35results about How to "Stay porous" patented technology

The invention discloses a preparation method of hollow titanium dioxide microspheres. The preparation method comprises the following steps: firstly, preparing a silicon dioxide particle prefabricate; then, introducing a titanium dioxide sol to cover the surface of silicon dioxide to form a core-shell structure of silicon dioxide-titanium dioxide; then, removing silicon dioxide core structure by using a sodium hydroxide solution; removing impure structures of the microspheres by using hydrochloric acid; and calcining to finally obtain the hollow titanium dioxide microspheres in stable structures. The hollow titanium dioxide microspheres disclosed by the invention not only have high degree of crystallinity and porosity, but also the electron transport efficiency and the photocatalytic degradation effect on organic pollution are improved. The preparation method is simple in preparation process and low in cost, and the synthesized microspheres are stable in structure.

The invention discloses a method for improving the enzymolysis saccharification efficiency of lignocellulose, which comprises the following steps of: (1) crushing a lignocellulose raw material with a water mass of 30-75%, packaging the crushed material in a sealing device, and storing the crushed material; (2) adding the material obtained in the step (1) into a steam explosion reactor, heating the material by using steam, instantaneously releasing pressure so as to obtain a solid-liquid mixture, carrying out e solid-liquid separation on the solid-liquid mixture, carrying out washing and drying on the obtained solid; and (3) adding cellulase and water into the dried matter, adjusting the pH value of the obtained product to be 4.5-5.5, carrying out enzymolysis on the obtained product, and carrying out solid-liquid separation on the obtained product again so as to obtain a liquid rich in glucose and xylose. According to the method disclosed by the invention, the loss of biomass can be reduced, and the flexibility and porosity of a biomass structure can be maintained; the recovery rate of sugar is high, and degradation products are less; and the enzymolysis saccharification rate is significantly increased.

The invention discloses a preparation method of self-support nitrogen-doped porous graphene for a super-capacitor, which is characterized by comprising the following steps: 1) dispersing nano nickel powder into a buffer solution of dopamine/Tris-HCl, carrying out ultrasonic oscillation, and then carrying out mechanical stirring at room temperature for reacting and heating; after paste is formed, pressing the paste into a sheet by using a roller press of which the roller diameter is 50cm, so as to obtain a sheet-shaped nitrogen-doped porous graphene precursor; 2) by taking polydopamine in the sheet-shaped nitrogen-doped porous graphene precursor prepared in the step 1) as a solid precursor and taking nickel as a catalyst and a template, carrying out high temperature sintering in an inert gas sintering furnace, and finally, cooling the sintering product to room temperature in the inert gas, so as to obtain a nickel powder coated sheet of a nitrogen-doped graphene product; and 3) putting the nickel powder coated sheet of the nitrogen-doped graphene product, prepared in the step 2), into strong acid for etching off the nano nickel powder template by the acid, and then, cleaning and drying the sheet in ultra-pure water repeatedly, so as to obtain self-support nitrogen-doped porous graphene. The used raw materials are non-toxic and cheap and are easy to obtain, the process is simple, the cost is low, and nitrogen-doped graphene with a high specific surface area and high quality can be prepared.

The invention discloses a conductive polymer wave-absorption sponge and a preparation method thereof. The conductive polymer wave-absorption sponge is prepared from conductive polymers and polyurethane foamed sponge, wherein the surface of a network framework of the polyurethane foamed sponge is coated with the conductive polymers. According to the conductive polymer wave-absorption sponge and thepreparation method thereof disclosed by the invention, by using the polyurethane foamed sponge as a framework, the conductive polymer wave-absorption sponge is prepared through a gas-phase monomer oxidative polymerization deposition method, so that the properties of flexibility, the porosity and the lightweight of the polyurethane sponge can be maintained, and the electromagnetic property of theconductive polymers is developed, and further, the excellent wide-frequency wave-absorption performance is shown. The preparation method disclosed by the invention has the advantages of simple processand low cost, and is suitable for industrial production.

The invention provides a preparation method of a supported vanadium-substituted Keggin type polyacid desulfurization catalyst porous nanocrystal. The catalyst is formed by using a three-dimensional porous main body framework constituted by copper and trimesic acid through a coordination bond to support vanadium-substituted Keggin type molybdatophosphoric acid. Polyacid is orderly arranged in the main body framework in an object form, and the supporting amount is above 54%. The nanocrystal catalyst can be synthesized by a room-temperature solid phase or room-temperature liquid phase method and be stably dispersed in an oil phase. Under mild conditions, molecular oxygen is taken as an oxidant, and the nanocrystal can efficiently realize catalytic oxidation of aromatic sulfides in fuel oil and further realize deep desulfurization. The catalyst can be recovered by centrifugal operation and be reused mainly times after drying treatment. The preparation method of the polyacid nanocrystal desulfurization catalyst, provided by the invention, is simple, can effectively solve the technical difficult problems of immobilization, separation, recovery, reuse and stable dispersion in the oil phase of the polyacid catalyst, and is suitable for industrial production.

The invention provides a solution for preparing a thymalfasin preparation and a method for preparing the thymalfasin preparation by virtue of the solution. The pH value of the solution is 4-5, and each 1000ml of the solution contains 1-3g of a thymalfasin preparation, 35-55g of a stabilizer, 50-70ml of a cosolvent and the balance of a pH regulator and injection water. The thymalfasin preparation prepared by the solution disclosed by the invention is better in stability and shorter in freeze-drying cycle; and meanwhile, a freeze-dried product is porous.

The invention relates to modification of immobilization of hydrogen-production microorganisms in sludge by an agar embedding method by adding anaerobe agar and gama-alumina. The mass ratio of plain agar to anaerobe agar is 2:1-4:1; the adding amount of gama-alumina is 1.5-2.5%; the volume ratio of agar solution to sludge is 2:3-3:2; after dripping ball formation, the agar balls are inoculated in an anaerobic fermentation hydrogen production system. The anaerobe agar can provide nutrition for hydrogen-production microorganisms, shorten the adaptation period, form certain pore channels after being used by microorganisms, and thus facilitate mass transfer. The gama-alumina is nontoxic, odourless, high in hardness, large in specific surface area, strong in adsorbability, and high in solution penetration rate, facilitates microorganism adhesion, and facilitates the enhancement of the mechanical strength of agar balls and the promotion of the mass transfer process. According to the invention, when the agar embedding method is modified, the cumulative hydrogen production amount is increased, the hydrogen production time delay is shortened, the specific hydrogen production rate is increased, the hydrogen concentration in the produced gas is increased, and continuous and stable hydrogen production by the system is maintained.

The invention discloses a preparation method of dried acorn and belongs to the technical field of food processing. The dried acorn takes single acorn starch as a raw material and the preparation method of the dried acorn comprises the steps of starch gelatinization, cooling, cold knife cutting, airing, freezing and low-temperature heat pump drying. No additives are added in the whole dried acorn processing process, the method conforms to the green food concept, the quality is easy to control, the nutritional ingredients of the acorn starch are kept to the greatest extent, and the dried acorn has good rehydration, flat appearance and bright color and belongs to a high-end acorn starch product.

The invention provides a rifampicin composition freeze-dried orally disintegrating tablet and a preparation method thereof, relates to the technical field of medicines and medicine preparation methods, and mainly solves the problem that a common rifampicin preparation is excessive in first-pass effect and strong in side effect after repeated administration, and is difficultly swallowed by old people and children. The rifampicin composition freeze-dried orally disintegrating tablet is prepared from components including, by weight, 30%-60% of rifampicin, 25%-70% of mannitol, 2%-4% of gelatin, 0.1%-0.15% of sucralose and 50%-70% of tert-butanol-water. The rifampicin composition freeze-dried orally disintegrating tablet prepared from the components according to the weight percent is simple in preparation process and composition, mainly aims to meet the administration requirements of the children, and has the advantages of rapidness in disintegration and effectiveness, sufficiency in medicine absorption, convenience in taking, fine taste and avoidance of the first-pass effect of livers.

The invention discloses a low-temperature battery formation process. The battery formation process is characterized in that cost is saved by adjusting the formation process and the material preparation process, battery weight can be further reduced, low-temperature performance of the battery is improved, the charging process has the advantage that the current is fixed according to the area of a to-be-formed product, the charging and discharging amounts are determined according to the mass of active matters, a hydrogen evolution voltage is always utilized as a control key point, porosity of a negative electrode of the battery is ensured to a greater extent, and the charging process is more scientific and reasonable than other charging processes determined according to the charging time, sothe product produced by the technical scheme has characteristics of high stability and high consistency and is mainly reflected in key indexes such as product service life and specific energy. The battery formation process is advantaged in that the constant temperature effect is mainly adopted in the formation stage, the temperature of the battery is constantly controlled between 20 DEG C and 45 DEG C, in the temperature state, the charging current utilization rate is the highest, materials in a polar plate cannot be oxidized, and then the produced battery further has characteristics of high low-temperature capacity and long service life.

The invention provides a porous fluid as well as a preparation method and application thereof. The preparation method comprises the steps that: 2-methylimidazole and N-(3-azide)-N, N-dioctyl-N-methyl ammonium bromide are dissolved in an organic solvent, under the protection of inert gas, COR and PMDETA are added, stirring is conducted for 8-14 h at the room temperature, and a crude product A is obtained; the crude product A is purified and dried to obtain a substance A; the substance A, PEGS and an ethanol solution are mixed, a reaction is performed at 60-80 DEG C for 8-14 hours, and dialyzing is performed for 60-80 hours to obtain an ionic liquid for later use; and nano-scale MOFs are dispersed in an ethanol solution, then the ionic liquid obtained in S2 is added, uniform mixing is performed, shaking is performed for 8-14 hours, the solvent is removed, and drying is performed to obtain the porous fluid. The porous fluid provided by the invention has both flowability and porosity, and has a wide application prospect.

The invention discloses an anti-fouling heat dissipation composite board and a preparation method thereof, and relates to the technical field of new materials. The preparation method comprises the following steps of: firstly, sequentially reacting pretreated straws subjected to alkali boiling, peeling and crushing with glycidyl methacrylate and polyethyleneimine under the action of an emulsifier OP-10 and benzoyl peroxide to prepare modified straws; then mixing the modified straws with a copper ion solution, and carrying out micro-crosslinking in an organic solvent by using carbon dioxide to obtain mixed modified straws; then mixing the mixed modified straws with an isocyanate adhesive, spreading the mixture between two polypropylene micro-porous membranes, and carrying out hot press molding to obtain a composite board blank; and finally treating the composite board blank with dopamine, then fumigating the composite board blank with an acid solution, and drying the composite board blank to obtain the anti-fouling heat dissipation composite board. The anti-fouling heat dissipation composite board prepared by the invention has excellent heat dissipation performance and good oil stain resistance.