Quantifying the Influence of Salts on Nonionic Surfactant Micelle Formation and Chemical Potentials
Date : March 23rd, 2021, Tuesday
Time : 17:30
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Meeting ID: 729 064 5404
Salt-induced changes in the critical micelle concentration of 1,2-hexanediol are investigated by combining Raman multivariate curve resolution spectroscopy with a generalized theoretical analysis strategy. Anions on opposite ends of the Hofmeister series (SO42- and SCN–) are found to shift the micelle concentration in the same direction. The combined spectroscopic and theoretical analysis traces these observations to the greater anion affinity for (or weaker expulsion from) the hydration shell of the micelle than the free surfactant monomer, while the opposite is true for other anions and cations. This probe-free experimental and theoretical analysis strategy is more broadly applicable to other micelle formation, aggregation and binding processes.
Dor Ben-Amotz was born in 1954 in Jerusalem, Israel, grew up in Berkeley, California, obtained a BA from Bennington College, a PhD from the UC Berkeley with Charles B. Harris, and was a postdoctoral fellow at the Exxon Corporate Research Lab with Dudley R. Herschbach of Harvard University. He joined the chemistry faculty at Purdue University in 1989 where he and his research group (and numerous collaborators) performed experimental and theoretical studies of liquid state chemistry and hyperspectral chemical imaging. Over the past decade much of his research has focused on water-mediated interactions, investigated using Raman multivariate curve resolution spectroscopy, computer simulations, and statistical thermodynamics. He has written a physical chemistry textbook entitled Understanding Physical Chemistry and is currently teaching a graduate course entitled Scientific Writing and Critical Thinking.