Structure in cohesive powder studied with spin-echo small angle neutron scattering

R. Andersson, W.G. Bouwman, Stefan Luding, I.M. de Schepper

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Abstract

Extracting structure and ordering information from the bulk of granular materials is a challenging task. Here we present Spin-Echo Small Angle Neutron Scattering Measurements in combination with computer simulations on a fine powder of silica, before and after uniaxial compression. The cohesive powder packing is modeled by using molecular dynamics simulations and the structure, in terms of the density–density correlation function, is calculated from the simulation and compared with experiment. In the dense case, both quantitative and qualitative agreement between measurement and simulations is observed, thus creating the desired link between experiment and computer simulation. Further simulations with appropriate attractive potentials and adequate preparation procedures are needed in order to capture the very loose-packed cohesive powders.
Original languageUndefined
Pages (from-to)407-414
Number of pages8
JournalGranular matter
Volume10
Issue number6
DOIs
Publication statusPublished - 2008

Keywords

  • SESANS · Powder · Cohesion · Structure · Density correlation · Molecular dynamics
  • IR-80347
  • METIS-249690

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