123results about How to "Large average pore size" patented technology

The present invention relates to biomedical implants for bone substitution and replacement applications. The implant includes a strong, porous polymeric or thermoplastic compositions and growth-enhancing compositions.

A honeycomb structure 10 of the present invention is provided with porous partition walls 12 made of a ceramic material containing cordierite as a main crystal phase and separating and forming a plurality of cells 14 functioning as fluid passages. The partition walls 12 contain sodium at 0.08 to 0.15 mass % in terms of sodium oxide. A honeycomb structure having a large average pore size can be provided.

The invention discloses a dip-coated barium-tungsten cathode for traveling-wave tubes and a preparation method thereof. The dip-coated barium-tungsten cathode comprises a cathode drum, a cathode spongy body positioned inside the cathode drum. The invention is characterized in that the cathode spongy body is laminated by a tungsten spongy body and a tungsten-rhenium spongy body, wherein the tungsten-rhenium spongy body is coated with a noble metal film on the surface. With the above structure and preparation method, compared with the prior art, the cathode spongy body is a two-layered cathode spongy body laminated by the tungsten spongy body and the tungsten-rhenium spongy body, to replace the single-layer alloy substrate with uniform porosity in the prior art; the consumption of the noble metal Re is reduced; the porosity of the tungsten spongy body is increased; the storage level of cathode salts is increased; and the preferable proportion of the cathode salts allows both the emission behavior and the stability of salts better. With the noble metal Re coating, the cost of target materials is reduced. The consumption of noble metal is greatly reduced while ensuring the maximal emission and long service life of alloy substrate film-coated cathodes. The storage quantity of cathode salts is increased and the service life of cathode is prolonged.

The invention relates to a super-porous polysaccharide microsphere product and a preparation method thereof. The mean grain size of the microsphere is 1-500 microns and the mean bore diameter of the microsphere is controllable within a range of 90-800 nm. The preparation method of the super-porous polysaccharide microsphere comprises the following steps of: adding a high-content water-soluble surfactant to a water phase; dispersing the water-phase containing the surfactant to an oil phase to obtain large ports through oil-absorption swelling action of a micelle formed by the surfactant; and preparing the super-porous microsphere through crosslinking and curing of the larger pores. The product can be used as a separating and purifying medium, an immobilized enzyme carrier, a catalyst carrier or a high-efficiency adsorbent and is particularly suitable for being used as a separating medium for biological macromolecules.

A pretreatment method for increasing the average pore size of a catalyst support is disclosed which increases the diffusivity and effectiveness factor η. The pretreatment method includes calcining the support in moisturized air at an elevated temperature sufficient to increase the average pore size. In some embodiments, the support may be treated with an acidic/basic solution prior to the calcination step. Alternatively, the calcination step may occur in a gas mixture including water/air/acidic (or basic) gases.

A hydrated alumina containing metal elements and the preparation method is provided. The alumina after being roasted contains 50-99 percent by weight of alumina and one species or a plurality of species of metal oxide selected from Cu, Fe, V, Cr, Mn, Zr, Zn, Co, Ti and Mo, wherein firstly, the content of the Cu, Fe, V, Cr, Mn and Zr is 0.5-50 percent; secondly, the content of the Zn, Co, Ti and Mo is 10- 50 percent. The catalyst adopting the hydrated alumina preparation provided by the present invention has higher heavy oil conversion capability and lower gasoline sulfur content.

The invention discloses a preparation method of a bi-metal cyanide catalyst, which comprises the following steps: under the condition of stirring, respectively preparing water soluble metal salts and water soluble metal cyanide salts into a reverse microemulsion; under the condition of stirring, dropwise adding and mixing the two reverse microemulsions so as to generate a precipitate; and separating the precipitate, cleaning the obtained product by using an aqueous solution of an organic solvent, and drying the obtained product so as to obtain the bi-metal cyanide catalyst. The catalyst prepared by using the method disclosed by the invention has the advantages that the yield is high, the average aperture is large, a multistage porous structure with certain middle holes and large holes is formed, and in a reaction process of synthesizing poly (propylene carbonate) polyols through catalytic copolymerization of carbon dioxide and propylene oxide, the improvement of the mass transfer of reactants and reaction products on the surface of the catalyst and the heat transfer in a process of high exothermic reaction is facilitated.

A friction material comprises a base and a porous friction generating layer penetrating into and integral with the base. The base presents a bonding surface. The porous friction generating layer presents a friction generating surface facing opposite the bonding surface of the base. The porous friction generating layer comprises fibers and friction adjusting particles, and about 30 to about 95% of a total surface area of the fibers is in contact with the friction adjusting particles. A curable resin is dispersed throughout the porous friction generating layer and the base.

The present invention relates to a methanol-to-aromatic hydrocarbon catalyst and uses thereof. A purpose of the present invention is mainly to solve the problems of low selectivity and poor catalyst stability in the conversion of methanol into aromatic hydrocarbons in the prior art. The technical scheme of the present invention comprises that a modified mesoporous and microporous compounded molecular sieve is adopted as a catalyst, methanol is adopted as a raw material, and the raw material is subjected to an aromatization reaction at a reaction temperature of 360-500 DEG C under a reaction pressure of 0-1.0 MPa at a raw material mass space velocity of 0.4-8 h<-1> under the effect of the catalyst. With the technical scheme, the problems in the prior art are well solved. The catalyst of the present invention can be used for the industrial production of methanol-to-aromatic hydrocarbon.

The invention discloses preparation of an iron, cerium and manganese catalyst for eliminating low-concentration nitric oxide at normal temperature. The catalyst is formed by synthesizing oxalic acid precipitated ferric salt, ceric salt and manganic salt, with the specific surface area being 87-141 m<2>/g and the average pore size being 4.8-7.0 nm. The catalyst can be used for the normal temperature catalytic oxidation of low-concentration nitric oxide, and has higher nitric oxide elimination property. When the concentration of nitric oxide is smaller than or equal to 10 ppm, the nitric oxide elimination rate of the catalyst can reach about 100 percent, and the service life of the catalyst can keep long while maintaining the elimination rate. The preparation has the characteristics of simple preparation technology, low cost and the like.

The invention provides a control method of a plant root rot disease. The control method comprises the following specific steps: leveling soil, applying biological organic fertilizer to the soil, uniformly stirring, and then covering with a black mulching film for 7 days; selecting an excellent variety, using 4-5 parts of foliar fertilizer, 0.4-0.5 part of agricultural avermectin and 1000 parts ofwater according to the parts by weight for preparing seed soaking liquid, soaking seeds for 3-5 hours, taking out and sowing; spraying the foliar fertilizer for 5-7 times in the plant growth period, and spraying 100-200 millimeter of foliar fertilizer per mu; and applying amino acid liquid fertilizer to the roots of plants once every 15 days in the seedling stage and vigorous growth period of theplants. The control method has beneficial effects that the organic fertilizer can provide abundant nutrients to crops and promote the growth of plant roots; added beneficial bacteria can effectively inhibit the growth and reproduction of pathogenic bacteria, purify the soil and improve the soil structure; and the control method has a significant effect on the control of the root rot disease.

The invention provides a light pervious concrete sidewalk surface brick and a preparation method thereof, and belongs to the technical field of building materials. The side walk surface brick is prepared from, by mass, 20-30% of ground furnace slag, 5-10% of cement, 5-10% of coal ash, 15-30% of pottery sand, 0-10% of river sand, 2-4% of exciting agent, 3-5% of saltpetering inhibitor, 0.1-0.3% of physical foaming agent, 2-4% of chemical foaming agent, 1-3% of manganese dioxide, 2-4% of potassium carbonate, 1-3% of water reducer and 15-25% of water. The invention further provides a preparation method for the sidewalk surface brick. According to the developed light pervious concrete sidewalk surface brick, a method of staged physical and chemical collaborative foaming is firstly adopted, thephysical foaming agent is used for forming a large number of airtight air holes inside a substrate, and the continue air entraining effect of the chemical foaming agent is utilized to make adjacent air holes be communicated, therefore a large number of communicated hole gaps are formed inside concrete. The brick has better permeable performance and better water storage performance and has a wide popularization application prospect.

The invention belongs to the field of electrochemistry and energy material, and discloses a preparation method of a biomass derivative carbon material used for sodium-ion batteries. According to the preparation method, soybean is taken as a biomass source, KOH is taken as an activator, high temperature calcining is carried out so as to obtain the porous biomass derivative carbon material. Soybeanis a natural product, is abundant in sources, is high in protein content, contains a large amount of nitrogen element, and is capable of forming a natural nitrogen doped carbon material; the nitrogendoped carbon material can be used for providing Na<+> with sufficient sodium embedding vacancies, providing substantial fake capacitance in sodium-ion battery charging and discharging process, and increasing battery specific capacity; and in addition, nitrogen element doping is capable of improving material conductivity, and increasing iron transmission efficiency; KOH activation is capable of increasing porous structure specific surface area further, it is beneficial for electrolyte infiltration, and increasing of ion and electron transmission efficiency. The biomass derivative carbon material possesses the above advantages, so that when the biomass derivative carbon material is taken as a sodium ion anode material, relatively high reversible specific capacity and excellent circulation stability are achieved.

The invention discloses a closestool cover coating capable of purifying the air. The closestool cover coating comprises raw materials in parts by weight: 35-45 parts of aqueous acrylic resin, 20-30 parts of aqueous polyurethane resin, 20-30 parts of aqueous alkyd resin, 10-15 parts of modified medical stone powder, 5-9 parts of diatomite, 6-9 parts of calcinated kaolin, 2-4 parts of tourmaline powder, 1-3 parts of hexacyclic stone powder, 3-4 parts of gas-phase silicon oxide, 1-2 parts of tween-60, 2-3 parts of zinc stearate, 2-4 parts of polyethyleneglycol , 1-3 parts of methyl hydroxypropyl cellulose, 1-3 parts of a leveling agent, 0.5-2 parts of a de-foaming agent, 2-4 parts of a preservative and 2-4 parts of a drier. The closestool cover coating capable of purifying the air, disclosed by the invention, has excellent ability to absorb stink substances in a washing room, can release negative ions to realize the effect of air purification, and has excellent weather resistance stability and flexibility.