Surface-induced assembly of sophorolipids

Jessie Peyre 1 Ahmed Hamraoui 2, 3 Marco Faustini 4 Vincent Humblot 5 Niki Baccile 1, *
* Auteur correspondant
1 SMiLES - Spectroscopie, Modélisation, Interfaces pour L'Environnement et la Santé
LCMCP - Laboratoire de Chimie de la Matière Condensée de Paris
2 MATBIO - Matériaux et Biologie
LCMCP - Laboratoire de Chimie de la Matière Condensée de Paris
4 MHN - Matériaux Hybrides et Nanomatériaux
LCMCP - Laboratoire de Chimie de la Matière Condensée de Paris
Abstract : The surface self-assembly properties of acidic sophorolipids, a bolaform microbial glycolipids with pH-responsive properties in solution, were studied based on the chemical nature of the support and pH of the solution. Sophorolipids generally form micelles in water but formation of morphologies like platelets and twisted fibers depending on pH have also been reported. The surface self-assembly was achieved using dip-coating on three different substrates namely gold, silicon(111) and TiO 2 anatase. Deposition conditions (dip-coating withdrawal speed, relative humidity, temperature) were tested, and it was found that optimum self-assembly occurred at a withdrawal speed of 1 mm s À1 , T of 25 1C and relative humidity of 25%. The local structure of the sophorolipid films was characterized by Atomic Force Microscopy, while Scanning Electron Microscopy was used to characterize the spatial homogeneity. We also attempted to correlate dispersive, electron donor and electron attractor surface energy components, using Good–Van Oss's approach, and the behavior of sophorolipids. We found that when the surface energy is dominated by dispersive components, sophorolipids spontaneously assemble into entangled needles at all pH values (4, 6 and 11). However, when the surface energy is dominated by electronic components, pH has a strong influence on the surface self-assembly. We could discriminate three major organizations: homogeneous layer, isolated aggregates and a two-dimensional network similar to block copolymer surface self-assembly.
Type de document :
Article dans une revue
Physical Chemistry Chemical Physics, Royal Society of Chemistry, 2017, 19, pp.15227-15238 〈10.1039/C7CP01339F〉
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Soumis le : mercredi 7 juin 2017 - 17:16:16
Dernière modification le : jeudi 11 janvier 2018 - 06:27:54
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Jessie Peyre, Ahmed Hamraoui, Marco Faustini, Vincent Humblot, Niki Baccile. Surface-induced assembly of sophorolipids. Physical Chemistry Chemical Physics, Royal Society of Chemistry, 2017, 19, pp.15227-15238 〈10.1039/C7CP01339F〉. 〈hal-01534555〉

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