Dresden 2020 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 46: Complex Fluids and Soft Matter (joint session DY/CPP)

CPP 46.7: Talk

Tuesday, March 17, 2020, 11:15–11:30, ZEU 160

Static properties of modulated hard-spheres liquid. — •Michele Caraglio, Charlotte F. Petersen, and Thomas Franosch — Institut für Theoretische Physik, Leopold-Franzens-Universität Innsbruck, Technikerstraße 21A, A-6020 Innsbruck, Austria

The structure of a liquid can be manipulated with externally applied fields. This can be achieved experimentally with interfering lasers and has been implemented with colloidal particles [1, 2]. This possibility also paves the way to a better understanding of confined liquids [3], which are prevalent in nature and necessary in many industrial applications.

We investigate static properties in a hard-sphere liquid with modulated density profile obtained by applying an external periodic field. In this system we will control three dimensionless parameters: the packing fraction, the amplitude of the potential relative to temperature and its wavelength relative to particle diameter. For this purpose, the Ornstein-Zernike integral equation using Percus-Yevick closure relation is solved numerically. The theory requires the density profile as input, which can be obtained from density functional theory. Similar to a liquid confined in a slit, a non-monotonic evolution of the static structure factor peak and the pressure is observed upon variation of the potential wavelength.

[1] C. Bechinger, M. Brunner and P, Leiderer, PRL 86, 2001. [2] F. Evers, et al., PRE 88, 2013. [3] S. Saw and C. Dasgupta, J. Chem. Phys. 145, 2016.