Corresponding states analysis of the critical points in binary solutions of room temperature ionic liquids

被引:133
作者
Wagner, M [1 ]
Stanga, O [1 ]
Schröer, W [1 ]
机构
[1] Univ Bremen, Inst Anorgan & Phys Chem, D-28359 Bremen, Germany
关键词
D O I
10.1039/b305959f
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
A systematic study of liquid-liquid phase transitions in mixtures of room temperature ionic liquids (RTIL) with nonionic solvents of different dielectric constant is presented. We report phase diagrams and the location of the critical points in the binary systems. The salts are 1-alkyl-3-methylimidazolium tetrafluoroborates and hexafluorophosphates with butyl-, hexyl-, octyl- side chains. The solvents are water, n-alcohols (n = 1 - 16), branched alcohols, and dialcohols. A corresponding state analysis of the data is carried out in terms of the variables of the restricted primitive model (RPM), which considers ionic fluids as equal-sized charged hard spheres in a dielectric continuum. The reduced critical temperatures are found to depend almost linearly on the dielectric constant of the solvent. The data of all investigated systems are represented by a master plot, which indicates a continuous crossover from a Coulomb driven phase transition, reasonably described by the RPM, towards a phase transition determined by hydrophobic interactions.
引用
收藏
页码:3943 / 3950
页数:8
相关论文
共 72 条
[1]  
Anisimov M., 2000, Exp. Thermodyn., V5, P381
[2]  
ANISIMOV MA, IN PRESS PHYSICAL CH
[3]  
Anisimov MA, 1991, CRITICAL PHENOMENA L
[4]  
[Anonymous], 1984, THEORY MOL FLUIDS FU, DOI DOI 10.1093/OSO/9780198556022.001.0001
[5]   ELECTRONIC STABILIZATION OF NUCLEOPHILIC CARBENES [J].
ARDUENGO, AJ ;
DIAS, HVR ;
HARLOW, RL ;
KLINE, M .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1992, 114 (14) :5530-5534
[6]   High-pressure phase behavior of ionic liquid/CO2 systems [J].
Blanchard, LA ;
Gu, ZY ;
Brennecke, JF .
JOURNAL OF PHYSICAL CHEMISTRY B, 2001, 105 (12) :2437-2444
[7]  
BUBACK M, 1972, BERICH BUNSEN GESELL, V76, P350
[8]   Critical behavior of the restricted primitive model revisited [J].
Caillol, JM ;
Levesque, D ;
Weis, JJ .
JOURNAL OF CHEMICAL PHYSICS, 2002, 116 (24) :10794-10800
[9]  
*CHEM RUBB, 1968, HDB CHEM PHYS
[10]  
*CHEM SOC, 1958, TABL INT DIST CONF M