研究者詳細 - 中戸　晃之

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85118898510&origin=inward

Preparation of cellulose nanocrystal based core-shell particles with tunable component location 査読有り国際誌

Zhang J., Furushima H., Nakato T., Mouri E.

Chemistry Letters ( 公益社団法人日本化学会 ) 50 ( 2 ) 240 - 243 2021年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

We report a versatile method for preparing a particulate composite based on cellulose nanocrystals (CNCs) and polyethylene glycol (PEG) via a self-organized precipitation method. The particulate composite had a coreshell structure, and depending on the molecular weight of the PEG, two types of particulates could form: one with CNCs as the core and the other with CNCs as the shell.

DOI： 10.1246/CL.200702

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85100721532&origin=inward

A Review of Flax Fiber Reinforced Thermoset Polymer Composites: Thermal-Physical Properties, Improvements and Application 査読有り国際誌

Malik K., Ahmad F., Yunus N.A., Gunister E., Nakato T., Mouri E., Ali S.

Journal of Natural Fibers 19 ( 15 ) 10412 - 10430 2021年01月

記述言語：英語掲載種別：記事・総説・解説・論説等（学術雑誌）

Flax is the strongest natural fiber used as reinforcement for polymer-based composites due to its ecological properties, low specific gravity, renewability, biodegradability, recyclability besides its high mechanical properties. However, thermal properties of flax fibers depend on its chemical composition and structure, so it should be carefully controlled during the production process of composites, which affect the final product performance. A review of flax fiber-reinforced thermoset composites (FRTCs) and their hybrids is presented in the article, mainly focus on thermal performance, water absorption, and durability of the composites. The effects of filler materials hybridization and fiber’s chemical modification on the properties and performance of the FRTCs are also covered. Finally, key industrial applications and future possible research work based on the current understanding of FRTCs, and their hybrids also are addressed.

DOI： 10.1080/15440478.2021.1993507

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85118277270&origin=inward

A Review of Flax Fiber Reinforced Thermoset Polymer Composites: Structure and Mechanical Performance 査読有り国際誌

Malik K., Ahmad F., Gunister E., Nakato T., Mouri E., Muhammad M.B., Ali S.

Journal of Natural Fibers 19 ( 14 ) 9656 - 9680 2021年01月

記述言語：英語掲載種別：記事・総説・解説・論説等（学術雑誌）

Flax is a natural fiber that possesses excellent specific properties, low density, safe to handle, eco-friendly, and easily available. These make it exceedingly popular and a potential candidate to replace synthetic reinforcements in polymer composite applications. The thermoset polymer is used for structural application due to its excellent mechanical and interface bonding properties compared to the thermoplastic polymer. Flax-based thermoset polymer composites are becoming popular among researchers for advanced industrial applications. This article is intended to offer a review of the main results presented in the literature on flax fiber-based polymer composites, focusing the attention on the fiber structure, chemical arrangement, physical and mechanical properties. Then, the mechanical performance of pure and hybrid flax fiber reinforced epoxy or polyester composites is comprehensively analyzed.

DOI： 10.1080/15440478.2021.1990182

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85119350595&origin=inward

ZnO decorated on low carbonate NiAl-layered double hydroxide as efficient photocatalyst for methyl orange degradation 査読有り国際誌

Intachai S., Nakato T., Khaorapapong N.

Applied Clay Science 201 2020年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2020 Elsevier B.V. The decoration of zinc oxide (ZnO) nanorods on layered structure of low carbonate NiAl-layered double hydroxide (NiAl-LDH) was conducted by a combination of an aqueous solution of zinc chloride and an aqueous suspension of NiAl-LDH under hydrothermal method and subsequent calcination at 250 °C for 6 h. A series of the products, ZnO/NiAl-LDH(x), where x was a Zn2+ content, were characterized by X-ray diffraction, transmission electron microscopy, surface analysis, as well as UV–visible and photoluminescence spectroscopies. The slight shift of the reflection at around 11° as well as the appearance of two peaks at around 23° and 47° in the X-ray diffraction patterns, and the decrease of the vibration mode of CO32‐− (at 1359 cm−1) in Fourier transform infrared spectra confirmed the deintercalation of CO32− on/in layered double hydroxide. The presence of the reflections due to zinc oxide at around 32°, 33° and 36° and transmission electron microscope images demonstrated the images of zinc oxide nanorods distributed on the external surface of the hexagonal plates of the layered double hydroxide, verified the formation of zinc oxide crystal in the products. The band gap energy value of the products was highly dependent on the amount of zinc oxide in the products that played an important role in the photodegradation enhancement of methyl orange in aqueous solution and the catalytic reusing performance.

DOI： 10.1016/j.clay.2020.105927

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85096545871&origin=inward

粘土鉱物による機能材料作製招待有り査読有り

中戸晃之

化学と教育 ( 公益社団法人日本化学会 ) 68 ( 9 ) 364 - 367 2020年09月

担当区分：筆頭著者,　責任著者記述言語：日本語掲載種別：記事・総説・解説・論説等（学術雑誌）

粘土鉱物が具備する層状の結晶構造と同形置換の2つの特徴は，板状の粒子形態，吸着・イオン交換，分子性質の改変，コロイドの形成という4つの基本的な特性を粘土鉱物に与える。これらの特性を活用して，粘土鉱物から遮水，洗浄，分析，情報記録，さらには人工光合成などに関係する多彩な機能材料が開発されている。

DOI： 10.20665/kakyoshi.68.9_364

その他リンク： http://id.ndl.go.jp/bib/030674599

Optical Manipulation of a Single Clay Nanosheet Hybridized with a Porphyrin Derivative 査読有り国際誌

YUKI HIGASHI, YASUTAKA SUZUKI, TERUYUKI NAKATO, MAKOTO TOMINAGA, JOSEF BREU, TOSHIAKI IWAI, JUN KAWAMATA

OSA Continuum 3 ( 6 ) 1545 - 1554 2020年06月

記述言語：英語掲載種別：研究論文（学術雑誌）

The effect of hybridization of a clay fluorohectorite (FHT) nanosheet with a π-conjugated organic compound, α,β,γ,δ-tetrakis(1-methylpyridinium-4-yl)porphyrin p-toluenesulfonate (TMPyP), on its optical manipulation is investigated. Although the hybridized FHT is optically trapped essentially in the same manner as that of neat FHT, the hybridization with TMPyP allows for manipulation of FHT with lower laser intensity or a shorter period, or both. This is ascribed to the larger refractive index and polarizability of TMPyP compared with neat FHT.

DOI： 10.1364/OSAC.393652

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85099438521&origin=inward

Development of Structural Color by Niobate Nanosheet Colloids 査読有り国際誌

Mouri E., Ogami C., Fukumoto T., Nakato T.

Chemistry Letters ( 公益社団法人日本化学会 ) 49 ( 6 ) 717 - 720 2020年06月

担当区分：責任著者記述言語：英語掲載種別：記事・総説・解説・論説等（学術雑誌）

© 2020 The Chemical Society of Japan Inorganic nanosheets obtained by exfoliation of layered crystals of hexaniobate in water form colloidal liquid crystals. We found that they develop various structural colors by moderating nanosheet concentration and ionic atmosphere.

DOI： 10.1246/cl.200164

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85087054850&origin=inward

無機ナノシート液晶の発見と展開招待有り査読有り

中戸晃之

粘土科学 ( 一般社団法人日本粘土学会 ) 59 ( 2 ) 46 - 51 2020年01月

担当区分：筆頭著者,　責任著者記述言語：日本語掲載種別：記事・総説・解説・論説等（学術雑誌）

Inorganic nanosheets obtained by exfoliation of layered crystals such as smectite-type clays have been actively investigated as building blocks of nanomaterials in the past 25 years. However, their colloidal systems were at the outside of such a research trend. At the beginning of 21st century, liquid crystalline behavior of colloidal nanosheets was recalled into academic studies, and then the materials chemistry of 'nanosheet liquid crystals' has been gradually developed. Many popular nanosheets have been registered at the library of liquid crystals. Nanosheet liquid crystals are rare examples of inorganic soft materials, whose properties are greatly different from their mother crystals due to their softness. A typical property of nanosheet liquid crystals is structural coloration reflecting long periodic lengths between nanosheets. Also, technical inventory of manipulating liquid crystalline nanosheets has been enriched as exemplified by electric alignment and optical manipulation. Hierarchical structures of liquid crystalline nanosheets up to mm-level lengths have been organized with appropriate combination of manipulating techniques.

DOI： 10.11362/jcssjnendokagaku.59.2_46

その他リンク： https://ci.nii.ac.jp/naid/130007896095

九州工業大学工学部応用化学科の化学実験教育招待有り査読有り

中戸晃之, 竹中繁織, 岡内辰夫, 山村方人, 植田和茂

化学と教育 ( 公益社団法人日本化学会 ) 68 ( 3 ) 114 - 117 2020年01月

担当区分：責任著者記述言語：英語掲載種別：記事・総説・解説・論説等（その他）

九州工業大学工学部応用化学科では，2年次前期より3年次後期にかけて，分析化学，物理化学，有機化学，化学工学・無機化学の順序で，学生実験を実施している。実験技術の習得に加え，エンジニアリングデザイン，コミュニケーション，チームワークなどの能力の涵養も目的としている。有機化学実験ではPBL（課題解決型学習）方式を取り入れており，学生アンケートや教員の実感では有効に機能していると考えられる。

DOI： 10.20665/kakyoshi.68.3_114

その他リンク： https://ci.nii.ac.jp/naid/130007993107

Electrolyte-dependence of the macroscopic textures generated in the colloidal liquid crystals of niobate nanosheets 査読有り

Jie Zhang, K. Morisaka, T. Kumamoto, E. Mouri, T. Nakato

Colloids and Surfaces A 556 106 - 112 2018年11月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

Liquid crystalline aqueous colloids of inorganic nanosheets with thickness of 1 nm and lateral size of several micrometers were prepared from exfoliation of layered niobate, and they were hierarchically organized to generate macroscopic textures through the formation of sub-mm nanosheet domains as the secondary building blocks. The nanosheet domains were unidirectionally aligned with orthogonally applied gravity and electric field to generate macroscopic stripes along gravity in ideal cases as we reported previously [Phys Chem Chem Phys (2014) 16: 955–962]. However, other textures such as broken stripes, drops, and nets are also obtained. The generated textures were quantitatively evaluated by image analysis of polarized optical microscope images of the samples. Uniformity and homogeneity of the stripes were evaluated by using contrast of pixels in the longitudinal and transverse directions with respect to gravity. After dialyzing a colloid with electrolytes (∼ 10–3 mol L–1), the sample comes to form of stripes more easily and “good stripes” with lengthy and homogeneous nanosheet alignment were generated after dialyzing a nanosheet colloid with KCl. Measurements of pH and conductivity of the dialyzed samples indicated the presence of suitable pH and conductivity regions for the generation of stripes.

DOI： 10.1016/j.colsurfa.2018.08.016

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85051648050&origin=inward

LASER BEAM INDUCED ORIENTATION CONTROL OF A NANOSHEET LIQUID CRYSTAL BY EMPLOYING AN OBJECTIVE LENS WITH A LOW NUMERICAL APERTURE 査読有り国際誌

NAGASHITA Takashi, HIGASHI Yuki, IKEDA Akira, TOMINAGA Makoto, KUMAMOTO Takuya, SUZUKI Yasutaka, NAKATO Teruyuki, KAWAMATA Jun

Clay Science ( 一般社団法人日本粘土学会 ) 22 ( 1 ) 13 - 17 2018年06月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

Optical manipulation of nanosheet liquid crystals prepared by exfoliation of inorganic layered crystals realizes local and on-demand orientation control of nanosheets. Although a tightly focused laser beam by using an objective lens with a high numerical aperture (NA) is typically employed for the optical manipulation to enhance the gradient force of an irradiated laser beam, the dominant driving force of the optical orientational manipulation of nanosheets has recently been attributed to the scattering force, suggesting that an objective lens with a high NA is not indispensible for the nanosheet manipulation. In this study, we carried out optical orientational manipulation of nanosheets using an objective lens with low NA, 0.4, and compared the results with those obtained by a lens with high NA, 1.2. Orientational manipulation was realized with both of the lenses, and the size of the manipulated domain using a lens with NA=0.4 was smaller than that obtained by using a lens with NA=1.2. The domain size increased with the irradiated laser power, reflecting the dominant contribution of scattering force to the optical manipulation of nanosheet liquid crystals.

DOI： 10.11362/jcssjclayscience.22.1_13

その他リンク： https://ci.nii.ac.jp/naid/130007384642

OPTICAL TRAPPING AND ORIENTATION MANIPULATION OF 2D INORGANIC MATERIALS USING A LINEARLY POLARIZED LASER BEAM 査読有り

M. Tominaga, Y. Higashi, T. Kumamoto, T. Nagashita, T. Nakato, Y. Suzuki, J. Kawamata

Clays and Clay Minerals 66 ( 2 ) 138 - 145 145 2018年04月

記述言語：英語掲載種別：研究論文（学術雑誌）

Because inorganic nanosheets, such as clay minerals, are anisotropic, the manipulation of nanosheet orientation is an important challenge in order to realize future functional materials. In the present study, a novel methodology for nanosheet manipulation using laser radiation pressure is proposed. When a linearly polarized laser beam was used to irradiate a niobate (Nb6 O4-17 ) nanosheet colloid, the nanosheet was trapped at the focal point so that the in-plane direction of the nanosheet was oriented parallel to the propagation direction of the incident laser beam so as to minimize the scattering force. In addition, the trapped nanosheet was aligned along the polarization direction of the linearly polarized laser beam. Thus, unidirectional alignment of a nanosheet can be achieved simply by irradiation using a laser beam.

DOI： 10.1346/CCMN.2018.064075

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85051475156&origin=inward

Optical control of orientation of nanosheet in colloidal state 査読有り国際誌

Suzuki Y., Tominaga M., Nagashita T., Iwai T., Nakato T., Kawamata J.

Proceedings of SPIE - The International Society for Optical Engineering 10712 2018年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2018 SPIE. A 100 micrometer sized hierarchical structure consisting of nanosheet can be obtained at the focus of laser beam in nanosheet colloid. This large sized structure was obtained from the colloidal liquid crystallinity of two-dimensional inorganic particles and laser radiation pressure. The scattering force of the laser beam converted the parallel nanosheet alignment to the direction of the incident laser beam. A giant tree-ring-like nanosheet texture is independent of the polarization direction, was organized at the periphery of the focal point.

DOI： 10.1117/12.2323309

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85049130710&origin=inward

A LASER BEAM INDUCED OPTICAL MANIPULATION OF A SMECTITE 査読有り

HIGASHI Yuki, NAGASHITA Takashi, NAKATO Teruyuki, SUZUKI Yasutaka, KAWAMATA Jun

Clay Science ( 一般社団法人日本粘土学会 ) 22 ( 3 ) 79 - 83 2018年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

On-demand and local manipulation of exfoliated clay nanosheets in colloidal dispersions enables a variety of novel applications of clay-based materials. In this study, manipulation of a single fluorohectorite nanosheet by utilizing the radiation pressure of a tightly focused laser beam was demonstrated. When a linearly polarized continuous laser beam was irradiated to a fluorohectorite nanosheet, the nanosheet was oriented with its in-plane direction parallel to the propagation direction of the laser beam. Furthermore, the nanosheet edge was directed in parallel to the polarization direction of the laser beam. When the polarization direction of the laser beam was rotated, the nanosheet was rotated following the rotation of the polarization direction.

DOI： 10.11362/jcssjclayscience.22.3_79

その他リンク： https://ci.nii.ac.jp/naid/130007529591

Textural diversity of hierarchical macroscopic structures of colloidal liquid crystalline nanosheets organized under electric fields 査読有り国際誌

Nakato T., Nono Y., Mouri E.

Colloids and Surfaces A: Physicochemical and Engineering Aspects 522 373 - 381 2017年06月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

© 2017 Elsevier B.V.Inorganic nanosheets prepared by exfoliation of layered crystals of niobate form colloidal liquid crystals, and liquid crystalline niobate nanosheets are hierarchically organized to develop macroscopic textures. They are obtained through a two-stage process, which is growth of the liquid crystalline domains called tactoids induced by incubation and subsequent alignment of the tactoids with an electric field. Diverse macroscopic textures with sub-mm scale characteristic size are organized from niobate nanosheet liquid crystals by varying both of the tactoid growth and electric alignment processes. The tactoid growth is regulated by the nanosheet concentration and elapsed time for the incubation. Application of an AC electric field to the incubated samples turns the nanosheet alignment to the direction parallel to the field, resulting in developing various macroscopic textures. The texture depends on the nanosheet concentration; dendritic, net-like, and interdigitated textures are evolved at low, middle, and high nanosheet concentrations, respectively. Thickness of sample cell for the electric field application also influences the texture. The tactoid size is comparable to the characteristic length of the textures under the electric field even though the tactoid size exceeds the cell thickness. Continuous application of the electric field indicates temporal nature of the texture organization as the textures are gradually collapsed; larger electric voltages tend to generate and collapse the textures faster.

DOI： 10.1016/j.colsurfa.2017.02.092

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85015910959&origin=inward

Electric Alignment of Liquid Crystalline Colloidal Nanosheets Prepared by Exfoliation of Layered Oxides

Teruyuki Nakato

Clay Science ( 日本粘土学会 ) 21 13 - 20 2017年03月

Contribution from the Symposium at the 60th Forum of the Clay Science Society of Japan : ELECTRIC ALIGNMENT OF LIQUID CRYSTALLINE COLLOIDAL NANOSHEETS PREPARED BY EXFOLIATION OF LAYERED OXIDES 招待有り査読有り国際誌

Nakato Teruyuki

Ｃｌａｙ　Ｓｃｉｅｎｃｅ ( 一般社団法人日本粘土学会 ) 21 ( 1 ) 13 - 20 2017年01月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：記事・総説・解説・論説等（学術雑誌）

Colloidal nanosheets are obtained by exfoliation of inorganic layered crystals such as clay minerals in water. They form colloidal liquid crystals at high nanosheet concentrations due to their shape anisotropy. Liquid crystalline nanosheets can be aligned under external fields. For this purpose, electric field is advantageous owing to its facile instrumentation, controllability, quantitative reproducibility, and broad applicability. AC electric field is utilized for aligning liquid crystalline nanosheets because the samples are aqueous colloids of electrically charged particles. The 2D shape of nanosheets facilitates alignment of their longitudinal direction parallel to the electric field in many cases. When a colloid sample is incubated to grow liquid crystalline domains up to the size of sub-mm scale, hierarchical macroscopic structures are evolved under electric fields, where the grown domains play a role of secondary building blocks. The final structure varies depending on the relative direction of applied electric field and gravity. An electric field applied parallel to gravity gives a net-like assembly of the nanosheet domains, whereas orthogonal application of an electric voltage and gravity assembles nanosheets in stripes spanning over more than 1-mm length through unidirectional nanosheet alignment. Such flexible organization of nanosheet-based structures is a unique aspect of exfoliated nanosheets in colloidal liquid crystalline states.

DOI： 10.11362/jcssjclayscience.21.1_13

Photoinduced electron transfer between semiconducting nanosheets and acceptor molecules in the presence of colloidal clay particles 査読有り国際誌

Nakato T., Shimizu M., Edakubo H., Mouri E.

Applied Clay Science 130 76 - 82 2016年09月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

© 2016 Elsevier B.V.Binary clay colloids prepared by mixing smectite and other particles can exhibit unusual properties based on physical and chemical interactions between the colloidal particles. We prepared a binary colloidal system of layered fluoroniobate (K2NbO3F) and synthetic hectorite (Laponite) particles and examined photoinduced electron transfer in the colloid to which electron accepting methylviologen (MV2 +) was added. Exfoliation and nanosheet formation of the fluoroniobate were not evidenced, but it was transformed in water to 3D crystalline species that was easily settled down. Addition of a large amount of hectorite suppressed the settlement of the fluoroniobate particles to stabilize the colloid for a few days. When MV2 + ions were introduced to the binary colloid, the organic species was adsorbed on the hectorite particles and electron transfer occurred from the fluoroniobate particles to the MV2 + ions upon UV irradiation. Addition of propylammonium ions to the system enhanced the yield and stability of the photoproduct while an optimal amount was found. This was ascribed to the scarifying hole scavenging by the propylammonium species although the photoinduced electron transfer can occur in its absence.

DOI： 10.1016/j.clay.2016.03.007

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84960510711&origin=inward

Perspective: Recent developments in hybrid hydrogels containing inorganic nanomaterials 査読有り国際誌

Malgras V., Kamachi Y., Kamachi Y., Nakato T., Yamauchi Y., Miyamoto N.

Nanoscience and Nanotechnology Letters 8 ( 4 ) 355 - 359 2016年04月

記述言語：英語掲載種別：研究論文（学術雑誌）

Copyright © 2016 American Scientific Publishers.Poly(N-isopropylacrylamide) (PNIPAm) has been well known as a thermosensitive polymer and has been extensively studied for many applications such as drug delivery systems (DDS) as well as biomedical and tissue engineering. Recently, the hybridization of hydrogels with well-defined nanostructured inorganic materials is emerging as a promising and efficient technique to improve their properties. Newly developed hydrogels with superior properties and smart functions can achieve a great performance in the field of drug delivery systems, sensors, coatings, artificial organs, and chemical actuators for microfluidics and molecular robots. Here we briefly review recent advances in this emerging field.

DOI： 10.1166/nnl.2016.2140