Binary Mutual Diffusion Coefficients of Aqueous Solutions of β-Cyclodextrin at Temperatures from 298.15 to 312.15 K

Abstract

Binary mutual diffusion coefficients (interdiffusion coeffcients) have been measured for aqueous solutions of β-cyclodextrin (β-CD) at concentrations from (0.002 to 0.008) mol·dm-3. The effect of temperature, from (298.15 to 312.15) K, was also analyzed. The concentration dependence of D is discussed on the basis of Hartley's equation. The activation energy for the diffusion process, 18719 J·mol-1, was calculated from data of D at different temperatures. This activation energy is in good agreement with that estimated using Stokes−Einstein equation (18644 J·mol-1). Activity coefficients for aqueous β-CD solutions were also estimated from Hartley equation and experimental D.