Surfactant adsorption kinetics by total internal reflection Raman spectroscopy. 2. CTAB and Triton X-100 mixtures on silica.
作者： David A. Woods , Jordan Petkov , Colin D. Bain
DOI: 10.1021/JP201340J
关键词:
摘要: Total internal reflection (TIR) Raman spectroscopy has been used to study the kinetics of adsorption, desorption, and displacement mixed surfactant systems at silica–water interface. The limited penetration depth evanescent wave provides surface sensitivity while chemical scattering permits determination time-dependent composition adsorbed film. Principal component analysis is deconvolute spectra with a time resolution 2 s precision 5% monolayer. Both equilibrium kinetic measurements are presented for cetyltrimethylammonium bromide (CTAB)/Triton X-100 system over range concentrations compositions. For total concentration mM, adsorption isotherm shows strong synergistic behavior addition small amounts CTAB (∼2% surfactant) doubling amount Triton X-100. This synergism marked influence on kinetics: example, when replaces...
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