ADSORPTION OF SODIUM DODECYL-SULFATE AND COSURFACTANT AT THE PLANAR CYCLOHEXANE-BRINE INTERFACE - VALIDITY OF THE SATURATION ADSORPTION APPROXIMATION AND EFFECTS OF THE COSURFACTANT CHAIN-LENGTH

被引：27

作者：

KEGEL, WK ^{[1
]}

VANAKEN, GA ^{[1
]}

BOUTS, MN ^{[1
]}

LEKKERKERKER, HNW ^{[1
]}

OVERBEEK, JTG ^{[1
]}

DEBRUYN, PL ^{[1
]}

机构：

[1] UNIV UTRECHT,VANT HOFF LAB,PADUALAAN 8,3584 CH UTRECHT,NETHERLANDS

来源：

LANGMUIR | 1993年 / 9卷 / 01期

关键词：

D O I：

10.1021/la00025a048

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The interfacial excess concentrations of sodium dodecyl sulfate (SDS) and two different cosurfactants (pentanol and hexanol) in mixed monolayers at the interface between water (with 0.2 M NaCl) and an oil phase consisting of cyclohexane and cosurfactant are determined from surface tension measurements using the Gibbs adsorption equation. The data are analyzed in two ways: assuming saturation adsorption and fitting the data to the Szyszkowski equation. This analysis reveals that a constant interfacial concentration in the vicinity of the critical micelle concentration is a good approximation even though the cosurfactant interfacial concentration does not reach its saturation value in the experimental cosurfactant concentration range. For both pentanol and hexanol, at low concentrations a strong competition between cosurfactant and SDS is observed, whereas at higher concentrations the composition of the interface remains practically constant. Under these conditions a high packing density in the mixed monolayer is observed.

引用

页码：252 / 256

页数：5

共 24 条

[1] STRUCTURE AND PHASE-EQUILIBRIA OF MICROEMULSIONS [J].

ANDELMAN, D ;

CATES, ME ;

ROUX, D ;

SAFRAN, SA .

JOURNAL OF CHEMICAL PHYSICS, 1987, 87 (12) :7229-7241

[2] ACTIVITY-COEFFICIENTS AND ASSOCIATION OF ALKANOLS IN N-OCTANE [J].

AVEYARD, R ;

BRISCOE, BJ ;

CHAPMAN, J .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS I, 1973, 69 (10) :1772-1778

[3] INTERFACIAL-TENSION MINIMA IN OIL-WATER SURFACTANT SYSTEMS - EFFECTS OF COSURFACTANT IN SYSTEMS CONTAINING SODIUM DODECYL-SULFATE [J].

AVEYARD, R ;

BINKS, BP ;

MEAD, J .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS I, 1987, 83 :2347-2357

[4] SALTING-OUT OF ALKANOLS BY INORGANIC ELECTROLYTES [J].

AVEYARD, R ;

HESELDEN, R .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS I, 1975, 71 (02) :312-321

[5]

DEFAY R, 1966, SURFACE TENSION ADSO, P167

[6]

FREUNDLICH H, 1930, KAPILLARCHEMIE, V1, P77

[7] THERMAL FLUCTUATIONS AND PHASE-EQUILIBRIUM IN MICROEMULSIONS [J].

GOLUBOVIC, L ;

LUBENSKY, TC .

PHYSICAL REVIEW A, 1990, 41 (08) :4343-4366

[8] INTERFACIAL-TENSION OF SODIUM DODECYL-SULFATE SOLUTIONS AT THE HEXANE WATER INTERFACE [J].

JOOS, P ;

VOLLHARDT, D ;

VERMEULEN, M .

LANGMUIR, 1990, 6 (02) :524-525

[9]

KEGEL WK, UNPUB

[10] ON UNDERSTANDING MICROEMULSIONS .2. THERMODYNAMICS OF DROPLET-TYPE MICROEMULSIONS [J].

OVERBEEK, JTG ;

VERHOECKX, GJ ;

DEBRUYN, PL ;

LEKKERKERKER, HNW .

JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1987, 119 (02) :422-441

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