Faculty Profiles - KOBAYASHI Makoto

Papers - KOBAYASHI Makoto

Division display 141 - 149 of about 149 ／ All the affair displays >>

Microwave-assisted hydrothermal synthesis of brookite nanoparticles from a water-soluble titanium complex and their photocatalytic activity Reviewed International journal Open Access

Yusuke Morishinia, Makoto Kobayashi, Valery Petrykin, Masato Kakihana, Koji Tomita

Journal of the Ceramic Society of Japan Vol. 115 ( 1348 ) page： 826 - 830 2007.12

Language：English Publishing type：Research paper (scientific journal) Publisher：CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI

Nanoparticles of brookite titanium oxide were prepared by microwave-assisted hydrothermal (MH) method at 200 degrees C (heating time 5 min) for 0-60 minutes starting from the titanium peroxo glycolate complex in basic solution. The effect of microwave heating on the morphology of the brookite particles was examined. The samples were characterized by X-ray diffraction (XRD), Raman spectroscopy and transmission electron microscopy (TEM). It was found that all powders were composed of single phase brookite and contained two different types of particles. The activity in photodecomposition of oxalic acid by the samples prepared using MH method was higher than activities of brookite nanoparticles synthesized by the conventional hydrothermal method.

DOI： 10.2109/jcersj2.115.826

Web of Science

researchmap

Morphology control of rutile nanoparticles in a hydrothermal synthesis from water-soluble titanium complex aqueous solution Reviewed International journal Open Access

Makoto Kobayashi, Valery Petrykin, Masato Kakihana, Koji Tomita

Journal of the Ceramic Society of Japan Vol. 115 ( 1348 ) page： 835 - 839 2007.12

Language：English Publishing type：Research paper (scientific journal) Publisher：CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI

Single phase rutile was synthesized by a simple hydrothermal treatment of an aqueous titanium glycolate complex solution at 200 degrees C for 24 h. The obtained sample was composed of 50 x 150 nm rod-like nanoparticles. The aspect ratio of the prepared particles could be controlled by adding glycolic acid or lactic acid to reaction solution. Up to 30 x 2000 nm whisker-like particles could be obtained. The hydroxycarboxylic acids favor development of specific crystal facets and allow to control the aspect ratio of the rutile nanoparticles. We also proposed a model, which explains formation of anatase and rutile, and disappearance of anatase particles during rutile crystals development.

DOI： 10.2109/jcersj2.115.835

Web of Science

researchmap

One-step synthesis of TiO2(B) nanoparticles from a 'Water-Soluble titanium complex Reviewed International journal

Kobayashi, Makoto, Petrykin, Valery V., Kakihana, Masato

Chemistry of Materials Vol. 19 ( 22 ) page： 5373-5376 - 5376 2007.10

ゾル－ゲルコーティング材料としての新規水溶性チタン錯体 Invited Reviewed

垣花眞人, 冨田恒之, 小林亮

化学工業 Vol. 57 ( 12 ) page： 13-19 2006.12

Hydrothermal synthesis of nanosized titania photocatalysts using novel water-soluble titanium complexes Reviewed International journal

Makoto Kobayashi, Koji Tomita, Valery Petrykin, Syu Yin, Tsugio Sato, Masahiro Yoshimura, Masato Kakihana

Solid State Phenomena Vol. 124-126 page： 723-726 2006.9

A water-soluble titanium complex for the selective synthesis of nanocrystalline brookite, rutile, and anatase by a hydrothermal method. Reviewed International journal

Koji Tomita, Valery Petrykin, Makoto Kobayashi, Motoo Shiro, Masahiro Yoshimura, Masato Kakihana

Angewandte Chemie (International ed. in English) Vol. 45 ( 15 ) page： 2378 - 81 2006.4

水溶液から酸化チタンを作る Invited Reviewed

小林亮, 冨田恒之, 垣花眞人

色材協会コラム ( 20 ) page： 1 2006

The Owakidani Tephra Group : A Newly Discovered Post-magmatic Eruption Product of Hakone Volcano, Japan Reviewed Open Access

KOBAYASHI Makoto, MANNEN Kazutaka, OKUNO Mitsuru, NAKAMURA Toshio, HAKAMATA Kazuo

BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN Vol. 51 ( 4 ) page： 245 - 256 2006

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Volcanological Society of Japan

We discovered a set of phreatic explosion deposits, herein referred to as the Owakidani tephra group, on the northern slope of Mt. Kamiyama and in the Owakidani fumarolic area of the Hakone Volcano. The tephra group is the product of the volcanic activities since the latest magmatic eruption of Hakone Volcano at around 2.9ka. It comprises five units named Hk-Ow1 to Hk-Ow5 in the ascending order. Both Hk-Ow1 and Hk-Ow2 comprise tephra fall deposits and secondary debris flow deposits. In addition to these deposits, Hk-Ow2 is also associated with surge deposits. Hk-Ow3, Hk-Ow4 and Hk-Ow5 consist of tephra fall deposits. The ash of these tephra fall deposits and the matrix of the secondary debris flows are principally composed of clay, altered lithics and secondary minerals supposed to be of fumarolic area origin. It is possible that Hk-Ow1 and Hk-Ow2 erupted from a fissure on the northeastern ridge of Mt. Kamiyama, while Hk-Ow3, Hk-Ow4 and Hk-Ow5 erupted at Owakidani. No juvenile material was found within the deposits of these eruptions except for Hk-Ow2, while the surge deposit of Hk-Ow2 contained trace amounts of volcanic glass fragment. Although it is considered that the principal nature of the eruptions of the Owakidani tephra group is phreatic, the deformation of the edifice around the source area implies the possibility of magma intrusion to shallow levels. Based on the calendar ages of the Owakidani tephra group and the stratigraphic position of the Kozushima-Tenjosan tephra, we estimated that Hk-Ow3, Hk-Ow4 and Hk-Ow5 erupted in relatively short intervals between the latter half of the 12th and 13th centuries. On the other hand, Hk-Ow1 and Hk-Ow2 erupted at around 3 kyr BP and 2kyr BP, respectively. The eruption ages of the Owakidani tephra group generally correspond to the seismic events that occurred in the Kozu-Matsuda Faults and the Tanna-Hirayama tectonic line. It is suggested that the activity of the Hakone Volcano may be closely related to the tectonic events in this region.

DOI： 10.18940/kazan.51.4_245

Open Access

CiNii Research

水溶性プロセスを利用したセラミックスの合成 Invited Reviewed

冨田恒之, 小林亮, 垣花眞人

未来材料 Vol. 5 ( 10 ) page： 37 - 43 2005.10

　 PREV - NEXT 　

<KOBAYASHI Makoto>

Papers - KOBAYASHI Makoto