Masaru Ogura

Learn More
Films of vertically aligned single-walled carbon nanotubes (SWNTs) with a few μm thickness were grown by catalytic chemical vapor deposition (CVD) on quartz substrates. Low-temperature CVD from ethanol was performed by using densely mono-dispersed Co-Mo catalyst of ≈ 1.0 – 2.0 nm prepared on quartz substrates by a dip-coating method. Continuous reduction of(More)
Bimetallic catalysts (Co:Mo ≈ 2:1 in atomic ratio) were prepared on quartz substrates from metal acetate solutions using a procedure of dip coating, followed by calcination and reduction. High-purity single-walled carbon nanotubes (SWNTs) 1–2 nm in diameter were grown densely (~1.0×10 17 m-2) and vertically on these substrates during an alcohol catalytic(More)
Phase transformation of mesoporous silica during the drying process is investigated. As-synthesized hexagonal p6mm obtained under the conditions used in this study is transformed to cubic Ia3d as drying proceeds, even at room temperature. Prolonged synthesis results in the formation of a well-ordered hexagonal mesophase, with almost no phase transformation.(More)
Platinum loaded CeO(2)-ZrO(2)/SBA-15 composite material catalyzes CO oxidation at lower temperatures (<100 degrees C) than conventionally prepared Pt/CeO(2)-ZrO(2) (>150 degrees C). A sequence of reduction and reoxidation of CeO(2)- and ZrO(2)-loaded samples promotes the formation of CeO(2)-ZrO(2) solid solution on the siliceous surface as indicated by(More)
We have succeeded in direct synthesis of single-walled carbon nanotubes (SWNTs) on a conductive substrate coated with a 3D mesoporous silica film, and observed the field emission. Co catalysts for the growth of SWNTs are deposited on the substrate by electroplating. The particle size of the catalyst is well controlled inside defined space of the mesoporous(More)
Methylated nitrogen-substituted microporous and mesoporous silica exhibited almost the same catalytic performance as that of a conventional homogeneous base catalyst. They also demonstrated unexpectedly high product selectivity for the Morita-Baylis-Hillman reaction of formaldehyde with methyl acrylate at high temperatures.
Vertically oriented single-walled carbon nanotubes (SWNTs) attract considerable attention, because it is expected as an ideal field emitter that can realize lower threshold voltage and higher electric current than microtips of Si or metals. In this study, we aim that SWNTs are vertically oriented using mesoporous silica film as a guide of the growth for(More)
The structure of amorphous precursor species formed under hydrothermal conditions, prior to the onset of crystallization of microporous aluminosilicate zeolites, is determined employing high-energy X-ray diffraction (HEXRD). The investigation, combined with the use of reverse Monte Carlo modelling suggests that even numbered rings, especially 4R (R: ring)(More)