WorldCat Identities

Sugiyama, Tomoaki

Works: 4 works in 6 publications in 2 languages and 5 library holdings
Roles: Author
Classifications: DS897.T7196,
Publication Timeline
Most widely held works by Tomoaki Sugiyama
Tsukubashi by Tomoaki Sugiyama( Book )

3 editions published between 1911 and 1913 in Japanese and held by 2 WorldCat member libraries worldwide

Effects of Particle Sizes and Natural Polymers on Mechanical Properties of Alpha Tricalcium Phosphate Cements( )

1 edition published in 2016 in English and held by 1 WorldCat member library worldwide

Calcium phosphate with high specific surface area synthesized by a reverse micro-emulsion method( )

in English and held by 1 WorldCat member library worldwide

ABSTRACT: A reverse micro-emulsion method has been investigated to control crystal morphology in a nanometer region and to increase specific surface area for calcium phosphate. The nanocrystals with the control of its morphology is a candidate of drug delivery carriers. This study investigated the effects of mixing volume ratios of two surfactants, tween80 (T) and aliquate 336 (A) in kerosene as an oil phase, and pH values in the nano-region on crystalline phases and specific surface area of calcium phosphate synthesized by the reverse micro-emulsion method. A di-ammonium hydrogen phosphate solution including phosphoric acid at pH of 6.3 and a calcium nitrate solution at pH of 5.7 were adjusted, and both the solutions were separately added into the kerosene with the surfactants. Both the emulsions were then mixed at the same volume and the Ca/P ratio of 1.0, and stirred at room temperature for 24 hours. The crystalline phases were dependent on the T amounts; pure DCPD with the specific surface area of 6.7 to 12 m 2 /g was obtained at the T/A ratio of 4, the mixture of DCPD and DCPA with that of 48 to 162 m 2 /g was at the ratios of 5 to 8, and a low crystalline HAp with 163 m 2 /g was at the ratio of 9. These specific surface areas of DCPD (T/A=4) and HAp (T/A=9) were apparently higher than those prepared with a wet method, 7.8 times and 1.8 times respectively. DCPA with 43 m 2 /g was successfully produced to decrease the pH of phosphate solution at T/A of 9. The change of crystalline phases would be explained as follows; the increase of T amount decreased the micro-emulsion sizes to reduce bulk water to be DCPA, and increased the pH to precipitate HAp nanocrystals
Fabrication of 3D Graphene and 3D Graphene Oxide Devices for Sensing VOCs( )

1 edition published in 2016 in English and held by 1 WorldCat member library worldwide

ABSTRACT: Detection of volatile organic compounds (VOCs) emitted from cancerous tumor cells in exhaled human breath allows for early diagnosis of various types of cancers. 3D graphene with a large surface area is considered a suitable material for creating novel sensitive VOCs sensors. In this study, 3D graphene and 3D graphene oxide were synthesized from graphene oxide suspension, hydroquinone and formaldehyde by employing polymerization and reduction. The capability of VOC gas sensing was evaluated by measuring the electrical current response in flowing N2 gas over a range of concentrations of acetone or 1-butanol at room temperature. It was observed that the device current correlated well with the VOC concentration. The adsorption of acetone decreased the current, but the adsorption of 1-butanol increased the current during sensing. 3D graphene oxide device was more sensitive than 3D graphene device because of the high concentration of oxygen-containing functional groups on the surface. These results indicated that 3D graphene and 3D graphene oxide may be the suitable materials for VOCs sensing devices
Audience Level
Audience Level
  General Special  
Audience level: 0.86 (from 0.84 for Tsukubashi ... to 0.88 for Tsukubashi ...)

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