Light Scattering of a Concentrated W/O Micro Emulsion; Application of Modern Fluid Theories

Caljé, A. A.; Agterof, W.G.M.; Vrij, A.

doi:10.1007/978-1-4613-4157-4_16

Cited by 30 publications

(12 citation statements)

References 20 publications

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“…-The present calculation of S (q ) goes beyond random mixing to include fluctuations in the arrangement of the oil and water regions. In addition, we necessarily include the effects of concentration fluctuations on the average lattice size C as well, because of equation (2). For a single phase in a constant-volume system, specifying the volume fraction .0, s determines the amount of interface in the system.…”

Section: N Imentioning

confidence: 99%

“…Microemulsions are three-component solutions of water, oil, and surfactant where the oil and water have separated into domains with length scales on the order of tens to hundreds of Angstroms, with a surfactant monolayer at the internal water/oil interface [1]. Some systems form globular domains [2] while others are composed of bicontinuous [3] regions of water and oil with no particular globular structure. These changes in structure (and associated properties such as phase behaviour, interfacial tensions, diffusivity, etc.)…”

mentioning

confidence: 99%

“…Recently, there have been several experimental studies of the structure of bicontinuous microemulsions [16][17][18][19][20]. Globular microemulsions have been extensively studied in the past [2] ; scattering from such systems can often be interpreted in terms of interacting hard sphere models, although some nonspherical systems may also exist [21][22][23]. The structural studies of bicontinuous microemulsions have consisted of light, neutron, and X-ray scattering as well as freeze-fracture microscopy [24].…”

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confidence: 99%

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Correlations and structure factor of bicontinuous microemulsions

et al. 1988

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The correlation functions and structure factor of microemulsions are calculated from a statistical thermodynamic approach which has been previously used to obtain the equilibrium phase diagrams. The structure factor, S (q ), has a peak at a wavevector qmax ~ π/ξ where ξ is the domain size of the oil and water regions. The physical origin of this peak are the correlations induced by the presence of the curvature energy of the surfactant film ; the renormalization of the bending modulus by thermal fluctuations plays an important role in stabilizing these fluctuations. Real space representations of these correlations show that there is significant strength in S(q) from several different wavevectors

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Section: N Imentioning

confidence: 99%

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Correlations and structure factor of bicontinuous microemulsions

et al. 1988

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“…The free energy per unit volume of a system of interacting spheres can be written phenomenologically as [32] :…”

Section: Appendixmentioning

confidence: 99%

Light scattering study of a lower critical consolute point in a micellar system

et al. 1984

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2014 Nous avons étudié les solutions micellaires aqueuses de sulfate de dodécyle et de sodium, butanol et chlorure de sodium. En raison de l'écrantage des forces électrostatiques répulsives par les nuages ioniques et de l'existence de forces attractives entre les micelles (éventuellement reliées à l'hydratation), des points critiques inférieurs de démixtion peuvent être trouvés dans ces mélanges. Nos mesures par diffusion de lumière, de volume et de surface, sont en parfait accord avec les théories du groupe de renormalisation pour les phénomènes critiques. De plus, la région critique apparaît plus large que prévue par les modèles d'Ising décorés utilisés pour décrire les points critiques inférieurs.Abstract 2014 We have studied aqueous micellar solutions of sodium dodecyl sulfate, butanol and sodium chloride. Due to the screening of electrostatic repulsive forces by the ionic atmosphere and to the existence of attractive forces (possibly related to hydration) between the micelles, lower critical consolute points can be found in these mixtures. Our data from surface and bulk light scattering are in perfect agreement with the renormalization group theories for critical phenomena. Moreover, the critical region happens to be wider than that predicted by the decorated Ising models used to describe lower critical consolute points.

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“…There are indications that the overall fit can be improved by the introduction of an attractive well. 33 Hitherto, we have assumed that the particle dispersions were monodisperse, which seldom occurs in practice. To assess the influence of polydispersity on our analysis we corrected the hard sphere contribution to aP]ap with the term in brackets in eqn (4.6).…”

Section: Fig 3-plots Of /3(aplap) -S C M / R ~~mentioning

confidence: 99%

Application of modern concepts in liquid state theory to concentrated particle dispersions

Vrij¹,

Nieuwenhuis²,

Fijnaut³

et al. 1978

Faraday Discuss. Chem. Soc.

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Theories on liquid structure properties are applied to concentrated colloidal dispersions in nonpolar media. Light scattering experiments on microemulsions (W/O) with benzene and toluene as the continuous phases are characterized in terms of a hard sphere repulsion and a perturbative attraction. The origin of the attraction and the influence of polydispersity on particle size are discussed. Light scattering of crosslinked PMMA-latex particles in benzene as a function of scattering angle showed structure formation at higher latex concentrations. The results were discussed in terms of the structure factor S(K), susceptibility x(K) and the radial distribution function g ( v ) of the particle centres. The latex behaves as an " expanded " liquid structure. This structure formation was also reflected in the diffusion coefficient measured by quasi-elastic light scattering.

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Light Scattering of a Concentrated W/O Micro Emulsion; Application of Modern Fluid Theories

Cited by 30 publications

References 20 publications

Correlations and structure factor of bicontinuous microemulsions

Correlations and structure factor of bicontinuous microemulsions

Light scattering study of a lower critical consolute point in a micellar system

Application of modern concepts in liquid state theory to concentrated particle dispersions

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