Dresden 2020 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 50: Poster Session III

CPP 50.39: Poster

Tuesday, March 17, 2020, 14:00–16:00, P1C

Rheology of Oligo- and Polymers in Oxidic Nanoporous Materials: Gravimetric and Optofluidic Experiments — •Guido Dittrich and Patrick Huber — Institute of Materials Physics and Technology, Hamburg University of Technology (TUHH), Eißendorfer Str. 42, D-21073 Hamburg-Harburg, Germany

The rheology in nanometer sized pores is a research field with many open questions especially for complex molecules. Oxidic nanoporous materials offer a stiff scaffold with high specific surface area and confining geometries. Therefore, surface tension and capillarity are dominant and affect along with interface interactions and pure spatial restrictions the flow properties. From a scientific point of view oligo- and polymers add to the complexity by a rheology that depends on the chain length and chemistry. We investigate the transport dynamics of styrene-based oligo- and polymer melts in anodic aluminum oxide (AAO) and compare them with those in controlled porous glasses (CPG). These materials exhibit a cylindrical, hexagonally arranged and a sponge-like pore morphology, respectively. Due to the different morphologies AAO is investigated with an opto-interferometric [1] and CPG with a gravimetric technique [2].

[1] Cencha, Luisa G., et al.: "Nondestructive high-throughput screening of nanopore geometry in porous membranes by imbibition." Applied Physics Letters 115 (2019) 113701.

[2] Gruener, Simon, and Patrick Huber: "Imbibition in mesoporous silica: rheological concepts and experiments on water and a liquid crystal." Journal of Physics: Condensed Matter 23 (2011) 184109.