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189 results on '"Matsune, Hideki"'

11. Preparation of Hydrophobic Cryogel Containing Hydroxyoxime Extractant and Its Extraction Properties of Cu(Ⅱ).

Author

Takase, Hayato, Goya, Naoto, Kiyoyama, Shiro, Shiomori, Koichiro, and Matsune, Hideki

Subjects
HYDROPHOBIC compounds, POLYMERIZATION, AQUEOUS solutions, FREEZING points, ORGANIC solvents, HYDROGELS in medicine
Abstract

Hydrophobic cryogels with monolithic supermacropores based on poly-trimethylolpropane trimethacrylate (pTrim) containing 1-(2-Hydroxyl-5-nonyphenyl)ethanone oxime (LIX84-I) were successfully prepared by a cryo-polymerization technique using organic solvents with freezing points between room temperature and around 0 °C as solvents. The prepared cryogels were characterized in terms of macroscopic shape and porous structure. The cryogels had a monolithic supermacroporous structure and high contents of LIX84-I depending on the added amount of the extractant to the monomer solution. The amount of LIX84-I impregnated in the cryogel had a linear relationship with the added amount of LIX84-I in the monomer solution for cryo-polymerization. Cu(II) in the aqueous solution was immediately adsorbed into the cryogel containing LIX84-I. [ABSTRACT FROM AUTHOR]

Published
2024
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18. Effect of polystyrene microcapsules containing CaCl2 aqueous solution on mechanical strength and curing process of Portland cement mortar.

Author

Batchuluun, Sukbakhtaar, Matsune, Hideki, Shiomori, Koichiro, Yasui, Kentaro, and Bayanjargal, Ochirkhuyag

Subjects
*MORTAR, *PORTLAND cement, *AQUEOUS solutions, *CEMENT composites, *POLYSTYRENE, *SELF-healing materials
Abstract

In order to apply microcapsules as a functional material of cement composites, such as self-healing and heat-transfer-controlling materials, the effect of the addition of microcapsules on the mechanical properties of cement mortar was investigated. Polystyrene microcapsules containing CaCl2 aqueous solution as a microencapsulation substance with monocore and multicore structures were successfully prepared from solid-in-oil-in-water (S/O/W) emulsion by the solvent evaporation method. The compressive strengths of the mortars with and without the microcapsules were measured at various curing times. The compressive strength of the mortar without microcapsules increased with curing time. The compressive strength of the mortar with the microcapsules was lower than that without microcapsules and increased with time. The decrease in the compressive strength increased with the amount of the microcapsules added in the mortar. The self-healing effect of cracked mortar by CaCl2, which would be supplied from the microcapsules due to outer mechanical force making cracks in the mortar and on the microcapsules was not clearly shown in this experiment. However, permeation and leakage of Cl− ion to the surrounding mortar from the microcapsules was observed by mapping analysis of SEM-EDX. [ABSTRACT FROM AUTHOR]

Published
2023
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41. Colloidal Trehalose Nanoparticles: Sacrifice Templates for Hollow Silica Nanospheres

Author

Matsune, Hideki, Ikemizu, Ren, Shiomori, Koichiro, Muraoka, Emi, Yamamoto, Tsuyoshi, and Kishida, Masahiro

Abstract

We demonstrate a trehalose nanoparticle (Tre NP) colloid first prepared by an injection method, and applied to a sacrifice template to create a hollow silica nanosphere. The Tre NP is successfully coated with a uniform layer of silica via sol-gel process, and removed simply by soaking in water, leading to the formation of the hollow nanostructure.Trehalose nanoparticles (Tre NPs) are first prepared with an injection method, and then successfully coated with uniform silica layers via sol-gel process. Hollow silica nanospheres (HSNs) are formed simply by soaking of the silica-coated NPs (Tre@SiO2) in water for several minutes. TEM analysis reveals the formation of HSNs with about 100–200 nm in diameter.

Published
2023
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46. Research Status of Nano-Metal Hydrogen Energy

Author

Takahashi, Akito, Kitamura, Akira, Koh Takahashi, Seto, Reiko, Matsuda, Yuki, Iwamura, Yasuhiro, Itoh, Takehiko, Jirohta Kasagi, Nakamura, Masanori, Uchimura, Masanobu, Sumitomo, Shunsuke, Takahashi, Hidekazu, Hioki, Tatsumi, Motohiro, Tomoyoshi, Furuyama, Yuichi, Kishida, Masahiro, and Matsune, Hideki

Published
2018
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