The Strength of Long-Range Forces across Thin Liquid Films

The Strength of Long-Range Forces across Thin Liquid Films

We present experimental results on the instability of thin liquid polydimethylsiloxane films intercalated between a solid substrate and a liquid surrounding medium. The instability is induced by long-range van der Waals forces across the film. From the characteristic wavelength of the instability an...

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Veröffentlicht in:Journal of colloid and interface science 1999-06, Vol.214 (1), p.126-128
Hauptverfasser: Reiter, Günter, Sharma, Ashutosh, Khanna, Rajesh, Casoli, Alain, David, Marie-Odile
Format: Artikel
Sprache:eng
Schlagworte:
Chemistry
contact angle
Exact sciences and technology
General and physical chemistry
instability
Solid-liquid interface
Surface physical chemistry
thin liquid films
van der Waals forces
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container_end_page 128
container_issue 1
container_start_page 126
container_title Journal of colloid and interface science
container_volume 214
creator Reiter, Günter
Sharma, Ashutosh
Khanna, Rajesh
Casoli, Alain
David, Marie-Odile
description We present experimental results on the instability of thin liquid polydimethylsiloxane films intercalated between a solid substrate and a liquid surrounding medium. The instability is induced by long-range van der Waals forces across the film. From the characteristic wavelength of the instability and from the apparent contact angle of the equilibrium structures, we deduce an effective Hamaker constant (A132) about 2–3 orders of magnitude higher than what is expected from calculations based on the individual Hamaker constants. With air as the surrounding medium, we obtain the expected values.
doi_str_mv 10.1006/jcis.1999.6158
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subjects Chemistry
contact angle
Exact sciences and technology
General and physical chemistry
instability
Solid-liquid interface
Surface physical chemistry
thin liquid films
van der Waals forces
title The Strength of Long-Range Forces across Thin Liquid Films
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