Relationship between surface viscosity and surface composition of adsorbed surfactant films

Journal Article · Mon Feb 01 04:00:00 EST 1982 · Ind. Eng. Chem. Fundam.; (United States)

DOI:https://doi.org/10.1021/i100005a005· OSTI ID:6248931

Djabbarah, N F; Wasan, D T

The single-bubble foaming technique was used to determine the surface excess concentrations of aqueous solutions of sodium lauryl sulfate (SLS) and lauryl alcohol (LOH). The excess concentrations of sodium lauryl sulfate-lauryl alcohol showed that lauryl alcohol is preferentially adsorbed at the surface, but only partially displaces sodium lauryl sulfate. This causes a higher total surface concentration and, consequently, a closer packing of surfactant molecules. The total surface excess concentration increases with an increase in the bulk concentration of the 2 surfactants until the critical micelle concentration (CMC) is reached. At concentrations exceeding the CMC, the surface excess concentration of LOH remains virtually constant, while that of SLS declines. This is due to the formation of SLS micelles. The surface excess concentration data have been used to estimate the extent of molecular packing at the gas/liquid interface and to assess interactions among surfactant molecules in order to explain trends in surface viscosity of a mixed surfactant system adsorbed from an aqueous solution. 30 references.

• OSTI ID: 6248931
• Journal Information: Ind. Eng. Chem. Fundam.; (United States), Journal Name: Ind. Eng. Chem. Fundam.; (United States) Vol. 21:1; ISSN IECFA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ADSORPTION
ALCOHOLS
ALKALI METAL COMPOUNDS
DISPERSIONS
DISPLACEMENT FLUIDS
FLUIDS
HYDROXY COMPOUNDS
INTERFACES
MICELLAR SYSTEMS
MIXTURES
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
QUANTITY RATIO
SODIUM COMPOUNDS
SODIUM SULFATES
SORPTION
SULFATES
SULFUR COMPOUNDS
SURFACE PROPERTIES
SURFACTANTS
VISCOSITY