Abstract
Liquid-liquid interfacial tension is very important in colloid and surface chemistry as it detects the amount of energy required to create a new interface. This makes its measurement very crucial. There are different techniques for measuring it, with the common ones being the du Noüy ring and spinning drop methods. The aim of this work is to compare the low interfacial tension values obtained from the du Noüy ring method with those obtained using the spinning drop method in vegetable oil-silicone oil systems. Low interfacial tension values of various vegetable oil-silicone oil systems were measured with the du Noüy ring and spinning drop methods. The interfacial tension values range from 2.1 to 2.8 mN m‒1 for the du Noüy ring method and 1.0 to 2.7 mN m‒1 for the spinning drop method. These values agree closely)05.0(=p. This shows that both methods can be used for measuring interfacial tension with high accuracy in vegetable oil-silicone oil systems.
Highlights
Intermolecular forces are responsible for the surface tension of liquids (Sophocleous, 2010)
These forces are of two types, namely the cohesive forces which represent the attractive forces between molecules of the same substance and the adhesive forces which represent the attractive forces between molecules of different substances (Sophocleous, 2010)
Surface tension is the force acting per unit length on either sides of an imaginary line drawn on the free surface of a liquid, with the direction of action being perpendicular to the imaginary line and tangential to the free surface of the liquid (Tyowua, 2017)
Summary
Intermolecular forces are responsible for the surface tension of liquids (Sophocleous, 2010). The liquid molecules at the surface have less number of neighbours on all sides, compared with those in the bulk, and as a result cohere more strongly with the neighbouring molecules than those in the bulk (Hunter, 1989). This gives rise to a surface film which acts like an elastic membrane. Surface tension is responsible for many physical phenomena It is responsible for the spherical nature of gas bubbles and liquid drops (de Gennes et al, 2004). Interfacial tension is very important in colloid science as it determines the amount of energy required to create a new interface as well as the size of the new interface created (Cosgrove, 2005)
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