Coherent X-rays as a new probe for the investigation of the dynamics of opaque colloidal suspensions

Robert, Aymeric; Wagner, Joachim; Autenrieth, Tina; Härtl, W.; Grübel, G.

doi:10.1016/j.jmmm.2004.11.014

Cited by 17 publications

(17 citation statements)

References 6 publications

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“…In the case of magnetic colloids Robert et al, 2005), a magnetic field orders the particles (Wiedenmann & Heinemann, 2005) and the diffusion process of the magnetic particles becomes anisotropic (Lal et al, 2001). …”

Section: Concentrated Systemsmentioning

confidence: 99%

Diffraction with a coherent X-ray beam: dynamics and imaging

Livet

2007

Acta Cryst Sect A

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Methods for carrying out coherent X‐ray scattering experiments are reviewed. The brilliance of the available synchrotron sources, the characteristics of the existing optics, the various ways of obtaining a beam of controlled coherence properties and the detectors used are summarized. Applications in the study of the dynamics of speckle patterns are described. In the case of soft condensed matter, the movement of inclusions like fillers in polymers or colloidal particles can be observed and these can reflect polymer or liquid‐crystal fluctuations. In hard condensed‐matter problems, like phase transitions, charge‐density waves or phasons in quasicrystals, the study of speckle fluctuations provides new time‐resolved methods. In the domain of lensless imaging, the coherent beam gives the modulus of the sample Fourier transform. If oversampling conditions are fulfilled, the phase can be obtained and the image in the direct space can be reconstructed. The forthcoming improvements of all these techniques are discussed.

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Section: Concentrated Systemsmentioning

confidence: 99%

Diffraction with a coherent X-ray beam: dynamics and imaging

Livet

2007

Acta Cryst Sect A

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“…See Robert et al . [] for details of the frequency‐length scales of these techniques. The typical values for seismological studies [ Jackson , ] are also shown to highlight the extrapolation that is required to translate between laboratory data and seismic observables.…”

Section: Effects Of the Spin Transitionmentioning

confidence: 99%

Effects of the Electronic Spin Transitions of Iron in Lower Mantle Minerals: Implications for Deep Mantle Geophysics and Geochemistry

Lin

Speziale

Mao

et al. 2013

Reviews of Geophysics

220

194

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[1] We have critically reviewed and discussed currently available information regarding the spin and valence states of iron in lower mantle minerals and the associated effects of the spin transitions on physical, chemical, and transport properties of the deep Earth. A high-spin to low-spin crossover of Fe 2+ in ferropericlase has been observed to occur at pressure-temperature conditions corresponding to the middle part of the lower mantle. In contrast, recent studies consistently show that Fe 2+ predominantly exhibits extremely high quadrupole splitting values in the pseudo-dodecahedral site (A site) of perovskite and post-perovskite, indicative of a strong lattice distortion. Fe 3+ in the A site of these structures likely remains in the high-spin state, while a high-spin to low-spin transition of Fe 3+ in the octahedral site of perovskite occurs at pressures of 15-50 GPa. In post-perovskite, the octahedral-site Fe 3+ remains in the low-spin state at the pressure conditions of the lowermost mantle. These changes in the spin and valence states of iron as a function of pressure and temperature have been reported to affect physical, chemical, rheological, and transport properties of the lower mantle minerals. The spin crossover of Fe 2+ in ferropericlase has been documented to affect these properties and is discussed in depth here, whereas the effects of the spin transition of iron in perovskite and post-perovskite are much more complex and remain debated. The consequences of the transitions are evaluated in terms of their implications to deep Earth geophysics, geochemistry, and geodynamics including elasticity, element partitioning, fractionation and diffusion, and rheological and transport properties.Citation: Lin, J.-F., S. Speziale, Z. Mao, and H. Marquardt (2013), Effects of the electronic spin transitions of iron in lower mantle minerals: Implications for deep mantle geophysics and geochemistry, Rev. Geophys., 51, 244-275,

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“…Over the past decade, X-ray Photon Correlation Spectroscopy (XPCS) has emerged as a valuable tool for the study of dynamics in soft matter [3][4][5][6][7] . The technique has two principle advantages over the well established technique of Dynamic Light Scattering (DLS): the first is that the shorter wavelengths allow for measurements at larger scattering vectors (smaller size scales); the second is that X-ray measurements do not suffer from multiple scattering.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of hard sphere suspensions using dynamic light scattering and X-ray photon correlation spectroscopy: Dynamics and scaling of the intermediate scattering function

Martinez

Thijssen

Zontone

et al. 2011

The Journal of Chemical Physics

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Intermediate Scattering Functions (ISF's) are measured for colloidal hard sphere systems using both Dynamic Light Scattering (DLS) and X-ray Photon Correlation Spectroscopy (XPCS). We compare the techniques, and discuss the advantages and disadvantages of each. Both techniques agree in the overlapping range of scattering vectors. We investigate the scaling behaviour found by Segre and Pusey 1 but challenged by Lurio et al. 2 . We observe a scaling behaviour over several decades in time but not in the long time regime. Moreover, we do not observe long time diffusive regimes at scattering vectors away from the peak of the structure factor and so question the existence of a long time diffusion coefficients at these scattering vectors.

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Coherent X-rays as a new probe for the investigation of the dynamics of opaque colloidal suspensions

Cited by 17 publications

References 6 publications

Diffraction with a coherent X-ray beam: dynamics and imaging

Diffraction with a coherent X-ray beam: dynamics and imaging

Effects of the Electronic Spin Transitions of Iron in Lower Mantle Minerals: Implications for Deep Mantle Geophysics and Geochemistry

Dynamics of hard sphere suspensions using dynamic light scattering and X-ray photon correlation spectroscopy: Dynamics and scaling of the intermediate scattering function

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