Spin-echo small-angle neutron scattering (SESANS) measurements of needle-like crystallites of gelator compounds

From dibenzoyl cystine, a low molecular weight gelator, we have prepared needle shaped crystals at relatively high concentrations. For the first time SESANS measurements are performed on objects with this geometry. From the measurements the average diameter can be seen directly. From a more careful analysis the width distribution is determined....

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

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...

Stress, strain, and bulk microstructure in a cohesive powder

Spin-echo small-angle neutron scattering is able to characterize powders in terms of their density density correlation function. Here we present a microstructural study on a fine cohesive powder undergoing uniaxial compression. As a function of compression, we measure the autocorrelation function of the density distribution. From these...