Direction Dependent Diffusion of Aligned Magnetic Rods by Means of X-Ray Photon Correlation Spectroscopy

Wagner, Joachim; Märkert, Christian; Fischer, Birgit; Müller, Leonard

doi:10.1103/physrevlett.110.048301

Cited by 20 publications

(14 citation statements)

References 29 publications

(35 reference statements)

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“…In addition, TISANE enables determination of the rotational diffusion of magnetoor electroactive complex nanosized fluids, where a conventional depolarized dynamic light scattering analysis is typically hampered by extended particle concentration and turbidity of the sample. Moreover, the TISANE technique complements X-ray photon correlation spectroscopy (Wagner et al, 2013), measuring the translational diffusion on optically opaque suspensions.…”

Section: Discussionmentioning

confidence: 99%

Sub-millisecond time-resolved small-angle neutron scattering measurements at NIST

et al. 2020

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Instrumentation for time-resolved small-angle neutron scattering measurements with sub-millisecond time resolution, based on Gä hler's TISANE (timeinvolved small-angle neutron experiments) concept, is in operation at NIST's Center for Neutron Research. This implementation of the technique includes novel electronics for synchronizing the neutron pulses from high-speed counterrotating choppers with a periodic stimulus applied to a sample. Instrumentation details are described along with measurements demonstrating the utility of the technique for elucidating the reorientation dynamics of anisometric magnetic particles.

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Section: Discussionmentioning

confidence: 99%

Sub-millisecond time-resolved small-angle neutron scattering measurements at NIST

et al. 2020

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“…This enabled the measurement of velocity fluctuations at the early stage of sedimentation in brownian colloidal suspensions [110]. Similar approach is required for probing the anisotropic dynamics in an applied magnetic field [106,109] and in confined geometry of microfluidic channels [111]. In these cases, the measured microstructure and dynamics display strong anisotropy.…”

Section: Equilibrium Dynamicsmentioning

confidence: 97%

“…The time scale accessible by XPCS is determined by the scattering power of the sample, available coherent photon flux, and detector capabilities. The main applications of XPCS have been to probe the dynamics of colloids, especially those that are turbid in visible light [106] and slow dynamics in arrested systems such as gels [29] and glasses [27]. Faster dynamics at a given q can be accessed with a point detector [106]; however, an additional limitation is the onset of radiation damage with longer exposure of the sample to the X-ray beam.…”

Section: Equilibrium Dynamicsmentioning

confidence: 99%

“…The main applications of XPCS have been to probe the dynamics of colloids, especially those that are turbid in visible light [106] and slow dynamics in arrested systems such as gels [29] and glasses [27]. Faster dynamics at a given q can be accessed with a point detector [106]; however, an additional limitation is the onset of radiation damage with longer exposure of the sample to the X-ray beam. In dilute suspensions of Brownian particles, the dynamics is purely diffusive, and g 2 (q, t) decays by an exponential function and the decay rate is related to the diffusion coefficient, D 0 .…”

Section: Equilibrium Dynamicsmentioning

confidence: 99%

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Synchrotron Scattering Methods for Nanomaterials and Soft Matter Research

Narayanan

Konovalov

2020

Materials

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This article aims to provide an overview of broad range of applications of synchrotron scattering methods in the investigation of nanoscale materials. These scattering techniques allow the elucidation of the structure and dynamics of nanomaterials from sub-nm to micron size scales and down to sub-millisecond time ranges both in bulk and at interfaces. A major advantage of scattering methods is that they provide the ensemble averaged information under in situ and operando conditions. As a result, they are complementary to various imaging techniques which reveal more local information. Scattering methods are particularly suitable for probing buried structures that are difficult to image. Although, many qualitative features can be directly extracted from scattering data, derivation of detailed structural and dynamical information requires quantitative modeling. The fourth-generation synchrotron sources open new possibilities for investigating these complex systems by exploiting the enhanced brightness and coherence properties of X-rays.

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“…Systems with tunable aspect ratio are even rarer. As model systems for prolate particles, e.g., goethite, [22][23][24][25] hematite, [26][27][28] polymer particles, 29 and viruses like tobacco mosaic viruses [30][31][32][33] or fd viruses [34][35][36] have been described. With regard to oblate particles, gibbsite platelets are available as a model system.…”

Section: Introductionmentioning

confidence: 99%

Depolarized light scattering from prolate anisotropic particles: The influence of the particle shape on the field autocorrelation function

Passow

Hagen

Löwen

et al. 2015

The Journal of Chemical Physics

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We provide a theoretical analysis for the intermediate scattering function typically measured in depolarized dynamic light scattering experiments. We calculate the field autocorrelation function g1(VH)(Q,t) in dependence on the wave vector Q and the time t explicitly in a vertical-horizontal scattering geometry for differently shaped solids of revolution. The shape of prolate cylinders, spherocylinders, spindles, and double cones with variable aspect ratio is expanded in rotational invariants flm(r). By Fourier transform of these expansion coefficients, a formal multipole expansion of the scattering function is obtained, which is used to calculate the weighting coefficients appearing in the depolarized scattering function. In addition to translational and rotational diffusion, especially the translational-rotational coupling of shape-anisotropic objects is considered. From the short-time behavior of the intermediate scattering function, the first cumulants Γ(Q) are calculated. In a depolarized scattering experiment, they deviate from the simple proportionality to Q(2). The coefficients flm(Q) strongly depend on the geometry and aspect ratio of the particles. The time dependence, in addition, is governed by the translational and rotational diffusion tensors, which are calculated by means of bead models for differently shaped particles in dependence on their aspect ratio. Therefore, our analysis shows how details of the particle shape--beyond their aspect ratio--can be determined by a precise scattering experiment. This is of high relevance in understanding smart materials which involve suspensions of anisotropic colloidal particles.

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Direction Dependent Diffusion of Aligned Magnetic Rods by Means of X-Ray Photon Correlation Spectroscopy

Cited by 20 publications

References 29 publications

Sub-millisecond time-resolved small-angle neutron scattering measurements at NIST

Sub-millisecond time-resolved small-angle neutron scattering measurements at NIST

Synchrotron Scattering Methods for Nanomaterials and Soft Matter Research

Depolarized light scattering from prolate anisotropic particles: The influence of the particle shape on the field autocorrelation function

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