Masakazu Murase

Toyota Central Research and Development Laboratories (Japan)

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Yasutomo Goto

Toyota Central Research and Development Laboratories (Japan)

Yuri Yamada

Toyota Central Research and Development Laboratories (Japan)

Norihiro Mizoshita

Toyota Central Research and Development Laboratories (Japan)

Takeshi Uyama

Toyota Central Research and Development Laboratories (Japan)

Naonari Sakamoto

Toyota Central Research and Development Laboratories (Japan)

Takeo Arai

Toyota Central Research and Development Laboratories (Japan)

Takamasa Nonaka

Toyota Central Research and Development Laboratories (Japan)

Masataka Ohashi

Toyota Central Research and Development Laboratories (Japan)

Riichiro Ohta

Toyota Central Research and Development Laboratories (Japan)

Yoshifumi Maegawa

Toyota Central Research and Development Laboratories (Japan)

Cooperative Institutions

Toyota Central Research and Development Laboratories (Japan)

Toyota Motor Corporation (Switzerland)

Nagoya University

Japan Science and Technology Agency

Osaka Prefecture University

Tokyo Institute of Technology

The University of Tokyo

Osaka University

Tohoku University

Aichi University

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Electrochemical CO2 Fixation and Release Cycle Featuring a Trinuclear Zinc Complex for Direct Air Capture

Angewandte Chemie International Edition (2024)

Masakazu Murase Naonari Sakamoto Takeshi Uyama Takamasa Nonaka Masataka Ohashi

CO2 capture technology can mitigate greenhouse gas emissions and global warming. CO2 capture driven by electrochemical reactions is attractive because the operation is carried out at normal temperature and pressure and involves a simple input system using electrical energy. Although promising metal complexes with high CO2 fixation performance have been reported, there are few studies on systems that combine electrochemical reactions and metal complexes. Here, we demonstrated stable CO2 fixation‐release cycles using an electrochemical system with trinuclear Zn(II) complex (Zn3L) as the CO2 fixative and an ionic liquid as a supporting electrolyte for the stable operation. This system showed a faster CO2 fixation rate than that of an aqueous alkaline solution at the same concentration. Continuous release and refixation of CO2 were achieved by decomposition and reconstruction of the complex structure induced by H+ and OH− supplied from a bipolar membrane equipped in the electrolytic cell. The CO2 fixation‐release cycle was demonstrated even for dilute CO2 (450 ppm) in air, where the CO2 capture rate reached approximately 46% of CO2 contained in the air under an air flow condition of 200 mL⸱min−1. This case, combining electrochemical drive and metal complexes, will provide a new option for CO2 capture technology.

Carbon fixation

10.1002/anie.202420703

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Adsorption Index Based on Hansen Solubility Parameters of Solutes, Solvents, and a Solid Surface and Its Application to Laser Desorption/Ionization Mass Spectrometry

Bulletin of the Chemical Society of Japan (2022)

Masakazu Murase Yuri Yamada Yasutomo Goto Norihiro Mizoshita

Hansen solubility parameters (HSP) are useful for understanding the solubility and dispersibility of substances in liquids. This study aims at utilizing HSP to describe the affinity between solutes and solid surfaces in solutions. For this purpose, we designed the index “H” based on the HSP theory for predicting the adsorption behavior. In this study, the adsorption index H was used to estimate the desirable solvent compositions for preparing samples for laser desorption/ionization mass spectrometry (LDI-MS). The compositions for obtaining a high-intensity signal of analytes were estimated by selecting an appropriate H value from the relationship between the H and the solubility of the analytes predicted from the HSP. Four different pesticides (analytes) adsorbed on an organosilica film (LDI-MS substrate) were detected with high-intensity signals using the estimated solvent compositions. This study shows that the H is a useful parameter in the design of sample solutions for obtaining high-intensity signals in LDI-MS. Moreover, it is potentially useful for other applications that utilize molecular adsorption on solid surfaces. An index “H” for predicting the adsorption behavior of solutes on a solid surface in a solution was designed based on the Hansen solubility parameters and was utilized in laser desorption/ionization mass spectrometry (LDI-MS). The solute molecules adsorbed on the LDI substrate were detected as high-intensity signals using the solvent composition estimated from the H.

Hildebrand solubility parameter

10.1246/bcsj.20220117

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Prediction of Molecular Affinity on Solid Surfaces via Three-Dimensional Solubility Parameters Using Interfacial Free Energy as Interaction Threshold

The Journal of Physical Chemistry (2019)

Masakazu Murase Riichiro Ohta

Various adhesive and wetting phenomena in nature and practical applications originate from the interaction between the surfaces of materials and other substances. In this study, we developed a method for calculating the Hansen solubility parameters (HSP) of the surface of the solid materials to elucidate the surface interaction by quantitatively and visually representing adsorptivity with a three-dimensional vector. The HSP were derived from the interfacial free energy, which can easily be calculated from the contact angles of three organic solvents on the solid materials. The HSP for a glassy carbon (GC) surface calculated using our method were correlated with the adsorptivity on the GC surface of several organic molecules. The adsorptivity was evaluated using electrochemical impedance spectroscopy and molecular mechanics simulations; the latter of which also revealed that the HSP calculated for the Pt surface were highly correlated with its interactivity. Moreover, the HSP of the polytetrafluoroethylene (PTFE) surface obtained herein appropriately reflect the molecular structure of PTFE. The results underpin that our method enables the elucidation of various surface phenomena involving noncovalent interaction and allows the affinity between solid surfaces and tens of thousands of substances recorded in the HSP database to be predicted.

Solid surface

Molecular mechanics

Interaction energy

Source

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Direct nanoimprinting of nanoporous organosilica films consisting of covalently crosslinked photofunctional frameworks

Nanoscale (2020)

Norihiro Mizoshita Yuri Yamada Masakazu Murase Yasutomo Goto Shinji Inagaki

Nanoimprinting methods have been used widely to prepare various patterned or nanostructured thin films from inorganic or organic components. However, the accumulation of large functional aromatic groups in covalently crosslinked nanoimprints is challenging, due to the difficulty in controlling the fluidity and reactivity of the precursor films. In this work, nanoimprinting of naphthalimide-silica sol-gel films results in vertically oriented nanoporous structures consisting of covalently crosslinked UV-absorbing frameworks. The nanoimprinted films demonstrate potential as robust analytical substrates for laser desorption/ionization mass spectrometry (LDI-MS). The sol-gel polycondensation behavior of the precursors is examined using 29Si NMR spectroscopy to determine reaction conditions suitable for nanoimprinting. The inorganic-organic hybrid frameworks containing a high density of naphthalimide groups exhibit small volume shrinkage during the polycondensation reactions, which leads to desired nanoimprinting. Various bio-related compounds on the order of picomole to femtomole quantities are detectable by LDI-MS measurements using the nanoimprinted substrates. To improve their user-friendliness and signal intensity in LDI-MS analysis, the nanoimprinted substrates are patterned with surface-modified silica nanoparticles. The direct formation of surface nanostructures by nanoimprinting of functional organosilica films may open a new path to developing optically and electronically functional materials, thereby widening their utility.

Nanoporous

10.1039/d0nr03272g

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Novel Noble-Metal-Free Electrocatalyst for Oxygen Evolution Reaction in Acidic and Alkaline Media

Electrocatalysis (2015)

Nobuaki Suzuki Takafumi Horie G. Kitahara Masakazu Murase Kazuma Shinozaki

Phosphide

Oxygen evolution

Noble metal

10.1007/s12678-015-0288-4

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Nanostructured organosilicas constructed by homopolycondensation of a transesterified bulky precursor and their potential in laser desorption/ionization

Materials Chemistry Frontiers (2020)

Norihiro Mizoshita Masakazu Murase Yuri Yamada Yasutomo Goto

Homopolycondensation of bulky organosilane precursors transesterified with oxyethylene-containing alcohols results in nanostructured organosilica particles suitable for functional applications that require efficient light absorption.

10.1039/d0qm00667j

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Combinatorial study of the phase development of sputtered Pb(Zr,Ti)O₃ films

Japanese Journal of Applied Physics (2020)

Masakazu Murase Takeshi Yoshimura Norifumi Fujimura

For a comprehensive study of the growth mechanisms of Pb(Zr,Ti)O3 (PZT), we employed a combinatorial sputtering method that enabled us to fabricate films with composition and substrate temperature gradients in-plane. The gradient of the amount of Pb supply was created using PZT ceramic and Pb3O4 powder targets. The substrate temperature gradient was generated in an orthogonal direction by inserting a shadow mask between the heater and substrate. The PZT film was deposited on uniformly deposited (001)LaNiO3/Si in a substrate temperature range of 490 °C–570 °C. It was determined that although the growth condition of PZT films has a relatively large process window, the orientation is easily changed by the temperature and the amount of Pb supply. In addition, the range of the growth temperature, where the films show ferroelectricity decreases with decreasing the amount of Pb supply.

Atmospheric temperature range

10.35848/1347-4065/abb4c0

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Perfluoroalkyl Group-Covered Organosilica Films for the Sensitive Detection of Sulfonylurea Herbicides in Laser Desorption/Ionization Mass Spectrometry

Journal of Agricultural and Food Chemistry (2023)

Yuri Yamada Masakazu Murase Yasutomo Goto Norihiro Mizoshita

Simple and rapid screening of agrochemicals greatly contributes to food and environmental safety. Matrix-free laser desorption/ionization mass spectrometry (LDI-MS) is an effective tool for high-throughput analysis of low-molecular-weight compounds. In this study, we report a UV-laser-absorbing organosilica film for the sensitive detection of various sulfonylurea herbicides using LDI-MS. Organosilica films with fluoroalkyl groups on the organic part are fabricated, followed by additional modification of the silica moiety with a fluoroalkyl coupling agent to cover the film surface with hydrophobic fluoroalkyl groups. Nanoimprinting is conducted to impart nanostructures on the film surface to enhance the LDI performance. The fabricated nanostructured organosilica films accomplish sensitive detection of cyclosulfamuron and azimsulfuron at concentrations as low as 1 fmol μL–1. The applicability of the nanostructured organosilica films is confirmed by the recovery of cyclosulfamuron and ethametsulfuron-methyl from pea sprouts (Pisum sativum) hydroponically grown in herbicide-spiked water at concentrations of 0.5 ppm.

Sulfonylurea

Surface Modification

10.1021/acs.jafc.2c09077

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Citations (10)

Study on Capillary Pump Loop(CPL) for Space Use. Characteristics and Peformance Test of CPL Using Two Flat-Plate-Type Evaporators.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B (1996)

Masahumi KATSUTA Masayuki Matsushita Masakazu Murase Katsuya NAGATA Kiyoshi Tanaka

The capillary pump loop (CPL), which employs the latent heat of vaporization and condensation and does not need a driving source, is considered as a promising candidate for space thermal control systems because of its high reliability and lightness. In this study, the performance and characteristics tests using a prototype CPL model which has two flat-type evaporators and a reservoir as an operational control device was made. To withstand the wide range of heat loads in space applications, two tests, one conducted under an even heat load and the other under an uneven heat load, were performed. In these experiments, our interest was focused on the region where we can get stable operations, heat transfer mechanisms at the evaporator section and controllability of the reservoir. In order to investigate in greater detail the flow behavior of working fluid inside the evaporator section, visual observation was also carried out using a transparency loop. As a result, an important fundamental data base required for the establishment of the theoretical prediction of CPL performance was obtained.

Working fluid

10.1299/kikaib.62.2021

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Enhancement of Mechanical Properties of High-Thermal-Conductivity Composites Comprising Boron Nitride and Poly(methyl methacrylate) Resin through Material Design Utilizing Hansen Solubility Parameters

ACS Applied Materials & Interfaces (2024)

Yumi Inagaki Masakazu Murase Hiromitsu Tanaka Daisuke Nakamura

Materials for heat sinks in automotive heat dissipation systems must demonstrate both high thermal conductivity and stress resistance during assembly. This research proposes a composite material, comprised of thermally conductive ceramic fillers and matrix resins, as a suitable option for such application. The strategy for designing this material interface is directed with Hansen solubility parameters (HSP). A composite material featuring a honeycomb-like structure made of poly(methyl methacrylate) (PMMA) and boron nitride (BN) particles was successfully fabricated through press molding. This yielded a continuous BN network exhibiting high thermal conductivity and moderate mechanical strength. The HSP evaluation led to the suggestion of introducing highly polar functional groups into the matrix resin to enhance the affinity between PMMA resin and BN fillers. In line with this recommendation, a nitrile (CN) group─a highly polar group─was introduced to PMMA (CN-PMMA), significantly enhancing the composite's maximum bending stress without noticeably degrading other properties. Surface HSP evaluation through contact angle measurements revealed an "interface enrichment effect", with the CN groups concentrating at the resin―filler interface and effectively interacting with the surface functional groups on the BN particles, which resulted in an increase in the maximum bending stress. These findings emphasize the advantage of employing HSP methodologies in designing high-performance composite materials.

Poly(N-isopropylacrylamide)

Hildebrand solubility parameter

10.1021/acsami.4c00626

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Citations (2)