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An Optical Voltmeter for Studying Cetyltrimethylammonium Interacting with Fused Silica/Aqueous Interfaces at High Ionic Strength
Patrick L. Hayes, Ehow H. Chen, Jennifer L. Achtyl and Franz M. Geiger*
J. Phys. Chem. A, 113, 4269-4280
DOI: 10.1021/jp810891v
Publication Date (Web): March 23, 2009
Copyright © 2009 American Chemical Society
Electrostatics and counterions play important roles in many supramolecular processes, including surfactant adsorption and aggregation at interfaces. Here, we assess their influence on how the common surfactant cetyltrimethylammonium (CTA) interacts with fused silica/aqueous interfaces by determining thermodynamic, kinetic, and electrostatic parameters for CTA adsorption across a range of NaCl concentrations (10−500 mM NaCl) using second harmonic generation (SHG). Using vibrational sum frequency generation (SFG), we demonstrate...

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