Surface properties and sub-surface aggregate assimilation of rhamnolipid surfactants in different aqueous systems |
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| Authors: | Zulfiqar Ali Raza Zafar M Khalid Mohammad Saleem Khan Ibrahim M Banat Asma Rehman Abdul Naeem Muhammad Tahir Saddique |
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| Institution: | (1) Department of Applied Sciences, National Textile University, Faisalabad, 37610, Pakistan;(2) National Institute for Biotechnology and Genetic Engineering, Faisalabad, Pakistan;(3) National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, Pakistan;(4) School of Biomedical Sciences, University of Ulster, Coleraine, BT52 1SA, Northern Ireland, UK |
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| Abstract: | Tensioactive properties of rhamnolipids produced by a Pseudomonas aeruginosa strain were investigated in the presence or absence of Sr2+ or Pb2+. 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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