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

Handle URI:
http://hdl.handle.net/10754/562226
Title:
Finger-like voids induced by viscous fingering during phase inversion of alumina/PES/NMP suspensions
Authors:
Wang, Bo; Lai, Zhiping ( 0000-0001-9555-6009 )
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.
KAUST Department:
Advanced Membranes and Porous Materials Research Center; Biological and Environmental Sciences and Engineering (BESE) Division; Physical Sciences and Engineering (PSE) Division; Chemical and Biological Engineering Program
Publisher:
Elsevier
Journal:
Journal of Membrane Science
Issue Date:
Jul-2012
DOI:
10.1016/j.memsci.2012.03.020
Type:
Article
ISSN:
03767388
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.
Appears in Collections:
Articles; Advanced Membranes and Porous Materials Research Center; Physical Sciences and Engineering (PSE) Division; Chemical and Biological Engineering Program; Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorWang, Boen
dc.contributor.authorLai, Zhipingen
dc.date.accessioned2015-08-03T09:57:08Zen
dc.date.available2015-08-03T09:57:08Zen
dc.date.issued2012-07en
dc.identifier.issn03767388en
dc.identifier.doi10.1016/j.memsci.2012.03.020en
dc.identifier.urihttp://hdl.handle.net/10754/562226en
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.en
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.en
dc.publisherElsevieren
dc.subjectCeramic hollow fibre membranesen
dc.subjectFinger-like voidsen
dc.subjectPhase inversionen
dc.subjectViscous fingeringen
dc.titleFinger-like voids induced by viscous fingering during phase inversion of alumina/PES/NMP suspensionsen
dc.typeArticleen
dc.contributor.departmentAdvanced Membranes and Porous Materials Research Centeren
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentChemical and Biological Engineering Programen
dc.identifier.journalJournal of Membrane Scienceen
dc.contributor.institutionSchool of Bioengineering and Chemical Engineering, Anhui Polytechnic University, Wuhu 241000, Chinaen
kaust.authorWang, Boen
kaust.authorLai, Zhipingen
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