Abstract: There is provided a DDR-type zeolite powder composed of fine particles and exhibits a particle size distribution where the majority of the particles have particle diameters converging in the vicinity of the mean particle diameter, and a process for the production of the same. Specifically provided is a process for the production of a DDR-type zeolite powder, which comprises a step of heat-treating a raw material solution at 100 to 180° C., and thereby growing crystals until the mean particle diameter reaches to a level of 0.1 ?m or more and below 2.5 ?m.

Abstract: A method is provided for producing a DDR type zeolite membrane, including a membrane formation step of immersing a porous substrate having a DDR type zeolite seed crystal adhered thereon, in a raw material solution containing 1-adamantaneamine, silica (SiO2) and water, and conducting a hydrothermal synthesis of DDR type zeolite to form a 1-adamantaneamine-containing DDR type zeolite membrane on the porous substrate to produce a precursor of DDR type zeolite membrane-containing body, and a burning step of heating the precursor at 400° C. or above and at 550° C. or below to burn and remove the 1-adamantaneamine contained in the DDR type zeolite membrane.

Abstract: A method for manufacturing a DDR zeolite membrane element including the steps of: immersing a porous substrate in a raw material solution, forming a DDR zeolite membrane containing 1-adamanthanamine on a surface of the porous substrate by subjecting a DDR zeolite to hydrothermal synthesis in the presence of DDR zeolite seed crystals, applying a glass paste onto the surface of the porous substrate so as to contact the membrane, and heating the membrane at 500 to 800° C., thereby burning away the 1-adamanthanamine contained in the membrane and melting the glass paste to form a membrane-like glass seal contacting the membrane on the surface of the porous substrate. The method for manufacturing a DDR zeolite membrane element can inhibit the permeation of the DDR zeolite membrane from being hindered in a contact portion between the membrane and the glass seal and inhibit poor seal of the glass seal.

Abstract: There is provided a DDR-type zeolite powder composed of fine particles and exhibits a particle size distribution where the majority of the particles have particle diameters converging in the vicinity of the mean particle diameter, and a process for the production of the same. Specifically provided is a process for the production of a DDR-type zeolite powder, which comprises a step of heat-treating a raw material solution at 100 to 180° C., and thereby growing crystals until the mean particle diameter reaches to a level of 0.1 ?m or more and below 2.5 ?m.

Abstract: A separation membrane complex where a carbon membrane is formed directly on a porous body (surface layer) and an intermediate layer has a thickness of 10 to 100 ?m can be used as a filter having improved flux and selectivity in comparison with a conventional one.

Abstract: A porous substrate with a seed crystal-containing layer for manufacturing a zeolite membrane includes: a ceramic porous substrate, and a seed crystal-containing layer containing a zeolite powder to function as a seed crystal for forming a zeolite membrane and a ceramic powder and being loaded on a surface of the ceramic porous substrate and fired to fix the seed crystal-containing layer on the porous substrate. The porous substrate with a seed crystal-containing layer used for manufacturing a zeolite membrane inhibits a defect such as a crack from being generated in the zeolite layer upon manufacture or use by manufacturing a zeolite membrane by the use of the substrate which then can be subjected to air-spraying, washing, and processing for the purpose of removing a foreign substance, etc., prior to hydrothermal synthesis.

Abstract: A method for manufacturing a DDR zeolite membrane element including the steps of: immersing a porous substrate in a raw material solution, forming a DDR zeolite membrane containing 1-adamanthanamine on a surface of the porous substrate by subjecting a DDR zeolite to hydrothermal synthesis in the presence of DDR zeolite seed crystals, applying a glass paste onto the surface of the porous substrate so as to contact the membrane, and heating the membrane at 500 to 800° C., thereby burning away the 1-adamanthanamine contained in the membrane and melting the glass paste to form a membrane-like glass seal contacting the membrane on the surface of the porous substrate. The method for manufacturing a DDR zeolite membrane element can inhibit the permeation of the DDR zeolite membrane from being hindered in a contact portion between the membrane and the glass seal and inhibit poor seal of the glass seal.

Abstract: A method for producing a DDR type zeolite membrane, which method comprises a membrane formation step of immersing a porous substrate having a DDR type zeolite seed crystal adhered thereon, in a raw material solution containing 1-adamantaneamine, silica (SiO2) and water, and conducting a hydrothermal synthesis of DDR type zeolite to form a 1-adamantaneamine-containing DDR type zeolite membrane on the porous substrate to produce a precursor of DDR type zeolite membrane-containing body, and a burning step of heating the precursor at 400° C. or above and at 550° C. or below to burn and remove the 1-adamantaneamine contained in the DDR type zeolite membrane.

Abstract: A separation membrane complex 1 where a carbon membrane 66 is formed directly on a porous body 61 (surface layer 64) and an intermediate layer 63 has a thickness of 10 to 100 ?m can be used as a filter having improved flux and selectivity in comparison with a conventional one.

Abstract: There is disclosed a separation device of a gas or a liquid to which a separation body is installed, the separation body being constituted by using a porous multilayered structure baggy tubular body as a basal body and forming a separation membrane of the gas or the liquid on the surface of the basal body. In this separation device, the porous multilayered structure baggy tubular body includes a porous basal body having a baggy tubular shape in which one of openings of a tubular portion is closed with a baggy portion, and one or a plurality of porous layers formed on the side of one surface of the porous basal body and having an average pore diameter smaller than that of the porous basal body, so that a surface area of the separation membrane of the gas or the liquid per unit voltage is large.

Abstract: A porous substrate with a seed crystal-containing layer for manufacturing a zeolite membrane includes: a ceramic porous substrate, and a seed crystal-containing layer containing a zeolite powder to function as a seed crystal for forming a zeolite membrane and a ceramic powder and being loaded on a surface of the ceramic porous substrate and fired to fix the seed crystal-containing layer on the porous substrate. The porous substrate with a seed crystal-containing layer used for manufacturing a zeolite membrane can inhibit a defect such as a crack from being generated in the zeolite layer upon manufacture or use by manufacturing a zeolite membrane by the use of the substrate and can be subjected to air-spraying, washing, and processing for the purpose of removing a foreign substance, etc., prior to hydrothermal synthesis.

Abstract: There is provided a substrate material for wiring having an excellent thermal resistance, and durability and reliability under severe conditions, characterized in that said substrate material comprises an insulator whose major component is composed of epoxy resin and ceramics having a thermal expansion coefficient of 2 ppm/° C. or less, and that the thermal expansion coefficient is isotropic.

Abstract: Granulated powder for molding produced by granulating material powder, whose variation factor (the standard deviation of strength/average strength) of the compressive strength of each granular particles composing granulated powder is 0.3 or less. By using granulated powder for molding of the present invention, sintered bodies with preferred properties, in particular with high strength can be produced stably.

Abstract: A high-strength silicon nitride sintered body wherein the halogen element content in the silicon nitride sintered body is 200 ppm or higher. The silicon nitride sintered bodies have high strength at near room temperature. Therefore, such sintered bodies may be used favorably as a structural material for mechanical parts and the like, such as sliding members, whose strength at near room temperature is important.