A problem to be solved is to provide a metal powder having a variety of excellent performances, and, in order to solve such a problem, the present invention provides a metal powder that is composed of many spherical particles; that includes at least one of Ni, Fe, and Co, in which the total content (T.C.) of the Ni, the Fe, and the Co is 50 mass % or more; that has a cumulative 10 vol % particle size D10 of 1.0 m or more; and in which a value Y is 7.5 to 24.0 as calculated by the following mathematical equation: Y=D50S, where D50 represents a cumulative 50 vol % particle size of the powder, represents a true density of the powder, and S represents a specific surface area of the powder.

Magnetic particles (100) have a particle size (134) of 500 nm or less and include a core (110) and a polymer coating (120) that surrounds and encapsulates the core (110). The core (110) includes a metal, metal alloy, or metal oxide of at least one metal such as B, Mg, Al, Mn, Co, Ni, Cu, Fe Sm, Yb, Dy, Gd or Er and Nb. The magnetic core (100) is a polycrystalline particle and is a superspin glass magnetic material, having a coercivity greater than zero and a magnetic remenance greater than zero at room temperature. Above room temperature and at low field, the magnetic moment of these superspin glass magnetic materials increases with temperature. An in situ hydrolysis/precipitation method from precursor metal salts is used to form the polymer-encapsulated magnetic particles (100).

A gold powder comprising gold having a purity of 99.9% by mass or more and having an average particle size of 0.01 ?m or more and 1.0 ?m or less, a content of a chloride ion is 100 ppm or less, and a content of a cyanide ion is 10 ppm or more and 1000 ppm or less. A total of the content of a chloride ion and the content of a cyanide ion is preferably 110 ppm or more and 1000 ppm or less. The gold powder has improved adaptability to various processes including bonding or the like with a content of a chloride ion, that is, an impurity, optimized. A gold paste using this gold powder is suitably used in various uses for bonding such as die bonding of a semiconductor chip, sealing a semiconductor package, and forming an electrode/wire.

A gold powder comprising gold having a purity of 99.9% by mass or more and having an average particle size of 0.01 ?m or more and 1.0 ?m or less, a content of a chloride ion is 100 ppm or less, and a content of a cyanide ion is 10 ppm or more and 1000 ppm or less. A total of the content of a chloride ion and the content of a cyanide ion is preferably 110 ppm or more and 1000 ppm or less. The gold powder has improved adaptability to various processes including bonding or the like with a content of a chloride ion, that is, an impurity, optimized. A gold paste using this gold powder is suitably used in various uses for bonding such as die bonding of a semiconductor chip, sealing a semiconductor package, and forming an electrode/wire.

Titanium dioxide/sulfonated graphene oxide/silver nanoparticle composite membrane and its preparation method and application are disclosed. Mixing graphene oxide, sodium chloroethanesulfonate, and sodium hydroxide uniformly in the water, and then adding concentrated nitric acid to obtain sulfonated graphene oxide; mixing the aqueous solution of said sulfonated graphene oxide with the aqueous solution of silver nitrate, stirring in the dark, then adding ascorbic acid, and continuing to stir to obtain a silver nanoparticle/sulfonated graphene oxide composite material; dispersing said silver nanoparticle/sulfonated graphene oxide composite material in water, and then deposited on said titanium dioxide nanorods arrays by vacuum deposition, and vacuum dried to obtain titanium dioxide/sulfonated graphene oxide/silver nanoparticle composite membrane. The membrane possessed photocatalytic effect under UV light and special wettability: super-hydrophobic oil under water/super-hydrophobic under oil, which could in situ separation and degradation of oil/water emulsion.

Titanium dioxide/sulfonated graphene oxide/silver nanoparticle composite membrane and its preparation method and application are disclosed. Mixing graphene oxide, sodium chloroethanesulfonate, and sodium hydroxide uniformly in the water, and then adding concentrated nitric acid to obtain sulfonated graphene oxide; mixing the aqueous solution of said sulfonated graphene oxide with the aqueous solution of silver nitrate, stirring in the dark, then adding ascorbic acid, and continuing to stir to obtain a silver nanoparticle/sulfonated graphene oxide composite material; dispersing said silver nanoparticle/sulfonated graphene oxide composite material in water, and then deposited on said titanium dioxide nanorods arrays by vacuum deposition, and vacuum dried to obtain titanium dioxide/sulfonated graphene oxide/silver nanoparticle composite membrane. The membrane possessed photocatalytic effect under UV light and special wettability: super-hydrophobic oil under water/super-hydrophobic under oil, which could in situ separation and degradation of oil/water emulsion.

Provided are a silver powder having powder physical properties enabling reduction of volume resistivity after firing and a method of producing this silver powder. The silver powder has a tap density of 4.8 g/mL or more, a TAP/D50 value (value determined by dividing the tap density (g/mL) by the volume-based median diameter (?m)) of not less than 7 and not more than 15, and a specific surface area of not less than 0.75 m.sup.2/g and not more than 1.3 m.sup.2/g.

The invention relates to particulate lithium metal formations having a substantially spherical geometry and a core composed of metallic lithium, which are enclosed with an outer passivating but ionically conductive layer containing nitrogen. The invention further relates to a method for producing lithium metal formations by reacting lithium metal with one or more passivating agent(s) containing nitrogen, selected from the groups N.sub.2, N.sub.xH.sub.y with x=1 or 2 and y=3 or 4, or a compound containing only the elements C, H, and N, and optionally Li, at temperatures in the range between 60 and 300 C., preferably between 100 and 280 C., and particularly preferably above the melting temperature of lithium of 180.5 C., in an inert organic solvent under dispersion conditions or in an atmosphere that contains a gaseous coating agent containing nitrogen.

The invention relates to particulate lithium metal formations having a substantially spherical geometry and a core composed of metallic lithium, which are enclosed with an outer passivating but ionically conductive layer containing nitrogen. The invention further relates to a method for producing lithium metal formations by reacting lithium metal with one or more passivating agent(s) containing nitrogen, selected from the groups N.sub.2, N.sub.xH.sub.y with x=1 or 2 and y=3 or 4, or a compound containing only the elements C, H, and N, and optionally Li, at temperatures in the range between 60 and 300 C., preferably between 100 and 280 C., and particularly preferably above the melting temperature of lithium of 180.5 C., in an inert organic solvent under dispersion conditions or in an atmosphere that contains a gaseous coating agent containing nitrogen.

A three-dimensional porous catalyst, catalyst carrier or absorbent monolith of stacked strands of catalyst, catalyst carrier or absorbent material, composed of alternating layers of linear spaced-apart parallel strands, wherein the strands in alternating layers are oriented at an angle to one another, wherein the distance between inner spaced-apart parallel strands is larger than the distance between outer spaced-apart parallel strands in at least a part of the layers of the monolith.