Interfacial Tension

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dc.contributor.authorLeonardi, Gislaine Ricci [UNIFESP]
dc.contributor.authorMonteiro e Silva, Silas A. [UNIFESP]
dc.contributor.authorGuimaraes, Carina M. [UNIFESP]
dc.contributor.authorPerrechil, Fabiana A. [UNIFESP]
dc.contributor.authorLandgraf, Richardt G. [UNIFESP]
dc.contributor.authorFriberg, Stig E.
dc.date.accessioned2019-07-22T15:46:51Z
dc.date.available2019-07-22T15:46:51Z
dc.date.issued2016
dc.description.abstractThe destabilization process was investigated for a Janus emulsion of silicone and Bixa Orellana oils stabilized by polyoxyethylene sorbitan monooleate (Tw 80) and carboxymethyl cellulose. The emulsion stabilized with Tw 80 showed significant and fast creaming, a process that was prevented by the addition of the polymer. During the extensive coalescence of the emulsions stabilized by Tw 80, the Janus topology was retained for months of storage until, finally, separation of the oils occurred. This result strongly indicates an unexpected stabilizing action of the i nterfacial free energy. This conclusion was supported by a calculation for a realistic model system of the interfacial energy difference between two cases of coalescence. In the first case, the two coalescing Janus drops united into a larger Janus drop, while in the second case two drops formed, each with only one oil. The first case gave a spontaneous reaction (reduced interfacial energy), while the second one meant an increase of energy, i.e. it cannot happen without adding energy. The authors are aware that this stabilization is a new phenomenon in emulsion science with potential ramifications in future emulsion technology. However, it is essential to realize that the stabilization is of temporary occurrence in the destabilization process, and the free energy to give a final emulsion state with separated oils is overwhelmingly dominant. In short, Janus emulsions will, in the end, separate into layers of the liquids, like all emulsions.en
dc.description.affiliationUniv Campinas UNICAMP, Fac Pharmaceut Sci, Rua Sergio Buarque de Holanda 250,CB-2,Sala E06, BR-13083859 Campinas, SP, Brazil
dc.description.affiliationUniv Fed Sao Paulo, UNIFESP, Dept Med, Sao Paulo, Brazil
dc.description.affiliationUniv Fed Sao Paulo, Inst Environm Chem & Pharmaceut Sci, UNIFESP, Diadema, Brazil
dc.description.affiliationNTNU, Ugelstad Lab, Trondheim, Norway
dc.description.affiliationUnifespUniv Fed Sao Paulo, UNIFESP, Dept Med, Sao Paulo, Brazil
dc.description.affiliationUnifespUniv Fed Sao Paulo, Inst Environm Chem & Pharmaceut Sci, UNIFESP, Diadema, Brazil
dc.description.sourceWeb of Science
dc.description.sponsorshipCNPq
dc.description.sponsorshipFAPESP
dc.description.sponsorshipUgelstad Laboratory
dc.format.extent1009-1014
dc.identifierhttp://dx.doi.org/10.1007/s11743-016-1847-2
dc.identifier.citationJournal Of Surfactants And Detergents. Heidelberg, v. 19, n. 5, p. 1009-1014, 2016.
dc.identifier.doi10.1007/s11743-016-1847-2
dc.identifier.issn1097-3958
dc.identifier.urihttp://repositorio.unifesp.br/handle/11600/51117
dc.identifier.wosWOS:000381998900011
dc.language.isoeng
dc.publisherSpringer Heidelberg
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.subjectJanus emulsionen
dc.subjectSilicone oilen
dc.subjectBixa Orellana oilen
dc.subjectVegetable oilen
dc.subjectStabilityen
dc.subjectJanus topologyen
dc.subjectCreamingen
dc.subjectCoalescenceen
dc.titleInterfacial Tensionen
dc.titlea Stabilizing Factor for Janus Emulsions of Silicone Bixa Orellana Oilsen
dc.typeinfo:eu-repo/semantics/article
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