Drainage mechanism of microbubble dispersion and factors influencing its stability

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dc.contributor.author Feng, Wanhua en
dc.contributor.author Singhal, Naresh en
dc.contributor.author Swift, Simon en
dc.date.accessioned 2015-04-16T23:52:58Z en
dc.date.available 2009-05-21 en
dc.date.issued 2009 en
dc.identifier.citation Journal of Colloid and Interface Science, 2009, 337 (2), pp. 548 - 554 (7) en
dc.identifier.issn 0021-9797 en
dc.identifier.uri http://hdl.handle.net/2292/25244 en
dc.description.abstract Microbubble dispersion stability is a desirable characteristic in applications such as separation processes and in-situ bioremediation. This study investigates the effects of surfactant concentration, pH and ionic strength on the stability of dispersions of rhamnolipid, a common anionic biosurfactant. Microbubble dispersions of rhamnolipid and the non-ionic synthetic surfactant tergitol 15-S-12 were prepared by intensive stirring at 8000 rpm with solutions of 500–4000 mg l−1 surfactant concentration at pH 6–8. The ionic strength tests were performed with 1000–3000 mg l−1 sodium chloride. Dispersion stability increases for higher surfactant concentrations, but decreases with rising pH and increasing salt concentration. However, increasing the pH in the co-presence of salt enhances dispersion stability. A modified model showing improved fits to liquid drainage from the dispersions is presented and it is shown that liquid drainage occurs in three distinct phases, instead of two phases as previously assumed in the literature en
dc.language eng en
dc.publisher Elsevier en
dc.relation.ispartofseries Journal of Colloid and Interface Science en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from http://www.sherpa.ac.uk/romeo/issn/0021-9797/ en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.title Drainage mechanism of microbubble dispersion and factors influencing its stability en
dc.type Journal Article en
dc.identifier.doi 10.1016/j.jcis.2009.05.054 en
pubs.issue 2 en
pubs.begin-page 548 en
pubs.volume 337 en
dc.rights.holder Copyright: Elsevier en
dc.identifier.pmid 19541325 en
pubs.author-url http://www.sciencedirect.com/science/article/pii/S0021979709007206 en
pubs.end-page 554 en
pubs.publication-status Published en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 94838 en
pubs.org-id Engineering en
pubs.org-id Civil and Environmental Eng en
pubs.org-id Medical and Health Sciences en
pubs.org-id Medical Sciences en
pubs.org-id Molecular Medicine en
pubs.record-created-at-source-date 2010-09-01 en
pubs.dimensions-id 19541325 en

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