Dresden 2026 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 15: Emerging Topics in Chemical and Polymer Physics, New Instruments and Methods II

CPP 15.4: Vortrag

Montag, 9. März 2026, 18:00–18:15, ZEU/0255

Exploring Colloidal Kinetics Using DLS — •Mohit Agarwal and Jiaxing Sun — Swabian Instruments GmbH, Stuttgart, Germany

The kinetic behavior of colloidal and soft matter systems arises from particle diffusion, aggregation, and structural rearrangement, which collectively determine how microstructures evolve over time. Accurate characterization of these dynamics is crucial for understanding nonequilibrium phenomena such as gelation, crystallization, and phase separation in complex fluids. Conventional experimental techniques often lack the temporal and angular resolution needed to resolve these fast and heterogeneous processes in their native state, especially when multiple relaxation mechanisms coexist. We present a time-resolved, multi-angle Dynamic Light Scattering (DLS) technique that records individual photon arrival events in real-time across multiple scattering angles. This configuration enables angle-dependent temporal correlation analysis with improved sensitivity to both short-time diffusive motions and long-time relaxation processes that reflect evolving particle interactions. By employing complete photon statistics rather than time-averaged intensity correlations, the method captures transient fluctuations and kinetic transitions in colloidal suspensions. Measurements on well-defined colloidal dispersions reveal subtle temporal variations in particle dynamics and aggregation behavior that remain inaccessible with conventional single- or multi-angle goniometer-based DLS. The technique establishes a robust framework for real-time, multi-scale investigation of kinetic processes in colloidal and soft matter systems.

Keywords: Real-Time Kinetics; Multi-Angle Dynamic Light Scattering; Colloids; Photon Recording; Hydrodynamic Radius