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Colloidal gas aphrons (CGA): Dispersion and structural features
Author(s) -
Jauregi Paula,
Mitchell Geoffrey R.,
Varley Julie
Publication year - 2000
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690460105
Subject(s) - pulmonary surfactant , colloid , dispersion (optics) , bubble , chemistry , chemical physics , diffraction , chemical engineering , mass transfer , electron microscope , electron diffraction , chromatography , materials science , optics , mechanics , organic chemistry , physics , biochemistry , engineering
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.