Surface and Bulk Elasticity Determined Fluctuation Regimes in Smectic Membranes

Sikharulidze, Irakli; Faragó, B.; Dolbnya, Igor P.; Madsen, Anders; Jeu, Wim H. de

doi:10.1103/physrevlett.91.165504

Cited by 41 publications

(34 citation statements)

References 21 publications

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“…It has been noted earlier 5,22 that this form allows for heterodyne mixing, i.e., the intensity autocorrelation function contains besides the usual quadratic terms ͓C zz ͑q ʈ , ͔͒ 2 also terms linear in the correlation functions C zz ͑q , ͒. To see this we insert Eq.…”

Section: A Surface Scattering Geometrymentioning

confidence: 99%

Effects of partial coherence on correlation functions measured by x-ray photon correlation spectroscopy

Gutt¹,

Ghaderi

Tolan

et al. 2008

Phys. Rev. B

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We present a rigorous description of the effects of partial coherence and detector resolution on intensity autocorrelation functions as they can be measured by x-ray photon correlation spectroscopy ͑XPCS͒. Based on the Huygens-Fresnel propagation law and on the first Born approximation, we derive a general expression for the normalized intensity autocorrelation function. We calculate how the mutual coherence function of the x-ray beam propagates from an aperture to the sample and how it propagates after the scattering process to the detector area and consequently influences the intensity autocorrelation function. We illustrate our calculation with examples of XPCS intensity autocorrelation functions of liquid surfaces calculated for grazing incidence geometry.

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Section: A Surface Scattering Geometrymentioning

confidence: 99%

Effects of partial coherence on correlation functions measured by x-ray photon correlation spectroscopy

Gutt¹,

Ghaderi

Tolan

et al. 2008

Phys. Rev. B

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“…X-ray Photon Correlation Spectroscopy (XPCS) is a relatively new technique [1], successfully used to study the dynamics of soft-matter systems, such as colloidal dispersions [2,3], fluid interfaces [4,5] and free-standing smectic films [6][7][8]. Although conceptually very similar to the traditional Dynamic Light Scattering (DLS) technique, its main advantages with respect to DLS are the potential of reaching much higher scattering wavevectors and the fact that it is much less affected by multiple scattering.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of bulk fluctuations in a lamellar phase studied by coherent x-ray scattering

et al. 2006

Self Cite

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Using X-ray photon correlation spectroscopy, we studied the layer fluctuations in the lamellar phase of an ionic lyotropic system. We measured the relaxation rate of in-plane (undulation) fluctuations as a function of the wave vector. Static and dynamic results obtained during the same experiment were combined to yield the values of both elastic constants of the lamellar phase (compression and bending moduli) as well as that of the sliding viscosity. The results are in very good agreement with dynamic light scattering data, validating the use of the technique in ordered phases.

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“…Time-resolved versions of the scattering techniques, i.e. x-ray photon correlation spectroscopy (XPCS) and neutron spin-echo (NSE), have emerged as powerful probes of the microscopic dynamics in these soft and fragile systems [39]. However, long-time relaxation phenomena, like collective diffusion, or more sophisticated mechanisms of relaxation like reptation motions, arm retractions, etc.…”

Section: Introductionmentioning

confidence: 99%

Dynamics in Ultrathin Films: Particle Tracking Microrheology of Langmuir Monolayers

Bonales¹,

Ritacco²,

Rubio³

et al. 2007

TOPCJ

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Particle tracking has been shown to be a powerful technique for measuring bulk and interfacial rheology of fluids. The Brownian motion of microparticles trapped at interfaces is very sensitive to the viscosity of the subphase, and to the contact angle of the particles. The Stokes-Einstein relation is fulfilled if the friction factor is properly taken into account. The diffusion coefficient of the latex microparticles spread on surfactant monolayers allows one to calculate the shear viscosity of the monolayer using Danov's theory. Good agreement was found with previous results for monolayers of pentadecanoic acid. The method has also been used to study monolayers of n-dodecanol. Moreover, the shear viscosity of a polymer monolayer has been calculated by particle tracking, and the results show good agreement with data obtained by canal viscosimetry. The temperature dependence of the shear viscosity shows the existence of a glass transition for monolayers of poly(4-hydroxystyrene).

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Surface and Bulk Elasticity Determined Fluctuation Regimes in Smectic Membranes

Abstract: Sikharulidze, I.; Farago, B.; Dolbnya, I.P.; Madsen, A.; de Jeu, W.H.

Cited by 41 publications

References 21 publications

Effects of partial coherence on correlation functions measured by x-ray photon correlation spectroscopy

Effects of partial coherence on correlation functions measured by x-ray photon correlation spectroscopy

Dynamics of bulk fluctuations in a lamellar phase studied by coherent x-ray scattering

Dynamics in Ultrathin Films: Particle Tracking Microrheology of Langmuir Monolayers

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