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A new kind of dispersion - colloidal emulsion aphrons
Deng, T; Dai, YJ; Wang, J
AbstractA new kind of dispersion named as colloidal emulsion aphrons (CEAs) has been prepared and their structure was postulated. They can be considered as the micron-sized water-in-oil (W/O) emulsion-cores encapsulated by a "soapy shell" consisting of multi-layer surfactant molecules. In this work, CEAs were made using span 80 (sorbitan monooleate) as hydrophobic surfactant, NP 10 (nonylphenol ethoxylate) as hydrophilic surfactant and n-heptane as the oil phase. In this dispersion, the emulsion-core sizes are mainly in 10-100 mu m and that of the inner phase droplets are in 1-5 mu m. Some of CEA properties, especially the dispersibility and stability were studied. CEAs disperse more easily in water compared with that of emulsion liquid membranes (ELMs). Some affecting factors, such as deposit time, mixing speed, oil-internal ratio and concentrations of hydrophilic and oil-soluble surfactants on leakages of CEA dispersion were characterized under various conditions by using Co2+ as a tracer ion. In order to gain the high stability and low leakage, suitable surfactant concentrations and oil-inner phase ratio (R-oi) are necessary for CEA preparation. In this study, span 80 and NP 10 were supposed to be in 0.5-2.5% (w/v) and 0.25-0.75% (w/v), respectively and R-oi >= 1. Because of the large interface areas and high dispersibility which CEAs possess, it is hopeful for CEAs to fulfill the requirement of quick extraction without sufficient stirring, such as the treatment of drug overdose or food poisoning. (c) 2005 Elsevier B.V. All rights reserved.
KeywordColloidal Emulsion Aphron Colloidal Liquid Aphron Dispersibility Stability Leakage
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaChemistry
WOS SubjectChemistry, Physical
WOS IDWOS:000232520100012
Citation statistics
Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Tianjin Univ Sci & Technol, Coll Biotechnol, Key Lab Ind Microbiol, Tianjin 300222, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Deng, T,Dai, YJ,Wang, J. A new kind of dispersion - colloidal emulsion aphrons[J]. COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,2005,266(1-3):97-105.
APA Deng, T,Dai, YJ,&Wang, J.(2005).A new kind of dispersion - colloidal emulsion aphrons.COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,266(1-3),97-105.
MLA Deng, T,et al."A new kind of dispersion - colloidal emulsion aphrons".COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 266.1-3(2005):97-105.
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