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Proceedings Paper

Scanning force microscopy of synthetic membranes in air and under water: surfaces, cross sections, and fouling
Author(s): Peter Dietz; Karl-Heinz Herrmann; Otto Inacker; Hans-Dieter Lehmann; Paul K. Hansma
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Paper 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.

Paper Details

Date Published: 1 May 1992
PDF: 12 pages
Proc. SPIE 1639, Scanning Probe Microscopies, (1 May 1992); doi: 10.1117/12.58186
Show Author Affiliations
Peter Dietz, Univ. of California/Santa Barbara (United States)
Karl-Heinz Herrmann, Univ. Tuebingen (Germany)
Otto Inacker, Naturwissenschaftliches und Medizinisches Institut Reutlinge (Germany)
Hans-Dieter Lehmann, Naturwissenschaftliches und Medizinisches Institut Reutlinge (Germany)
Paul K. Hansma, Univ. of California/Santa Barbara (United States)

Published in SPIE Proceedings Vol. 1639:
Scanning Probe Microscopies
Srinivas Manne, Editor(s)

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