471949 Dynamic Surface Tension Measurements with Maximum Bubble Pressure Tensiometry

Sunday, November 13, 2016: 4:45 PM
Union Square 23 & 24 (Hilton San Francisco Union Square)
Norman Moreno, Theodore Walker, Camilla U. Ortiz, Adam Burshan and Vivek Sharma, Chemical Engineering, University of Illinois at Chicago, Chicago, IL

Dynamic surface tension refers to the time dependent variation in surface tension, and is intimately linked with the rate of mass transfer of a surfactant from liquid sub-phase to the interface. The diffusion- or adsorption-limited kinetics of mass transfer to the liquid/gas interface is said to impact the so-called foamability and the Gibbs-Marangoni elasticity of surfaces. Dynamic surface tension measurements carried out with conventional methods like pendant drop analysis, Wilhelmy plate, etc are limited in their temporal resolution (> 50 ms). In this study, we describe the design and application of maximum bubble pressure tensiometry for the measurement of dynamic surface tension effects at extremely short (1-50 ms) timescales. Using experiments and theory, we discuss the challenges and experimental constraints related with the maximum bubble pressure tensiometry measurement.

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See more of this Session: Interfacial Transport Phenomena
See more of this Group/Topical: Engineering Sciences and Fundamentals