i) formation of a film at constant capillary pressure
ii) application of external pressure on the film
Formation of microscopic foam and emulsion films, observation of their behaviour and measurements of several physicochemical parameters
Principle is based on the well known Thin Liquid Film – Pressure Balance Technique. Microscopic foam and emulsion films are obtained in a modified Scheludko-Exerowa cell, especially designed for best compatibility within the compact architecture of this instrument. The film thickness is measured interferometrically. The instrument is equipped with a digital camera and allows simultaneous observation of the film and measurement of its thickness, both controlled by a modern Windows software.Instrumental parts
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Zeiss inverse microscope AXIO Observer.A1m equipped with a digital camera and monochromatic light source |
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Hamamatsu H5784-01 photo sensor module |
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Temperature controlled measuring cell in two modifications allowing: i) formation of a film at constant capillary pressure ii) application of external pressure on the film |
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Pressure control unit |
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Features of the instrument |
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Investigations on foam and emulsion film properties both under dynamic (film drainage, critical film thickness of rupture, film lifetime etc.) and equilibrium (film thickness and disjoining pressure, film lifetime etc.) conditions
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Simultaneous measurements of film thickness and disjoining pressure yields the disjoining pressure isotherm | |
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Temperature controlled measuring cell | |
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Image analysis of the video data (e.g. evaluation of film contact angle, for instance via the topographic or film expansion method) |
More information to be downloaded as TFA-1-Info. (*.pdf, in preparation).
A general measuring example is available as TFA-1-Example (*.pdf, in preparation).
SINTERFACE Technologies
Dr. Reinhard Miller & Dr. Alexander Makievski GbR
Volmerstraße 5, D-12489 Berlin, Germany
Phone: +49 30 63923240; Fax: +49 30 63923241; Email: info<at>sinterface<dot>com
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