

@mastersthesis {6937,
	title = {Solute transport across surfactant-laden interfaces: {Development} of a novel interferometric technique for measuring interfacial resistance},
	year = {1991},
	note = {0570427},
	school = {Massachusetts Institute of Technology},
	type = {phdPh.{D}.},
	address = {Ann Arbor},
	abstract = {A novel technique was developed for the investigation of liquid-liquid interfacial transport in the absence of confounding bulk phase hydrodynamic effects. A unique diffusion cell was developed which permitted the introduction of a step change in concentration without disturbing the interface. The sensitivity of the technique was greatly improved by the use of photolithography techniques to selectively alter the wetting properties of the glass faces of the diffusion cell, eliminating the blind zone produced by the meniscus at the interface. In addition, the application of recently-developed video analysis techniques improved the precision with which the data could be analyzed. Our experimental investigation indicated that the resistance to mass transfer across an AOT-laden interface between water and heptane was dependent on the monolayer pressure, even when the monolayer coverage remained constant. This result could be explained in terms of the effect of monolayer pressure on the energetics of solute adsorption at the interface by using a thermodynamic model for adsorption kinetics. In studies of the transport of solute across an SDS-laden interface surface tension-driven convection occurred in systems containing no added salt. In contrast, when the aqueous phase contained 0.1M NaCl, no convection was observed. It appeared that the convection was related to the compressibility of the interface, although additional studies will be required to confirm that hypothesis. When the rate of solute transport across a C\${\textbackslash}sb\{12\}\$E\${\textbackslash}sb5\$-laden interface was measured, the observed resistance was essentially the same as that across a clean interface. A method of predicting trends in reversed micellar solubilization rates was developed by combining a linear stability analysis of the interface between a bulk aqueous phase and a reversed micellar phase with a scaling analysis of the reversed micellar solubilization process. Preliminary experiments on the rate of solubilization by reversed micellar phases indicated that, because of the complexity of the reversed micellar system, the interferometric technique was not adequate for determining interfacial transport rates. (Copies available exclusively from MIT Libraries, Rm. 14-0551, Cambridge, MA 02139-4307. Ph. 617-253-5668; Fax 617-253-1690.) (Abstract shortened with permission of school.)},
	keywords = {0542:Chemical engineering, Applied sciences, Chemical engineering},
	url = {http://search.proquest.com/docview/304033610?accountid=14270},
	author = {Aunins, Anne Hammons}
}
