Phase behaviour of a mixed ionic/nonionic surfactant system used to prepare stable oil-in-water paraffin emulsions

被引：39

作者：

Vilasau, J. ^{[1
]}

Solans, C. ^{[1
]}

Gomez, M. J. ^{[2
]}

Dabrio, J. ^{[2
]}

Mujika-Garai, R. ^{[2
]}

Esquena, J. ^{[1
]}

机构：

[1] CSIC, IQAC, CIBER BBN, Barcelona, Spain

[2] RYLESA Repsol YPF Lubricantes & Especialidades SA, Madrid, Spain

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2011年 / 384卷 / 1-3期

关键词：

Paraffin emulsions; Mixed surfactant system; Liquid crystal; Phase behaviour; SAXS; LIQUID-CRYSTALLINE PHASES; WAX EMULSIONS; FLOCCULATION; ATTAINMENT; SCATTERING;

D O I：

10.1016/j.colsurfa.2011.05.029

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 phase behaviour of a mixed surfactant system was studied in order to determine the role of surfactants in the stability of paraffin emulsions. The study was carried out by means of phase diagrams. The different phases were characterized by Small and Wide Angle X-ray Scattering (SAXS/WAXS), Polarized Optical Microscopy (POM) and Differential Scanning Calorimetry (DSC). The results showed that the nonionic and ionic surfactants, used in industry for paraffin emulsions, possess high Krafft points and both form lamellar interdigitated gel structures. Phase behaviour of the water/mixed surfactant pseudoternary system indicated that, lamellar liquid crystalline aggregates are formed at very diluted surfactant concentrations (approximate to 98 wt% water), even at low nonionic/ionic surfactant weight ratio (10/90). Therefore, lamellar liquid crystalline aggregates coexist with excess water, at the surfactant compositions used to obtain stable paraffin emulsions (2-4 wt% of mixed surfactant). Theses aggregates could contribute to the high kinetic stability of the paraffin emulsions. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：473 / 481

页数：9

共 27 条

[1] GEL AND LIQUID-CRYSTAL PHASE STRUCTURES OF THE TRIOXYETHYLENE GLYCOL MONOHEXADECYL ETHER WATER-SYSTEM [J].