High Internal Phase Emulsions under Shear. Co-Surfactancy and Shear Stability

dc.contributor.authorYaron, Peter
dc.contributor.authorScott, Andrew
dc.contributor.authorReynolds, Philip
dc.contributor.authorJitendrakumar, Mata
dc.contributor.authorWhite, John
dc.date.accessioned2015-12-10T22:17:16Z
dc.date.issued2011
dc.date.updated2016-02-24T12:14:16Z
dc.description.abstractLarge changes in the rheology of high-internal phase aqueous-in-oil emulsions (HIPEs) using an oil-soluble polyisobutylene-based primary surfactant (PIBSA) are provoked by very small quantities of water-soluble polyamide-based cosurfactants (PAM with C12, C14, and C16 tails). The structural origin of this was studied using small-angle neutron scattering (SANS) from sheared emulsions, with simultaneous in situ rheology measurements. The PAM drastically lowers the droplet-oil interfacial tension by displacing PIBSA, causing large droplet deformation under shear and much lowered emulsion yield stress. With PAM, the surfactant monolayer at the droplet surface becomes more responsive to droplet shape change and redistributes in response to shear which the PIBSA-only system does not. Although it is oil-insoluble, PAM also reaches the nanoscale PIBSA micelles in the oil phase, changing micelle size and content in ways predictable from the hydrophilicity of the different PAMs. PAM does not, however, strongly affect the viscosities at high shear rates; shear thinning and thickening are unaffected. Droplet size, droplet-droplet flattening, and linkage determine the viscosities observed, more so than droplet-oil interfacial tension. We infer from this that the droplet motion under shear does not involve much transient droplet deformation as the droplets move by each other.
dc.identifier.issn1520-6106
dc.identifier.urihttp://hdl.handle.net/1885/51332
dc.publisherAmerican Chemical Society
dc.sourceJournal of Physical Chemistry B
dc.subjectKeywords: Co-surfactants; Droplet deformation; Droplet motion; Droplet shape; Droplet sizes; Droplet surfaces; High internal phase emulsions; High shear rate; In-situ; Interfacial tensions; Micelle size; Nano scale; Oil phase; Shear stability; Shear thinning; Small
dc.titleHigh Internal Phase Emulsions under Shear. Co-Surfactancy and Shear Stability
dc.typeJournal article
local.bibliographicCitation.issue19
local.bibliographicCitation.lastpage5784
local.bibliographicCitation.startpage5775
local.contributor.affiliationYaron, Peter, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationScott, Andrew, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationReynolds, Philip, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationJitendrakumar, Mata, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationWhite, John, College of Physical and Mathematical Sciences, ANU
local.contributor.authoremailu8506305@anu.edu.au
local.contributor.authoruidYaron, Peter, u4567400
local.contributor.authoruidScott, Andrew, u2526224
local.contributor.authoruidReynolds, Philip, u9400730
local.contributor.authoruidJitendrakumar, Mata, u4366391
local.contributor.authoruidWhite, John, u8506305
local.description.embargo2037-12-31
local.description.notesImported from ARIES
local.identifier.absfor030603 - Colloid and Surface Chemistry
local.identifier.absseo920102 - Cancer and Related Disorders
local.identifier.ariespublicationu9911292xPUB221
local.identifier.citationvolume115
local.identifier.doi10.1021/jp2005919
local.identifier.scopusID2-s2.0-79956081222
local.identifier.thomsonID000290427100009
local.identifier.uidSubmittedByu9911292
local.type.statusPublished Version

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