Glass-coated aluminum nitride particles and a method for producing the same. The glass-coated aluminum nitride particles include aluminum nitride particles and a glass phase which covers at least a part of the surface of each aluminum nitride particle. The glass phase is a composition which contains at least a glass component; and the proportion of the composition containing a glass component is 0.2 parts by weight to 5.0 parts by weight with respect to 100 parts by weight of the aluminum nitride particles. The composition containing the glass component further contains boron nitride particle; and the aluminum nitride particles have a volume cumulative d50 of from 10 μm to 200 μm.

Glass-coated aluminum nitride particles and a method for producing the same. The glass-coated aluminum nitride particles include aluminum nitride particles and a glass phase which covers at least a part of the surface of each aluminum nitride particle. The glass phase is a composition which contains at least a glass component; and the proportion of the composition containing a glass component is 0.2 parts by weight to 5.0 parts by weight with respect to 100 parts by weight of the aluminum nitride particles. The composition containing the glass component further contains boron nitride particle; and the aluminum nitride particles have a volume cumulative d50 of from 10 μm to 200 μm.

The present invention provides a novel surface-modified inorganic substance obtained by modifying the surface of an inorganic nitride or an inorganic oxide with a boronic acid compound, and a heat dissipation material, a thermally conductive material, and a lubricant which use the surface-modified inorganic substance. The present invention also provides a method for manufacturing the surface-modified inorganic substance, and provides, as a novel method for modifying the surface of an inorganic substance selected from an inorganic oxide and an inorganic nitride with an organic substance, a method for modifying the surface of an inorganic nitride or an inorganic oxide with an organic substance that includes making a contact between the inorganic nitride or the inorganic oxide with a boronic acid compound.

An aluminum nitride powder containing a very small amount of coarse particles. An aluminum nitride powder which provides a resin composition having high affinity for resins and high moisture resistance. The aluminum nitride powder has a volume average particle diameter D50 of 0.5 to 7.0 μm in particle size distribution measured with a laser diffraction scattering particle size distribution meter, a D90/D50 ratio of 1.3 to 3.5 and a BET specific surface area of 0.4 to 6.0 m.sup.2/g and classified by removing coarse particles whose particle diameter is more than 5 times as large as D90. When resin paste obtained from this aluminum nitride powder and a resin is measured with a grind gauge, the upper limit particle diameter at which a streak is produced is not more than 5 times as large as D90. Since the classified aluminum nitride powder is surface modified, the aluminum nitride powder which has high filling property in a resin and is excellent in the moisture resistance and insulating property of a resin composition is obtained.

An aluminum nitride powder containing a very small amount of coarse particles. An aluminum nitride powder which provides a resin composition having high affinity for resins and high moisture resistance. The aluminum nitride powder has a volume average particle diameter D50 of 0.5 to 7.0 μm in particle size distribution measured with a laser diffraction scattering particle size distribution meter, a D90/D50 ratio of 1.3 to 3.5 and a BET specific surface area of 0.4 to 6.0 m.sup.2/g and classified by removing coarse particles whose particle diameter is more than 5 times as large as D90. When resin paste obtained from this aluminum nitride powder and a resin is measured with a grind gauge, the upper limit particle diameter at which a streak is produced is not more than 5 times as large as D90. Since the classified aluminum nitride powder is surface modified, the aluminum nitride powder which has high filling property in a resin and is excellent in the moisture resistance and insulating property of a resin composition is obtained.

Disclosed is a free atom nanotube growth technology capable of continuously growing long, high quality nanotubes. This patent application is a Continuation In Part of the Trekking Atom Nanotube Growth patent application #14037034 filed on Sep. 25, 2013. The current invention represents a departure from chemical vapor deposition technology as the atomic feedstock does not originate in the gaseous environment surrounding the nanotubes. The technology mitigates the problems that cease carbon nanotube growth in chemical vapor deposition growth techniques: 1) The accumulation of material on the surface of the catalyst particles, suspected to be primarily amorphous carbon, 2) The effect of Ostwald ripening that reduces the size of smaller catalyst particles and enlarges larger catalyst particles, 3) The effect of some catalyst materials diffusing into the substrate used to grow carbon nanotubes and ceasing growth when the catalyst particle becomes too small.

A method for effectively removing minute impurities of 1 μm or less in size that are present on a surface of an aluminum nitride single-crystal substrate without etching the surface includes scrubbing a surface of an aluminum nitride single-crystal substrate using a polymer compound material having lower hardness than an aluminum nitride single crystal, and an alkali aqueous solution having 0.01-1 mass % concentration of potassium hydroxide or sodium hydroxide, the alkali aqueous solution being absorbed in the polymer compound material.

In an embodiment, a method includes liberating feed atoms and forming at least one nanotube from the liberated feed atoms. Feed atoms disposed over a front side of a substrate are liberated in response to electromagnetic radiation that propagates from the back side of the substrate, through the substrate, to the front side of the substrate. And, from the liberated feed atoms, at least one nanotube is formed over the front side of the substrate in response to at least one catalyst separate from the substrate and disposed over the front side of the substrate and over the feed atoms.

In an embodiment, a method includes liberating feed atoms and forming at least one nanotube from the liberated feed atoms. Feed atoms disposed over a front side of a substrate are liberated in response to electromagnetic radiation that propagates from the back side of the substrate, through the substrate, to the front side of the substrate. And, from the liberated feed atoms, at least one nanotube is formed over the front side of the substrate in response to at least one catalyst separate from the substrate and disposed over the front side of the substrate and over the feed atoms.

The present invention relates to a method of manufacturing aluminum nitride and aluminum nitride prepared by the same. Pure aluminum powder having a median particle size (D50) of 1.52 μm was heated to a temperature in a range of 595° C.˜900° C. in a nitrogen containing atmosphere comprising nitrogen and argon gases, at atmospheric pressure for one hour to obtain aluminum nitride with a degree of nitridation exceeding 93%. According to the present invention aluminum nitride may be produced with high yield using a simple and inexpensive one-step heating method in a relatively short period of time.