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Two-staged sorption isotherm of a nanoporous energy absorption system

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3 Author(s)
Surani, Falgun B. ; Department of Civil Engineering, University of Akron, Akron, Ohio 44325-3905 ; Kong, Xinguo ; Qiao, Yu

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To selectively absorb impact energy, the profiles of sorption isotherms of protection systems must be adjusted in a broad spectrum. In this article, a N-Lauroylsarcosine sodium salt (sarcosyl) of intermediate molecular size is used to control the pressure induced infiltration of a nanoporous silica. The experimental result shows that the infiltration plateau of this system is two-staged; that is, not only the activation pressure but also the infiltration volume can be modified. It is noticed that the sarcosyl molecule demands a “free volume” to enter a nanopore. The free volume size decreases nearly linearly as the sarcosyl concentration increases.

Published in:

Applied Physics Letters  (Volume:87 ,  Issue: 25 )