Shun Yokoyama

Synthesis and Surface Control of Iron Metal Particles by Controlling the Metal Complexes in an Aqueous Solution

Hideyuki Takahashi, Koji Yokoyama, Shun Yokoyama

Magnetic beads which contain the magnetite species are widely applied for recovering process, such as the virus. These materials can also apply for the collection of toxic metal ions from wastewater. To increasing these abilities, in other word, to synthesize the high-performance …

Effect of oxidation treatment and UV irradiation of titanium on surface properties and yeast adhesion

Masaki Umetsu, Ryota Sekiai, Mei-Fang Chien, Shun Yokoyama et autres

In bioreactors that use microorganisms as catalysts, it is important to retain a high density of microorganisms on the support material. Initial adhesion of microorganisms is the first step in the formation of a robust biofilm. In this study, we evaluated the …

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Synthesis of Aggregation-Free Iron Metal Particles Using Amylopectin and Amylase in a Basic Aqueous Solution

Koji Yokoyama, Yuma Araya, Kaori Yokosaka, Shoichi Kumon et autres

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Dispersibility and Morphologically Controlled Synthesis Method of Fe Metal Particles By Utilizing the Metal Complexes in an Aqueous Solution

Hideyuki Takahashi, Koji Yokoyama, Shoichi Kumon, Kimitaka Sato et autres

Fe oxide based magnetic beads are widely used to recover the virus in an immunoprecipitation process. Moreover, these can also apply for using as the toxic metal ions recovery materials. To increasing these abilities, in other word, to synthesize the high-performance magnetic …

Verification of a frailty control program provided in a regional core hospital

Kohei Yamamoto, Shun Yokoyama, Yasuyoshi Ouchi

AIM: This study aimed to evaluate the validity of a frailty control program for the elderly at a newly established center. METHODS: The subjects were 30 patients who underwent training between January 2022 and January 2023 and who could be evaluated 3 …

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Ti compound coating of carbonyl iron particles with controlled surface conditions using a peroxotitanium acid solution for stable magnetic particles

Yuki Watanabe, Shun Yokoyama, Akira Kishimoto, Takahiro Ito et autres

The surface coating of carbonyl iron particles (CIPs) deposited under various surface conditions was examined using a peroxotitanium acid (PTA) solution including H2O2 to obtain highly stable magnetic particles. Upon adsorption on the CIP surfaces, peroxotitanium complexes dehydrated and transformed into TiO2 …

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Synthesis of low-cost multi-element Pt-based alloy nanoparticles as catalysts for the oxygen reduction reaction

Jhon L. Cuya Huaman, Kaneyuki Taniguchi, Daichi Iwata, Kōzō Shinoda et autres

alloy NPs were designed, and their catalytic properties as electrodes in the oxygen reduction reaction (ORR) were examined. Despite a low noble metal content of 22%, the catalytic performance and stability were superior to and comparable to those of commercial Pt NPs, …

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Synthesis of Aggregation-Free Metallic Iron Particles Using Amylopectin and Amylase in a Basic Aqueous Solution

Koji Yokoyama, Yuma Araya, Kaori Yokosaka, Shoichi Kumon et autres

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Formation mechanism of micro-sized Cu plates using Br ions as basal plane-specific adsorbent and their application in the preparation of highly conductive and flexible Cu films

Yusaku Noda, Shun Yokoyama, Takashi Itoh, Balachandran Jeyadevan

Micro-sized Cu plates were synthesized by chemically reducing Cu–Lactic acid complexes with ascorbic acid in the presence of Br − ions, under conditions in which oxide formation was completely suppressed in the reduction pathway.

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Morphological Control of Functional TiO2 Films on Magnetic Nanoparticle’s Surface by Utilizing the Boric Acid-Containing Solutions

Yūki Watanabe, Akira Kishimoto, Takahiro Ito, Masanobu Kawata et autres

In recent years, various functional materials are used for electronic devices such as the smartphones and conductive materials. For the further expansion of these material’s usability and usage range, it is important to achieve the highly functionalized material’s manufacturing processes compatible with …

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Effect of Oxidation Treatment and UV Irradiation of Titanium Surface on Yeast Adhesion

Masaki Umetsu, Ryota Sekiai, Mei-Fang Chien, Shun Yokoyama et autres

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Ambient Aqueous-Phase Synthesis of Highly Stable Methylammonium Tin Iodide Perovskites Using Alkali Iodides and Ascorbic Acid

Koji Yokoyama, Takahisa Omata, Shun Yokoyama, Hideyuki Takahashi

Tin iodide perovskites have attracted significant attention as lead-free photoactive layers with excellent optical and electrical properties. A high demand exists for their facile and green synthesis process, not including inert environments and anhydrous organic solvents. In this study, we report a …

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