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Titolo:
Effect of fructose, sucrose, and dimethyl sulfoxide on the equilibrium thickness of DMPC foam films
Autore:
Krasteva, N; Krustev, R; Muller, HJ; Vollhardt, D; Mohwald, H;
Indirizzi:
Max Planck Inst Colloids & Interfaces, D-14476 Golm, Germany Max Planck Inst Colloids & Interfaces Golm Germany D-14476 Golm, Germany
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 6, volume: 105, anno: 2001,
pagine: 1185 - 1190
SICI:
1520-6106(20010215)105:6<1185:EOFSAD>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHASE-TRANSITIONS; FREE-ENERGY; SURFACE; DIMYRISTOYLPHOSPHATIDYLCHOLINE; PRESERVATION; LIPOSOMES; BILAYERS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Krasteva, N Max Planck Inst Colloids & Interfaces, D-14424 Potsdam, Germany Max Planck Inst Colloids & Interfaces Potsdam Germany D-14424
Citazione:
N. Krasteva et al., "Effect of fructose, sucrose, and dimethyl sulfoxide on the equilibrium thickness of DMPC foam films", J PHYS CH B, 105(6), 2001, pp. 1185-1190

Abstract

Foam films stabilized by phospholipids are applied for model studies of interactions between lipid layers. The thickness of the free-standing foam films, obtained from aqueous lipid dispersions of DMPC in the presence of lowmolecular weight sugars fructose and sucrose, and dimethyl sulfoxide (DMSO), was measured by means of the microinterometric technique. The equilibrium film thickness is determined by the interplay of the different componentsof the disjoining pressure and it is influenced by the composition of the film forming dispersion. In the absence of solutes and electrolyte DMPC forms Newton black films. The addition of sugars and DMSO results in an increase in the film thickness, which is attributed to an increase in the surfacepotential. In this case, the electrostatic disjoining pressure determines the film thickness, while the van der Waals attraction is not significantlyinfluenced by the solutes. The effective Hamaker constants are obtained from the velocity of film thinning. The double layer potential phi (o) of thethick films is calculated according to the postulations of the DLVO theory. Stable black films are obtained at high salt concentration in the presence of sugars and DMSO. In these thin films, the short-range structural forces control the equilibrium thickness, which increases in the presence of sugars and decreases in the presence of DMSO. The changes in the film thickness caused by the solutes are attributed to modified hydration interactions. The observed thickness changes correspond to inclusion or removal of several layers of water molecules in the film aqueous core.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/04/20 alle ore 19:31:07