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The determination of contact angles of aqueous surfactant solutions on powders

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  • Colloid Science
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The wetting behaviour of aqueous sodium dodecyl sulphate solutions on polyester, polyamide, aluminium and graphite powders has been studied.

The method described is based on the unopposed penetration of the liquid into a plug of powder packed in a glass tube. Using theWashburn equation for the flow of a liquid through a capillary, it is possible to calculate from the rate of penetration the magnitude of the advancing contact angle and the work of adhesion between the liquid and the powder. The results show details as to the mechanism of adsorption of the surface-active molecules on polymer and metal surfaces.


Die Benetzung von wässrigen Natriumdodecylsulphatlösungen auf Polyester-, Polyamid-, Aluminium- und Graphitpulvern wurde studiert. Die Methode beruht auf dem spontanen Fließen der Flüssigkeit in einem mit dem Pulver gepackten Glasrohr. Mit Hilfe derWashburnschen Gleichung für das Fließen einer Flüssigkeit durch Kapillaren ist es möglich, aus der Durchdringungsgeschwindigkeit den Wert der fortschreitenden Kontaktwinkel und die Adhäsionsarbeit zwischen Flüssigkeit und Pulver zu berechnen.

Die Ergebnisse zeigen Einzelheiten hinsichtlich des Mechanismus der Adsorption von grenzflächenaktiven Molekülen an polymeren und metallischen Oberflächen.

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Bruil, H.G., van Aartsen, J.J. The determination of contact angles of aqueous surfactant solutions on powders. Colloid & Polymer Sci 252, 32–38 (1974).

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