Journal article

Evanescent-wave dynamic light scattering at an oil-water interface: Diffusion of interface-adsorbed colloids

  • Stocco, Antonio Max Planck Institute of Colloids and Interfaces, Golm, Germany
  • Mokhtari, Tahereh Adolphe Merkle Institute, Fribourg, Switzerland
  • Haseloff, Günter Max Planck Institute of Colloids and Interfaces, Golm, Germany
  • Erbe, Andreas Max Planck Institute of Colloids and Interfaces, Golm, Germany - Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany.
  • 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.
Faculté des sciences
Adolphe Merkle Institute
  • English
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