Evanescent-wave dynamic light scattering at an oil-water interface: Diffusion of interface-adsorbed colloids
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Stocco, Antonio
Max Planck Institute of Colloids and Interfaces, Golm, Germany
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Mokhtari, Tahereh
Adolphe Merkle Institute, Fribourg, Switzerland
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Haseloff, Günter
Max Planck Institute of Colloids and Interfaces, Golm, Germany
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Erbe, Andreas
Max Planck Institute of Colloids and Interfaces, Golm, Germany - Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany.
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Sigel, Reinhard
Adolphe Merkle Institute, Fribourg, Switzerland
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Published in:
- Physical Review E. - 2011, vol. 83, no. 1, p. 011601
English
A light-scattering goniometer for evanescent-wave dynamic light scattering (EWDLS) measurements at a liquid-fluid interface is introduced, and used for measurements on two charge-stabilized polystyrene colloid systems adsorbed to alkane-water interfaces. The goniometer allows an independent variation of the penetration depth and the scattering vector components parallel and perpendicular to a liquid-fluid interface. The possible illumination geometries are compared. Ellipsometry at the liquid-fluid interface is implemented as a complementary tool. In EWDLS measurements, the absence of diffusive motion perpendicular to the interface is demonstrated, which confirms the adsorption of the particles. The two-step decay of the autocorrelation function is interpreted in terms of diffusion within a two-dimensional interface lattice of colloidal particles, stabilized by repulsive electrostatic interactions, and a desorption process. A significant slowing down of the in-plane diffusion of the colloids as compared to the bulk diffusion is observed.
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Faculty
- Faculté des sciences et de médecine
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Department
- AMI - Soft Nanoscience
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Language
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Classification
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Physics
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License
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License undefined
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Identifiers
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Persistent URL
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https://folia.unifr.ch/unifr/documents/301807
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