Effect of nonionic surfactant on ion adsorption and hydration forces
- Australian National Univ., Canberra (Australia)
Measurements have been carried out of the force between mica surfaces immersed in aqueous micellar solutions of the nonionic surfactant penta(oxyethylene) n-dodecyl ether with sodium sulfate as a background electrolyte. At surfactant concentrations below about 5 {times} 10{sup {minus}3} M ({approx} 100 {times} cmc), adsorption to the mica surface is weak and can only be indirectly inferred from a reduction in the surface potential in dilute electrolyte solution. Further evidence for adsorption is provided by a decrease in the measured adhesion between the surfaces and an enhanced viscous drag at small (< 5.0 nm) separations. In more concentrated salt solution, there is a decrease in the magnitude of the hydration force due to surfactant adsorption. Unlike the case with cationic surfactants, the adsorbed surfactants do not give rise to any steric force; they are easily pushed out as the surfaces are brought together.
- OSTI ID:
- 6307115
- Journal Information:
- Langmuir; (USA), Journal Name: Langmuir; (USA) Vol. 6:6; ISSN LANGD; ISSN 0743-7463
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020400* -- Petroleum-- Processing
ADSORPTION
ALKALI METAL COMPOUNDS
CALCULATION METHODS
DATA
ETHERS
EXPERIMENTAL DATA
HYDRATION
INFORMATION
MICA
MICELLAR SYSTEMS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXYGEN COMPOUNDS
SODIUM COMPOUNDS
SODIUM SULFATES
SOLVATION
SORPTION
SULFATES
SULFUR COMPOUNDS
SURFACTANTS