Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 12: Morphology Prediction at Interfaces
O 12.10: Talk
Monday, March 7, 2016, 17:15–17:30, S051
Temperature dependence of ethanol water nanophase separation in soft graphene mica slitpore — •Abdul Rauf1, Jonas Gienger2, Nikolai Severin1, Igor M. Sokolov1, and Jürgen P. Rabe1,3 — 1Humboldt Universität zu Berlin — 2Physikalisch-Technische Bundesanstalt, Berlin — 3IRIS Adlershof, Berlin
Real space imaging with Scanning Force Microscopy (SFM) revealed nanophase separation in a fluid monolayer of ethanol and water confined in a soft graphene-mica slitpore. The interactions which determine the irregular equilibrium patterns had been attributed qualitatively to the interplay of short-range attractive, and long-range electrostatic repulsive interactions. However, determining strength and range of these interactions quantitatively presented a challenge due to the complex screened dipole-dipole interactions, the bending energy of the graphene sheet, and intermolecular interactions. The interaction potential, however, has been reconstructed applying an Inverse Monte Carlo approach on SFM micrographs of the system. The reconstructed potential was then used to predict the behavior of the system outside the experimentally accessible range of parameters such as temperature and vapor pressure, including critical demixing temperature. [1]
To validate this approach experimentally, its predictions regarding the response of the system to temperature changes were tested by imaging the nanophase-separated patterns at various temperatures using an SFM equipped with heating/cooling elements. [1] J. Gienger, N. Severin, J. P. Rabe, I. M. Sokolov 2015, arXiv:1505.03011 [cond-mat.stat-mech]