Sizing multimodal suspensions with differential dynamic microscopy

Bradley, Joe J.; Martinez, Vincent A.; Arlt, Jochen; Royer, John R.; Poon, Wilson C. K.

doi:10.1039/d3sm00593c

Cited by 5 publications

(1 citation statement)

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“…The characterization of such processes in terms of the ISF is of relevance since new alternatives to single-particle tracking have been developed to study the motion of microswimmers [51,52,[58][59][60][61][62][63]. Differential dynamic microscopy (DDM) allows to directly measure the ISF and provides statistics in a way that complements single-particle tracking and overcomes some of its shortcomings.…”

Section: Discussionmentioning

confidence: 99%

Active Brownian particle under stochastic orientational resetting

Baouche,

Franosch,

Meiners

et al. 2024

New J. Phys.

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We employ renewal processes to characterize the spatiotemporal dynamics of an active Brownian particle under stochastic orientational resetting. By computing the experimentally accessible intermediate scattering function (ISF) and reconstructing the full time-dependent distribution of the displacements, we study the interplay of rotational diffusion and resetting. The resetting process introduces a new spatiotemporal regime reflecting the directed motion of agents along the resetting direction at large length scales, which becomes apparent in an imaginary part of the ISF. We further derive analytical expressions for the low-order moments of the displacements and find that the variance displays an effective diffusive regime at long times, which decreases for increasing resetting rates. At intermediate times the dynamics are characterized by a negative skewness as well as a non-zero non-Gaussian parameter.

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Section: Discussionmentioning

confidence: 99%

Active Brownian particle under stochastic orientational resetting

Baouche,

Franosch,

Meiners

et al. 2024

New J. Phys.

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Differential Dynamic Microscopy: Diffusion Measurements Where You Want Them

Zhang,

Fu,

Zhang

et al. 2023

Macromolecules

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Differential dynamic microscopy (DDM) is an emerging tool for the measurement of diffusion coefficients of macromolecules, especially in the form of particles or aggregates. It combines the benefits of microscopy�versatile modes of imaging, ability to locate regions of interest in structured systems, conventional light sources that do not require laser training, very small samples, and easy sample preparation�with many of the traditional benefits of dynamic light scattering (DLS). After introducing the method in terms that will be familiar to DLS users, examples are presented in ascending order of complexity. Reflecting the learning process of newcomers to DDM, the progression goes from simple latex spheres in free solution to the exquisite capabilities of DDM to explore specific regions of structured, inhomogeneous samples and work efficiently in challenging situations, such as encapsulated particles or colored solutions of conjugated backbone polymers in aggressive solvents at high temperatures. The very different user experiences provided by DDM and DLS are described and compared to multiple particle tracking (MPT). The Perspective closes with a glimpse into DDM's bright future.

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