Micellization of sodium bis(2-ethylhexyl)sulfosuccinate in supercritical CO2 with fluorinated co-surfactant and its solubilization of hydrophilic species

被引:23
作者
Liu, JC
Shervani, Z
Raveendran, P
Ikushima, Y
机构
[1] Natl Inst Adv Ind Sci & Technol, Supercrit Fluid Res Ctr, Miyagino Ku, Sendai, Miyagi 9838551, Japan
[2] Japan Sci & Technol Agcy, CREST, Kawaguchi 3320012, Japan
关键词
supercritical CO2; AOT; fluorinated co-surfactant; microemulsions; hydrophilic species;
D O I
10.1016/j.supflu.2004.07.006
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
The solubilities of sodium bis(2-ethylhexyl)suffosuccinate (AOT) in supercritical CO2 (scCO(2)) in the presence of ethanol, I-pentanol and 2,2,3,3,4,4,5,5-octafluoro-1-pentanol (F-pentanol) at 38.0degreesC and different pressures were determined. It was found that AOT (0.01-0.07 M) could be solubilized in scCO(2) with smaller amount of F-pentanol (0.20-0.30 M) compared with ethanol (1.00-1.40 M) and I-pentanol (0.60-1.00 M), because F-pentanol has 'CO2-philic' fluorinated alkane chain. The phase behavior studies for AOT (0.03M)IF-pentanol (0.18-0.35 M)/scCO(2) system ranging in temperature from 38.0 to 52.2degreesC and pressures up to 35.00 MPa indicated that the cloud point pressure of AOT decreased significantly with the addition of F-pentanol, and the lower temperature, the lower cloud point pressure of AOT especially at higher concentrations of F-pentanol. In addition, 0.016 M AOT/0.24 M F-pentanot/scCO(2) system could solubilize a significant amount of water (W-0(total) = 11.5, and W-0(corr) = 6.0) at moderate conditions, which implied the formation of water-in-CO2 reverse microemulsions. Visual observation using a video camera on the solubilization of methyl orange (MO) further proved the existence of polar micro-water domains within the AOT W/C reverse microemulsions. Besides that, bio-macromolecules such as cytochrome c and lysozyme and 8-hydroxy-1,3,6-pyrenetrisulphonic acid trisodium salt (HPTS) characteristic of highly ionic property could be solubilized in the microemulsions, which was obviously reflected by the UV-vis spectra. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:121 / 130
页数:10
相关论文
共 73 条
[1]  
[Anonymous], 1994, SURFACTANT SCI SERIE
[2]   SYNTHESIS AND PERFORMANCE OF HIGH-EFFICIENCY COSURFACTANTS .1. MODEL SYSTEMS [J].
ASGHARIAN, N ;
OTKEN, P ;
SUNWOO, C ;
WADE, WH .
LANGMUIR, 1991, 7 (12) :2904-2910
[3]   ENERGY-TRANSFER AND EXCITON-STATE RELAXATION PROCESSES IN ALLOPHYCOCYANIN [J].
BECK, WF ;
SAUER, K .
JOURNAL OF PHYSICAL CHEMISTRY, 1992, 96 (11) :4658-4666
[4]   PHASE-BEHAVIOR OF INVERSE MICROEMULSIONS FOR THE POLYMERIZATION OF ACRYLAMIDE IN NEAR-CRITICAL AND SUPERCRITICAL CONTINUOUS PHASES [J].
BECKMAN, EJ ;
SMITH, RD .
JOURNAL OF PHYSICAL CHEMISTRY, 1990, 94 (01) :345-350
[5]   Carbon dioxide extraction of biomolecules [J].
Beckman, EJ .
SCIENCE, 1996, 271 (5249) :613-614
[6]   Water in supercritical carbon dioxide microemulsions: Spectroscopic investigation of a new environment for aqueous inorganic chemistry [J].
Clarke, MJ ;
Harrison, KL ;
Johnston, KP ;
Howdle, SM .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1997, 119 (27) :6399-6406
[7]  
Consani K.A., 1990, J SUPERCRIT FLUID, V3, P51, DOI [10.1016/0896-8446(90)90008-A, DOI 10.1016/0896-8446(90)90008-A]
[8]   Polymer synthesis and processing using supercritical carbon dioxide [J].
Cooper, AI .
JOURNAL OF MATERIALS CHEMISTRY, 2000, 10 (02) :207-234
[9]   Extraction of a hydrophilic compound from water into liquid CO2 using dendritic surfactants [J].
Cooper, AI ;
Londono, JD ;
Wignall, G ;
McClain, JB ;
Samulski, ET ;
Lin, JS ;
Dobrynin, A ;
Rubinstein, M ;
Burke, ALC ;
Frechet, JMJ ;
DeSimone, JM .
NATURE, 1997, 389 (6649) :368-371
[10]   Surfactant-modified CO2-water interface:: A molecular view [J].
da Rocha, SRP ;
Johnston, KP ;
Rossky, PJ .
JOURNAL OF PHYSICAL CHEMISTRY B, 2002, 106 (51) :13250-13261