Description of the fluctuating colloid-polymer interface

Details Description of the fluctuating colloid-polymer interface Description of the fluctuating colloid-polymer interface

2008-07-22

arxiv.org/abs/0807.3456v1

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 3 figures, 1 table. Accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.101.086101

To describe the full spectrum of surface fluctuations of the interface between phase-separated colloid-polymer mixtures from low scattering vector q (classical capillary wave theory) to high q (bulk-like fluctuations), one must take account of the interface's bending rigidity. We find that the bending rigidity is negative and that on approach to the critical point it vanishes proportionally to the interfacial tension. Both features are in agreement with Monte Carlo simulations.

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