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- W2048441808 abstract "Measurements on helium and argon gas flow through an array of parallel, linear channels of 12 nm diameter and $200text{ }text{ }ensuremath{mu}mathrm{m}$ length in a single crystalline silicon membrane reveal a Knudsen diffusion type transport from ${10}^{2}$ to ${10}^{7}$ in Knudsen number Kn. The classic scaling prediction for the transport diffusion coefficient on temperature and mass of diffusing species, ${D}_{mathrm{He}}ensuremath{propto}sqrt{T}$, is confirmed over a $T$ range from 40 K to 300 K for He and for the ratio of ${D}_{mathrm{He}}/{D}_{mathrm{Ar}}ensuremath{propto}sqrt{{m}_{mathrm{Ar}}/{m}_{mathrm{He}}}$. Deviations of the channels from a cylindrical form, resolved with electron microscopy down to subnanometer scales, quantitatively account for a reduced diffusivity as compared to Knudsen diffusion in ideal tubular channels. The membrane permeation experiments are described over 10 orders of magnitude in Kn, encompassing the transition flow regime, by the unified flow model of Beskok and Karniadakis." @default.
- W2048441808 created "2016-06-24" @default.
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- W2048441808 date "2008-02-12" @default.
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- W2048441808 title "Knudsen Diffusion in Silicon Nanochannels" @default.
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- W2048441808 doi "https://doi.org/10.1103/physrevlett.100.064502" @default.
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