Dresden 2017 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 62: Fluids and Interfaces III

CPP 62.7: Vortrag

Donnerstag, 23. März 2017, 16:45–17:00, ZEU 255

Structural disjoining pressures from DFT and the spreading of terraced drops — •Uwe Thiele1, Adam P. Hughes2, Hanyu Yin2, David N. Sibley2, and Andrew J. Archer21Institut für Theoretische Physik, Westfälische Wilhelms-Universität, Wilhelm-Klemm Str. 9, 48149 Münster — 2Department of Mathematical Science, Loughborough University, Loughborough, LE11 3TU, UK

For a liquid film on a solid substrate, we determine the binding potential g(h) that encodes the wetting behaviour. The method developed in [1] for the example of a simple discrete lattice-gas model, is used with continuum density functional theory (DFT) to calculate the binding potential for a Lennard-Jones fluid and other simple liquids. The DFT we use incorporates the influence of the layered packing of molecules at the surface. At low temperatures this can result in an oscillatory decay of g(h), i.e., a structural disjoining pressure Π = − ∂ g / ∂ h [2]. The obtained binding potentials are incorporated in a mesoscopic hydrodynamic model to study the spreading of (terraced) drops on both, an adsorption (or precursor) layer and completely dry substrates [3]. To achieve this, the thin film model is modified in such a way that for thicker films the standard mesoscopic hydrodynamic theory is realised, but for very thin layers a diffusion equation is recovered. [1] A.P. Hughes, U. Thiele, and A.J. Archer, J. Chem. Phys. 142, 074702 (2015). [2] A.P. Hughes, U. Thiele and A.J. Archer, preprint at http://arxiv.org/abs/1611.06957. [3] H. Yin, D.N. Sibley, U. Thiele and A.J. Archer, preprint at http://arxiv.org/abs/1611.00390.

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