Salt-induced changes of colloidal interactions in critical mixtures

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2011
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Nellen, Ursula
Dietrich, Julian
Helden, Laurent
Chodankar, Shirish
Nygard, Kim
Van der Veen, J. Friso
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Soft Matter. 2011, 7(11), pp. 5360-5364. ISSN 1744-683X. eISSN 1744-6848. Available under: doi: 10.1039/C1SM05103B
Zusammenfassung

We report on salt-dependent interaction potentials of a single charged particle suspended in a binary liquid mixture above a charged wall. For symmetric boundary conditions (BC) we observe attractive particle-wall interaction forces which are similar to critical Casimir forces previously observed in salt-free mixtures. However, in case of antisymmetric BC we find a temperature-dependent crossover from attractive to repulsive forces which is in strong contrast to salt-free conditions. Additionally performed small-angle x-ray scattering experiments demonstrate that the bulk critical fluctuations are not affected by the addition of salt. This suggests that the observed crossover can not be attributed alone to critical Casimir forces. Instead our experiments point towards a possible coupling between the ionic distributions and the concentration profiles in the binary mixture which then affects the interaction potentials in such systems.

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ISO 690NELLEN, Ursula, Julian DIETRICH, Laurent HELDEN, Shirish CHODANKAR, Kim NYGARD, J. Friso VAN DER VEEN, Clemens BECHINGER, 2011. Salt-induced changes of colloidal interactions in critical mixtures. In: Soft Matter. 2011, 7(11), pp. 5360-5364. ISSN 1744-683X. eISSN 1744-6848. Available under: doi: 10.1039/C1SM05103B
BibTex
@article{Nellen2011-04-28T13:26:09ZSalti-39382,
  year={2011},
  doi={10.1039/C1SM05103B},
  title={Salt-induced changes of colloidal interactions in critical mixtures},
  number={11},
  volume={7},
  issn={1744-683X},
  journal={Soft Matter},
  pages={5360--5364},
  author={Nellen, Ursula and Dietrich, Julian and Helden, Laurent and Chodankar, Shirish and Nygard, Kim and Van der Veen, J. Friso and Bechinger, Clemens}
}
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