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

Constantin, Doru; Brotons, Guillaume; Salditt, Tim; Freyssingeas, Éric; Madsen, Anders

doi:10.1103/physreve.74.031706

Cited by 11 publications

(9 citation statements)

References 25 publications

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“…3 , Methods). While the compression modulus B is also accessible by other methods, such as X-ray reflectometry 6 , 10 , 27 , 28 it has not been previously possible to directly measure the in-plane viscosity within this time and size regime (nanoseconds and nanometers) as well as possible deviations of the interface layer compression modulus from the bulk value in the vicinity of a solid substrate. Here it should also be mentioned, that using the Caillé exponent approach 29 as used in some of the other publications is an indirect method, as compared to the method presented here.…”

Section: Discussionmentioning

confidence: 99%

“…The links between the cellular behaviour and properties of phospholipid membranes are treated in a review by Tanaka 4 . Investigations of such systems have been carried out using a wide range of methods, such as light-scattering 3 , atomic force microscopy (AFM) 5 , X-ray scattering 6 – 12 as well as elastic 10 , 13 and inelastic 7 , 14 , 15 neutron scattering. An overview of neutron scattering methods used to investigate phospholipid membranes was presented by Fragneto and Rheinstädter 16 , while Salditt focused on X-ray scattering 10 .…”

Section: Introductionmentioning

confidence: 99%

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Nanoscale rheology at solid-complex fluid interfaces

Jaksch

Holderer

Gvaramia

et al. 2017

Sci Rep

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Here we present an approach to measure dynamic membrane properties of phospholipid membranes close to an interface. As an example we show results of the membrane dynamics of a phospholipid membrane multilayer-stack on a solid substrate (silicon). On this sample we were able to measure local interaction and friction parameters using Grazing Incidence Neutron Spin Echo Spectroscopy (GINSES), where an evanescent neutron wave probes the fluctuations close to a rigid interface. With this method it is possible to access length scales in the nano to micrometer region as well as energies in the μeV range. Using a new neutron resonator structure we achieved the required intensity gain for this experiment. During our investigations we found an excitation mode of the phospholipid membrane that has not been reported previously and only became visible using the new methodology. We speculate that the energy transported by that undulation can also serve to distribute energy over a larger area of the membrane, stabilizing it. This new methodology has the capability to probe the viscoelastic effects of biological membranes, becoming a new tool for tribology on the nanoscale and has allowed the observation of the hitherto invisible property of phospholipid membranes using neutrons.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nanoscale rheology at solid-complex fluid interfaces

Jaksch

Holderer

Gvaramia

et al. 2017

Sci Rep

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“…The lateral domain structure of the aligned membranes as well as the height fluctuations of membranes lead to a random phase variation of the exit wave, giving rise to a pronounced speckle pattern at and around the first lamellar Bragg peak. Note that the pronounced thermal height fluctuations in the lamellar stack typical for smectic liquid crystals are probed quasi-instantaneously in this scheme by a pulse length in the range of 100 f s. As a result, the diffraction pattern does not average out to a smooth lineshape as in conventional experiments [9][10][11]. As the high spatial coherence of the X-ray pulses is one of the key properties of Free-Electron Laser radiation [12][13][14], in particular for applications of single pulse coherent X-ray imaging, we have analyzed the recorded speckle patterns in view of the spatial coherence properties, similar to the statistical optics approach by Goodman [15].…”

Section: Introductionmentioning

confidence: 89%

Single pulse coherence measurements in the water window at the free-electron laser FLASH

et al. 2013

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The spatial coherence of free-electron laser radiation in the water window spectral range was studied, using the third harmonic (λ<(3rd) = 2.66 nm) of DESY's Free-electron LASer in Hamburg (FLASH). Coherent single pulse diffraction patterns of 1,2-Dioleoyl-sn-glycero-3-phosphocholine (DOPC) multilamellar lipid stacks have been recorded. The intensity histogram of the speckle pattern around the first lamellar Bragg peak, corresponding to the d = 5 nm periodicity of the stack, reveals an average number of transverse modes of M¯ = 3.0 of the 3rd harmonic. Using the lipid stack as a 'monochromator', pulse-to-pulse fluctuations in the third harmonic λ(3rd) have been determined to be 0.033 nm.

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“…Constantin et al examined an ionic lamellar phase of SDS/pentanol/H 2 O. In this system the observed modes were overdamped and resulted in exponential relaxations with a much stronger wavevector dependence than free standing smectic membranes of 4O.8 and FPP.…”

Section: Recent Studies Using Xpcsmentioning

confidence: 97%

X‐ray Photon Correlation Spectroscopy Studies of Surfaces and Thin Films

2014

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The technique of X-ray Photon Correlation Spectroscopy (XPCS) is reviewed as a method for studying the relatively slow dynamics of materials on time scales ranging from microseconds to thousands of seconds and length scales ranging from microns down to nanometers. We focus on the application of this technique to study dynamical fluctuations of surfaces, interfaces and thin films. We first discuss instrumental issues such as the effects of partial coherence (or alternatively finite instrumental resolution) and optimization of signal-to-noise ratios in the experiments. We then review what has been learned from recent XPCS studies of capillary wave fluctuations on liquid surfaces and polymer films, of nanoparticles used as probes to study the interior dynamics of polymer films, of liquid crystals and multilamellar surfactant films, and of metal surfaces, and magnetic domain wall fluctuations in antiferromagnets. We then discuss studies of non-equilibrium dynamics described by 2-time correlation functions. Finally, we briefly speculate on possible future XPCS experiments at new synchrotron sources currently under development including studies of dynamics on time scales down to femtoseconds.

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

Cited by 11 publications

References 25 publications

Nanoscale rheology at solid-complex fluid interfaces

Nanoscale rheology at solid-complex fluid interfaces

Single pulse coherence measurements in the water window at the free-electron laser FLASH

X‐ray Photon Correlation Spectroscopy Studies of Surfaces and Thin Films

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