Diffusion of xenon in liquid alkanes: Temperature dependence measurements with a new method. Stokes–Einstein and hard sphere theories

Autor:	Richard P. Kennan, Jeffrey F. Himm, Gerald L. Pollack, Daniel R. Stump
Rok vydání:	1990
Předmět:	Range (particle radiation) General Physics and Astronomy chemistry.chemical_element Thermodynamics Decane Fick's laws of diffusion chemistry.chemical_compound Molecular dynamics Xenon chemistry Impurity Physical chemistry Physical and Theoretical Chemistry Diffusion (business) Tetradecane
Zdroj:	The Journal of Chemical Physics. 92:625-630
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.458413
Popis:	Measurements are reported of the diffusion constant D(T) for xenon gas, in the form of the radioisotope 133Xe, through liquid n‐octane, n‐decane, and n‐tetradecane, in the range 10–40 °C. The values range from D (10.0 °C, Xe→n‐C14H30)=1.32×10−5 cm2/s to D (40.0 °C, Xe→n‐C8H18)=6.02×10−5 cm2/s. A new experimental method is used in which D is obtained by monitoring the decrease in concentration as gas diffuses into the liquid in an effectively one‐dimensional geometry. As expected, the results do not agree with the Stokes–Einstein law. They do follow the usual correlation Dηp=AT, with p=0.708 and A=9.80×10−8, where η is the liquid viscosity in centipoises and T is in K. Application to these results of the rough‐hard‐sphere theory of diffusion is discussed. A quantitative analysis cannot be made until molecular dynamics results for smooth‐hard‐sphere diffusion are available.
Databáze:	OpenAIRE
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