New surface viscometer of high sensitivity. Part 3. Stearic acid at the oil/water interface
Work with the knife-in-wall surface shear viscometer is continued using the oil/water interface. The viscometer is useful for studies at liquid/liquid interfaces and also is a valuable tool in investigating the interfacial structure of adsorbed films. When used in conjunction with interfacial tension measurements, it can greatly elucidate the physical condition of an interface. Stearic acid adsorbed from cyclohexane to the cyclohexane/aqueous NaCl interface responds rheologically in dramatic fashion when changes are made in the pH of the aqueous phase of the temperature of the system. Starting at an interfacial viscosity of 5 X 10/sup -4/ surface poise at pH 5.5, etao/w increases to greater than 10/sup -1/ surface poise at the point of maximum surface concentration (pH 9.0). Increasing the pH beyond 9.0 causes the stearic acid to dissolve into the aqueous phase and drastically reduces the interfacial viscosity. The interfacial tension reflects the changes in the interface. At pH 9.0, the interface experiences a phase change as the temperature is raised from T = 21.5 C to T = 21.9 C. 31 references.
- OSTI ID:
- 5392982
- Journal Information:
- J. Colloid Interface Sci.; (United States), Vol. 75:2
- Country of Publication:
- United States
- Language:
- English
Similar Records
Organic Enrichment at Aqueous Interfaces: Cooperative Adsorption of Glucuronic Acid to DPPC Monolayers Studied with Vibrational Sum Frequency Generation
Effects of stearic acid on the injection molding of alumina
Related Subjects
DISPLACEMENT FLUIDS
SURFACE TENSION
VISCOSITY
VISCOSIMETERS
PERFORMANCE
CYCLOHEXANE
INTERFACES
MICROEMULSIONS
OCTADECANOIC ACID
PH VALUE
SODIUM CHLORIDES
TEMPERATURE EFFECTS
ALKALI METAL COMPOUNDS
ALKANES
CARBOXYLIC ACIDS
CHLORIDES
CHLORINE COMPOUNDS
COLLOIDS
CYCLOALKANES
DISPERSIONS
EMULSIONS
FLUIDS
HALIDES
HALOGEN COMPOUNDS
HYDROCARBONS
MEASURING INSTRUMENTS
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
SODIUM COMPOUNDS
SURFACE PROPERTIES
020300* - Petroleum- Drilling & Production