Surface viscosities at high pressure gas-liquid interfaces

Journal Article · Sat Jul 01 04:00:00 EDT 1978 · J. Colloid Interface Sci.; (United States)

DOI:https://doi.org/10.1016/0021-9797(78)90092-9· OSTI ID:6293628

Sagert, N H; Quinn, M J

Coalescence times of bubbles of Ar, CH/sub 4/, C/sub 2/H/sub 4/, C/sub 2/H/sub 6/, H/sub 2/S, CO/sub 2/, and N/sub 2/O in n-hexane are reported. The bubbles were formed simultaneously on two adjacent nozzles in saturated n-hexane and the film lifetimes, or bubble coalescence times, were measured at pressures up to 3.5 MPa by the use of high-speed cimematography. The coalescence times, defined as the time from first touching of the bubbles until they break, were all very short and in no instance exceeded 5 msec. From these results and from previous results for gases in water, the surface viscosities of the solutions were calculated using a modification of the procedure developed by Hartland and Barber. To use this method, an estimate of the film thickness at the time of breaking is required, and this was supplied by Vrij's theory for the inherent breaking times of films. This theory requires a value for the surface viscosity and thus an iterative procedure was used to calculate the surface viscosity appropriate to the observed coalescence time. The surface viscosity obtained is the sum of the dilational and shear viscoities. Reasons are advanced for believing that in these high pressure gas systems the surface dilational viscosity is low. Thus the viscosities measured are largely surface shear viscosities. With water as a solvent, surface viscosities rise from less than 3 ..mu..g/sec to as much as 400 ..mu..g/sec as the saturation vapor pressure is approached, whereas with n-hexane as a solvent, the surface viscosities are all less than 3 ..mu..g/sec. Molecular interactions are proposed to explain this observed behavior. The ability of the gas to form adsorbed multilayers on the solvent surface is believed to promote an increase in surface viscosity. 5 figures, 1 table.

• Research Organization: Atomic Energy of Canada Ltd., Pinawa, Manitoba
• OSTI ID: 6293628
• Journal Information: J. Colloid Interface Sci.; (United States), Journal Name: J. Colloid Interface Sci.; (United States) Vol. 65:3; ISSN JCISA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKANES
ALKENES
ARGON
BUBBLES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
COALESCENCE
COMPARATIVE EVALUATIONS
ELEMENTS
ETHANE
ETHYLENE
FLUIDS
GASES
HEXANE
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INTERFACES
LIQUIDS
MEDIUM PRESSURE
METHANE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS OXIDE
NONMETALS
ORGANIC COMPOUNDS
ORGANIC SOLVENTS
OXIDES
OXYGEN COMPOUNDS
PHOTOGRAPHY
PRESSURE DEPENDENCE
RARE GASES
SOLVENTS
SULFIDES
SULFUR COMPOUNDS
SURFACES
TIME DEPENDENCE
VISCOSITY
WATER