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Fouling of membrane filters is the key performance limiting factor in membrane filtration. Thus fouling and anti-fouling have received much attention in recent years, covering topics from fouling mechanisms and characteristics to anti-fouling surface modifications. This paper presents a method to achieve controlled grafting of an anti-fouling poly(ethylene glycol) (PEG) brush polymer layer onto a sintered alumina membrane filter surface without reduction of the filter permeability. The obtained PEG layers were characterized using a broad range of surface techniques including Fourier transformed infrared spectroscopy, ellipsometry, atomic force microscopy, and contact angle measurements. Dead-end filtration experiments with PEG-brush modified filters showed improved fouling reversibility for the filtration of a BSA solution and significantly slowed down the fouling rate during filtration of a lysozyme solution. The cross-flow filtration of model lake-water demonstrated improved foulant removal for the PEG modified filters during backflush cleaning and Journal of Self-Assembly and Molecular Electronics, Vol. 1, 19–38. doi: 10.13052/jsame2245-4551.2016.002 c © 2016 River Publishers. All rights reserved. 20 D. A. Nielsen et al. thereby increased the overall throughput during a filtration cycle as compared to the bare membrane filters.

Improved Anti-Fouling Performance of Sintered Alumina Membrane Filters Modified with Grafted-on PEG-Brush Polymer