Dilational Rheology to Investigate the Dynamics of Surfactant and Particle-Laden Interfacial Layers (Abstract/Poster in convegno)

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  • Dilational Rheology to Investigate the Dynamics of Surfactant and Particle-Laden Interfacial Layers (Abstract/Poster in convegno) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Alternative label
  • Ravera F.; Liggieri L.; Ferrari M.; Santini E. (2009)
    Dilational Rheology to Investigate the Dynamics of Surfactant and Particle-Laden Interfacial Layers
    in 13th IACIS International Conference on Surface and Colloid Science and the 83rd ACS Colloid & Surface Science Symposium, New York, USA
    (literal)
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  • Ravera F.; Liggieri L.; Ferrari M.; Santini E. (literal)
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  • In: IACIS2009 - 13th IACIS International Conference on Surface and Colloid Science and the 83rd ACS Colloid & Surface Science Symposium (New York, USA, 14-19 June 2009). Abstract, pp. 1 - 1. Iacis, 2009. (literal)
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  • The mechanical behaviour of liquid interfaces has a large reie'ance for many technological and natural processes involv ng multiphase systems subjected to dynamic conditions. This behaviour is mainly related to the dynamic characteristics of the interfacial layers, like the interfacial tension variation under the effect of changes of the available interfacial area, i.e, the dilational rheology Dilational rheology studies are usually based on the measurement of the dilational viscoelasticity using drop/bubble tensiometers which allow this quantity to be measured as a frequency function and during the ageing of the adsorbed layer. This kind of investi gations are effective for accessing the mechanisms at the bases of the relaxation processes occurring in the interfacial layer. Here a review of the principal theoretical models providing rela tionships between dilational viscoelasticity and dynamic interfa cial properties is presented together with selected experimental results on ionic and non-ionic surfactants, proteins and mixed surfactant nanoparticle layers, at different liquid-liquid or liquidair interfaces. Measurements have been performed using two oscillating drop! bubble techniques: one based on the elaboration of the drop profile (Profile Analysis Tensiometer) and the other on the direct measurement of capillary pressure (Capillary Pressure Tensiome ter).The coupling of these two methods allows for measurements in a larger frequency range spanning over about 5 decades. The results show that, according to appropriate experimental methodology and interpreting the data with the recently devel oped models, these techniques can be very effective to advance in the comprehension of the dynamic interfacial properties. (literal)
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  • CNR-IENI, Genova (literal)
Titolo
  • Dilational Rheology to Investigate the Dynamics of Surfactant and Particle-Laden Interfacial Layers (literal)
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