Influence of Bivalent Ion on Oil/Water Interfacial Properties

Abstract:

The interfacial tension (IFT) and contact angles of different oil/solutions were compared to unveil the influence of Mg²⁺ on oil/NaOH interfacial properties. The results demonstrate that adding Mg²⁺ to NaOH solution cannot change the oil/NaOH interfacial tension when enough OH^- is provided. While for NaOH-surfactant solution, adding Mg²⁺ changes the IFT dramatically. Adding NaOH to oil/water produces a minimal contact angle at NaOH of 0.02wt%. Adding surfactant or MgCl₂ alone increases the contact angles. Adding them together produces a synergism to bringing down contact angles gradually with the increase of NaOH concentration. The change of salinity and the reaction among them may be responsible for the influence and synergism.

• Periodical: Advanced Materials Research (Volumes 1033-1034)
• Pages: 486-490
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1033-1034.486
• Online since: October 2014
• Authors: Hai Yan Zhang*
• Keywords: Bivalent Ions, Contact Angle, Interfacial Tension, Oil/Alkaline

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