Scanning force microscopy of synthetic membranes in air and under water: surfaces, cross sections, and fouling

Peter Dietz; Karl-Heinz Herrmann; Otto Inacker; Hans-Dieter Lehmann; Paul K. Hansma

doi:10.1117/12.58186

1 May 1992 Scanning force microscopy of synthetic membranes in air and under water: surfaces, cross sections, and fouling

Peter Dietz, Karl-Heinz Herrmann, Otto Inacker, Hans-Dieter Lehmann, Paul K. Hansma

Author Affiliations +

Proceedings Volume 1639, Scanning Probe Microscopies; (1992) https://doi.org/10.1117/12.58186
Event: OE/LASE '92, 1992, Los Angeles, CA, United States

Abstract

Atomic force microscopy was used to image surfaces and cross sections of different types of microporous membranes used for ultrafiltration and dialysis. Characteristic surface structures with funnel-shaped pores could be detected with resolution better than 10 nm. Ultrafiltration membranes with molecular weight cutoff values between 5,000 and 100,000 show wide variations in homogeneity, roughness, size and density of pores, but with a basic network-like fine structure. Cross sections allow one to compare inner structure and surface. An evident change of the surface of one membrane was observed after using the membrane over a long time for clearfiltration of juice. Cellulosic dialysis membranes with different biocompatibility were compared in air and under water. Structural differences could be observed between modified and unmodified type. Under water the structures are considerably changed due to swelling processes.

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Peter Dietz, Karl-Heinz Herrmann, Otto Inacker, Hans-Dieter Lehmann, and Paul K. Hansma "Scanning force microscopy of synthetic membranes in air and under water: surfaces, cross sections, and fouling", Proc. SPIE 1639, Scanning Probe Microscopies, (1 May 1992); https://doi.org/10.1117/12.58186

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