Time-Dependent Diffusion Coefficient of Fluids in Porous Media as a Probe of Surface-to-Volume Ratio

  • Latour L
  • Mitra P
  • Kleinberg R
 et al. 
  • 91

    Readers

    Mendeley users who have this article in their library.
  • 297

    Citations

    Citations of this article.

Abstract

The time-dependent diffusion coeff. is independent of the microscopic details of the restricting geometry and depends only on the surface-to-vol. ratio S/V of the pore space. Pulsed field gradient NMR is an ideal tool for measuring the time-dependent diffusion coeff. The min. observation time is detd. by the min. length of gradient pulses and the subsequent recovery of the app. from eddy-current and magnetoacoustic effects. In the current expts., the min. observation time is about 7 ms. The max. time is detd. by the spin-lattice and spin-spin relaxation times of the fluid. For these expts., the max. observation time was chosen to be T1 of the spins. Pulsed field gradient NMR expts. were conducted on fluid-satd. glass sphere packs and on a sample of onion tissue. The diffusion coeff. for the intracellular fluid in an onion was detd. The diffusion coeffs. for distd. water and viscous oil in the pores of a monosized sphere pack were also detd.

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Authors

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free