Measurement of interfacial tension between oil and an aqueous solution via a floating drop method

2017 ◽  
Vol 529 ◽  
pp. 985-989 ◽  
Author(s):  
Masashi Nakamoto ◽  
Toshihiro Tanaka ◽  
Takaiku Yamamoto
Keyword(s):  
Aqueous Solution ◽  
Interfacial Tension ◽  
Drop Method

scholarly journals Spontaneous emulsification of pure xylene in an aqueous solution through mere adsorption of a detergent in the interface

1949 ◽  
Vol 198 (1055) ◽  
pp. 447-454 ◽  
Keyword(s):  
Aqueous Solution ◽  
Interfacial Tension ◽  
Pure Liquid ◽  
Detergent Solution ◽  
Liquid Hydrocarbons ◽  
Spontaneous Emulsification ◽  
Pure Solvent ◽  
Dodecylamine Hydrochloride ◽  
Spherical Droplets ◽  
Aqueous Detergent

Spontaneous emulsification of a pure liquid can occur. This is demonstrated when liquid hydrocarbons are quietly placed upon the surface of the solution of a suitable detergent. Here special attention has been given to xylene placed upon moderately dilute solutions of dodecylamine hydrochloride. In many cases violent disruption of the pure liquid occurs, when it is quietly placed upon a soap or detergent solution. Examination shows that the emulsitied droplets still consist of pure solvent stabilized by a coating of adsorbed protective colloid. The source of the required energy is the energy of adsorption, as well as solubilization of hydrocarbon in the aqueous detergent. The emulsion formed consists of spherical droplets which therefore retain a positive interfacial tension.

Study on Liquid-Bridging Induced Microscale Contact of Two Liquid Droplets

2011 ◽  
Author(s):  
Yuichi Shibata ◽  
Takehiko Yanai ◽  
Osamu Okamoto ◽  
Masahiro Kawaji
Keyword(s):  
Interfacial Tension ◽  
High Speed ◽  
Liquid Droplet ◽  
Dominant Factor ◽  
Contact Method ◽  
Liquid Droplets ◽  
Pendant Drop ◽  
Drop Method ◽  
Surface And Interface ◽  
Pendant Drop Method

The field of microfluidics is developing with advances in MEMS, biotechnology and μ-TAS technologies. In various devices, interfacial energy is a dominant factor for liquid movement in a microchannel. The surface tension and interfacial tension values are necessary to analyze the liquid behavior in the microchannel. Evaluating the values of interfacial tension is especially important for multiphase flow. A pendant drop method is usually used to measure the interfacial tension, however, this method has some inconveniences. For example, the pendant drop method demands strict accuracy for measuring the droplet size when the droplet has a non-spherical shape. Moreover, it needs an accurate value of the density difference between the two liquids. In this work, a new measurement method named “Liquid-bridging Induced Micro Contact Method” has been developed to overcome the weaknesses of the existing methods. In a previous study, we obtained the interfacial tension from bridging of two liquid droplets on the tip of opposing round metal rods. In this study, we have examined the liquid-bridging of two extruded liquid droplets out of a micro glass tube. By measuring the radii of curvature of each liquid surface and interface, we calculate the Laplace pressure on the surface and interface, and derive the interfacial tension value using the Laplace equation. To prove these two methods are reliable, we have compared the results obtained in this experiment to that of the pendant drop method. As a liquid droplet comes into contact with an opposite liquid droplet the phenomenon is recorded using a CCD camera and high speed camera. The results show that the values of interfacial tension obtained from two methods are approximately the same. Therefore, the liquid-bridging induced micro contact method has been shown to be capable of interfacial tension measurements.

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