The invention provides a method for preparing a technetium-99m tricarbonyl intermediate. The method comprises reacting a manganese carbonyl compound used as a carbon monoxide source with pertechnetate and water to obtain the technetium-99m tricarbonyl intermediate. The method for preparing a technetium-99m tricarbonyl intermediate in an embodiment of the invention can complete the preparation of the intermediate at atmospheric pressure and room temperature. The method is easy to operate, uses easily obtained raw materials, has a high labeling yield, and can be used to prepare various types of technetium tricarbonyl labeled probes.

Described herein are zirconium oxychloride clusters comprising zirconium oxychloride and a basic amino acid. Personal care compositions comprising the same, and methods of making and using the same are also described.

It is intended to provide a carbon black which can confer reinforcing properties and low exothermicity, which are usually incompatible, as well as excellent abrasion resistance, when mixed with a rubber component, and is suitable for tire tread rubber that is used particularly under severe driving conditions.

The present invention provides a carbon black having surface free energy .sup.d of 50 to 200 mJ/m.sup.2 determined by a reverse-phase gas chromatography analysis method and a strongly acidic group concentration of 0 to 0.115 mol/m.sup.2.

Provided is a method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries, the method including: a mixing step of obtaining a W-containing mixture of Li-metal composite oxide particles represented by the formula: Li.sub.zNi.sub.1-x-yCo.sub.xM.sub.yO.sub.2 and composed of primary particles and secondary particles formed by aggregation of the primary particles, 2 mass % or more of water with respect to the oxide particles, and a W compound or a W compound and a Li compound, the W-containing mixture having a molar ratio of the total amount of Li contained in the water and the solid W compound, or the W compound and the Li compound of 1.5 or more and less than 3.0 with respect to the amount of W contained therein; and a heat treatment step of heating the W-containing mixture to form lithium tungstate on the surface of the primary particles.

A method for separating a metallofullerene M@C.sub.82, comprises steps of: a) adding a Lewis acid to an extract containing the metallofullerene M@C.sub.82 to react therewith, producing a complex precipitate; b) washing the precipitate, followed by dissolving and filtering to obtain a purified metallofullerene M@C.sub.82 extract, wherein M is one or more selected from the group consisting of lanthanide metals Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb, and Lu; and the Lewis acid is one or more selected from the group consisting of zinc chloride, nickel chloride, copper chloride, zinc bromide, nickel bromide, and copper bromide.

The invention provides a method for preparing a technetium-99m tricarbonyl intermediate. The method comprises reacting a manganese carbonyl compound used as a carbon monoxide source with pertechnetate and water to obtain the technetium-99m tricarbonyl intermediate. The method for preparing a technetium-99m tricarbonyl intermediate in an embodiment of the invention can complete the preparation of the intermediate at atmospheric pressure and room temperature. The method is easy to operate, uses easily obtained raw materials, has a high labeling yield, and can be used to prepare various types of technetium tricarbonyl labeled probes.

Activated aluminum sesquichlorohydrate (AASCH) powders prepared by (a) diluting the concentrated aluminum sesquichlorohydrate (ASCH) solution to from about 10% to about 25% by weight, (b) heating the diluted solution to obtain a Band III polymer concentration of at least about 20% and a Band IV polymer concentration of at least about 15%, (c) drying the heated solution to powders, and (d) optionally screen or light mill the powders to free flowing spherical particles are disclosed.

Provided is an iron oxide powder for a brake friction material which can be suitably used in a brake friction material that is less likely to cause problems regarding brake squealing and that provides superior braking performance. The iron oxide powder for a brake friction material according to a first embodiment of the present invention is characterized by having a sulfur content of 150 ppm or less as measured by combustion ion chromatography, and a saturation magnetization of 20 emu/g or less. The iron oxide powder for a brake friction material according to a second embodiment of the present invention is characterized by having an average particle size of 1.0 m or more, a chlorine content of 150 ppm or less as measured by combustion ion chromatography, and a saturation magnetization of 20 emu/g or less.

An object of the present invention is to provide a novel complex having at least two carbon-carbon double bonds and/or carbon-carbon triple bonds. The present invention provides a complex represented by a structural formula (2): ##STR00001## [In the structural formula (2), M.sup.1 to M.sup.4 are identical to or different from each other and represent a metal atom, R.sup.1 to R.sup.6 are identical to or different from each other and represent a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, an alkenyl group having 2 to 18 carbon atoms or an alkynyl group having 2 to 18 carbon atoms, and at least two of R.sup.1 to R.sup.6 are the alkenyl group having 2 to 18 carbon atoms or the alkynyl group having 2 to 18 carbon atoms.].

Provided is a surface-modified nanodiamond having excellent dispersibility in an organic solvent, and a method capable of introducing various surface-modifying groups and easily producing surface-modified nanocarbon particles with little zirconia contamination. The surface-modified nanodiamond includes nanodiamond particles and a group that surface-modifies the nanodiamond particles and is represented by Formula (1): XR.sup.1 (1) [where X represents NH, O, OC(?O), C(?O)O, NHC(?O), C(?O)NH, or S; the bond extending left from X is bonded to a nanodiamond particle; R.sup.1 represents a monovalent organic group that does not have a hydroxy group, carboxy group, amino group, mono-substituted amino group, terminal alkenyl group, and terminal epoxy group; an atom bound to X is a carbon atom; and a molar ratio of carbon atoms to the total amount of heteroatoms selected from the group consisting of nitrogen atoms, oxygen atoms, sulfur atoms, and silicon atoms is 4.5 or greater.