Foams Stabilized by Multilamellar Polyglycerol Ester Self-Assemblies

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• 作者：Corina Curschellas ; Joachim Kohlbrecher ; Thomas Geue ; Peter Fischer ; Bertrand Schmitt ; Martine Rouvet ; Erich J. Windhab ; Hans J枚rg Limbach
• 刊名：Langmuir
• 出版年：2013
• 出版时间：January 8, 2013
• 年：2013
• 卷：29
• 期：1
• 页码：38-49
• 全文大小：720K
• 年卷期：v.29,no.1(January 8, 2013)
• ISSN：1520-5827

文摘

The importance of surfactant self-assemblies in foam stabilization is well-known. The aim of the current study was to investigate the self-assemblies of the nonionic surfactant polyglycerol ester (PGE) in bulk solutions, at the interface and within foams, using a combined approach of small-angle neutron scattering, neutron reflectivity, and electron microscopy. PGE bulk solutions contain vesicles as well as open lamellar structures. Upon heating of the solutions the lamellar spacing increases, with significant differences in the presence of NaCl or CaCl₂ as compared to the standard solution. The adsorption of the multilamellar structures present in the bulk solutions lead to a multilayered film at the air鈥搘ater interface. The ordering within this film was increased as a result of a 20% area compression mimicking a coalescence event. Finally, PGE foams were shown to be stabilized not only by strong interfacial films but also by agglomerated self-assemblies within the interstitial areas of the foams.