Some Aspects of Emulsion Instability on Using Sorbitan Monooleate (Span 80) as a Surfactant in Liquid Emulsion Membranes

Extraction and concentration of cobalt from acidic leach solutions containing Co–Ni by emulsion liquid membrane using TOA as extractant

“…This figure indicates that, although Span 80 gives higher rate of extraction in the first 10 min compared to ECA 4360J, it gradually deteriorates with time. This is in agreement with the results reported in various studies which indicate that the membrane formed with Span 80 shows less resistance to mass transfer than that formed with other surfactants, but it suffers from some drawbacks: as osmotic swelling, poor chemical stability due to hydrolysis, and macroemulsion formation [28][29][30][31][32][33]. It is also reported that ECA 4360J can form very stable emulsions compared to Span 80 [34][35][36][37][38], but it has also some shortcomings, such as higher interfacial mass transfer resistance [36,37] and interactions with organic and inorganic acids [30].…”

Spontaneous Microstructure Formation at Water/Paraffin Oil Interfaces

“…SPAN80 is a lipophilic surfactant (HLB=4.3) consisting mainly is sorbitan monooleate 29 . The properties of water in contact with organic liquids containing SPAN80 were mostly investigated to describe interfacial rheology and emulsion stability 5,[30][31][32][33][34][35][36][37][38][39] .…”

Surfactant-mediated water transport at gelatin gel/oil interfaces

“…It would also not be an easy task, since Span80 is not a singlecomponent material [42,43], but a mixture of different sorbitan esters (monooleate-the major component, dioleate, trioleate and tetraoleate) and other start and byproduct (after contact with water) materials like: oleic acid, the very hydrophilic sorbitol and sorbitol isosorbide. In principle, different constituents of the Span80 could be involved in different SE mechanisms (as was mentioned in Section 1).…”