Abstract
AbstractThe Taylor dispersion technique is modified to measure the concentration‐dependent mutual diffusion coefficient D of cetylpyridinium chloride (CPC) + water at 25°C near the critical micelle concentration. The solution flowing into the dispersion tube is changed from a solution of CPC concentration C− to a solution of concentration C− + ΔC, forming an initially‐sharp moving boundary at the tube inlet. The broadened concentration profile across the eluted boundary is followed by using a flow‐through differential refractometer at the tube outlet. A numerical procedure similar to the Boltzmann‐Matano procedure for the analysis of free diffusion profiles yields the values of D at the concentrations between C− and C− + ΔC, from a single dispersion run. D for aqueous CPC is found to drop very sharply as the concentration is raised through the critical micelle concentration.
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