Microgravity investigations on the physico-chemical properties of liquid films by Liquid Film Tensiometer (LIFT) (Abstract/Poster in convegno)

Type
Label
  • Microgravity investigations on the physico-chemical properties of liquid films by Liquid Film Tensiometer (LIFT) (Abstract/Poster in convegno) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Alternative label
  • L. Liggieri, F. Ravera, E. Santini, M. Ferrari, J. Krägel, A.V. Makievski, R. Miller,G. Loglio (2011)
    Microgravity investigations on the physico-chemical properties of liquid films by Liquid Film Tensiometer (LIFT)
    in ECIS 2011, Berlin- Germany
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • L. Liggieri, F. Ravera, E. Santini, M. Ferrari, J. Krägel, A.V. Makievski, R. Miller,G. Loglio (literal)
Note
  • Poster (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR-Institute for Energetics and Interphases, Genova, Italy Max Planck Institute of Colloids and Interfaces, Golm-Potsdam, Germany SINTERFACE Technologies, Berlin, Germany Univ. of Florence, Dept. of Chemistry, Sesto Fiorentino, Italy (literal)
Titolo
  • Microgravity investigations on the physico-chemical properties of liquid films by Liquid Film Tensiometer (LIFT) (literal)
Abstract
  • The physico-chemical properties of liquid films, which determine their stability in time and against perturbations, are quite directly related to the properties of the corresponding emulsions and foams [1]. Studying these properties is then important to establish quantitative models useful to setup products and processes in the field of foams and emulsions. Microgravity can be a particularly effective environment where the physico-chemical characteristics of liquid films can be investigated. In fact the thinning and destabilisation of the liquid-film is driven by two major drainage processes, by capillarity and gravitational forces, respectively. The latter can be strongly attenuated by weightlessness, allowing for investigating the film thinning as subjected to capillarity alone. The experiment LIFT (Liquid-Film Tensiometer), supported by the Italian Space Agency, is conceived to investigate the dynamic properties of the film by means of a specific tensiometric technique, developed in the field of Capillary Pressure Tensiometry [2]. Such technique, already implemented in the ESA facility FASTER (Facility for Adsorption and Surface TEnsion Research) for Columbus EDR, was already shown to be very suitable to study single liquid interfaces under microgravity. LIFT is in fact being designed to be housed inside the facility FASTER. LIFT allows the dynamic tension of liquid films to be measured during its evolution and/or drainage via capillary pressure method as well as its thickness by means of an advanced interferometric technique. Moreover being this technique also appropriate for measuring the response of the film tension to perturbations of its interfacial area, investigations of the film dilational rheology can be performed, which are particularly relevant for emulsion and foam studies. The present contribution is aimed at providing an overview of the LIFT programme, giving a description of the techniques to be utilized and of the planned experiments and reporting some results obtained with the laboratory prototypes. References: [1] Y.H. Kim, K Koczo, D. T. Wasan, J. Colloid Interface Sci.,187 (1997) 29 [2] V.I. Kovalchuk; J. Krägel, A.V. Makievski, F. Ravera, L. Liggieri, G. Loglio, V.B. Fainerman, R. Miller, J. Colloid Interface Sci., 280 (2004) 498 (literal)
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