Fractal geometry of surface areas of sand grains probed by pulsed field gradient NMR.
Pulsed field gradient NMR self-diffusion studies of water were used to determine surface-to-volume ratios and specific surface areas of the grains forming a glacial sand deposit. Both quantities exhibit a noninteger power-law dependence as a function of the diameters of the grains. The associated fractal dimensions of the surface area ( D(s)) and of the pore volume ( D(v)) are found to be D(s)-D(v) = -0.70+/-0.05 and D(s) = 2.20+/-0.05. The results demonstrate that NMR studies with native pore fluids are suitable to investigate the fractal nature of natural, unconsolidated porous materials.
Stallmach
Frank
F
Fakultät für Physik und Geowissenschaften, Universität Leipzig, Linnestrasse 5, 04105 Leipzig, Germany. stallmac@physik.uni-leipzig.de
Vogt
Corina
C
Kärger
Jörg
J
Helbig
Katrin
K
Jacobs
Franz
F