Spontaneous Curvature-induced pearling instability

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Abstract
We investigate the instability of a tubular fluid membranes made of a water soluble surfactant. The tubules are obtained at high salinities. The instability is due to the introduction within the vesicle multilayer of an alkane. We measure the wavelength of this instability versus the unperturbed radius of the tubules. To interpretthis dependance we use a model that includes not only the surface tension in the elastic energy but the spontaneous curvature as well. The spontaneous curvature is induced by the presenceof the oil in the bilayer of the membrane and give a selection of a non-zero wavelength.

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