Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 8: Hydrogels and Microgels
CPP 8.9: Vortrag
Montag, 7. März 2016, 17:30–17:45, H40
Microgel ultrafiltration — •Rafael Roa1, Jonas Riest2, and Gerhard Naegele2 — 1Helmholtz-Zentrum Berlin, Institute for Soft Matter and Functional Materials, Berlin, Germany — 2Forschungszentrum Juelich, Institute of Complex Systems (ICS-3), Juelich, Germany
Membrane ultrafiltration (UF) is a pressure driven process allowing for the separation and enrichment of protein solutions and dispersions of nanosized microgel particles. The permeate flux and the near-membrane concentration-polarization (CP) layer in this process is determined by advective-diffusive dispersion transport and the interplay of applied and osmotic transmembrane pressure contributions. The UF performance is thus strongly dependent on the membrane properties, the hydrodynamic structure of the Brownian particles, their direct and hydrodynamic interactions, and the boundary conditions. We present a macroscopic description of cross-flow UF of microgels. We analyze the CP layer properties and the permeate flux at different operating conditions. Our results show that the proper specification of the concentration-dependent transport coefficients is important for reliable filtration process predictions. We also show that the solvent permeability of microgels is an essential ingredient to the UF modeling. The particle permeability lowers the particle concentration at the membrane surface, thus increasing the permeate flux.