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Article: Research from Australian National University reveals new findings on physics.
- Article from:
- Physics Week
- Article date:
- September 8, 2009
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According to recent research published in the journal Physical Review E, "We measured ultra-small-angle neutron scattering (USANS) from polymethylmethacrylate spheres tamped down in air. Two slightly polydisperse pure sphere sizes (1.5 and 7.5 mu m diameters) and five mixtures of these were used."
"All were loose packed (packing fractions of 0.3-0.6) with nongravitational forces (e. g., friction) important, preventing close packing. The USANS data are rich in information on powder packing. A modified Percus-Yevick fluid model was used to parametrize the data-adequately but not well. The modifications required the introduction of small voids, less than the sphere ...
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