研究者詳細 - 本塚　智

論文 - 本塚　智

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Effect of lubricant milling aids on the recrystallization behavior and magnetic properties of ball-milled iron powders having (0 0 1) fiber texture for soft magnetic composite 査読有り

Motozuka S., Mako Y., Sato H., Hojo H., Okazaki Y.

Journal of Magnetism and Magnetic Materials 2020年01月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

© 2020 Elsevier B.V. In ball-milled iron particles for soft magnetic composites (SMCs), milling aids with lubricity can induce a (0 0 1) fiber texture with superior magnetic properties. Effects of lubricants on the recrystallization behavior of ball-milled iron particles with fiber texture and their magnetic properties of SMCs using the iron particles were investigated. During ball milling, lubricant oil and boron nitride (a solid lubrication particle) were used as lubricants. Both as-milled iron particles have a (0 0 1) fiber texture. However, when these iron particles are recrystallized using heat treatment, the iron particles milled using the lubricant oil almost disappeared while the fiber texture in the particles milled using the boron nitride was strongly retained. Therefore, it is concluded that ball milling for iron particles using boron nitride lubricant can retain (0 0 1) fiber texture in heat-treated iron particles, and SMC using these iron particles have higher permeability and lower coercive force.

DOI： 10.1016/j.jmmm.2020.167548

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Enhancement effect on antibacterial property of gray titania coating by plasma-sprayed hydroxyapatite-amino acid complexes during irradiation with visible light 査読有り

Morakul S., Otsuka Y., Ohnuma K., Tagaya M., Motozuka S., Miyashita Y., Mutoh Y.

Heliyon 5 ( 8 ) 2019年08月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2019 The Author(s) The aim of this study was to reveal the mechanism of enhancement of antibacterial properties of gray titania by plasma-sprayed hydroxyapatite (HAp)–amino acid fluorescent complexes under irradiation with visible light. Although visible-light–sensitive photocatalysts are applied safely to oral cavities, their efficacy is not high because of the low energy of irradiating light. This study proposed a composite coating containing HAp and gray titania. HAp itself functioned as bacteria catchers and gray titania released antibacterial radicals by visible-light irradiation. HAp-amino acid fluorescent complexes were formed on the surface of the composite coating in order to increase light intensity to gray titania by fluorescence, based on an idea bioinspired by deep-sea fluorescent coral reefs. A cytotoxicity assay on murine osteoblastlike cells revealed that biocompatibility of the HAp–amino acid fluorescent complexes was identical with the that of HAp. Antibacterial assays involving Escherichia coli showed that the three types of HAp–amino acid fluorescent complexes and irradiation with three types of light-emitting diodes (blue, green, and red) significantly decreased colony-forming units. Furthermore, kelvin probe force microscopy revealed that the HAp–amino acid fluorescent complexes preserved the surface potentials even after irradiation with visible light, whereas those of HAp were significantly decreased by the irradiation. Such a preservative effect of the HAp–amino acid fluorescent complexes maintained the bacterial-adhesion performance of HAp and consequently enhanced the antibacterial action of gray titania.

DOI： 10.1016/j.heliyon.2019.e02207

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Formation of (001) fiber texture in iron powder and its effect on magnetic properties and crystal orientation of the powder compact 査読有り

Motozuka S., Iwai S., Sato H., Hojo H., Okazaki Y., Morinaga M.

ISIJ International 59 192 - 200 2019年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2019 ISIJ. Soft magnetic powder compacts can suppress eddy current loss compared to conventional laminated cores. However, the compacts accompany greater hysteresis losses because the easy magnetization axes are not controlled in powders. In this study, a novel soft magnetic compact was prepared from a platelet-shaped iron powder with well-controlled easy magnetization axes and its effects on magnetic properties and crystal orientation of the compact were investigated. Such platelet iron powder was produced using a ball-milling process. During milling, the iron powder was subjected to the deformation, resulting in the shape change to the platelet. Simultaneously, a (001) fiber texture was formed preferentially, as it is characteristic of the deformed bcc metal. The powder was then compacted into a toroidal shape. The platelet surface of the powder was oriented so as to become parallel to the toroidal direction. Consequently, the easy magnetization axis, which lies along the platelet surface, was also oriented to the toroidal direction. The toroidal compact prepared in this way exhibited excellent magnetic properties. For example, the permeability was approximately 2.4 times higher than that of the compact prepared from a conventional iron powder.

DOI： 10.2355/isijinternational.ISIJINT-2018-521

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Effects of compression on orientation of ligands in fluorescent complexes between hydroxyapatite with amino acids and their optical properties 査読有り

Morakul S., Otsuka Y., Nararya A., Tagaya M., Motozuka S., Ohnuma K., Miyashita Y., Mutoh Y.

Journal of the Mechanical Behavior of Biomedical Materials 88 406 - 414 2018年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2018 Elsevier Ltd This study aims to reveal the effects of pressure during cold isostatic pressing (CIP) on the microstructure and optical properties of fluorescent HAp complexes. Although the microsturucture-dependent properties of fluorescent HAp complexes have been reported to improve the antibacterial properties of photocatalyst coating layers, the mechanism behind the changes in the fluorescence properties of highly compressed HAp complexes has not yet been unveiled. CIP was successfully used to fabricate fluorescent HAp – amino acid complexes, and their fluorescence intensities increased with increasing fabrication pressure. Peak wavelength of fluorescence emitted by the HAp – amino acid complexes exhibited yellow to red shift. Although the thickness of the amino acid layer was saturated in higher pressure cases, the concentration of amino acids increased proportionally with pressure, which suggests changes in the packing structures of the ligands in the HAp– amino acid complexes. Polarized Raman spectroscopy measurements clearly detected ligands normally arranged to the HAp layer under high pressure fabrication conditions, which can provide the tightly packed ligand structure in the HAp– amino acid complexes. These tightly packed ligand structure in the HAp– amino acid complexes could emit stronger fluorescence owing to the increased density of complexations. This newly found pressure dependency in the optical properties of HAp–amino acid complexes is beneficial for developing biocompatible fluorescence materials or enhancement agents for antibacterial coating layers.

DOI： 10.1016/j.jmbbm.2018.09.006

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Visible light-induced antibacterial effects of the luminescent complex of hydroxyapatite and 8-hydroxyquinoline with gray titania coating 査読有り

Matsuya T., Morakul S., Otsuka Y., Ohnuma K., Tagaya M., Motozuka S., Miyashita Y., Mutoh Y.

Applied Surface Science 448 529 - 538 2018年08月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2018 Elsevier B.V. The aim of this study is to observe visible light-induced antibacterial effects of the luminescent complex of hydroxyapatite and 8-hydroxyquinoline with gray titania coating. Plasma-sprayed Hydroxyapatite (HAp) coating has been widely used as bonding between alveolar bones with dental implants. However, bacterial infection on the surfaces of dental implants has recently been reported and conventional antibacterial technologies cannot last long-term use. Therefore a novel technology using the complex of hydroxyapatite and 8-hydroxyquinoline (8-Hq) with gray titania was proposed, which can be activated by visible light. Ti 2 O 3 powder was used in a plasma-spraying process to fabricate visible-light-sensitive titania coating. The plasma-sprayed HAp/Ti 2 O 3 was characterized by Raman Spectroscopy, FTIR and XRD. Its photo catalytic activity was evaluated using chemiluminescence observation and antibacterial property was evaluated by optical density measurement (OD), colony forming unit (CFUs) and fluorescent microscope observation. The plasma-sprayed Ti 2 O 3 powder revealed that its phase changed to TiO 2 (Rutile) though the color of the plasma-sprayed Ti 2 O 3 powder kept dark gray, which possessed its absorbency in visible-light region. The plasma-sprayed Ti 2 O 3 powder was then called gray titania and 1O 2 was generated from the gray titania by irradiating three types of laser (blue, green and red). Antibacterial evaluation revealed that both the existence of the complex and the irradiation of LEDs could significantly decrease the numbers of colony forming unit (CFUs). Furthermore, HAp-8Hq complex decreased adhesion of E. coli even without light irradiation. An enhancement in the antibacterial property of HAp complexes with gray titania coating can be attributed to an increased power density of light on the surface of gray titania by fluorescence.

DOI： 10.1016/j.apsusc.2018.04.106

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High temperature characterization of binary and ternary bi alloys microalloyed with Cu and Ag 査読有り

Yu M., Matsugi K., Xu Z., Choi Y., Yu J., Motozuka S., Nishimura Y., Suetsugu K.

Materials Transactions 59 ( 2 ) 303 - 310 2018年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2018 The Japan Institute of Metals and Materials. The s-orbital energy level (Mk) of alloying elements in a Bi cluster was used to determine the composition for alloys of this system for use as Pb-free high-temperature solders. Binary Bi-Cu and Bi-Ag alloys with ΔMk of 0.013-0.343 and ternary Bi-2.0Ag-0.5Cu and Bi-5.0Ag-0.5Cu alloys with ΔMk of 0.180 and 0.379, respectively, were fabricated and tensile tested at 423 K; here, ΔMk is the compositional average of Mk. The flow stress and fracture strain at 423 K increased after the alloying elements were added to the alloys. The relationships between the 0.2% proof stress, ultimate tensile strength or fracture strain, and ΔMk were similar to those determined previously through tests performed at 293 K. Thus, these relationships could be useful for predicting the stress and fractures strain levels based on ΔMk, regardless of the temperature and alloy composition. Moreover, a transition from ductility to brittleness was observed at 348-373 K for both ternary alloys. In addition, the melting points of the ternary alloys lay between 536 and 538 K, indicating that the alloys would be suitable as hightemperature solders. The contact angles of molten droplets of 10 of the experimental binary and ternary alloys on a Cu plate as determined at 973 K were 24-30°. This confirmed that the alloys exhibited good wettability with respect to Cu. Finally, the ternary Bi-2.0Ag-0.5Cu and Bi-5.0Ag-0.5Cu alloys showed thermal conductivities of 12.1 and 15.9 W/m/K, respectively, at 373 K; these were lower than that (30.4 W/m/K) of Pb-5Sn.

DOI： 10.2320/matertrans.MAW201710

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塑性変形で集合組織を付与した鉄粒子による圧粉体の開発

本塚智

天田財団助成研究成果報告書 ( 公益財団法人天田財団 ) 31 ( 0 ) 79 - 82 2018年01月

Formation process of the {001} fiber texture on iron particles using simple ball milling 査読有り

Motozuka S., Ikeda T., Miyagawa T., Sato H., Morinaga M.

Powder Technology 321 9 - 12 2017年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2017 Elsevier B.V. The process of texture formation on iron particles was investigated via simple ball milling using graphite particles as milling aid. During milling, the shape of the iron particles changed from granular to platelets owing to repetitive compression and balls rolling in a direction perpendicular to the platelet faces. Simultaneously, a {001} + {111} double-fiber texture was formed, which is characteristic of a metal with a bcc structure deformed under uniaxial compression and multidirectional rolling. Based on these observations, it is concluded that the texture obtained through simple ball milling was induced by uniaxial compression and a multidirectional-rolling-like deformation. Since the main component of the double-fiber texture is {001} and the easy magnetization axes 〈001〉 are oriented toward the in-plane directions with the platelet face in the texture, the iron particles are ideal candidates for use as magnetic cores in motors, inductors, and other electromagnetic parts.

DOI： 10.1016/j.powtec.2017.08.010

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Mechanochemical surface modification of carbon fibers using a simple rubbing method 査読有り

Motozuka S., Tagaya M., Hayashi K., Kameyama T., Oguri H., Xu Z.

Journal of Composite Materials 51 ( 25 ) 3577 - 3584 2017年10月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2017, © The Author(s) 2017. A simple rubbing treatment was used to mechanochemically modify the surface of polyacrylonitrile-based carbon fibers and its effect on their surface structure and functional groups was studied using several surface characterization techniques. To control the mechanochemical effect, the shear forces accompanying rubbing were kept constant. Scanning electron microscopy tests and the peak positions and widths of the main Raman spectroscopy bands indicated that there were no morphological changes to the carbon fibers following rubbing. In contrast, X-ray photoelectron spectroscopy showed an increase in oxygen-containing functional groups; in addition to hydroxyl species, the main groups introduced were alkoxide, carbonyl, and carboxyl groups. The ratio of carboxyl groups on the carbon fiber surface increased with the shear force magnitude, indicating carbon surface oxidation. The difference between the Raman and X-ray photoelectron spectroscopy results indicates that the modification was confined to the first few atomic layers; therefore, this rubbing method is capable of producing efficient mechanochemical surface modification of carbon fibers. This technique is simple, is relatively inexpensive, and is applicable to carbon fiber-reinforced plastic processing techniques.

DOI： 10.1177/0021998316687030

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An investigation into photofunctional interfaces of 8-hydroxyquinoline/hydroxyapatite hybrids 査読有り

Tagaya M., Motozuka S.

Optical Materials 66 392 - 398 2017年04月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2017 Elsevier B.V. Organic/inorganic hybrids of 8-hydroxyquinoline (8Hq) molecule and hydroxyapatite nanocrystal (HAp) were mechanochemically prepared. In the hybrids, a green photoluminescence peak at 500 nm newly appeared, suggesting the chemical bonding of the 8Hq molecule with the Ca2+ ions of HAp. Then, the organic/inorganic interfacial photofunction was clarified by a molecular orbital calculation. The interfacial chemical bonding between the O and N atoms of 8Hq and the Ca2+ ions of HAp was attributed to both covalent O[sbnd]Ca and ionic N[sbnd]Ca. The resultant wave functions revealed that the green luminescence was attributed to metal-to-ligand charge transfer (MLCT) from the O atoms of phosphate group (HAp) to the π-cloud (8Hq) in the HOMO of the hybrids. Therefore, the photofunctional interfaces of the hybrids were successfully demonstrated.

DOI： 10.1016/j.optmat.2017.02.036

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Surface-engineered mesoporous silica particles with luminescent, cytocompatible and targeting properties for cancer cell imaging 査読有り

Tagaya M., Abe S., Motozuka S., Shiba K., Takemura T., Hayashi I., Sakaguchi Y.

RSC Advances 7 ( 22 ) 13643 - 13652 2017年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

© The Royal Society of Chemistry. To develop a novel cancer cell imaging approach, we fabricated surface-engineered mesoporous silica (MPS) particles with multi-functionalities. Specifically, mechanochemically-treated europium(iii)-doped MPS (Eu:MPS) particles were prepared, and a folate N-hydroxysuccinimidyl ester (FA-NHS) molecule was immobilized on the particle surface as a targeting ligand for specific types of cells. With the mechanochemical treatment, the siloxane bonds were changed to show better luminescence quantum efficiency as revealed by 29Si-NMR and photoluminescence spectroscopy, suggesting interaction changes between the silica framework structures and the doped Eu ions. Furthermore, the mechanochemically-treated particles immobilized with FA-NHS specifically bind to the cancer cells and the subsequent uptake by the cells was in situ observed using time-lapse optical microscopy. The particles did not exhibit any toxicity in the cellular proliferation stages. The particles after the binding and uptake also showed intense luminescence from the cells at a culture time of 24 h, demonstrating a clear imaging ability along with all the cellular shapes. Therefore, the present surface-engineered luminescent particles will be used for specific cancer targeting and imaging purposes.

DOI： 10.1039/c7ra00535k

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Tensile properties of Bi alloys and a case study for alloy design in their application to high temperature solders 査読有り

Yu M., Xu Z., Choi Y., Konishi T., Matsugi K., Yu J., Motozuka S., Suetsugu K.

Materials Transactions 58 ( 2 ) 140 - 147 2017年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

©2017 The Japan Institute of Metals and Materials. The s-orbital energy levels (Mk) of some alloying elements in a Bi cluster model were obtained on the basis of the molecular orbital calculation. In contrast, binary Bi-Cu/-Ag/-Zn system alloys with ΔMk of 0.013-0.343 were manufactured and tension- or hardness-tested, where ΔMk was the compositional average of Mk. The ultimate tensile strength and hardness were improved as alloying elements were added and increased in alloys. There was the relation between the ultimate tensile strength, fracture strain or hardness and ΔMk. Further, the compositions of Bi-2.0Ag-0.5Cu (ΔMk: 0.180), Bi-5.0Ag-0.5Cu (ΔMk: 0.379) and Bi-0.25Cu-0.25Sb (ΔMk: 0.044) were proposed as ternary alloys. It is found that the ultimate tensile strength, fracture strain and hardness values of ternary alloys could be also able to predict using their estimation lines obtained from binary Bi system alloys.

DOI： 10.2320/matertrans.MA201605

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Effect of Cationic Surfactant Micelles on Hydroxyapatite Nanocrystal Formation: An Investigation into the Inorganic-Organic Interfacial Interactions 査読有り

Shiba K., Motozuka S., Yamaguchi T., Ogawa N., Otsuka Y., Ohnuma K., Kataoka T., Tagaya M.

Crystal Growth and Design 16 ( 3 ) 1463 - 1471 2016年03月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2016 American Chemical Society. To clarify hydroxyapatite (HAp) nanocrystal formation based on the interfacial interactions with organic molecules is important for controlling the dispersion states/shapes of HAp and understanding the biomineralization mechanism. In this study, the effects of cetyltrimethylammonium bromide (CTAB) micelles on the HAp nanocrystal formation process were investigated through both the morphosynthesis technique and the molecular orbital calculations. The HAp nanocrystals synthesized in the presence of CTAB exhibited a controlled rod-like shape and subsequently grew up by a thermal treatment to be larger-sized nanocrystals at a well-dispersed state. It was also found that the CTAB micelles strained and disordered at the higher temperature effectively induced heterogeneous nucleation to initiate the nucleation/growth processes. In contrast, HAp nanocrystals synthesized without CTAB exhibited irregular-shaped and aggregated nanocrystals, which are due to dominantly occurring homogeneous nucleation. According to the molecular orbital calculations, the cationic N atom of the CTAB molecule strongly interacted with the Ca ion in the a-plane as well as the hydroxyl/phosphate groups in the c-plane of HAp via ionic/covalent bonding (e.g., only ionic bonding at the closer interfacial distance at 1.0 Å), leading to effective nucleation on the micelle surfaces. Therefore, a possible reason for the rod-like and well-dispersed nanocrystal formation is due to the heterogeneous nuclei formation/growth on the N atoms of CTAB micelles and subsequent fusion growth among the CTAB micelle-directed inorganic-organic complexes in the confined spaces. The present results will be applicable for designing tailored HAp morphologies based on inorganic-organic hybrid interaction systems.

DOI： 10.1021/acs.cgd.5b01599

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Application and compositional optimization of Zn alloys for high temperature solders 査読有り

Xu Z., Choi Y., Niimi T., Yu M., Motozuka S., Matsugi K., Suetsugu K.

Materials Transactions 57 ( 4 ) 553 - 557 2016年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2016 The Japan Institute of Metals and Materials. The effectiveness of the electronic parameter on the predicting the mechanical properties of Zn system alloys for high temperature applications was evaluated in order to satisfy both the tensile strength of 200 MPa and elongation of 5%. The electronic parameter was used s-orbital energy level (ΔMk) in this study. Promising composition of alloys were Zn-4Al-7Sn, Zn-10Al-0.5Sn, Zn-10Al-2Sn and Zn-5.1Al-0.5Sn in mass%, and their ΔMk values were 0.079, 0.080, 0.089 and 0.045, respectively. The experimental results of tensile test for designed alloys showed that the tensile strength of 195-225 MPa depend on the increment of ΔMk values, and elongation are 4.5-5.1%. Optimization of composition on Zn system alloys was found to be speedy and precisely achieved using the ΔMk parameter. The wetting contact angles between Cu plate and the designed alloys of Zn-4Al-7Sn, Zn-10Al-0.5Sn, Zn-10Al-2Sn and Zn-5.1Al-0.5Sn at 973 K in the Ar stream are 33.8°, 43.3°, 50.1° and 44.3°, respectively, suggesting that the designed alloys can be practically applied at high temperature. Moreover, the thermal conductivity, tensile test of designed alloys at high temperature were also evaluated.

DOI： 10.2320/matertrans.MBW201514

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Formation of stacked luminescent complex of 8-hydroxyquinoline molecules on hydroxyapatite coating by using cold isostatic pressing 査読有り

Matsuya T., Otsuka Y., Tagaya M., Motozuka S., Ohnuma K., Mutoh Y.

Materials Science and Engineering C 58 127 - 132 2016年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2015 Elsevier B.V. All rights reserved. Cold isostatic pressing successfully formed a chelate complex of 8-hydroxyquinoline (8Hq) molecules on plasma-sprayed hydroxyapatite (HAp) coating by solid-state reaction. The complex emits a fluorescence peak at approximately 500 nm by UV irradiation. The red shift of the fluorescence was newly observed in the cases of highly compressed complex due to π - π stacking of aromatic ring in the molecular structure of 8Hq. The immersed complex coating in Simulated Body Fluid (SBF) demonstrated amorphous apatite precipitation and kept its fluorescence property.

DOI： 10.1016/j.msec.2015.08.020

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2G44 水酸アパタイト/アミノ酸蛍光錯体と光触媒の複合皮膜を用いた可視光照射による抗菌性評価

MORAKUL Sarita, 大塚雄市, 大沼清, 多賀谷基博, 本塚智, 宮下幸雄, 武藤睦治

バイオエンジニアリング講演会講演論文集 ( 一般社団法人日本機械学会 ) 2016 ( 0 ) _2G44 - 1_-_2G44-4_ 2016年01月

記述言語：日本語掲載種別：研究論文（学術雑誌）

This study aims at forming a fluorescent complex between HAp coatings with ligands of amino acid by using CIP process in order to suppress cytotoxicity of conventional fluorescent HAp complex and also enhance antibacterial properties by visible light irradiation. Three amino acids, phenylalanine, tryptophan and tyrosine were used in the CIP process. By applying pressures from 200 MPa to 800 MPa, fluorescence of HAp with the three amino acids was successfully observed by UV irradiations. In the case of highly compressed samples, fluorescence in some regions was shifted to longer wavelength. Cytotoxicity assessments were conducted by using MC3T3-E1 osteoblast cells. Observing optical density of mediums after cultivations revealed that there were no significant differences among five groups in cases of same culture periods. The results demonstrated that biocompatibility of HAp/amino acid complex was similar to HAp itself.

DOI： 10.1299/jsmebio.2016.28._2G44-1_

その他リンク： https://ci.nii.ac.jp/naid/110010052253

鉛フリー高温はんだ用Bi系合金の設計と高温特性

許哲峰, 于美琪, 八木祐樹, 崔龍範, 松木一弘, 本塚智, 末次憲一郎

鋳造工学全国講演大会講演概要集 ( 公益社団法人日本鋳造工学会 ) 168 ( 0 ) 98 - 98 2016年01月

917 水酸アパタイト-アミノ酸蛍光錯体/光触媒複合皮膜の可視光照射による抗菌性評価(OS9-2 バイオエンジニアリング(1):生体材料・バイオミメティクス)

MORAKUL Sarita, 大塚雄市, 大沼清, 多賀谷基博, 本塚智, 宮下幸雄, 武藤睦治

北陸信越支部総会・講演会　講演論文集 ( 一般社団法人日本機械学会 ) 2016 ( 0 ) _917 - 1_-_917-5_ 2016年01月

記述言語：日本語掲載種別：研究論文（学術雑誌）

This study aims at forming a fluorescent complex between HAp coatings and amino acid ligands by using CIP process in order to suppress cytotoxicity of conventional fluorescent HAp complex and also enhance antibacterial properties by visible light irradiation. Three amino acids, phenylalanine, tryptophan and tyrosine were successfully fabricated by applying pressures 800 MPa for 1.2 ks. Fluorescence by complex of HAp with three amino acids was observed by UV irradiations. Cytotoxicity assessments were conducted by using MC3T3-E1 osteoblast cells. Observing optical density of mediums after cultivations revealed no significant differences among five groups in the same culture periods. The results demonstrated that biocompatibility of HAp/amino acid complex was similar to HAp itself. The reduction of bacterial growth rate was observed in antibacterial evaluation after irradiating visible light. The fluorescent complex HAp/ photocatalyst coating showed significant reducing of bacterial growth rate comparing with the cases by non-fluorescent HAp coating.

DOI： 10.1299/jsmehs.2016.53._917-1_

その他リンク： https://ci.nii.ac.jp/naid/110010045868

グリーンCFRP創製に向けた炭素繊維の表面・界面制御技術

多賀谷基博, 本塚智

マテリアルステージ 1 54 - 57 2016年01月

Texture formation in iron particles using mechanical milling with graphite as a milling aid 査読有り

Motozuka S., Tagaya M., Hayashi K., Morinaga M.

AIP Advances 5 ( 9 ) 2015年09月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2015 Author(s). Crystallographically anisotropic platelet iron particles were successfully prepared using a conventional ball mill with addition of graphite (Gp) particles. The morphological and structural changes resulting from the milling were investigated using scanning electron microscopy and X-ray diffraction. The spherical iron particles were plastically deformed into platelet shapes during the milling. Simultaneously, it is suggested that the size of the Gp particles decreased and adhered as nanoparticles on the surface of the iron particles. The adhered Gp particles affected the plastic deformation behavior of the iron particles: the {001} planes of α-iron were oriented parallel to the particle face, and no preferred in-plane orientation was observed. This study not only details the preparation of soft magnetic metal particles that crystallographically oriented to enhance their magnetic properties but also provides new insight into the activities of the well-established and extensively studied mechanical milling method.

DOI： 10.1063/1.4930915

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