Characterization of polyethersulfone-polyimide hollow fiber membranes by atomic force microscopy and contact angle goniometery

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Khulbe, K.C. and Feng, C. and Matsuura, T. and Kapantaidakis, G.C. and Wessling, M. and Koops, G.H. (2003) Characterization of polyethersulfone-polyimide hollow fiber membranes by atomic force microscopy and contact angle goniometery. Journal of Membrane Science, 226 (1-2). pp. 63-73. ISSN 0376-7388

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Abstract:Asymmetric blend polyethersulfone-polyimide (PES-PI) hollow fiber membranes prepared at different air gap and used for gas separation are characterized by atomic force microscopy (inside and out side surfaces) and by measuring the contact angle of out side surface. The outer surface was entirely different than the inner surface, as expected. On the inner surface nodule aggregates were aligned in rows, may be towards the direction of the bore fluid flow. On the outer surface, alignment of nodular aggregates in one direction was not observed. The average mean roughness parameter of the inner surface increased with the increase in the air gap used for the preparation of hollow fiber. On the other hand, it was opposite for the outer surface. From the gas separation experiments it was observed that gas permeation rate increased with the increase in air-gap. An attempt was made to find relationships between the surface morphology observed by AFM and permeability and selectivity of the studied hollow fiber membranes.

From the contact angle measurement it was observed that the contact angle is directly related to the outside surface roughness. A plausible mechanism has been discussed.
Item Type:Article
Copyright:© 2003 Elsevier B.V.
Faculty:
Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/41097
Official URL:http://dx.doi.org/10.1016/j.memsci.2003.08.011
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Metis ID: 217297