Knudsen Diffusion in Silicon Nanochannels

Details Knudsen Diffusion in Silicon Nanochannels Knudsen Diffusion in Silicon Nanochannels

2008-02-13

arxiv.org/abs/0802.1852v1

Physical Review Letters 100, 064502 (2008)

Physics

Fluid Dynamics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.100.064502

Measurements on helium and argon gas flow through an array of parallel, linear channels of 12 nm diameter and 200 micrometer 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_He ~ sqrt(T), is confirmed over a T range from 40 K to 300 K for He and for the ratio of D_He/D_Ar ~ sqrt(m_Ar/m_He). Deviations of the channels from a cylindrical form, resolved with transmission 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.

Affiliated with

Also associated with

No associations

Rating

Knudsen Diffusion in Silicon Nanochannels does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Knudsen Diffusion in Silicon Nanochannels, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Knudsen Diffusion in Silicon Nanochannels will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-676842