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dc.contributor.authorWang, Bo
dc.contributor.authorLai, Zhiping
dc.date.accessioned2015-08-03T09:57:08Z
dc.date.available2015-08-03T09:57:08Z
dc.date.issued2012-07
dc.identifier.issn03767388
dc.identifier.doi10.1016/j.memsci.2012.03.020
dc.identifier.urihttp://hdl.handle.net/10754/562226
dc.description.abstractThe 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.
dc.description.sponsorshipThis 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.
dc.publisherElsevier BV
dc.subjectCeramic hollow fibre membranes
dc.subjectFinger-like voids
dc.subjectPhase inversion
dc.subjectViscous fingering
dc.titleFinger-like voids induced by viscous fingering during phase inversion of alumina/PES/NMP suspensions
dc.typeArticle
dc.contributor.departmentAdvanced Membranes and Porous Materials Research Center
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division
dc.contributor.departmentChemical and Biological Engineering Program
dc.identifier.journalJournal of Membrane Science
dc.contributor.institutionSchool of Bioengineering and Chemical Engineering, Anhui Polytechnic University, Wuhu 241000, China
kaust.personWang, Bo
kaust.personLai, Zhiping


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