Berlin 2015 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 5: Colloids and Complex Liquids I (joint session CPP/ BP/ DY)

DY 5.12: Talk

Monday, March 16, 2015, 12:30–12:45, C 130

Isobutyric acid and water mixture confined in a silica nanopore — •Michael Harrach and Barbara Drossel — Institut für Festkörperphysik, TU Darmstadt, Darmstadt, Germany

We analyze the phase behaviour of water and isobutyric acid mixtures of differing weight percentages, in a silica nanopore of roughly 4  nm diameter and a corresponding smooth-walled confinement based on the average potential as given by the pore. While experimental studies have been interpreted as showing evidence for a phase seperation of water and isobutyric acid with the water situated at the pore wall we observe the converse, with the water rich part of the mixture preferring the pore center. The comparison of the smooth and rough pore allows us to further determine the importance of potential hydrogen bond sites and their influence on the static and dynamic characteristics of the mixture.