About entangled networks of worm-like micelles: a rejected hypothesis

Aliotta, F.; Fontanella, M. E.; Sacchi, M.; Vasi, C.; Manna, Gianfranco La; Turco-Liveri, V.

doi:10.1007/bf00654738

Cited by 18 publications

(8 citation statements)

References 17 publications

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“…A linear dependence of the radius with w was obtained over the explored range, indicating the presence of spherical non interacting aggregates. Similar values were reported by Aliotta et al [30] from a small-angle neutron scattering study of lecithin with cyclohexane as the organic phase and by Shinoda et al [21] when the microemulsion is formed with 1-propanol as co-surfactant. …”

Section: Microemulsion Characterisationsupporting

confidence: 82%

Photophysical properties of the phenoxazin dyes resazurin and resorufin in soybean lecithin microemulsions

et al. 2011

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Section: Microemulsion Characterisationsupporting

confidence: 82%

Photophysical properties of the phenoxazin dyes resazurin and resorufin in soybean lecithin microemulsions

et al. 2011

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“…The same packing parameter can be evaluated from SANS data at W 0 ) 14 (in the presence of cylindrical geometry 27 ) and in correspondence of the phase boundary (where spherical droplets are present 45 ), thus confirming the validity of the proposed model. This evidence can be useful in order to reconcile scattering experiments performed at low (LS, 3,15 SANS 27 which are fully consistent with a wormlike model) and at high (SANS, 46 where the presence of spherical droplets is suggested) PC concentration.…”

Section: Discussionmentioning

confidence: 57%

Water Diffusion and Headgroup Mobility in Polymer-like Reverse Micelles: Evidence of a Sphere-to-Rod-to-Sphere Transition

et al. 1998

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A pulsed gradient spin-echo FT 1 H NMR study on the system soybean lecithin/water/perdeuterated cyclohexane is presented. The self-diffusion coefficient of water, D w , was measured as a function of the water content (W 0 ) and was found to show a bell-shaped trend. The composition at which the maximum in D w occurs is the same at which the viscosity is the highest. We rationalize the rising part of the plot in terms of a water diffusion inside wormlike reverse micelles which increase their length upon increasing W 0 . On the contrary, the descending part indicates a rod-to-sphere evolution of the aggregate's shape. This interpretation is supported by measurement on the headgroup rotation by dielectric spectroscopy. The composition at which a structural transition occurs and the location of the phase boundary can be predicted by a geometrical model in which the effective packing parameter is equal to 1.58. This value is in agreement with small-angle neutron scattering data in the literature.

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“…The authors of ref. 22) have also experimentally obtained a similar distribution but have fitted their results with a Weibull function.…”

Section: Analytical and Numerical Predictions Versus Experimentsmentioning

confidence: 69%

“…Some authors 22,23) have claimed that the use of equilibrium polymers as a model for worm-like micelles is inappropriate since the theoretical treatments predict only scaling laws for the dependence of pLP on b. This is true for the first developments made in the mean-field approximation 5) .…”

Section: Analytical and Numerical Predictions Versus Experimentsmentioning

confidence: 96%

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Equilibrium polymerization: towards a numerical description of the dynamics of wormlike micelles

Rouault¹

1999

Macromol. Theory Simul.

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SUMMARY: The self-diffusion of surfactant in a system of cylindrical, polymer-like micelles is studied for high concentrations in the framework of the equilibrium polymerization model. The different types of coarse grained dynamic equilibrium-polymers algorithms are first briefly reviewed and commented. The results suggest that the self-diffusion is dominated by the smallest species, in marked contrast with rheological experiments showing the behaviour of the slowest (i. e. longest) chains. The self-diffusion coefficient D is described using Phillies' formalism. An analysis of the experimental and simulational results suggests that the dependence D l b -1.5 is found without the ansatz of the presence of entanglements.

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About entangled networks of worm-like micelles: a rejected hypothesis

Cited by 18 publications

References 17 publications

Photophysical properties of the phenoxazin dyes resazurin and resorufin in soybean lecithin microemulsions

Photophysical properties of the phenoxazin dyes resazurin and resorufin in soybean lecithin microemulsions

Water Diffusion and Headgroup Mobility in Polymer-like Reverse Micelles: Evidence of a Sphere-to-Rod-to-Sphere Transition

Equilibrium polymerization: towards a numerical description of the dynamics of wormlike micelles

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