Pure Thermal Diffusion. II. Experimental Thermal Diffusion Factors and Mutual Diffusion Coefficients for CCl4–C6H12

Abstract

An improved phenomenological theory for pure thermal diffusion [J. Chem. Phys. 53, 2321, (1970)] has been used in conjunction with a laser wavefront shearing interferometer and a sample cell free of unwanted convection to measure thermal diffusion factors α₁ and mutual diffusion coefficients D for the CCl₄–C₆H₁₂ system between 20 and 35°C. The results, in mole fraction x₁ of CCl₄ and Celsius temperature T, are: ${\alpha }_1{\text{=− 1.83}}_1{\text{+0.18}}_1{x}_1{\text{+0.010}}_4{\text{(T−25)−0.000}}_8{x}_1\text{(T−25)}$ , with a calculated standard error in α₁ of 0.01₉, and ${10}^5\mathrm{D\hspace{0.17em}(}{\mathrm{cm}}^2\hspace{0.17em}{\sec }^{\text{−1}}{\text{)= 1.48}}_1{\text{−0.18}}_7{x}_1{\text{+0.024}}_4{\text{(T‐25)+0.002}}_4{x}_1\text{(T−25)}$ , with a calculated standard error in 10⁵D of 0.03₅ cm² sec⁻¹.