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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 34: Microfluidics I: Applications and Devices

CPP 34.6: Vortrag

Donnerstag, 26. März 2009, 11:00–11:15, ZEU 160

Phase Transition Behaviour of Nanopore Confined Liquids explored by Capillary Rise Experiments — •Simon Gruener and Patrick Huber — Saarland University

We present measurements on the capillary rise (spontaneous imbibition) of liquids into silica monoliths (porous Vycor) permeated by tortuous pores with radii of about 5 nm. The flow properties are studied as a function of the complexity of the building blocks of the liquids (water, n-alkanes and liquid crystals). In this talk I will present measurements that permit detailed insights into the phase transition behaviour of selected liquids during the imbibition process. First and foremost I will focus on the well-known surface freezing effect in tetracosane. Because of the striking impact of this phenomenon on the surface tension of the liquid the capillarity driven imbibition process is perfectly suitable for such examinations. This work has been supported within the DFG priority program 1164, Nano- & Microfluidics (Grant No. Hu 850/2).