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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 26: Micro and Nanofluidics I

CPP 26.3: Vortrag

Mittwoch, 24. März 2010, 14:30–14:45, H39

Invasion Kinetics of Hydrocarbons into Networks of Silica Mesopores — •Simon Gruener¹, Helen E. Hermes², Stefan U. Egelhaaf², and Patrick Huber¹ — ¹Physics of Mesoscopic Systems, Saarland University, Saarbruecken — ²Soft Matter Physics, Heinrich-Heine University, Duesseldorf

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 invasion dynamics have been recorded by standard gravimetric measurements, but also by means of neutron radiography experiments. The latter method provides detailed information on the spatial distribution of the liquid within the sample. For one thing this allows for the determination of the liquid’s rise height h(t) complementary to the sample’s mass increase m(t). Furthermore, insights into the invasion kinetics of the liquid front into the mesoporous network can be gained. Based on these results the occurrence of light scattering at the advancing front can be conclusively traced back to the non-negligible pore size distribution of the applied Vycor glass. This work has been supported within the DFG priority program 1164, Nano- & Microfluidics (Grant No. Hu 850/2).