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Dynamic light scattering for characterization of latices
Author(s) -
Killmann Erwin,
Sapuntzjis Perikles,
Maier Herbert
Publication year - 1992
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19920610105
Subject(s) - electrokinetic phenomena , adsorption , dynamic light scattering , molar mass , colloid , materials science , diffusion , flocculation , chemical physics , macromolecule , polymer , light scattering , aqueous solution , chemical engineering , scattering , chemistry , thermodynamics , nanoparticle , nanotechnology , composite material , optics , physics , biochemistry , engineering
With photon correlation spectrometry the diffusion coefficients of colloid particles in highly diluted aqueous suspensions can be measured and average diameters and polydispersities of the samples can be determined. Electrokinetic and electroviscous effects caused by polarization of the electrostatic double layer influence the diffusion of the particles. The adsorption of macromolecules at the interfaces of the particles results in an increase of the hydrodynamic diameter and a decrease of the diffusion and sedimentation coefficients. The hydrodynamic thicknesses of the polymer layers can be evaluated. The thickness values and their dependences on adsorbed amount and molar mass can only be interpreted by the existence of long tails of the adsorbed macromolecules dangling from the interface into the solution. The resulting conformation model is supported by the new theory of Scheutjens‐Fleer. Special importance have those tails for the interaction of particles and their stability and flocculation in disperse systems.