Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2008-12-04
Physics
Condensed Matter
Soft Condensed Matter
34 pages, 11 figures, To be submitted to JCP
Scientific paper
We investigated the viscoelastic properties of colloid-polymer mixtures at intermediate colloid volume fraction and varying polymer concentrations, thereby tuning the attractive interactions. Within the examined range of polymer concentrations, the samples ranged from fluids to gels. Already in the liquid phase the viscoelastic properties significantly changed when approaching the gelation boundary, indicating the formation of clusters and transient networks. This is supported by an increasing correlation length of the density fluctuations, observed by static light scattering and microscopy. At the same time, the correlation function determined by dynamic light scattering completely decays, indicating the absence of dynamical arrest. Upon increasing the polymer concentration beyond the gelation boundary, the rheological properties changed qualitatively again, now they are consistent with the formation of colloidal gels. Our experimental results, namely the location of the gelation boundary as well as the elastic (storage) and viscous (loss) moduli, are compared to different theoretical models. These include consideration of the escape time as well as predictions for the viscoelastic moduli based on scaling relations and Mode Coupling Theories (MCT).
Brader Joseph M.
Cardinaux Frédéric
Egelhaaf Stefan U.
Fuchs Madeleine
Koumakis N.
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