論文 - 鶴岡 孝章
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Development of a CaCO3 Precipitation Method Using a Peptide and Microwaves Generated by a Magnetron 査読あり
Fumihiro Kayamori, Hiroyuki Togashi, Natsumi Endo, Makoto Ozaki, Kan Hirao, Yonejiro Arimoto, Ryuji Osawa, Takaaki Tsuruoka, Takahito Imai, Kin-ya Tomizaki, Tomohiro Umetani, Nobuhiro Nakanishi, Kenji Usui
Processes 12 ( 7 ) 1327 - 1327 2024年6月
出版者・発行元：MDPI AG
Microwave applications, such as microwave ovens and mobile phones, are ubiquitous and indispensable in modern society. As the utilization of microwave technology is becoming more widespread, the effects of microwaves on living organisms and physiological processes have received increased attention. This study aimed to investigate the effects of microwaves on calcium carbonate biomineralization as a model biochemical process. A magnetron oscillator was used to generate 2450 MHz microwaves because magnetrons are relatively inexpensive and widespread. We conducted transmission electron microscopy (TEM), atomic force microscopy (AFM), TEM-electron energy-loss spectroscopy (EELS), dynamic light scattering (DLS), and high-performance liquid chromatography (HPLC) measurements to analyze the calcium carbonate precipitates. Our findings showed the formation of string-like precipitates of calcium carbonate upon microwave irradiation from one direction, similar to those obtained using a semiconductor oscillator, as reported previously. This implied that the distribution of the frequency had little effect on the morphology. Furthermore, spherical precipitates were obtained upon microwave irradiation from two directions, indicating that the morphology could be controlled by varying the direction of microwave irradiation. Magnetrons are versatile and also used in large-scale production; thus, this method has potential in medical and industrial applications.
DOI： 10.3390/pr12071327
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Yohei Takashima, Naoto Tanabe, Shintaro Tanaka, Takaaki Tsuruoka, Kensuke Akamatsu
Crystal Growth & Design 24 ( 4 ) 1766 - 1773 2024年2月
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Direct Formation of ZIF-8 Crystal Thin Films on the Surface of a Zinc Ion-Doped Polymer Substrate 査読あり
Takaaki Tsuruoka, Kaito Araki, Kouga Kawauchi, Yohei Takashima, Kensuke Akamatsu
Inorganics 12 ( 1 ) 21 - 21 2024年1月
担当区分：筆頭著者, 責任著者 出版者・発行元：MDPI AG
Thin films of metal–organic frameworks (MOFs) on polymer substrates and MOF/polymer mixed-matrix membranes play crucial roles in advancing the field of gas separation membranes. In this paper, we present a novel method for the direct formation of continuous ZIF-8 crystal films on a polymer substrate doped with Zn²+. Our approach involves ion exchange between the doped zinc ions within the substrate and sodium ions in the presence of a CH3COONa additive, as well as interfacial complexation with eluted zinc ions and 2-methylimidazole (2-MeIM). The key factors affecting the formation of ZIF-8 crystals on the substrate were the concentrations of CH3COONa and 2-MeIM. A time-course analysis revealed that the nucleation rate during the early stages of the reaction significantly affected the surface morphology of the resulting ZIF-8 crystal films. Specifically, a higher nucleation rate led to the formation of continuous small ZIF-8 crystal films. This innovative approach enables the fabrication of densely packed, uniform ZIF-8 crystal films.
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Shunsuke Yamada, Yohei Takashima, Takaaki Tsuruoka, Kensuke Akamatsu
RSC Applied Interfaces 2024年
出版者・発行元：Royal Society of Chemistry (RSC)
An interfacial model has been developed for describing ion transport kinetics at the membrane/solution interface in the new solid-electrodeposition system.
DOI： 10.1039/d4lf00112e
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Asuka Nishibe, Ryohei Akiyoshi, Akinori Saeki, Kazuyoshi Ogasawara, Takaaki Tsuruoka, Daisuke Tanaka
Chemical Communications 2024年
出版者・発行元：Royal Society of Chemistry (RSC)
The impact of inorganic (–Cd–S–)<sub>n</sub> assemblies on semiconductive properties is demonstrated by systematically synthesizing one-dimensional Cd(ii) benzenethiolate coordination polymers.
DOI： 10.1039/d3cc05689a
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Ryosuke Fujiwara, Yuta Ikeda, Takuto Kawaguchi, Yohei Takashima, Takaaki Tsuruoka, Kensuke Akamatsu
Energies 17 ( 1 ) 190 - 190 2023年12月
出版者・発行元：MDPI AG
SnTe is the most widely studied p-type thermoelectric (TE) alternative to PbTe. In this study, we prepared a nanostructured SnTe bulk material via spark plasma sintering from a precursor synthesized by a chemical precipitation process without using organic molecules. The sintered sample comprised tiny grains (100–300 nm) with high-density grain boundaries. Eventually, because the material would contain no impurities acting as scattering nodes of charge carriers, the material exhibited a relatively high electrical conductivity of 7.07 × 105 Sm−1 at 310 K. The material demonstrated low lattice thermal conductivity (0.87 Wm−1K−1 at 764 K), which can be owing to the increasing phonon scattering at grain boundaries. The maximum ZT was 0.31 at 764 K in the measured temperature range. This study provides a method for the design of phase-pure and surfactant-free SnTe thermoelectric materials that exhibit low lattice thermal conductivity and high carrier mobility using a chemical synthetic approach.
DOI： 10.3390/en17010190
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High-performance bulk Bi0.4Sb1.6Te3.0 thermoelectrics prepared from nanocrystal precursor synthesized via chemical precipitation 査読あり
Ryosuke Fujiwara, Yohei Takashima, Takaaki Tsuruoka, Muneyuki Naito, Junya Murai, Kensuke Akamatsu
Journal of Solid State Chemistry 319 123777 - 123777 2023年3月
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Yohei Takashima, Seiko Tetsusashi, Shintaro Tanaka, Takaaki Tsuruoka, Kensuke Akamatsu
RSC Advances 13 ( 11 ) 7464 - 7467 2023年
出版者・発行元：Royal Society of Chemistry (RSC)
Polypyrrole-coated palladium nanoparticles could be directly generated inside a metal–organic frameworks. The resulting MOF composites exhibited higher semihydrogenation capability than the analog composite without polypyrrole coating.
DOI： 10.1039/d2ra08190c
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Yohei Takashima, Seiko Tetsusashi, Mai Takano, Shintaro Tanaka, Yui Murakami, Takaaki Tsuruoka, Kensuke Akamatsu
Dalton Transactions 52 ( 32 ) 11158 - 11162 2023年
出版者・発行元：Royal Society of Chemistry (RSC)
In this study, we demonstrated the direct synthesis of sodium dihydrogen phosphate (PA) containing palladium nanoparticles (PdNPs) supported on a metal–organic framework (MOF) for hydrogenation catalysis.
DOI： 10.1039/d2dt04109j
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Two-Dimensional Metal–Organic Framework-Based Cellular Scaffolds with High Protein Adsorption, Retention, and Replenishment Capabilities 査読あり
Tokitaka Katayama, Shintaro Tanaka, Takaaki Tsuruoka, Koji Nagahama
ACS Applied Materials & Interfaces 2022年8月
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Chemical synthesis of single nanometer-sized Bi2−xSbxTe3.0 nanocrystals via direct precipitation process 査読あり
Ryosuke Fujiwara, Yohei Takashima, Takaaki Tsuruoka, Muneyuki Naito, Junya Murai, Kensuke Akamatsu
Results in Chemistry 4 100485 - 100485 2022年1月
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Takaaki Tsuruoka, Yuri Miyashita, Ryuki Yoshino, Myu Fukuoka, Shoya Hirao, Yohei Takashima, Aude Demessence, Kensuke Akamatsu
RSC Advances 12 ( 6 ) 3716 - 3720 2022年
担当区分：筆頭著者, 責任著者 出版者・発行元：Royal Society of Chemistry (RSC)
We report an interfacial approach for fabricating coordination polymer (CP) crystal films and patterns on a polymer surface using a metal ion-doped polymer substrate.
DOI： 10.1039/d2ra00269h
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Cooperative catalysis in a metal–organic framework <i>via</i> post-synthetic immobilisation 査読あり
Yohei Takashima, Yuya Suwaki, Takaaki Tsuruoka, Kensuke Akamatsu
Dalton Transactions 51 ( 24 ) 9229 - 9232 2022年
出版者・発行元：Royal Society of Chemistry (RSC)
A Co-salen complex and a MOF were successfully hybridized by post-synthetic immobilization for a cooperative catalytic system.
DOI： 10.1039/d2dt01544g
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ポリイミド基板上への選択的金属有機構造体の形成技術
福岡美海、江口慧一、髙嶋洋平、赤松謙祐、鶴岡孝章
ポリイミドの高機能設計と応用技術 6 ( 6 ) 487 - 495 2022年
担当区分：責任著者
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Elemental composition control of gold-titania nanocomposites by site-specific mineralization using artificial peptides and DNA 査読あり
Makoto Ozaki, Takahito Imai, Takaaki Tsuruoka, Shungo Sakashita, Kin-ya Tomizaki, Kenji Usui
Communications Chemistry 2021年12月
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Controlling Interfacial Ion-Transport Kinetics Using Polyelectrolyte Membranes for Additive- and Effluent-free, High-Performance Electrodeposition 査読あり 国際誌
Kensuke Akamatsu, Shu-ichi Nakano, Koshi Kimura, Yohei Takashima, Takaaki Tsuruoka, Hidemi Nawafune, Yuki Sato, Junya Murai, Hiroshi Yanagimoto
ACS Applied Materials & Interfaces 13 ( 11 ) 13896 - 13906 2021年3月
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Shoya Hirao, Ruho Hamagami, Takashi Ohhashi, Keiichi Eguchi, Neo Kubo, Yohei Takashima, Kensuke Akamatsu, Takaaki Tsuruoka
CrystEngComm 23 ( 48 ) 8498 - 8505 2021年
担当区分：最終著者, 責任著者 出版者・発行元：Royal Society of Chemistry (RSC)
We investigate the structural transition of directly formed flexible MOF crystals on a polymer substrate.
DOI： 10.1039/d1ce01383a
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Precisely Controlled Reproducible Synthesis of Palladium Nanoparticles inside Metal-Organic Frameworks with H2 Gas as Reductant: Effects of Framework Crystallinity and H2 Gas 査読あり
Y. Takashima, Y. Sato, N.Kubo, T. Tsuruoka, K. Akamatsu
Chem. Lett 50 244 - 247 2021年
共著
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Intracellular mineralization of gold nanoparticles using gold ion-binding peptides with cell-penetrating ability 査読あり
Makoto Ozaki, Shuhei Yoshida, Takaaki Tsuruoka, Kenji Usui
Chemical Communications 2021年
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Competing Roles of Two Kinds of Ligand during Nonclassical Crystallization of Pillared-Layer Metal-Organic Frameworks Elucidated Using Microfluidic Systems
Yoko Tanaka, Yu Kitamura, Ryuji Kawano, Kan Shoji, Moe Hiratani, Tetsuo Honma, Hikaru Takaya, Hirofumi Yoshikawa, Takaaki Tsuruoka, Daisuke Tanaka
Chemistry - A European Journal 26 ( 41 ) 8889 - 8896 2020年7月
© 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim To diversify metal-organic frameworks (MOFs), multi-component MOFs constructed from more than two kinds of bridging ligand have been actively investigated due to the high degree of design freedom afforded by the combination of multiple ligands. Predicting the synthesis conditions for such MOFs requires an understanding of the crystallization mechanism, which has so far remained elusive. In this context, microflow systems are efficient tools for capturing non-equilibrium states as they facilitate precise and efficient mixing with reaction times that correspond to the distance from the mixing point, thus enabling reliable control of non-equilibrium crystallization processes. Herein, we prepared coordination polymers with pillared-layer structures and observed the intermediates in the syntheses with an in-situ measurement system that combines microflow reaction with UV/Vis and X-ray absorption fine-structure spectroscopies, thereby enabling their rapid nucleation to be monitored. Based on the results, a three-step nonclassical nucleation mechanism involving two kinds of intermediate is proposed.