Interfacial Rheological Properties of Different Mixed Surfactant-Nanoparticles Surface Layer (Abstract/Poster in atti di convegno)

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  • Interfacial Rheological Properties of Different Mixed Surfactant-Nanoparticles Surface Layer (Abstract/Poster in atti di convegno) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Alternative label
  • Ravera F.; Liggieri L.; Santini E.; Ferrari M.; Whitby C.; Loglio G.; Dutschk V. (2009)
    Interfacial Rheological Properties of Different Mixed Surfactant-Nanoparticles Surface Layer
    in Workshop of Cost Action D43, Marcoule, France
    (literal)
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  • Ravera F.; Liggieri L.; Santini E.; Ferrari M.; Whitby C.; Loglio G.; Dutschk V. (literal)
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  • In: Workshop of Cost Action D43 \"Functionalized Materials and Interfaces\" (Marcoule, France, 17-19 March 2009). Abstract, pp. 1 - 1. costd43, 2009. (literal)
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  • The utilisation of solid micro/nanoparticles particles, in some cases in association with surfactants, represents an attractive route to control drop/bubble coalescence or liquid film stability in foam and emulsion technology. Even if rather important for these applications, bubble or drop interfacial properties, such as dynamic interfacial tension and dilational rheology, have been poorly investigated in the presence of particles. These investigations are essential to understand situations where particles are associated to surfactants or to achieve film stabilisation by the smallest amount of particles. In fact, the transfer/attachment of nanoparticles to fluid interfaces, driven by their partial wettability, strongly modifies the mechanical properties of the interfacial layers. At large surface coverage, particles can build solid-like barriers to coalescence, such as particle networks, while at low surface coverage, small particles segregating at the interface may play a role more similar to surfactants, affecting equilibrium and dynamic interfacial tension. Previous investigations [1,2] have shown the effectiveness of dilational rheology in providing a better comprehension of dynamic mechanisms occurring in the interfacial layer. In some cases, rheological studies allow in fact the equilibrium and kinetic parameters related to the structure of the particle layer and to the particle interaction to be accessed. Here, we report the results of a study about the properties of composite interfacial layers containing silica or alumina nanoparticles investigated by measuring equilibrium and dynamic interfacial tensions as well as dilational viscoelasticity using bubble/drop tensiometry according to different methodologies. The investigated particles can be utilized as stabilisers for foams and/or emulsions. Different degree of hydrophobicity and consequently different affinity with the water/oil interfaces are obtained by using specific surfactants in dispersion and in t (literal)
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  • CNR-IENI, Genova, Ian Wark Research Institute, University of South Australia, Adelaide (Australia), Leibniz Institute of Polymer Research, Dresden (Germany) (literal)
Titolo
  • Interfacial Rheological Properties of Different Mixed Surfactant-Nanoparticles Surface Layer (literal)
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