The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Tetsuya Uda - One of the best experts on this subject based on the ideXlab platform.
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multi step hydration dehydration mechanisms of rhombohedral y2 so4 3 a Candidate Material for low temperature thermochemical heat storage
RSC Advances, 2020Co-Authors: Kunihiko Shizume, Naoyuki Hatada, Shoko Yasui, Tetsuya UdaAbstract:To evaluate rhombohedral Y2(SO4)3 as a new potential Material for low-temperature thermochemical energy storage, its thermal behavior, phase changes, and hydration/dehydration reaction mechanisms are investigated. Rhombohedral Y2(SO4)3 exhibits reversible hydration/dehydration below 130 °C with relatively small thermal hysteresis (less than 50 °C). The reactions proceed via two reaction steps in approximately 0.02 atm of water vapor pressure, i.e. “high-temperature reaction” at 80–130 °C and “low-temperature reaction” at 30–100 °C. The high-temperature reaction proceeds by water insertion into the rhombohedral Y2(SO4)3 host structure to form rhombohedral Y2(SO4)3·xH2O (x = ∼1). For the low-temperature reaction, rhombohedral Y2(SO4)3·xH2O accommodates additional water molecules (x > 1) and is eventually hydrated to Y2(SO4)3·8H2O (monoclinic) with changes in the host structure. At a water vapor pressure above 0.08 atm, intermediate Y2(SO4)3·3H2O appears. A phase stability diagram of the hydrates is constructed and the potential usage of Y2(SO4)3 for thermal energy upgrades is assessed. The high-temperature reaction may act similarly to an existing Candidate, CaSO4·0.5H2O, in terms of reaction temperature and water vapor pressure. Additionally, the hydration of rhombohedral Y2(SO4)3·xH2O to Y2(SO4)3·3H2O should exhibit a larger heat storage capacity. With respect to the reaction kinetics, the initial dehydration of Y2(SO4)3·8H2O to rhombohedral Y2(SO4)3 introduces a microstructure with pores on the micron order, which might enhance the reaction rate.
Kunihiko Shizume - One of the best experts on this subject based on the ideXlab platform.
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multi step hydration dehydration mechanisms of rhombohedral y2 so4 3 a Candidate Material for low temperature thermochemical heat storage
RSC Advances, 2020Co-Authors: Kunihiko Shizume, Naoyuki Hatada, Shoko Yasui, Tetsuya UdaAbstract:To evaluate rhombohedral Y2(SO4)3 as a new potential Material for low-temperature thermochemical energy storage, its thermal behavior, phase changes, and hydration/dehydration reaction mechanisms are investigated. Rhombohedral Y2(SO4)3 exhibits reversible hydration/dehydration below 130 °C with relatively small thermal hysteresis (less than 50 °C). The reactions proceed via two reaction steps in approximately 0.02 atm of water vapor pressure, i.e. “high-temperature reaction” at 80–130 °C and “low-temperature reaction” at 30–100 °C. The high-temperature reaction proceeds by water insertion into the rhombohedral Y2(SO4)3 host structure to form rhombohedral Y2(SO4)3·xH2O (x = ∼1). For the low-temperature reaction, rhombohedral Y2(SO4)3·xH2O accommodates additional water molecules (x > 1) and is eventually hydrated to Y2(SO4)3·8H2O (monoclinic) with changes in the host structure. At a water vapor pressure above 0.08 atm, intermediate Y2(SO4)3·3H2O appears. A phase stability diagram of the hydrates is constructed and the potential usage of Y2(SO4)3 for thermal energy upgrades is assessed. The high-temperature reaction may act similarly to an existing Candidate, CaSO4·0.5H2O, in terms of reaction temperature and water vapor pressure. Additionally, the hydration of rhombohedral Y2(SO4)3·xH2O to Y2(SO4)3·3H2O should exhibit a larger heat storage capacity. With respect to the reaction kinetics, the initial dehydration of Y2(SO4)3·8H2O to rhombohedral Y2(SO4)3 introduces a microstructure with pores on the micron order, which might enhance the reaction rate.
Terence G Langdon - One of the best experts on this subject based on the ideXlab platform.
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tribology testing of ultrafine grained ti processed by high pressure torsion with subsequent coating
Journal of Materials Science, 2013Co-Authors: Chuan Ting Wang, R J K Wood, Terence G LangdonAbstract:A grade 2 pure Ti was processed by high-pressure torsion (HPT) under 3.0 GPa for 10 revolutions to achieve an improved strength. Wear tests revealed that HPT only slightly improved the wear resistance of pure Ti. Subsequently, a TiN coating with a thickness of 2.5 μm was deposited on different Ti substrates to improve the wear resistance. Both indentation and scratch testing demonstrated a much improved load-bearing capacity when ultrafine-grained Ti was chosen as the substrate compared with coarse-grained Ti. All results indicate that pure Ti processed by HPT, when combined with a subsequent coating, represents a good Candidate Material for bio-implant applications.
Naoyuki Hatada - One of the best experts on this subject based on the ideXlab platform.
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multi step hydration dehydration mechanisms of rhombohedral y2 so4 3 a Candidate Material for low temperature thermochemical heat storage
RSC Advances, 2020Co-Authors: Kunihiko Shizume, Naoyuki Hatada, Shoko Yasui, Tetsuya UdaAbstract:To evaluate rhombohedral Y2(SO4)3 as a new potential Material for low-temperature thermochemical energy storage, its thermal behavior, phase changes, and hydration/dehydration reaction mechanisms are investigated. Rhombohedral Y2(SO4)3 exhibits reversible hydration/dehydration below 130 °C with relatively small thermal hysteresis (less than 50 °C). The reactions proceed via two reaction steps in approximately 0.02 atm of water vapor pressure, i.e. “high-temperature reaction” at 80–130 °C and “low-temperature reaction” at 30–100 °C. The high-temperature reaction proceeds by water insertion into the rhombohedral Y2(SO4)3 host structure to form rhombohedral Y2(SO4)3·xH2O (x = ∼1). For the low-temperature reaction, rhombohedral Y2(SO4)3·xH2O accommodates additional water molecules (x > 1) and is eventually hydrated to Y2(SO4)3·8H2O (monoclinic) with changes in the host structure. At a water vapor pressure above 0.08 atm, intermediate Y2(SO4)3·3H2O appears. A phase stability diagram of the hydrates is constructed and the potential usage of Y2(SO4)3 for thermal energy upgrades is assessed. The high-temperature reaction may act similarly to an existing Candidate, CaSO4·0.5H2O, in terms of reaction temperature and water vapor pressure. Additionally, the hydration of rhombohedral Y2(SO4)3·xH2O to Y2(SO4)3·3H2O should exhibit a larger heat storage capacity. With respect to the reaction kinetics, the initial dehydration of Y2(SO4)3·8H2O to rhombohedral Y2(SO4)3 introduces a microstructure with pores on the micron order, which might enhance the reaction rate.
Shoko Yasui - One of the best experts on this subject based on the ideXlab platform.
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multi step hydration dehydration mechanisms of rhombohedral y2 so4 3 a Candidate Material for low temperature thermochemical heat storage
RSC Advances, 2020Co-Authors: Kunihiko Shizume, Naoyuki Hatada, Shoko Yasui, Tetsuya UdaAbstract:To evaluate rhombohedral Y2(SO4)3 as a new potential Material for low-temperature thermochemical energy storage, its thermal behavior, phase changes, and hydration/dehydration reaction mechanisms are investigated. Rhombohedral Y2(SO4)3 exhibits reversible hydration/dehydration below 130 °C with relatively small thermal hysteresis (less than 50 °C). The reactions proceed via two reaction steps in approximately 0.02 atm of water vapor pressure, i.e. “high-temperature reaction” at 80–130 °C and “low-temperature reaction” at 30–100 °C. The high-temperature reaction proceeds by water insertion into the rhombohedral Y2(SO4)3 host structure to form rhombohedral Y2(SO4)3·xH2O (x = ∼1). For the low-temperature reaction, rhombohedral Y2(SO4)3·xH2O accommodates additional water molecules (x > 1) and is eventually hydrated to Y2(SO4)3·8H2O (monoclinic) with changes in the host structure. At a water vapor pressure above 0.08 atm, intermediate Y2(SO4)3·3H2O appears. A phase stability diagram of the hydrates is constructed and the potential usage of Y2(SO4)3 for thermal energy upgrades is assessed. The high-temperature reaction may act similarly to an existing Candidate, CaSO4·0.5H2O, in terms of reaction temperature and water vapor pressure. Additionally, the hydration of rhombohedral Y2(SO4)3·xH2O to Y2(SO4)3·3H2O should exhibit a larger heat storage capacity. With respect to the reaction kinetics, the initial dehydration of Y2(SO4)3·8H2O to rhombohedral Y2(SO4)3 introduces a microstructure with pores on the micron order, which might enhance the reaction rate.
