Kiwamu Sue

Automated vibrating-tube densimeter for high-temperature and high-pressure solvent mixtures with continuous composition scanning

Takumi Ono, Yoshihiro Takebayashi, Takeshi Furuya, Kiwamu Sue

An automated vibrating-tube densimeter was developed for solvent mixtures at elevated temperatures and pressures, and was employed to measure the density of ethanol-water mixture at 250°C and 15, 20, 30, and 40 MPa as a continuous function of the composition over the …

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Nanocellular foaming of poly (methyl methacrylate) with hydrofluoroolefin (HFO)/CO2 binary mixtures

Takumi Ono, Satoshi Yoda, Yoshihiro Takebayashi, Kiwamu Sue

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Automated Column-Flow Reactor with Inline Spectrometers for the Residence Time Measurement and Kinetic Analysis of ZrO 2 -Catalyzed Direct Ester Amidation

Tsutomu Chida, Yoshihiro Takebayashi, Kiwamu Sue, Sho Kataoka

An automated column-flow reactor equipped with inline infrared and near-infrared spectrometers was developed to investigate the ZrO 2 -catalyzed direct amidation of methyl benzoate with n -butylamine in diglyme at 140 to 170 °C. Residence time distribution measurement at various flow rates …

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Author response for "Data-driven approach for modeling of ball-milled dispersion of BaTiO3 nanoparticles"

Takumi Ono, Tarojiro Matsumura, Kiwamu Sue, Satoru Takeshita

Effect of supercritical CO2-induced crystallization and porosity on the dielectric behavior of polycarbonate

Seisuke Ata, Kiwamu Sue

Polycarbonate (PC) is a promising candidate for use as a porous resin, but its heat resistance must be improved to broaden its applicability. Such improvement could be achieved by controlling the crystallinity and porosity of PC through foaming with a supercritical gas. …

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A data-driven approach for the modeling of a ball-milled dispersion of BaTiO 3 nanoparticles

Takumi Ono, Tarojiro Matsumura, Kiwamu Sue, Satoru Takeshita

Wet-state ball milling of ceramic nanoparticles is analyzed by machine learning and machine-learning-assisted model formulation. A linear model formula is constructed from the high-impact input features revealed in the machine learning. The formula explains the relation between the ball-milling conditions and hydrodynamic …

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Investigation of Phase Transition for BaTiO 3 Nanoparticles Using a Laboratory-Grade High-Temperature X-ray Diffractometer

Tetsuhiro Katsumata, Hiroshi Takashima, Takumi Ono, Kiwamu Sue

(BTO) nanoparticles with a size of 12 nm were prepared, and their phase transition behavior was investigated using a laboratory-grade high-temperature X-ray diffractometer. The {111}, {200}, and {220} reflections were measured carefully, and Full Width at Half Maximum (fwhm) of these reflections …

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Fabrication of BaTiO3 nanocrystalline films and evaluation of dielectric properties

Hiroshi Takashima, Tetsuhiro Katsumata, Takumi Ono, Kiwamu Sue

Abstract We developed a paste using commercially available BaTiO3 nanoparticles (average particle diameter of 146 nm) and prepared freestanding films 2 × 2 cm in size using a simple screen printing method with high reproducibility. The dielectric properties of the resulting freestanding …

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Preparation of freestanding films using Pr‐doped CaSrTiO 3 nanoparticles prepared by supercritical hydrothermal synthesis

Hiroshi Takashima, Kiwamu Sue

Abstract We developed a paste of praseodymium‐doped calcium strontium titanium oxide perovskite phosphor nanoparticles prepared by supercritical hydrothermal synthesis and successfully prepared freestanding films using simple screen printing. In addition, when investigating the luminescence properties of the obtained films and sintered freestanding …

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Correction: Combination of near-infrared spectroscopy and a transient flow method for efficient kinetic analysis of the Claisen rearrangement

Yoshihiro Takebayashi, Kiwamu Sue, Sho Kataoka

Correction for ‘Combination of near-infrared spectroscopy and a transient flow method for efficient kinetic analysis of the Claisen rearrangement’ by Yoshihiro Takebayashi et al. , React. Chem. Eng. , 2024, 9 , 2975–2983, https://doi.org/10.1039/D4RE00301B.

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Investigation of Phase Transition for BaTiO3 Nanoparticles By High-Temperature X-Ray Diffraction

Tetsuhiro Katsumata, Hiroshi Takashima, Kiwamu Sue

A piezocatalyst is a piezoelectric utilized to drive chemical redox reactions. The piezoelectric produces electro charges (electrons and holes) by applying mechanical stress, and these charged charges assist in the chemical redox reactions. A nanoparticle of a typical ferroelectric compound BaTiO3 (nano-BTO) …

Preparation of Freestanding Films Using Barium Titanate Nanoparticles and Their Electrical and Optical Properties

Hiroshi Takashima, Tetsuhiro Katsumata, Yoshihiro Takebayashi, Takumi Ono et autres

BaTiO3 ferroelectric perovskites have been applied to a variety of applications, including multilayer ceramic capacitors (MLCC), piezoelectric transducers, actuators, thermistors with positive temperature coefficient, and ultrasonic devices. In the development of MLCC manufacturing processes, understanding the relationship between the particle size and …