Abstract
Time-resolved fluorescence quenching studies of sodium lauryl ether sulfate micelles
Highlights
The worldwide consumption of detergents is dominated by anionic surfactants 1 and, among these, alkylbenzenesulfonates (LABS) predominate, followed by alkyl ether sulfates (LESS, Scheme 1) and linear alkyl sufates (LAS, Scheme 1) such as sodium dodecylsulfate (SDS)
The purified sodium lauryl ether sulfate (SLES) was characterized by 1H nuclear magnetic resonance (NMR), which confirmed the presence of an average of 2 oxyethylene units
critical micelle concentration (CMC) were determined from measurements of the surface tension as a function of log [SLES], performed on a du Noüy tensiometer equipped with a platinum ring
Summary
The worldwide consumption of detergents is dominated by anionic surfactants 1 and, among these, alkylbenzenesulfonates (LABS) predominate, followed by alkyl ether sulfates (LESS, Scheme 1) and linear alkyl sufates (LAS, Scheme 1) such as sodium dodecylsulfate (SDS). They are more expensive to produce than either LABS or LAS, LESS have several unique properties that enhance their utility in higher added-value personal care products and dishwashing formulations. The present work examines the [detergent]- and [salt]-induced growth of an important commercial LESS surfactant sodium dodecyl ether sulfate (SLES), which has an average of two ethylene oxide subunits in the ether bridge. The purified SLES was characterized by 1H nuclear magnetic resonance (NMR), which confirmed the presence of an average of 2 oxyethylene units
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