We describe an instrument combining the advantages of two methods, axisymmetric drop shape analysis for well-deformed drops and capillary pressure tensiometry for spherical drops, both used for measuring the interfacial tension and interfacial rheological parameters. The rheological parameters are the complex interfacial elasticity, and the surface elasticity and viscosity of Kelvin–Voigt and Maxwell rheological models. The instrument is applicable for investigation of the effect of different types of surfactants (nonionic, ionic, proteins, and polymers) on the interfacial rheological properties both of air/water and oil/water interfaces, and of interfaces between liquids with equal mass densities. A piezodriven system and a specially designed interface unit, implemented in the instrument, ensure precise control for standard periodic waveforms of surface deformation (sine, square, triangle, and sawtooth) at a fixed frequency, or produce surface deformation at constant rate. The interface unit ensures accurate synchronization between the pressure measurement and the surface control, which is used for real-time data processing and feedback control of drop area in some of the applications.
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October 2008
Research Article|
October 27 2008
Instrument and methods for surface dilatational rheology measurements
Stoyan C. Russev;
Stoyan C. Russev
1Department of Solid State Physics, Faculty of Physics,
University of Sofia
, Sofia 1164, Bulgaria
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Nikola Alexandrov;
Nikola Alexandrov
2Laboratory of Chemical Physics and Engineering, Faculty of Chemistry,
University of Sofia
, 1164 Sofia, Bulgaria
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Krastanka G. Marinova;
Krastanka G. Marinova
a)
2Laboratory of Chemical Physics and Engineering, Faculty of Chemistry,
University of Sofia
, 1164 Sofia, Bulgaria
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Krassimir D. Danov;
Krassimir D. Danov
2Laboratory of Chemical Physics and Engineering, Faculty of Chemistry,
University of Sofia
, 1164 Sofia, Bulgaria
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Nikolai D. Denkov;
Nikolai D. Denkov
2Laboratory of Chemical Physics and Engineering, Faculty of Chemistry,
University of Sofia
, 1164 Sofia, Bulgaria
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Lyudmil Lyutov;
Lyudmil Lyutov
3Department of General and Inorganic Chemistry, Faculty of Chemistry,
University of Sofia
, Sofia 1164, Bulgaria
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Vassil Vulchev;
Vassil Vulchev
4Department of General Physics, Faculty of Physics,
University of Sofia
, Sofia 1164, Bulgaria
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Christine Bilke-Krause
Christine Bilke-Krause
5KRÜSS GmbH,
Wissenschaftliche Laborgeräte
, 22453 Hamburg, Germany
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a)
Author to whom the correspondence should be addressed. Electronic mail: km@lcpe.uni-sofia.bg.
Rev. Sci. Instrum. 79, 104102 (2008)
Article history
Received:
February 22 2008
Accepted:
September 24 2008
Citation
Stoyan C. Russev, Nikola Alexandrov, Krastanka G. Marinova, Krassimir D. Danov, Nikolai D. Denkov, Lyudmil Lyutov, Vassil Vulchev, Christine Bilke-Krause; Instrument and methods for surface dilatational rheology measurements. Rev. Sci. Instrum. 1 October 2008; 79 (10): 104102. https://doi.org/10.1063/1.3000569
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