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Descripción
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| A theory is provided for a common experimental set up that is used to measure surface properties in surfactant monolayers. The set up consists in a shallow liquid layer that is compressed/expanded in a periodic fashion by moving two parallel, slightly immersed solid barriers, which vary the free surface area and thus the surfactant concentration. The simplest theory ignores the uid dynamics in the bulk fluid, assuming spatially uniform surfactant concentration, which requires quite small forcing frequencies and provides reversible dynamics in the compression/expansion cycles. In this article, we present a long wave theory for not so slow oscillations that assumes local equilibrium but takes the uid dynamics into account. In particular, this theory uncovers the physical mechanisms involved in the surfactant behavior and allows for extracting more information from each experimental run. The conclusion is that the fluid dynamics cannot be ignored, and that some irreversible dynamics could well have a fluid dynamics origin. | |
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Internacional
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Si |
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Nombre congreso
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CoWet Summer School 2015 |
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Tipo de participación
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960 |
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Lugar del congreso
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Madrid |
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Revisores
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Si |
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ISBN o ISSN
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00000000 |
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DOI
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Fecha inicio congreso
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31/08/2015 |
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Fecha fin congreso
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04/09/2015 |
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Desde la página
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1 |
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Hasta la página
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1 |
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Título de las actas
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Proceedings of CoWet Summer School 2015 |