Entropic interactions in mixtures of colloids and non-ionic polymers

Rudhardt, Daniel; Bechinger, Clemens; Leiderer, Paul

Entropic interactions in mixtures of colloids and non-ionic polymers

Dateien

245_progrcollpolymsci_1999.pdf(2.71 MB)

Datum

1999

Autor:innen

Rudhardt, Daniel

Bechinger, Clemens

Leiderer, Paul

Publikationstyp

Zeitschriftenartikel

Erschienen in

Progress in Colloid and Polymer Science ; 112 (1999). - S. 163-167

Zusammenfassung

In binary colloidal mixtures, depletion forces or purely entropic origin play an important role besides interaction like Coulomb or van der Waals interactions. We have measured the potential energy between a single, negatively charged polystyrene sphere (R = 1.5 mm) close to an equally charged wall in the presence of uncharged polymer coils (r = 150 nm) by means of total internal reflection microscopy. Our results show a strong dependence on the polymer concentration n and can be explained by the occurrence of depletion forces. Comparison of our data with a theory which is only correct in first-order n shows good agreement. We also present first observations in a system with an increased particle / polymer size ratio (R = 5 mm, r = 0.15 mm)where higher-order terms in the depletion potential become important.

Fachgebiet (DDC)

530 Physik

Schlagwörter

Depletion forces,Binary mixtures,Polimers,Evanescent waves,Total internal reflection microscopy

Zitieren

ISO 690

RUDHARDT, Daniel, Clemens BECHINGER, Paul LEIDERER, 1999. Entropic interactions in mixtures of colloids and non-ionic polymers. In: Progress in Colloid and Polymer Science. 112, pp. 163-167. Available under: doi: 10.1007/3-540-48953-3_34

BibTex

@article{Rudhardt1999Entro-8922,
  year={1999},
  doi={10.1007/3-540-48953-3_34},
  title={Entropic interactions in mixtures of colloids and non-ionic polymers},
  volume={112},
  journal={Progress in Colloid and Polymer Science},
  pages={163--167},
  author={Rudhardt, Daniel and Bechinger, Clemens and Leiderer, Paul}
}

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