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Theory of the time-lag diffusion method for the case of an outgassing solid

Published online by Cambridge University Press:  31 January 2011

James K. Baird  and
Jenn-Shing Chen
James K. Baird
Affiliation:
Department of Chemistry, University of Alabama in Huntsville, Huntsville, Alabama 35802
Jenn-Shing Chen
Affiliation:
Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan 30050, Republic of China
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Abstract

In the ordinary application of the time-lag method to the measurement of the diffusion coefficient of a gas passing through a plane sheet of an inert solid, the gas is pressurized on one side of the sheet and evacuated on the other. After decay of transients, the cumulative amount, Q(t), of gas diffused through the sheet in time, t, assumes the “time-lag” form, Q(t) = A(t – L). Measurements of the slope, A, and the intercept, L, can be used to determine the diffusion coefficient and the solubility of the gas in the solid. We have rederived this law for the case of a solid that is actively evolving this same gas at an arbitrary rate and have used it to predict the rate of outgassing of the solid upon standing. Practical applications of the theory include radioactive decay of minerals, rejection of plasticizers by plastics, and the decomposition of solid rocket propellants.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 6 , June 1993 , pp. 1455 - 1461
Copyright
Copyright © Materials Research Society 1993

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References

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