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    Finger-like voids induced by viscous fingering during phase inversion of alumina/PES/NMP suspensions

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    Type
    Article
    Authors
    Wang, Bo
    Lai, Zhiping cc
    KAUST Department
    Advanced Membranes and Porous Materials Research Center
    Biological and Environmental Sciences and Engineering (BESE) Division
    Chemical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2012-07
    Permanent link to this record
    http://hdl.handle.net/10754/562226
    
    Metadata
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    Abstract
    The formation mechanism of phase-inversion ceramic hollow fibre membranes has not been well understood. In this paper, we report on the formation of finger-like macrovoids during non-solvent-induced phase inversion of alumina/PES/NMP suspensions. A membrane structure without such finger-like macrovoids was observed when the suspension was slowly immersed into pure ethanol or a mixture of 70. wt% NMP and 30. wt% water, whereas finger-like macrovoids occurred when the suspension was slid into the non-solvents at higher speeds. We found that the formation process of finger-like macrovoids could be fully or partially reversed when nascent membranes were taken out from water shortly after immersion, depending on the duration of the immersion. Splitting of the fingers during the formation of the macrovoids was also observed during the phase inversion of two alumina/PES/NMP suspensions. These experimental observations were not predicted by current theories of finger-like macrovoid formation in polymer membranes, but appear to mimic the well-known viscous fingering phenomenon. We therefore propose that in the phase inversion of ceramic suspensions, the viscous fingering phenomenon is an important mechanism in the formation of finger-like voids. © 2012 Elsevier B.V.
    Citation
    Wang, B., & Lai, Z. (2012). Finger-like voids induced by viscous fingering during phase inversion of alumina/PES/NMP suspensions. Journal of Membrane Science, 405-406, 275–283. doi:10.1016/j.memsci.2012.03.020
    Sponsors
    This work was supported by baselines funds to Z.P. Lai from King Abdullah University of Science and Technology. B. Wang acknowledges support from the Ministry of Education of China (Contract No. 210093). We thank Dr. S.H. Choi for stimulating discussions and Dr. P. Wang for providing access to the microscope.
    Publisher
    Elsevier BV
    Journal
    Journal of Membrane Science
    DOI
    10.1016/j.memsci.2012.03.020
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.memsci.2012.03.020
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Advanced Membranes and Porous Materials Research Center; Physical Science and Engineering (PSE) Division; Chemical Engineering Program

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