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Flow measurements below 50 mum: NMR microscopy experiments in lithographic model pore spaces
Authors:Kossel Elke  Kimmich Rainer
Institution:1. Clinical Assistant Professor, Department of Restorative Dentistry, University of Colorado, School of Dentistry;2. Assistant Professor, Department of Periodontics, University of Nebraska, School of Dentistry;1. College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA;2. School of Electrical and Computer Engineering, The University of Oklahoma, Norman, OK 73019, USA;3. Institute for Magnetic Resonance, Safety, Education, and Research, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA;1. The MRI Institute for Biomedical Research, 440 East Ferry Street, Detroit, MI 48202, USA;2. Department of Radiology, Wayne State University, 3990 John R Road, Detroit, MI 48202, USA;3. University of Western Australia, School of Physics, Crawley, WA 6009, Australia;4. Department of Radiological Sciences, St. Jude Children''s Research Hospital, Memphis, TN 38105, USA;5. Departments of Neurosurgery and Radiation Science, Loma Linda University, 11175 Campus St., SP Ste. 1113, Loma Linda, CA 92350, USA
Abstract:Quasi two-dimensional random site percolation model objects have been prepared using a synchrotron radiation lithography technique with a spatial resolution better than 50 microm and an aspect ratio of up to 17. Flow of water through the pore space was studied with the aid of an NMR velocity mapping method and compared with a computational fluid dynamics simulation. In order to be able to measure and map widely distributed flow velocities with microscopic resolution (typically 40 x 40 microm), an experimental protocol that permits one to cover an effectively very wide velocity field of view (0.6-10 mm/s) had to be developed.
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