ISO/TC 91 Grenzflächenaktive Stoffe,
ISO/TC 91 Surface active agents,
ISO/TC 91 Agents de surface,
ISO Internationale Organisation für Normung,
ISO International Organization for Standardization,
ISO Organisation Internationale de Normalisation
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Medientyp:
Norm
Titel:
ISO 9101
:
Surface active agents; Determination of interfacial tension; Drop volume method
Weitere Titel:
Grenzflächenaktive Stoffe; Bestimmung der Grenzflächenspannung; Tropfenvolumen-Methode
Agents de surface; Détermination de la tension interfaciale; Méthode au volume de goutte
Beschreibung:
The volume of a drop of an aqueous phase formed at the end of a vertical capillary tube is measured when it detaches from the tube in contact with the organic phase. The interfacial tension between two liquid phases is obtained by balancing the weight of the drop with the interfacial tension force supporting it and applying a correction factor. Then the interfacial tension is calculated from the volume of the falling drop, the outer capillary radius, the density difference between the two liquid phases and the acceleration due to gravity.