Zobrazeno 1 - 10
of 17
pro vyhledávání: '"Yoshiteru Horikawa"'
Autor:
Hideaki Kitazawa, Masao Bounoshita, Shigetomo Matsuyama, Yoshiteru Horikawa, Kensei Ehara, Hiromu Sakurai, Kayori Takahashi, Shinichi Kinugasa
Publikováno v:
Metrologia. 52:8-16
A certified reference material (CRM) for poly(ethylene glycol) with no distribution in the degree of polymerization was developed. The degree of polymerization of the CRM was accurately determined to be 23. Supercritical fluid chromatography (SFC) wa
Autor:
Kensei Ehara, Shigetomo Matsuyama, Kayori Takahashi, Shinichi Kinugasa, Yoshiteru Horikawa, Rheo Takahashi
Publikováno v:
The Journal of Supercritical Fluids. 82:256-262
A synthetic polymer generally consists of a mixture of many compounds that share the same repeating unit but have different degrees of polymerization. Because of its ability to cope with a wide range of molecular weights, supercritical fluid chromato
Publikováno v:
The Journal of Supercritical Fluids. 46:206-210
To measure the Fourier transform infrared spectra of supercritical methanol at 523 K and pressures up to 30 MPa, the application of attenuated total reflectance optical cell is reported. Together with previously published transmittance infrared spect
Publikováno v:
Industrial & Engineering Chemistry Research. 44:2917-2920
It has been found that industrially important 4,4‘-dimethylbiphenyl can be produced with a maximum of 87% selectivity by the reaction between 4-methylbiphenyl and supercritical methanol over SAPO-1...
Publikováno v:
Journal of the Japan Petroleum Institute. 47:136-142
The applicability of supercritical methanol was investigated to the selective para methylation of 4-methylbiphenyl to produce 4,4'-dimethylbiphenyl, which has recently attracted much attention as a valuable monomer of thermotropic liquid crystals, en
Publikováno v:
Tetrahedron Letters. 44:5175-5178
In lipase-catalyzed asymmetrization of 1,3-propanediacetate no enantioselectivity was observed in conventional organic solvents, whereas in supercritical carbon dioxide (scCO2) enantioselectivities were observed up to 50% ee, which probably arose fro
Autor:
Takeshi Sako, Katsuto Otake, Masahiro Kato, Yoshihiro Takebayashi, Dmitry S. Bulgarevich, Yoshiteru Horikawa, Chiyoshi Kamizawa, Tsutomu Sugeta
Publikováno v:
Industrial & Engineering Chemistry Research. 41:2074-2081
UV/visible absorption spectroscopy was applied to measure the microscopic solvent dipolarity/polarizability, π*, and hydrogen-bond-acceptor basicity, β, parameters of supercritical CO2/n-alcohol mixtures. Experiments were conducted at 45 °C by var
Excess enthalpies of dibutyl ether + n-hexane + (n-heptane or n-octane) ternary mixtures at 298.15 K
Publikováno v:
Fluid Phase Equilibria. :311-320
Excess molar enthalpies, measured at 298.15 K in a flow microcalorimeter, are reported for the ternary mixtures (dibutyl ether+ n -hexane+ n -heptane) and (dibutyl ether+ n -hexane+ n -octane). Smooth representations of the results are described and
Publikováno v:
Fluid Phase Equilibria. 181:215-224
Excess molar enthalpies, measured at 298.15 K in a flow microcalorimeter, are reported for the ternary mixtures (diisopropyl ether+n-heptane+n-octane) and (diisopropyl ether+n-octane+n-dodecane). Smooth representations of the results are described an
Publikováno v:
Thermochimica Acta. 371:33-40
Microcalorimetric measurements of excess molar enthalpies, at 298.15 K are reported for the two ternary mixtures x 1 {CH 3 (CH 2 ) 3 } 2 O+ x 2 (CH 3 ) 3 CCH 2 CH(CH 3 ) 2 + x 3 CH 3 (CH 2 ) v CH 3 , where v =8 and 10. Smooth representations of the r