Colloidal gas aphrons (CGA): Dispersion and structural features

被引:62
作者
Jauregi, P
Mitchell, GR
Varley, J [1 ]
机构
[1] Univ London Imperial Coll Sci Technol & Med, Dept Chem Engn & Chem Technol, London SW7 2B7, England
[2] Delft Univ Technol, Kluyver Inst Biotechnol, NL-2628 BC Delft, Netherlands
[3] Univ Reading, Dept Phys, Reading RG6 6AP, Berks, England
关键词
D O I
10.1002/aic.690460105
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Colloidal gas aphrons (CGA) have previously been defined as surfactant stabilized gas microbubbles and characterized for a number of surfactants in terms of stability, gas holdup and bubble size even though there is no conclusive evidence of their structure (that is, orientation of surfactant molecules at the gas-liquid interface, thickness of gas-liquid interface, and/or number of surfactant layers). Knowledge of the structure would enable us to use these dispersions more efficiently for their diverse applications (such as for removal of dyes, recovery of proteins, and enhancement of mass transfer in bioreactors). This study investigates dispersion and structural features of CGA utilizing a range of novel predictive (for prediction of aphron size and drainage rate) and experimental (electron microscopy and X-ray diffraction) methods. Results indicate structural differences between foams and CGA, which may have been caused by a multilayer structure of the latter as suggested by the electron and X-ray diffraction analysis.
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页码:24 / 36
页数:13
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