6533b872fe1ef96bd12d3ace
RESEARCH PRODUCT
Competition between heterogeneous and homogeneous nucleation near a flat wall
Hans Joachim SchöpeStephan V. RothRoushdey SalhDirk MenkeDieter M. HerlachIna KlassenPatrick WetteAndreas Engelbrechtsubject
ScatteringChemistrySmall-angle X-ray scatteringnucleationNucleationCondensed Matter PhysicsLight scatteringlaw.inventionCondensed Matter::Soft Condensed MatterCrystallographyChemical physicslawMetastabilityGeneral Materials ScienceStatic light scatteringCrystallizationSmall-angle scatteringdescription
We studied the competition between heterogeneous and homogeneous nucleation of an aqueous suspension of charged colloidal spheres close to the container walls. Samples of equilibrium crystalline structure were shear-melted and the metastable melt left to solidify after the cessation of shear. The crystallization kinetics was monitored using time-resolved scattering techniques: at low particle number densities n we applied an improved static light scattering method while at large particle concentrations ultra-small-angle x-ray scattering was applied for the first time. Our results show some unexpected behavior: the heterogeneous nucleation at the container walls is delayed in comparison to the homogeneous bulk nucleation and its rate density appears surprisingly slightly smaller, demonstrating the complexity of the observed crystallization process.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2009-10-27 |