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Kinetics of wetting of a compacted powder by aqueous solutions of surface active agents

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Summary

The capillary rise of aqueous solutions of anionic wetting agents into a compacted powder of an organic chromium complex is discussed on the basis of the Washburn-Rideal equation expanded to account for the porous structure parameters.

At the porosity ∼ 1 —π/6, corresponding to the loosest packing of monodisperse spheres the penetration rate is found to be mostly governed by the effective tensions operative at the moving three phase line of contact in case no deflocculation intervenes.

Zusammenfassung

Der Kapillaraufstieg wässeriger Lösungen anionischer Netzmittel in gepreßtem Pulver eines organischen Chrom-Komplexes wird durch die erweiterte Gleichung vonWashburn-Rideal wiedergegeben, in der die Parameter der porösen Struktur mit einbezogen werden.

Bei der Porosität ∼ 1 —π/6, die der lockersten Anordnung gleichförmiger Kugeln entspricht, wird die Eindringgeschwindigkeit meistens durch die an der sich bewegenden Dreiphasengrenze wirkenden Grenzflächenspannungen bestimmt, wenn keine Peptisation eintritt.

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Authors and Affiliations

  1. Basel, Switzerland

    L. Carino

Authors
  1. L. Carino
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CIBA Geigy AG

Additional information

Paper presented at the XII Intern. Congr. Fat Research, Milan, September 1974.

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Carino, L., CIBA Geigy AG. Kinetics of wetting of a compacted powder by aqueous solutions of surface active agents. Colloid & Polymer Sci 254, 108–113 (1976). https://doi.org/10.1007/BF01526747

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  • DOI: https://doi.org/10.1007/BF01526747

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