6533b85efe1ef96bd12c084e
RESEARCH PRODUCT
Particle characterization using multiple scattering decorrelation methods: hard-sphere model system
Andreas HeymannThomas PalbergChristian Sinnsubject
Materials scienceScatteringbusiness.industryMultiangle light scatteringMolecular physicsSmall-angle neutron scatteringLight scatteringCondensed Matter::Soft Condensed Mattersymbols.namesakeOpticsDynamic light scatteringsymbolsScattering theoryRayleigh scatteringBiological small-angle scatteringbusinessdescription
Applying static light scattering experiments, we characterize colloidal particles that are used as model hard-sphere systems in experiments investigating their crystallization kinetics. The particles comprise of a compact core of poly(methyl methacrylate) and short polymer hairs grafted onto the surface. We use a contrast variation procedure to determine the refractive index variation within the particles and observe that one component of the binary mixture used as a solvent penetrates the particles and masks completely the small polymer hairs. Making use of the determined refractive index variation, we obtain the average particle radius and its polydispersity from measurements of the particle form factor close to its minimae. The scattered intensity has been corrected carefully for multiple scattering contributions applying dynamic light scattering measurements with multiple scattering decorrelation. We obtain a mean particle radius ofRmacr;=435+/-4 nm and a polydispersity of sigma=2.5%, a resolution that has not been achieved with light scattering experiments before.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2000-07-01 | Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics |