| Using breath figure patterns on structured substrates for the preparation of hierarchically structured microsieves. | |
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MedLine Citation:
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PMID: 18163659 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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Microsieves are advanced filtration membranes characterized by a uniform pore size, a high pore density, and a thickness smaller than the pore diameter. The uniform pore size provides a high selectivity; the small thickness gives rise to a high flux and allows efficient removal of any filter cake by backflushing. However, microsieves are sensitive to mechanical stress. Thus, they need either an external macroporous support or a hierarchical structure that provides an integrated supportive structure. We prepare microsieves with a hierarchical pore structure by creating breath figure patterns within layers of solutions of polymers in a volatile solvent that are spread out on top of structured supports. For the formation of breath figure patterns, the volatile solvent is evaporated in a moist atmosphere. This cools the surface to such an extent that dew droplets form on the thin film, partially penetrate into the layer, and create a concave imprint in the final solid polymer layer. This procedure is usually done on flat surfaces; in our case the spreading of the polymer solution is done on a support decorated with protrusions. In this procedure, the dew droplets touch the protrusions of the structured support before the polymer solution vitrifies. At the same time, the trenches of the structured substrate are filled with polymer much deeper than the penetration depth of the dew droplets. After the separation of the vitrified layer from the substrate, we obtain thin polymer membranes with a hierarchical structure consisting of an ultrathin active separation layer with submicrometer pores and a supporting layer with larger pores. |
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Authors:
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Claudia Greiser; Susann Ebert; Werner A Goedel |
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Publication Detail:
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Type: Journal Article Date: 2007-12-29 |
Journal Detail:
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Title: Langmuir : the ACS journal of surfaces and colloids Volume: 24 ISSN: 0743-7463 ISO Abbreviation: Langmuir Publication Date: 2008 Feb |
Date Detail:
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Created Date: 2008-01-29 Completed Date: 2008-04-02 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9882736 Medline TA: Langmuir Country: United States |
Other Details:
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Languages: eng Pagination: 617-20 Citation Subset: - |
Affiliation:
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Physical Chemistry, Chemnitz University of Technology, Strasse der Nationen 62, 09111 Chemnitz, Germany. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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