Wettability of Aqueous Rhamnolipids Solutions Produced by Pseudomonas aeruginosa LBI
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Data
2009-05-01
Autores
Costa, Siddhartha G. V. A. O. [UNESP]
de Souza, Sandro R. [UNESP]
Nitschke, Marcia
Franchetti, Sandra Mara M. [UNESP]
Jafelicci, Miguel [UNESP]
Lovaglio, Roberta B. [UNESP]
Contiero, Jonas [UNESP]
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Editor
Springer Heidelberg
Resumo
The wetting behavior of rhamnolipids produced by Pseudomonas aeruginosa LBI strain grown on waste oil substrate and sodium dodecyl sulfate (SDS) on glass, polyethylene terephthalate (PET), poly(vinyl chloride) (PVC), poly(epsilon-caprolactone) (PCL) and polymer blend (PVC-PCL) was investigated by the measuring contact angle of sessile drops, to determine the wetting characteristics of rhamnolipids. The comparison of the wetting profiles showed that at low SDS and rhamnolipid concentrations, the contact angle increased and when the concentration of the surfactant increased further, the contact angle decreased. The blend surface (PVC-PCL) showed better wettability than the homopolymers themselves and the blend changed the surface hydrophobicity of the polymer, making it more hydrophilic. The rhamnolipids produced by the LBI strain exhibited superior wetting abilities than the chemical surfactant SDS one. This is the first work that evaluates the wetting properties of rhamnolipids on polymer blends.
Descrição
Palavras-chave
Surfactants, Rhamnolipids, SDS, Wetting, Contact angle, Adsorption
Como citar
Journal of Surfactants and Detergents. Heidelberg: Springer Heidelberg, v. 12, n. 2, p. 125-130, 2009.