The capacitive drop tensiometer: a novel multianalysing technique for measuring the properties of liquids

Wang, C.H., Augousti, A.T., Mason, J. and McMillan, N.D. (1999) The capacitive drop tensiometer: a novel multianalysing technique for measuring the properties of liquids. Measurement Science and Technology, 10(1), pp. 19-24. ISSN (print) 0957-0233

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Abstract

A new instrumental method for measuring the physical properties of a liquid has been developed. The instrument, called a capacitive drop tensiometer (CDT), is based on the drop volume principle in combination with a capacitive transducer. A delivery head with a specialized wetting design was constructed for forming drops. The capacitive transducer uses the delivery head as one of its plates and a cylindrical ring plate, which surrounds the delivery head and the space occupied by the drop that is formed, as another. Excellent linearity is achieved by optimizing the design, with an accuracy of drop volume measurement of approximately 2 mu l. The system is suitable for measuring both drops in equilibrium and those in the process of growing. Its capability of real-time measurement makes it particularly useful for volatile liquids, in which instance the measurement of drop volume using a flowmeter or a pump is no longer reliable. The CDT can also be used to determine concentration. It was found that the concentration curve is linear for aqueous glycerol solutions although not so for aqueous ethanol solutions. The CDT's ability to measure surface tension was also explored and experimental results are presented here.

Item Type: Article
Uncontrolled Keywords: liquids, viscosity, surface tension, drops, capacitance, tensiography, environmental monitoring, industrial monitoring, interfacial-tension
Research Area: Physics
Faculty, School or Research Centre: Faculty of Science (until 2011) > School of Life Sciences
Faculty of Science (until 2011)
Depositing User: Katrina Clifford
Date Deposited: 09 Sep 2008
Last Modified: 24 Sep 2010 15:25
URI: http://eprints.kingston.ac.uk/id/eprint/3079

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