A5050080287- Phase Equilibria and Thermodynamics
- Polymer Foaming and Composites
- Ionic liquids properties and applications
- Thermodynamic properties of mixtures
- Semiconductor materials and devices
- Silicon and Solar Cell Technologies
- Analytical Chemistry and Chromatography
- Catalysis and Oxidation Reactions
- Adsorption, diffusion, and thermodynamic properties of materials
- Catalytic Processes in Materials Science
- Chemical Thermodynamics and Molecular Structure
- Carbon Dioxide Capture Technologies
- Polymer crystallization and properties
- High-Temperature Coating Behaviors
- Subcritical and Supercritical Water Processes
- CO2 Sequestration and Geologic Interactions
- Carbon dioxide utilization in catalysis
- Chemical and Physical Properties in Aqueous Solutions
- Transition Metal Oxide Nanomaterials
- Integrated Circuits and Semiconductor Failure Analysis
- biodegradable polymer synthesis and properties
- Methane Hydrates and Related Phenomena
- Nuclear Materials and Properties
- ZnO doping and properties
- Intermetallics and Advanced Alloy Properties
Takenaka (Japan)
2016-2025
Tohoku Institute of Technology
2019-2025
Japan Atomic Energy Agency
2014-2024
Tokyo University of Science
2022-2024
Tohoku University
2014-2023
Akita University
2002-2022
Materials Science & Engineering
1998-2022
Ohta Nishinouchi Hospital
2022
Fukushima Medical University
2006-2019
Shinmatsudo Central General Hospital
2012-2018
Abstract CH 4 –CO 2 replacement in hydrate with high pressure CO was studied in‐situ laser Raman spectroscopy at 273.2 K and initial pressures of 3.2, 5.4, 6.0 MPa. Replacement rates increased increasing up to 3.6 MPa did not change higher (∼6.0 MPa). These results showed that the were dependent on phase conditions driving force being strongly related fugacity differences two guest components between fluid phases. When contacted under flow conditions, measurements cage decomposition...
The solubility and diffusion coefficient of carbon dioxide in the biodegradable polymers poly(butylene succinate) succinate-co-adipate) were measured at temperatures from 323.15 to 453.15 K pressures up 20 MPa. solubilities polymer's molten state increased linearly with pressure decreased temperature. Solubilities could be correlated within 2.2% by Sanchez−Lacombe equation conjunction a temperature-dependent interaction parameter. was also found applicable correlation semicrystalline state....
Pure component pressure−volume−temperature (pVT) data for five imidazolium-based ionic liquids, 1-ethyl-3-methylimidazolium hexafluorophosphate [emim][PF6], 1-hexyl-3-methylimidazolium [hmim][PF6], 1-octyl-3-methylimidazolium [omim][PF6], tetrafluoroborate [emim][BF4], and [hmim][BF4], were measured with a bellows type apparatus. High-pressure densities of liquids showed smooth trends temperature pressure variations except [emim][PF6] which exhibited solid phase transition at temperatures...
Pressure−density−temperature (pρT) data for three types of ionic liquid, [emim][lactate], [(C2H4OH)(CH3)3N][lactate], and [bmim][Cl], were measured with a bellows type dilatometer at temperatures up to 452 K pressures 200 MPa. The Tait equation could correlate the density as function temperature pressure within an average relative deviation (ARD) 0.014 %. thermal expansion coefficients isothermal compressibilities estimated equation, their variations pressure, dα p /dT dk T /dp, found be...
A highly CO2-tolerant green alga, Chlorococcum littorale, was investigated at temperatures ranging from 8 to 28 °C, light intensities 30 170 μmol m-2 s-1, a constant CO2 concentration of 5% (v/v) and atmospheric pressure. The experimental results showed that specific growth rate μ, defined in terms cell under logarithmic phase, increased with temperature up the maximum value (ca. 22 °C), while μ decreased higher temperatures. These promotion inhibition were expressed by both multiple linear...
High pressure densities at (10–200) MPa over a range of temperatures and atmospheric viscosities (293–373) K for three ionic liquids (ILs) that are able to dissolve biomass, 1-ethyl-3-methylimidazolium methylphosphate ([emim][MP]), diethylphosphate ([emim][DEP]), 1-butyl-3-methylimidazolium acetate ([bmim][Ac]) reported. Densities the IL bis(trifluoromethylsulfonyl)imide ([bmim][Tf2N]) were measured same conditions verify apparatus extend present data. The high [emim][MP] [emim][DEP] newly...
Atmospheric densities and viscosities of ionic liquids, 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C6C1Im][Tf2N]) chloride ([C6C1Im][Cl]), were measured with a Stabinger viscometer at temperatures from (293 to 373) K. High-pressure (p ≤ 200 MPa) for [C6C1Im][Tf2N] [C6C1Im][Cl] bellows type apparatus (312 452) Samples analyzed the water 1-methylimidazole content before after measurements. For [C6C1Im][Tf2N], combined expanded uncertainties estimated be (1.0 1.8) kg·m–3...
A methodology is presented that allows hazardous dipolar aprotic solvents used in the pharmaceutical processing industries to be replaced with solvent-pair mixtures consist of a hydrogen-bond donor (HBD) solvent and acceptor (HBA) solvent. The uses solubility active ingredient (API) estimate range required parameters Kamlet–Taft for API then intersects these ranges identify favorable pairs possible working compositions. Solvent are ranked according GSK safety health scores. was applied 13...
The solubilities of methanol, ethanol, propanol, 2-propanol, butanol, 2-butanol, 2-methyl-1-propanol, acetone, methyl ethyl ketone, acetate, and propyl acetate in cis-1,4-polyisoprene, polyisobutylene, poly(n-butyl methacrylate), poly(vinyl acetate) were measured by the piezoelectric quartz crystal microbalance method at four temperatures (293.2, 313.2, 333.2, 353.2) K. In this work, crystals that installed an equilibrium cell enabled multiple solubility measurements. Estimated uncertainties...
Abstract Binary H 2 ‐THF clathrate hydrate formation kinetics were investigated with a pressure decay method at temperatures from 266.7 to 275.1 K, initial pressures 3.6 8.4 MPa, and stoichiometric THF concentrations for particle sizes between 212 1,400 μm. Formation rate increased smaller sizes, higher lower‐temperatures. A hydrogen delocalization model proposed phase diffusion (HHPD) used analyze the mechanisms. The HHPD assumes that is formed due adsorption onto surface followed by...
Phase equilibrium data for H2 + tetrahydrofuran (THF) and cyclopentane (CP) binary clathrate hydrate systems were determined from temperature pressure measurements with a newly designed semimicro (≈ 0.78 cm3) cell. The range of conditions studied the two was at pressures (2 to 14) MPa temperatures (278 285) K. Inclusion characteristics hydrogen molecules both similar according their Raman spectra. measured THF system in agreement some literature. New phase spectroscopy analyses CP are...
Mixtures of safe and renewable solvents can replace hazardous presently being used in the manufacture engineering plastics. In this work, a methodology is proposed for identifying solvent-pair mixtures preparing polymer precursors, with poly(amic acid) (PAA) studied as an example. The uses chemical safety index, Hansen solubility parameters Kamlet–Taft solvatochromic pure to identify hydrogen bond acceptor (HBA)–hydrogen donor (HBD) combinations. Ten replacement solvent-pairs PAA syntheses...
An apparatus for measuring the pressure—volume—temperature (PVT) properties of polymers using a metal bellows has been developed at temperatures from 313 to 623 K and pressures up 200 MPa. A calibration device was performed by PVT mercury water. The experimental uncertainty specific volumes estimated be within ±0.2%, while that ±0.1 below 300°C ±0.3 above 300°C. MPa 100 ±0.25 polypropylene polycarbonate were measured in temperature ranges 40 330°C, respectively, 10 effects sample cup forms...
Kamlet-Taft solvatochromic parameters (polarity, basicity, acidity) of hydrogen bond donor (HBD)/acceptor (HBA) mixed-solvent systems, water (H2O)-γ-valerolactone (GVL), methanol (MeOH)-GVL, ethanol (EtOH)-GVL, H2O-γ-butyrolactone (GBL), MeOH-GBL, and EtOH-GBL, were measured over their entire composition region at 25 °C using UV-vis spectroscopy. Basicity H2O-GVL H2O-GBL systems exhibited positive deviation from ideality synergism in the basicity values. The cybotactic around each indicator...