7 - 11 April 2024
Strasbourg, France
Conference 13006 > Paper 13006-72
Paper 13006-72

Particle sizing using q-dependent DLS-OCT

On demand | Presented live 9 April 2024


We demonstrated the application of wavenumber-dependent DLS-OCT to measure both collective and self-diffusion coefficients in concentrated silica suspensions. Depending on the sample polydispersity, we successfully measured either long-time collective or long-time self-diffusion over a broad q-range using our custom-built OCT system. The measured collective diffusion coefficient shows excellent agreement with hard-sphere theory, providing further evidence for the dynamic scaling property. It also serves as an effective tool for accurately determining particle sizes in concentrated suspensions. We found the decoupling approximation to be highly effective in describing the first-order normalized autocovariance functions in both monodisperse and relatively polydisperse samples.


Technische Univ. Delft (Netherlands)
Technische Univ. Delft (Netherlands)