منابع مشابه
Deformability of multilamellar vesicles.
Although a free unilamellar vesicle has zero or almost zero genuine surface tension, the multilamellar vesicle ("onion") exhibits a nonzero effective surface tension sigma(eff). The expression for sigma(eff) used in the literature is sigma(eff) approximately square root of kappaB/d(0), where B is the interaction modulus between the vesicle bilayers, d(0) the repeating distance between the bilay...
متن کاملMultilamellar Vesicles in a Commercial Surfactant System
The manufacture of concentrated detergent granules in the detergent industry can be achie®ed by the incorporation of surfactant pastes, such as linear alkylbenzene sulfonate ( ) ( paste LAS a lamellar liquid crystalline material surfactant concentration of ca. 78 ) wt. % . LAS paste was processed at 25 C and 60 C, in both the absence and presence ( ) of sodium disilicate Na O:2SiO additi®e, and...
متن کاملPolyelectrolyte-induced peeling of charged multilamellar vesicles.
We study mixtures of charged surfactants, which alone in solution form uni- and multilamellar vesicles, and oppositely charged polyelectrolytes (PEs). The phase behavior is investigated at fixed surfactant concentration as a function of the PE-to-surfactant charge ratio, x. We find that, for x > 0, aggregates form. Light microscopy and X-ray scattering experiments show that the isoelectric poin...
متن کاملTension and solute depletion in multilamellar vesicles.
We show that a metastable multilamellar vesicle ("onion"), in contact with excess solvent, can spontaneously deplete solute molecules from its interior through an unusual, entropy-driven mechanism. Fluctuation entropy is gained as the uneven partition of solute molecules helps the onion relieve tension in its lamellae. This mechanism accounts for recent experiments on the interaction between un...
متن کاملSmall-angle scattering model for multilamellar vesicles.
A small-angle neutron-x-ray-light-scattering model for multilamellar vesicles is developed on the basis of a simple geometry. N spherical shells with radii of an arithmetic series are allowed for displacements DeltaR which are limited by DeltaR<R/N due to sterical reasons, with R being the radius of the vesicle. The model shows many properties over a large Q range which include a Guinier region...
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ژورنال
عنوان ژورنال: International Journal of Pharmaceutics
سال: 1987
ISSN: 0378-5173
DOI: 10.1016/0378-5173(87)90023-8