http://www.cnr.it/ontology/cnr/individuo/prodotto/ID15146
Viscoelastic properties of insoluble amphiphiles at the air/water interface (Articolo in rivista)
- Type
- Label
- Viscoelastic properties of insoluble amphiphiles at the air/water interface (Articolo in rivista) (literal)
- Anno
- 2006-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1016/j.jcis.2005.08.045 (literal)
- Alternative label
Miano, F.; Winlove, C.P.; Lambusta, D.; Marletta, G. (2006)
Viscoelastic properties of insoluble amphiphiles at the air/water interface
in Journal of colloid and interface science (Print); Editore: Elsevier, Oxford (Regno Unito)
(literal)
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- Miano, F.; Winlove, C.P.; Lambusta, D.; Marletta, G. (literal)
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- ISI Web of Science (WOS) (literal)
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- a SIFI S.p.A., via E. Patti 36, 95020 Lavinaio (CT), Italy;
b School of Physics, Stocker Rd., Exeter EX4 4QL, UK;
c Istituto CNR di Chimica Biomolecolare, Sezione CT, via del Santuario 110, 95028 Valverde (CT), Italy;
d Dipartimento di Scienze Chimiche, viale Andrea Doria, 695125 Catania, Italy (literal)
- Titolo
- Viscoelastic properties of insoluble amphiphiles at the air/water interface (literal)
- Abstract
- The effects of the presence of a molecular monolayer on the dilatational properties of the air/water interface have been investigated. Two
water insoluble amphiphiles, dipalmitoyl phosphatidyl choline and quercetin 3-O-palmitate, were spread onto a pendant drop and the dynamic
surface pressure was measured by means of drop shape analysis. The surface dilatational elasticity and viscosity of the spread monolayers were
also determined by the oscillating drop technique. Constraints on the range of measuring conditions were investigated and we demonstrated that
the pressure-area isotherms derived from oscillatory dynamic measurements display phase behaviour similar to that found in equilibrium measurements,
albeit at reduced resolution. Both the amphiphiles formed purely elastic films that were characterised by a dilatational modulus that
depended on the surface concentration and obeyed a power scaling law. The exponent of the relationship could be related to the thermodynamic
conditions prevailing at the interface. The phospholipid monolayer scaling exponent was 2.8 in a temperature range of 20-26 oC indicates a
favourable solvency of molecules in the bidimensional matrix. A very high scaling exponent (11.8 at 7 oC) for quercetin palmitate was interpreted
assuming that molecules self-organise in fibre-like structures. This interface structure and the phase behaviour was found consistent with observations
of the surface film obtained by Brewster angle microscopy. The structured quercetin 3-O-palmitate monolayers are disrupted by temperature
increase or by adding a 0.2 molar fraction of the immiscible dipalmitoyl phosphatidyl choline. (literal)
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