Abstract
Small-angle neutron scattering (SANS) experiments were carried out for three different systems, pure CO2, CO2 + methanol (1 mol%) and CO2 + ethanol (1 mol%), along the isotherm of 311.15 K in their supercritical states. All the SANS profiles were well analyzed with Ornstein-Zernike equation. With addition of the alcohols, the maximum values of the correlation length, ξ, and the scattering intensity at Q = 0, I(0), became larger, and the pressure at which ξ and I(0) became maxima was shifted to be lower. These changes can be explained qualitatively with van der Waals equation of state by regarding CO2 + alcohol mixture as a system consisting of a single kind of virtual molecules. From this analysis, both the molecular attractive interaction and volume are suggested to be increased in the mixture. These changes were considered to be strongly connected with the increase of solubility and selectivity on entrainer effect.
| Original language | English |
|---|---|
| Pages (from-to) | 102-106 |
| Number of pages | 5 |
| Journal | Journal of Molecular Liquids |
| Volume | 147 |
| Issue number | 1-2 |
| DOIs | |
| Publication status | Published - Jul 20 2009 |
| Externally published | Yes |
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Keywords
- Entrainer effect
- Small-angle neutron scattering
- Supercritical carbon dioxide
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Spectroscopy
- Condensed Matter Physics
- Atomic and Molecular Physics, and Optics
- Electronic, Optical and Magnetic Materials
- Materials Chemistry
Cite this
Structural investigation on supercritical carbon dioxide and its mixture with alcohol. / Sato, Takashi; Sugiyama, Masaaki; Misawa, Masakatsu; Hamada, Kei; Itoh, Keiji; Mori, Kazuhiro; Fukunaga, Toshiharu.
In: Journal of Molecular Liquids, Vol. 147, No. 1-2, 20.07.2009, p. 102-106.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Structural investigation on supercritical carbon dioxide and its mixture with alcohol
AU - Sato, Takashi
AU - Sugiyama, Masaaki
AU - Misawa, Masakatsu
AU - Hamada, Kei
AU - Itoh, Keiji
AU - Mori, Kazuhiro
AU - Fukunaga, Toshiharu
PY - 2009/7/20
Y1 - 2009/7/20
N2 - Small-angle neutron scattering (SANS) experiments were carried out for three different systems, pure CO2, CO2 + methanol (1 mol%) and CO2 + ethanol (1 mol%), along the isotherm of 311.15 K in their supercritical states. All the SANS profiles were well analyzed with Ornstein-Zernike equation. With addition of the alcohols, the maximum values of the correlation length, ξ, and the scattering intensity at Q = 0, I(0), became larger, and the pressure at which ξ and I(0) became maxima was shifted to be lower. These changes can be explained qualitatively with van der Waals equation of state by regarding CO2 + alcohol mixture as a system consisting of a single kind of virtual molecules. From this analysis, both the molecular attractive interaction and volume are suggested to be increased in the mixture. These changes were considered to be strongly connected with the increase of solubility and selectivity on entrainer effect.
AB - Small-angle neutron scattering (SANS) experiments were carried out for three different systems, pure CO2, CO2 + methanol (1 mol%) and CO2 + ethanol (1 mol%), along the isotherm of 311.15 K in their supercritical states. All the SANS profiles were well analyzed with Ornstein-Zernike equation. With addition of the alcohols, the maximum values of the correlation length, ξ, and the scattering intensity at Q = 0, I(0), became larger, and the pressure at which ξ and I(0) became maxima was shifted to be lower. These changes can be explained qualitatively with van der Waals equation of state by regarding CO2 + alcohol mixture as a system consisting of a single kind of virtual molecules. From this analysis, both the molecular attractive interaction and volume are suggested to be increased in the mixture. These changes were considered to be strongly connected with the increase of solubility and selectivity on entrainer effect.
KW - Entrainer effect
KW - Small-angle neutron scattering
KW - Supercritical carbon dioxide
UR - http://www.scopus.com/inward/record.url?scp=67349270239&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=67349270239&partnerID=8YFLogxK
U2 - 10.1016/j.molliq.2008.06.017
DO - 10.1016/j.molliq.2008.06.017
M3 - Article
AN - SCOPUS:67349270239
VL - 147
SP - 102
EP - 106
JO - Journal of Molecular Liquids
JF - Journal of Molecular Liquids
SN - 0167-7322
IS - 1-2
ER -