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Surface properties and sub-surface aggregate assimilation of rhamnolipid surfactants in different aqueous systems
Zulfiqar Ali Raza1, Zafar M Khalid, Mohammad Saleem Khan
1Department of Applied Sciences, National Textile University, Faisalabad, 37610, Pakistan. zarazapk@yahoo.com
Abstract:
Tensioactive properties of rhamnolipids produced by a Pseudomonas aeruginosa strain were investigated in the presence or absence of Sr(2+) or Pb(2+). Surface and interfacial properties, and aggregate forming properties and morphologies were studied by various techniques including scanning electron microscopy. When the pH of a rhamnolipid aqueous solution (40 mg/l) was increased from 5 to 8, irregular vesicles gradually took the shape of oligo-vesicles, then regular vesicles and finally smaller spherical vesicles. Addition of metal ions controlled the aggregates' morphology and stability, and influenced the surface and interfacial behavior of rhamnolipid solutions.
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