Abstract: Provided is an aggregate of carbon nanotubes wherein a mixture of 10 mg of aggregate of carbon nanotubes, 30 mg of sodium polystyrene sulfonate and 10 mL of water is subjected to ultrasonic homogenizer treatment, subsequently subjected to centrifugal treatment at 20000 G, then 9 mL of supernatant is sampled, and the content of aggregate of carbon nanotubes in the supernatant is 0.6 mg/mL or more. The aggregate of carbon nanotubes of the present invention can provide a dispersion of an aggregate of carbon nanotubes having a high concentration through very good dispersibility.

Abstract: Provided is an aggregate of carbon nanotubes satisfying (1) there is a 2? peak at 24°±2° by X-ray powder diffraction analysis; (2) a height ratio (G/D ratio) of G band to D band by Raman spectroscopic analysis of wavelength 532 nm is 30 or more; and (3) a combustion peak temperature is from 550° C. to 700° C. The present invention provides an aggregate of carbon nanotubes excellent in dispersibility while high quality, giving a film, molded article, membrane or the like having excellent characteristics.

Abstract: An atmosphere of a carbon source comprising an oxygenic compound is brought into contact with a catalyst with heating to yield single-walled carbon nanotubes. The carbon source comprising an oxygenic compound preferably is an alcohol and/or ether. The catalyst preferably is a metal. The heating temperature is preferably 500 to 1,500° C. The single-walled carbon nanotubes thus obtained contain no foreign substances and have satisfactory quality with few defects.

Abstract: An optical hydrogen gas detecting membrane is prepared by sequentially depositing a platinum oxide layer and a catalytic metal layer on a transparent substrate, such as quartz glass, by vapor deposition such as the sputtering method. Palladium or platinum is used as the catalytic metal layer.

Abstract: An atmosphere of a carbon source comprising an oxygenic compound is brought into contact with a catalyst with heating to yield single-walled carbon nanotubes. The carbon source comprising an oxygenic compound preferably is an alcohol and/or ether. The catalyst preferably is a metal. The heating temperature is preferably 500 to 1,500° C. The single-walled carbon nanotubes thus obtained contain no foreign substances and have satisfactory quality with few defects.

Abstract: An atmosphere of a carbon source comprising an oxygenic compound is brought into contact with a catalyst with heating to yield single-walled carbon nanotubes. The carbon source comprising an oxygenic compound preferably is an alcohol and/or ether. The catalyst preferably is a metal. The heating temperature is preferably 500 to 1,500° C. The single-walled carbon nanotubes thus yield contain no foreign substances and have satisfactory quality with few defects.

Abstract: A sensing element for cyclic saturated hydrocarbons, which can optically detect in a short time the volatilized organic hydride at comparatively low sensing element temperature, and a detector which uses the sensing element are disclosed. The sensing element for cyclic saturated hydrocarbons has a transparent substrate made of ceramics such as quartz; a tungsten trioxide thin film having columnar structure on the transparent substrate, and a platinum layer formed to the thickness of 15 nm or less on the surface of the thin film by deposition.

Abstract: A hydrogen gas detecting material, which changes in light absorption characteristics when exposed to an atmosphere containing hydrogen, and the coating method are characterized in that (1) the principal component of the hydrogen gas detecting material is tungsten oxide, (2) palladium is deposited on the surface of the tungsten oxide, (3) the tungsten oxide is coated on a substrate by a sputtering method involving a controlled oxygen pressure, and (4) the temperature of the substrate during coating with the tungsten oxide is room temperature (20° C.).

Abstract: Provided is an aggregate of carbon nanotubes wherein a mixture of 10 mg of aggregate of carbon nanotubes, 30 mg of sodium polystyrene sulfonate and 10 mL of water is subjected to ultrasonic homogenizer treatment, subsequently subjected to centrifugal treatment at 20000 G, then 9 mL of supernatant is sampled, and the content of aggregate of carbon nanotubes in the supernatant is 0.6 mg/mL or more. The aggregate of carbon nanotubes of the present invention can provide a dispersion of an aggregate of carbon nanotubes having a high concentration through very good dispersibility.

Abstract: A method for producing a conductive composite includes coating a composition (B) containing a dispersing agent (A) having a hydroxyl group in the molecule and a conductive material on a substrate, and coating a liquid containing a compound (C) represented by the formula (I) below and/or a hydrolysate of the compound (C) on a surface coated with the composition (B): (R1)mMXn-m ??(1).

Abstract: A method for preparing hollow nanofibers having carbon as a primary component by contacting a carbon-containing compound with a catalyst at 500 to 1200° C., wherein the catalyst is one of a zeolite exhibiting thermal resistance at 900° C. and, supported thereon, a metal; a metallosilicate zeolite containing a heteroatom except aluminum and silicon and a metal; a supporting material and fine cobalt particles exhibiting a binding energy of a cobalt 2P3/2 electron of 779.3 to 781.0 eV; a supporting material and fine cobalt particles exhibiting a cobalt atom ratio in the surface of the supporting material of 0.1 to 1.5%, as measured by the X-ray photoelectron spectroscopy at 10 kV and 18 mA; a supporting material and fine cobalt particles exhibiting a weight ratio of cobalt to a second metal component of 2.5 or more; and a zeolite having a film form and a metal.

Abstract: A method of enhancing ocular penetration of a drug in an eyedrop by administering to an eye, an eyedrop containing, particulate agar having a weight-average molecular weight of from 5,000 to 1,200,000, the particulate agar being obtained by dissolving agar into an aqueous solution by heating and then cooling the resultant mixture to avoid gelling, while applying a stress by vibration, shearing, stirring, compression or pulverizing, wherein the particulate agar is in an amount of 0.1 to 10 wt %.

Abstract: A method of manufacturing porous ceramics, for example, thin film used for gas separation is disclosed. In this method, a silicon based mixture polymeric material which is the ceramics precursor is applied on a ceramics substrate, crosslinked by using ionizing radiation under oxygen free conditions; and pyrolyzed under an inert gas after that.

Abstract: A method of synthesizing SiC materials comprising the step of making a blend which consists of a silicon based polymer and a metal complex by blending a silicon based polymer solution and a metal complex solution and drying, and firing the blend in an inert gas at 700° C. or more; and a SiC ceramic material which has catalyst performance in which a CO gas is oxidized to generate a CO2 gas, made by blending a polycarbosilane solution and a palladium acetate solution, and firing the blend in an inert gas at 700° C. or more after drying.

Abstract: A method by which ceramic nanowires with diameters ranging from several to several tens of nanometers can be synthesized with improvements in the shape retention of the nanowires and the yield of conversion to ceramic, which method comprises the steps of forming a thin film of a silicon-containing polymer usable as a ceramic precursor, irradiating the thin film with ion beams to form cylindrical crosslinked portions, extracting the un-crosslinked portions with a solvent to produce nanowires of the silicon-containing polymer, irradiating the nanowires with an ionizing radiation so that they are crosslinked again, and firing the re-crosslinked nanowires.

Abstract: A method by which ceramic nanowires with diameters ranging from several to several tens of nanometers can be synthesized with improvements in the shape retention of the nanowires and the yield of conversion to ceramic, which method comprises the steps of forming a thin film of a silicon-containing polymer usable as a ceramic precursor, irradiating the thin film with ion beams to form cylindrical crosslinked portions, extracting the un-crosslinked portions with a solvent to produce nanowires of the silicon-containing polymer, irradiating the nanowires with an ionizing radiation so that they are crosslinked again, and firing the re-crosslinked nanowires.

Abstract: Provided is a method for producing a carbon nanotube, wherein a catalyst for carbon nanotube production comprising a powdery catalyst supporting a metal on magnesia and having a bulk density of 0.30 g/mL to 0.70 g/mL, in a vertical reactor, is disposed over the whole area in a horizontal cross section direction of the reactor, in such state a carbon-containing compound flowed in a vertical direction inside the reactor is contacted with the catalyst at 500 to 1200° C., thereby carbon nanotubes of uniformity and high quality are efficiently synthesized in a large amount.

Abstract: A hydrogen gas detecting material, which changes in light absorption characteristics when exposed to an atmosphere containing hydrogen, and the coating method are characterized in that (1) the principal component of the hydrogen gas detecting material is tungsten oxide, (2) palladium is deposited on the surface of the tungsten oxide, (3) the tungsten oxide is coated on a substrate by a sputtering method involving a controlled oxygen pressure, and (4) the temperature of the substrate during coating with the tungsten oxide is room temperature (20° C.).

Abstract: Provided is a method for producing a carbon nanotube, wherein a catalyst for carbon nanotube production comprising a powdery catalyst supporting a metal on magnesia and having a bulk density of 0.30 g/mL to 0.70 g/mL, in a vertical reactor, is disposed over the whole area in a horizontal cross section direction of the reactor, in such state a carbon-containing compound flowed in a vertical direction inside the reactor is contacted with the catalyst at 500 to 1200° C., thereby carbon nanotubes of uniformity and high quality are efficiently synthesized in a large amount.

Abstract: Provided is an aggregate of carbon nanotubes satisfying (1) there is a 2? peak at 24°±2° by X-ray powder diffraction analysis; (2) a height ratio (G/D ratio) of G band to D band by Raman spectroscopic analysis of wavelength 532 nm is 30 or more; and (3) a combustion peak temperature is 550° C. or more, and 700° C. or less.