Swelling kinetics of a compressed lamellar phase

Leng, Jacques; Nallet, Frédéric; Roux, D.

doi:10.1007/s101890170145

Cited by 27 publications

(35 citation statements)

References 23 publications

(42 reference statements)

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“…As a result, the water goes back into the droplets and the same mechanism starts over, leading to sustained oscillations. Because permeation of water through membranes is a very slow process [21], such a scenario may explain the very large time scales involved in our observations, as suggested in Ref. [10].…”

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confidence: 56%

Observation of Droplet Size Oscillations in a Two-Phase Fluid under Shear Flow

2004

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Experimental observations of droplet size sustained oscillations are reported in a two-phase flow between a lamellar and a sponge phase. Under shear flow, this system presents two different steady states made of monodisperse multilamellar droplets, separated by a shear-thinning transition. At low and high shear rates, the droplet size results from a balance between surface tension and viscous stress, whereas for intermediate shear rates it becomes a periodic function of time. A possible mechanism for such kinds of oscillations is discussed.

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confidence: 56%

Observation of Droplet Size Oscillations in a Two-Phase Fluid under Shear Flow

2004

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“…[40,41] by taking into account the particularity of our system, namely an assembly of soft multilamellar vesicles (onions) whose interlayer distance may vary under shear. Indeed, using neutron scattering, it has been measured that the smectic period of the ordered onion texture decreases as the shear rate is increased whereas it remains constant in the disordered texture [48]. It was assumed that some water is expelled from the onions and lies between the different planes of ordered onions to lubricate the layers.…”

Section: Toy Modelmentioning

confidence: 99%

A spatio-temporal study of rheo-oscillations in a sheared lamellar phase using ultrasound

2004

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Abstract. We present an experimental study of the flow dynamics of a lamellar phase sheared in the Couette geometry. High-frequency ultrasonic pulses at 36 MHz are used to measure time-resolved velocity profiles. Oscillations of the viscosity occur in the vicinity of a shear-induced transition between a high-viscosity disordered fluid and a low-viscosity ordered fluid. The phase coexistence shows up as shear bands on the velocity profiles. We show that the dynamics of the rheological data result from two different processes: (i) fluctuations of slip velocities at the two walls and (ii) flow dynamics in the bulk of the lamellar phase. The bulk dynamics are shown to be related to the displacement of the interface between the two differently sheared regions in the gap of the Couette cell. Two different dynamical regimes are investigated under applied shear stress: one of small amplitude oscillations of the viscosity (δη/η ≃ 3 %) and one of large oscillations (δη/η ≃ 25 %). A phenomenological model is proposed that may account for the observed spatio-temporal dynamics.PACS. 83.10.Tv Structural and phase changes -43.58.+z Acoustical measurements and instrumentation -47.50.+d Non-Newtonian fluid flows

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“…Although some explanations have been proposed in the past, 33 60 the mechanism of vesicle formation using laser heating still remains uncertain. It is known however, that temperature has an influence on lipid behaviour such as; membrane permeability, 34 membranes defects 35 and phase transition. 36 By spreading the membrane material of a MLV completely as monomolecular film onto a hydrophobic surface, 37 and measuring the total area, we experimentally estimated the inter-bilayer distance in MLVs as between 10-15 nm.…”

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confidence: 99%

Heat-induced formation of single giant unilamellar vesicles

et al. 2011

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Giant unilamellar vesicles (GUVs) are an excellent model system for the investigation of lipid membranes, the study of membrane proteins and ion channels in a biomimetic environment, and in the creation of artificial cells. Here, we describe a novel method for the preparation of GUVs from single multilamellar liposomes by means of directed infrared laser heating. Our method generates individual unilamellar vesicles at selected locations, not only from natural and artificial lipid mixtures containing negatively charged lipids, but also from preparations of single lipids, such as neutral phosphatidylethanolamine. The presented method provides a new efficient resource for giant vesicle research and offers an alternative to the electroformation and de/rehydration techniques.

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Swelling kinetics of a compressed lamellar phase

Cited by 27 publications

References 23 publications

Observation of Droplet Size Oscillations in a Two-Phase Fluid under Shear Flow

Observation of Droplet Size Oscillations in a Two-Phase Fluid under Shear Flow

A spatio-temporal study of rheo-oscillations in a sheared lamellar phase using ultrasound

Heat-induced formation of single giant unilamellar vesicles

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