar ratio of the morphology control agent to the tungsten source is (0-0.1):1; adjusting the pH value of the mixed solution to be 0.5-2 by acid to obtain a tungsten trioxide precursor solution; placing a conductiveglass substrate in the tungsten trioxide precursor solution, and growing a tungsten trioxide electrochromic nano-material on the surface of the conductive glass substrate at 85-95 DEG C. The method is easy to operate, and has the characteristics of low cost, low temperature requirement and the like.

The invention provides a preparation method of monoclinic phase yttrium oxide. The preparation method comprises the following steps: (1) preparing a yttrium-base coordination polymer; (2) calcining the yttrium-base coordination polymer, so as to obtain cubic phase yttrium oxide; (3) pre-pressing cubic phase yttrium oxide at 2MPa-20MPa; and (4) carrying out high-temperature and high-pressure reaction on pre-pressed cubic phase yttrium oxide at 500-1500 DEGC and 1GPa-5GPa, so as to obtain monoclinic phase yttrium oxide. The preparation method has a series of advantages of simple process, relatively low reaction condition, high product purity and yield and the like. According to the preparation method, a rapid and efficient novel method is provided for the synthesis of monoclinic phase yttrium oxide.

The invention relates to a niobic acid-based sulfide composite material and a preparation method thereof. The structural formula of the niobic acid-based sulfide composite material is AxBySz-H4Nb2O7,in the formula, A and B are one or two of different metal elements of Co, Mo, Ni, Cu, Zn and Fe; x is greater than 0 and smaller than 10; y is greater than or equal to 0 and less than 10; z is greaterthan 0 and smaller than 10; and specific values are determined according to specific valence states of compounds. The preparation method comprises the following steps: weighing tin niobate, adding the tin niobate into a polytetrafluoroethylene lining, adding one or two of soluble metal salts and thiourea, dissolving the components with water, and performing a hydrothermal reaction so as to obtainblack precipitate; performing suction filtration washing on the black precipitate, putting the black precipitate into a vacuum drying tank, and performing drying, so as to obtain an AxBySz-H4Nb2O7 composite material. The composite material is low in preparation condition and simple in operation, sulfides are uniformly grown on the surface of niobic acid, rich reaction activity sites can be provided for reactions, and the reaction activity of metal sulfides in catalysis reactions can be sufficiently improved.

The invention discloses a mullite whisker/fiber synergistically reinforced SiO2 aerogel multi-scale composite structure, a preparation method and application thereof. According to the method, a mullite whisker/fiber reinforcement and a SiO2 aerogel are combined through physical and chemical methods, and a multi-scale composite structure with certain resilience, mechanical strength and low heat conductivity coefficient can be prepared through micron and submicron scale synergistic reinforcement. According to the invention, the conditions that single-scale fiber reinforcement has defects and theactual application requirements cannot be met due to poor mechanical properties of pure SiO2 aerogel are avoided, and the preparation conditions of the SiO2 aerogel composite material are reduced.

The invention provides CO2 emulsion and a preparation method thereof. The emulsion comprises the following components: CO2, lauryl sodium sulfate, other surfactants and water, wherein based on 100 percent of water quality, the lauryl sodium sulfate has the mass percent concentration of 0.001-1 percent; the other surfactants have the mass percent concentration of 0-10.0 percent, preferably 3.0-7.0 percent; and the volume ratio of CO2 to water based on liquid CO2 is (1-5):1. According to the emulsion, the preparation cost and preparation conditions of the CO2 emulsion can be greatly reduced; and meanwhile, the research proves that the CO2 emulsion can be stabilized for more than several hours.

The invention relates to a method of preparing high-purity tricalcium aluminate quickly and is mainly applied to the field of building materials. The method comprises the following steps: by taking analytically pure calcium nitrate tetrahydrate and aluminum hydroxide as raw materials, adding a proper amount of deionized water to prepare a homogeneous solution; then fixing the homogeneous solutionto a magnetic stirrer to be stirred for 10-20 min under the conditions that the temperature is 60-80 DEG C and the rotating speed is 170-200 r/min, adjusting the PH value with ammonia water in the process, wherein the PH value is in a range of 10.5-11.5; placing a sol which is formed in a blowing drying box to be dried for 6-8 h at 60-80 DEG C, ageing and drying the mixture and grinding the mixture till the grain size is 0.075 mm, and pressing the mixture to 4 mm sheets under the pressure of 20 MPa; putting the sheets in a crucible, heating the crucible by an electric furnace, carrying out programmed temperature heating, insulating the mixture for 4 h at 1100 DEG C, and taking out a sample and quenching the sample to prepare high-purity C3A. The method is easily available in use material,simple to operate, few in synthetic process, short in preparation period, low in calcining temperature and low in energy consumption, and has the advantages of being energy-saving and efficient and the like.