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Related Experiment Videos

Nonionic block copolymer antifoams.

K S Joshi1, S A K Jeelani, C Blickenstorfer

  • 1Laboratory of Food Process Engineering, Institute of Food Science and Nutrition, Swiss Federal Institute of Technology, ETH-Zentrum, Schmelzbergstrasse 7, 8092 Zürich, Switzerland.

Langmuir : the ACS Journal of Surfaces and Colloids
|July 26, 2006
PubMed
Summary

Alkoxylated alcohol block copolymer (BCP) drops act as effective antifoams by promoting bubble coalescence. Antifoaming efficiency is temperature-dependent, peaking with BCP gel formation, and enhanced by hydrophobic particle inclusion.

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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Rheology

Background:

  • Antifoams are crucial in industrial processes to control foam formation.
  • Alkoxylated alcohol block copolymers (BCP) are explored for their potential as novel antifoaming agents.
  • Understanding the mechanism of BCPs in foam destabilization is key to optimizing their performance.

Purpose of the Study:

  • To investigate the antifoaming properties of aqueous BCP dispersions.
  • To elucidate the role of BCP droplets in bubble coalescence and foam destabilization.
  • To determine the influence of temperature and particle modification on antifoaming efficiency.

Main Methods:

  • Two-bubble technique with CCD imaging to observe bubble coalescence.
  • Macroscopic foam column tests for antifoaming efficiency measurements.

Related Experiment Videos

  • Oscillatory thermo-rheometry, SAXS, DSC, and NMR to characterize BCP structure and gelation.

    • Main Results:

    • BCP droplets were observed to enhance bubble coalescence.
    • Antifoaming efficiency exhibited a temperature optimum around 26°C, correlating with BCP gelation.
    • Gel formation in BCP solutions above 20 wt% was confirmed by rheology and structural analyses.
    • Embedding hydrophobic particles in BCP drops significantly boosted antifoaming performance.

    Conclusions:

    • Alkoxylated alcohol block copolymers effectively function as antifoams by facilitating bubble coalescence.
    • The antifoaming performance is strongly linked to temperature-induced BCP gelation and interfacial properties.
    • Modification of BCP drops with hydrophobic particles offers a route to enhance antifoaming efficiency.