Premium
Relation of Supersaturation Ratio in Mixed Anionic Surfactant Solutions to Kinetics of Precipitation with Calcium
Author(s) -
Soontravanich Sukhwan,
Scamehorn John F.
Publication year - 2010
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-009-1150-6
Subject(s) - supersaturation , chemistry , precipitation , pulmonary surfactant , calorimetry , kinetics , sodium , sodium dodecyl sulfate , solubility , calcium , sulfonate , inorganic chemistry , chromatography , thermodynamics , organic chemistry , biochemistry , physics , quantum mechanics , meteorology
One synergism of using surfactant mixtures is the reduction in the equilibrium extent of and rate of precipitation. The overall time required for calcium‐induced precipitation of mixed sodium dodecyl sulfate (SDS) and sodium octylbenzene sulfonate (SOBS) over a particular range of ratios has been found to increase dramatically when compared to either SDS or SOBS alone. In this study, light transmission and isoperibol calorimetry were used to measure the delay in the precipitation reaction, while scanning electron and optical micrographs of crystals formed give insight into the precipitation mechanism. The smaller the difference in the supersaturation ratio of the two precipitating surfactants, the longer the induction time is. The delay in the extent of precipitation is due to the interruption of crystal formation from dissimilar precipitating surfactants.