Results from the research program MAP-FASES: investigation of the adsorption kinetics and the dilational rheology of non-ionic surfactants on board the Space Shuttle Columbia during the mission STS-107 (Abstract/Poster in atti di convegno)

Type
Label
  • Results from the research program MAP-FASES: investigation of the adsorption kinetics and the dilational rheology of non-ionic surfactants on board the Space Shuttle Columbia during the mission STS-107 (Abstract/Poster in atti di convegno) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • Liggieri L.; Ravera F.; Ferrari M.; Loglio G.; Miller R.; Makievski A.; Kraegel J. (2006)
    Results from the research program MAP-FASES: investigation of the adsorption kinetics and the dilational rheology of non-ionic surfactants on board the Space Shuttle Columbia during the mission STS-107
    in EUFOAM 2006 : 6th European Conference on Foams, Emulsions and Applications, Potsdam, Germany
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Liggieri L.; Ravera F.; Ferrari M.; Loglio G.; Miller R.; Makievski A.; Kraegel J. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • EUFOAM 2006 : 6th European Conference on Foams, Emulsions and Applications (Potsdam, Germany, 2-6 July 2006). (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#descrizioneSinteticaDelProdotto
  • Understanding the influence of adsorption kinetics and of the surface rheological properties of surfactants layers on the stability of foams and emulsions is a challenging scientific task and an important technological need. The research programme \"Fundamental and Applied Studies in Emulsion Stability (FASES)\", involving several European laboratories from academic and industrial institutions, has been funded by the European Space Agency to respond to this need. In this framework key experiments performed under weightlessness conditions (microgravity) are sided to an extensive development of experimental tools and models and production of benchmark data. The project develops accordingly to a hierarchy of three investigation levels: surfactant layers at interfaces, liquid films, droplet interactions and emulsion (foam) stability. For each investigation level, microgravity provides simplified experimental conditions to access specific properties and to test models. Thus it will be possible to investigate emulsion destabilisation as driven by droplet coalescence and aggregation in the absence of creaming. Moreover adsorption at single interfaces can be investigated under purely diffusive conditions for surfactant transport and exchange. Accordingly, the adsorption kinetics and the surface dilational rheology of surfactants adsorbed at liquid/oil and liquid/air interfaces have been investigated onboard the Space Shuttle Columbia , during the STS-107 mission. To this aim a specific experimental module - FAST (Facility for Adsorption and Surface Tension studies) - has been developed. This module houses two Capillary Pressure tensiometers and allows the response of dynamic interfacial/surface to imposed perturbation of the interfacial area of a drop/bubble to be investigated. This tensiometric technique is particularly suitable for the utilisation in weightlessness condition, which, in fact, provides spherical droplets and simplified dynamic conditions. Here a summary of the more significant results obtained for the model non-ionic surfactants C10E8 and C12DMPO, respectively adsorbed at water/hexane and water/air interface is given. Adsorption kinetics has been investigated by surface area stress/relaxation experiments and the surface visco-elasticity has been measured according to the Oscillating Bubble/Drop method in a wide frequency range. Owing to weightlessness conditions, these experiments warranted measurements of excellent quality, also in frequency and concentration ranges not accessible on ground. Moreover the analysis of the results provides a check/confirmation of new models available for dilational rheology and gives direct evidence of the validity the classical hypothesis underlying the development of these models. (literal)
Titolo
  • Results from the research program MAP-FASES: investigation of the adsorption kinetics and the dilational rheology of non-ionic surfactants on board the Space Shuttle Columbia during the mission STS-107 (literal)
Prodotto di
Autore CNR
Insieme di parole chiave

Incoming links:


Prodotto
Autore CNR di
Insieme di parole chiave di
data.CNR.it