Dynamic Light Scattering of A Lyotropic Liquid Crystal Lamellar Phase and A Sponge Phase

Oizumi, Junichi; Kimura, Yasuyuki; Ito, Kohzo; Hayakawa, Ritsuko

doi:10.1080/10587259708039407

Cited by 4 publications

(8 citation statements)

References 11 publications

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“…2 with B and K as fitting parameters. Obtained values for B = 0.5 Pa and K = 7.65 × 10 -15 N almost agree with the previous report on the DLS measurement of the confined dilute lamellar phase of nonionic C 12 E 5 / H 2 O system [16]. This consistency suggests that the fast mode can be attributed to the undulation Fig.…”

Section: Resultssupporting

confidence: 91%

“…For the perfectly aligned lamellar phase under strong confinement, only single relaxation behavior originated from the undulation fluctuation is expected as previously reported [16][17][18]. We find, however, that the correlation function always appears to be bimodal, which gives us two characteristic decay rates with different time scales.…”

Section: Resultssupporting

confidence: 83%

“…As previous reports show, the relaxation process of the well aligned lamellar phase under spatial confinement is primary due to the undulation fluctuation of the membranes [16,17]. Membrane displacement fluctuation associated with the concentration fluctuations is governed by the elastic restoring force and dissipation.…”

Section: Resultsmentioning

confidence: 82%

“…Even though all the above reports suggests the importance of the dislocations, there is no compelling observational evidence of the dislocation dynamics. Dynamics of the lamellar phase has been studied by using a dynamic light scattering (DLS) technique [16][17][18]. However, those studies were performed under strong confinement in order to obtain well aligned lamellae without the dislocations.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Notes on the slow dynamics in dilute lyotropic lamellar phase

2019

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In this study, we try to extract the dynamics of the dislocations by measuring the time auto-correlation function of the scattered light intensity in the dilute lamellar phase. Our finding is that the lyotropic lamellar phase shows a bimodal decay of the correlation function. Fitting with the dispersion relation for the undulation fluctuation indicates that the fast mode is attributed to the undulation fluctuation of bilayer membranes. On the other hand, the slow relaxation mode is not explained by the undulation fluctuation. We interpret that the slow mode would be originated from a climb motion of the dislocation. Bimodal relaxation process would be attributed to a heterogeneous distribution of the dislocations in the lamellar structure.

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Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

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Notes on the slow dynamics in dilute lyotropic lamellar phase

2019

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“…12 Dynamic light scattering (DLS) is another quasielastic scattering technique, which provides the possibility to explore collective dynamics inside mesoscopically structured complex fluids exhibiting characteristic lengths up to a few hundred nanometres. In the literature only few publications report on the dynamics of similar samples like polymeric bicontinuous microemulsions, 13 concentrated droplet phases, 14 lamellar and sponge phases [15][16][17][18] using dynamic light scattering experiments. In almost all of these works two relaxation modes were observed.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of the surfactant film bending elasticity in a bicontinuous sugar surfactant based microemulsion: a quasielastic scattering study

Wellert

Karg

Holderer

et al. 2011

Phys. Chem. Chem. Phys.

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Currently, the design of microemulsions is focussed on the formulation of environmentally compatible systems formed by non-harmful amphiphiles and oils. The use of sugar-based surfactants allows the design of microemulsions where, instead of the temperature, the addition of short-or medium-chain alcohols tunes the curvature of the amphiphilic interface. In this work, the resulting temperature stability of a sugar surfactant and rapeseed methyl ester based bicontinuous microemulsion is exploited to study the influence of temperature variations on the bending elastic constant k. Quasi-elastic scattering of light and neutrons is used to separate long-range collective motions and local thermally excited undulations of the interface. k in units of kT is found to be independent of temperature over a wide range.

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Condensed Exponential Correlation Functions in Multicomponent Polymer Blends Measured by X-ray Photon Correlation Spectroscopy

et al. 2006

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X-ray photon correlation spectroscopy experiments were conducted on bicontinuous microemulsion and lamellar phases in polystyrene/polyisoprene/poly(styrene-b-isoprene) blends. Regardless of the microstructure, the scattering intensity autocorrelation function at low temperatures in the vicinity of the primary X-ray scattering peak, g 2 (q,t) (q is the scattering vector), was found to be a condensed exponential, i.e., g 2 (q,t) ∼ exp{-[t/τ(q)] R }with R > 1. This is in direct contrast to previous observations of exponential and stretched exponential correlation functions (R e 1) in microstructured materials comprising polymers as well as small molecules. At higher temperatures, more conventional stretched exponential correlation functions are recovered. We suggest that condensed exponential relaxation functions may be related to the spontaneous breakup of microsctructure.

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Dynamic Light Scattering of A Lyotropic Liquid Crystal Lamellar Phase and A Sponge Phase

Cited by 4 publications

References 11 publications

Notes on the slow dynamics in dilute lyotropic lamellar phase

Notes on the slow dynamics in dilute lyotropic lamellar phase

Temperature dependence of the surfactant film bending elasticity in a bicontinuous sugar surfactant based microemulsion: a quasielastic scattering study

Condensed Exponential Correlation Functions in Multicomponent Polymer Blends Measured by X-ray Photon Correlation Spectroscopy

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