Self-diffusion coefficients for water and organic solvents in extremely low-density supercritical states

被引:9
作者
Yoshida, Ken [1 ,2 ]
Matubayasi, Nobuyuki [1 ,3 ]
Nakahara, Masaru [1 ]
机构
[1] Kyoto Univ, Inst Chem Res, Kyoto 6110011, Japan
[2] Univ Pittsburgh, Sch Med, Dept Anesthesiol, Pittsburgh, PA 15260 USA
[3] CREST, Japan Sci & Technol Agcy JST, Kawaguchi, Saitama 3320012, Japan
关键词
Self-diffusion; Supercritical fluids; High-temperance NMR; Gas kinetic theory; BENZENE DIMER; NMR; ENERGIES; MODEL;
D O I
10.1016/j.molliq.2008.10.006
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Self-diffusion coefficients D for benzene and cyclohexane are determined by using the proton pulsed-field-gradient spin echo (PGSE) method at high temperatures of 150-400 degrees C and in the low-density (0.007-0.21 and 0.005-0.15 g cm(-3) for benzene and cyclohexane, respectively), one-phase region. For benzene, the density-diffusivity product in the zero-density limit divided by the square root of the absolute temperature, (rho D)(0)/root T is smaller than that of the hard sphere model at 150-400 degrees C and decreases with lowering temperature as a reflection of the attractive interaction effect. The (rho D)(0)/root T for cyclohexane is comparable to the hard-sphere value and its temperature dependence is smaller than that for benzene, showing that the effect of the attractive interaction is stronger for benzene than for cyclohexane. The dynamic effect of the hydrogen bonding is discussed through comparison to our previous results on water [J. Chem. Phys., 125. 074307 (2006); J. Chem. Phys. 126. 089901 (2007)]. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:96 / 101
页数:6
相关论文
共 23 条
[1]  
[Anonymous], 1953, The Mathematical Theory of Non-Uniform Gases
[2]   NMR study of liquid and supercritical benzene [J].
Asahi, N ;
Nakamura, Y .
BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 1997, 101 (05) :831-836
[3]   HIGH-PRESSURE NUCLEAR-MAGNETIC-RESONANCE MEASUREMENT OF SPIN-LATTICE RELAXATION AND SELF-DIFFUSION IN CARBON-DIOXIDE [J].
ETESSE, P ;
ZEGA, JA ;
KOBAYASHI, R .
JOURNAL OF CHEMICAL PHYSICS, 1992, 97 (03) :2022-2029
[5]  
HANSEN JP, 1976, THEORY SIMPLE LIQUID, pCH7
[6]  
Hirschfelder J. O., 1954, Molecular Theory of Gases and Liquids
[7]   NMR-STUDY OF COMPRESSED SUPERCRITICAL WATER [J].
LAMB, WJ ;
JONAS, J .
JOURNAL OF CHEMICAL PHYSICS, 1981, 74 (02) :913-921
[8]  
MCQUARRIE EA, 1976, STAT MECH, pCH19
[9]   Accurate ab initio binding energies of the benzene dimer [J].
Park, YC ;
Lee, JS .
JOURNAL OF PHYSICAL CHEMISTRY A, 2006, 110 (15) :5091-5095
[10]   AN NMR SPIN-ECHO STUDY OF SELF-DIFFUSION IN XENON [J].
PEEREBOOM, PWE ;
LUIGJES, H ;
PRINS, KO .
PHYSICA A, 1989, 156 (01) :260-276