Thixotropic Behavior of Oil-in-Water Emulsions Stabilized with Ethoxylated Amines at Low Shear Rates

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dc.contributor.authorGrecco Zanotti M.A.
dc.contributor.authorGoncalves dos Santos R.
dc.date.accessioned2019-08-20T00:12:09Z
dc.date.available2019-08-20T00:12:09Z
dc.date.issued2019
dc.description.abstract© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, WeinheimOil-in-water (O/W) emulsification is a lubricating pipeline method based on the reduction of the energy frictional loss produced during viscous flow. The flow behavior of heavy O/W emulsions formulated with nonionic surfactants is described. The effects of pH and salinity of the aqueous phase on droplet diameter, stability, and apparent viscosity of O/W emulsions were evaluated. The low-shear Couette flow of O/W emulsions displayed intense shear-thinning and thixotropic behavior. Thixotropy was associated to the droplet deformation energy caused by shear rate changes. The droplet deformation and alignment led to the apparent viscosity reduction compared to the fluid at rest. Thixotropic behavior is supposed to balance between the breakdown and recovery of droplet ordered structures. Emulsion formulation parameters were influenced by the aqueous phase pH, enabling to manage the emulsion properties. The droplet mean diameter of < 18 µm resulted in very stable emulsions.
dc.description.firstpage432
dc.description.issuenumber2
dc.description.lastpage443
dc.description.volume42
dc.identifier.citationZANOTTI, MARIA AUGUSTA GRECCO; SANTOS, Ronaldo Goncalves dos. Thixotropic behavior of oil-in-emulsions stabilized with ethoxylated amines at low shear rates. CHEMICAL ENGINEERING & TECHNOLOGY, v. 42, n. 2, p. 432-443, 2019.
dc.identifier.doi10.1002/ceat.201800300
dc.identifier.issn1521-4125
dc.identifier.urihttps://repositorio.fei.edu.br/handle/FEI/1805
dc.relation.ispartofChemical Engineering and Technology
dc.rightsAcesso Restrito
dc.subject.otherlanguageEthoxylated amines
dc.subject.otherlanguageHeavy oil
dc.subject.otherlanguageOil-in-water emulsion
dc.subject.otherlanguageRheology
dc.subject.otherlanguageThixotropy
dc.titleThixotropic Behavior of Oil-in-Water Emulsions Stabilized with Ethoxylated Amines at Low Shear Rates
dc.typeArtigo
fei.scopus.citations7
fei.scopus.eid2-s2.0-85059569081
fei.scopus.subjectApparent viscosity
fei.scopus.subjectDroplet deformation
fei.scopus.subjectDroplet diameters
fei.scopus.subjectEmulsion properties
fei.scopus.subjectOil-in-water emulsions
fei.scopus.subjectOrdered structures
fei.scopus.subjectThixotropic behavior
fei.scopus.subjectThixotropy
fei.scopus.updated2025-02-01
fei.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85059569081&origin=inward
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