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Rintaro Ashihara, Masami Kawahara, Hiroyuki Okazaki, Shunya Yamamoto, ...
Article ID: 24021
Published: 2024
Advance online publication: May 03, 2024
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Zannatul Mumtarin Moushumy, Haruka Oyama, Hiroshi Yoshida, Masato Mach ...
Article ID: 24022
Published: 2024
Advance online publication: May 02, 2024
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Su-Hyun Baek, Toshihiro Isobe, Miki Inada
Article ID: 24033
Published: 2024
Advance online publication: May 02, 2024
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Kazuaki Hashimoto, Mototsune Fukuchi, Hirobumi Shibata
Article ID: 24017
Published: 2024
Advance online publication: April 03, 2024
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Carboxymethylcellulose with ammonium functional groups (CMC-NH4), acting as a thickener, was included in the preparation of porous beta-tricalcium phosphate (β-TCP) based on foaming via physical agitation. The physical properties of the resulting porous products were evaluated. The viscosities of the slurry and resulting foam were increased markedly as the amount of added CMC-NH4 was increased. A polyoxyethylene alkyl ether surfactant was also found to significantly promote foaming, although the foam became less stable over time. The incorporation of CMC-NH4 increased foam stability even though an excess of this agent gave an overly high viscosity that inhibited foaming. Sintered porous β-TCP generated in this study was a single-phase material with no by-products. Cross-sectional scanning electron microscopy images of the porous β-TCP showed that the pore size and distribution were changed as the proportion of CMC-NH4 was increased. The addition of 1.0 g of this agent to 30 g β-TCP gave a material containing primarily macro-sized pores with a porosity of approximately 80 % and compressive strength on the order of 2 MPa. Both micro-sized pores (0.2–0.6 µm with an average of 0.32 µm) and macro-sized pores (10–200 µm with an average of 80 µm) were found to be connected in the specimens. Controlling the slurry viscosity was determined to be important because this variable affected the pore size and size distribution.
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Tetsuo Uchikoshi
Article ID: 24023
Published: 2024
Advance online publication: May 01, 2024
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Koichiro Fukuda, Ryoji Watanabe, Hiroshi Nakamori, Daisuke Urushihara, ...
Article ID: 24027
Published: 2024
Advance online publication: April 26, 2024
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Gota Asano, Tetsuo Umegaki, Yoshiyuki Kojima
Article ID: 24009
Published: 2024
Advance online publication: April 24, 2024
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Koichiro Fukuda, Fumiya Nakajima, Daisuke Urushihara, Toru Asaka, Tohr ...
Article ID: 24026
Published: 2024
Advance online publication: April 24, 2024
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Yuki Nakashima, Kiyoshi Hirao, You Zhou, Tatsuki Ohji, Norimitsu Muray ...
Article ID: 24005
Published: 2024
Advance online publication: March 28, 2024
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Dielectric breakdown strength (DBS) of silicon nitride substrates with thicknesses of 0.25, 0.15, and 0.07 mm was measured by four types of electrodes: 10 mm spherical, 6 mm circular column shape, and 10- and 15-mm gold-coated film. In addition, the DBS was determined by a McKewon electrode in which the gap between the above spherical electrode and substrate was filled with epoxy resin. The DBS increased with decreases in the electrode diameter and the substrate thickness owing to the decreased number of defects within the measurement volume. The DBS measured by the McKewon electrode was the highest because the epoxy resin prevents electrical discharge under high voltages. However, the thickness-independent, intrinsic DBS, which was estimated from the results obtained by the McKewon electrode, was still significantly low compared to the theoretical DBS, indicating that various internal defects such as pores and boundary phases lower the DBS.
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Yuta Hayashibara, Yudai Yokochi, Yoshihiro Takahashi, Nobuaki Terakado ...
Article ID: 24008
Published: 2024
Advance online publication: March 18, 2024
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Basically, nonconventional aluminate glass is hardly prepared by melt-quenching technique. In this study, we could obtain the 15Li2O–55SrO–30Al2O3 glass through melt-quenching, and suggested the Li2O–SrO–Al2O3 system as new glass-forming system. The studied glass was demonstrated to have a similar structure to binary SrO–Al2O3 glasses so far. In addition, we found a restrictive glass-forming region in the Li2O–SrO–Al2O3 system. Furthermore, we observed the photoluminescent (PL) and PL excitation spectra, which were attributed to f–f transitions, in the resulting glass-ceramics (GCs) doped with Eu3+, suggesting that the GCs in Li2O–SrO–Al2O3 system have a potential for phosphor host material.
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Biao Zhang, Yichen Wu, Zhiwei Jin, Hongjun Ning, Fen Wang, Hongjie Luo ...
Article ID: 24010
Published: 2024
Advance online publication: April 13, 2024
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Hidenobu Murata, Atsushi Nakahira
Article ID: 24014
Published: 2024
Advance online publication: April 12, 2024
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