Colloids and Surfaces A 538 (2018) 720–728 Contents lists available at ScienceDirect Colloids and Surfaces A journal homepage: www.elsevier.com/locate/colsurfa Temperature and composition eﬀects on the morphology of o/w dispersions based on poly(oxyethylene 20) sorbitan monolaurate and sorbitan monolaurate Letícia Streck, Ana L.P.F. Caroni, José L.C. Fonseca Instituto de Química, Universidade Federal do Rio Grande do Norte, Campus Universitário, Lagoa Nova, RN 59072-970, Brazil GR APHICAL A BSTRACT ARTICLE I NFO ABSTRACT Keywords: Phase behavior of colloidal systems containing oleic acid, poly(oxyethylene 20) sorbitan monolaurate, sorbitan Oleic acid monolaurate, and water were studied as a function of composition and temperature. The pseudo-ternary diagram Non-ionic surfactants of the resultant dispersions showed the presence of regions related to the occurrence of microemulsions, gel Phase behavior microemulsions, high viscosity emulsions, and low viscosity emulsions. SAXS indicated that compositions with SAXS surfactant contents above 50% presented lamellar structures. The same technique was used to detect that this DLS structure was destroyed at 45 °C for systems with oleic acid contents of 10%, while dispersions with 1.5, 2, and 5% of oleic acid did not have their lamellar structure disrupted at this temperature. It indicated that, at the highest oleic acid content used in this
Geoderma – Elsevier
Published: Feb 15, 2019
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