Diffusive dynamics of nanoparticles in ultra-confined media

Jacob, Jack Deodato C.; He, Kai; Retterer, Scott T.; Krishnamoorti, Ramanan; Conrad, Jacinta C.

doi:10.1039/c5sm01437a

Cited by 36 publications

(34 citation statements)

References 52 publications

(106 reference statements)

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“…The experimental data were found to be in agreement with two models, specifically the so-called centerline approximation and cross-sectional averaging (further details about the models can be found in Ref. 32 ), which make predictions for the dependence of the diffusivity on the ratio λ=dNP/P between the diameter dNP of the nanoparticles and the diagonal spacing P between posts. Such agreement suggests that both steric restrictions and hydrodynamic drag may be the cause of the decreased diffusivity of nanoparticles in post arrays.…”

Section: Fig 3 Confinement Affects Colloidal Dynamicssupporting

confidence: 58%

“…In Ref. 32 , both of these features were exploited to investigate the dynamics of nanoparticles diffusing in dense arrays of nanoposts arranged on a square lattice. Owing to the use of image subtractions, DDM analysis made the nanoposts invisible and brought to light the dynamics of the confined nanoparticles, which was inspected for possible anisotropy.…”

Section: B Diffusive Dynamics Of Nanoparticles In Ultra-confined Mediamentioning

confidence: 99%

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Perspective: Differential dynamic microscopy extracts multi-scale activity in complex fluids and biological systems

Cerbino

Cicuta

2017

The Journal of Chemical Physics

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Differential dynamic microscopy (DDM) is a technique that exploits optical microscopy to obtain local, multi-scale quantitative information about dynamic samples, in most cases without user intervention. It is proving extremely useful in understanding dynamics in liquid suspensions, soft materials, cells and tissues. In DDM, image sequences are analyzed via a combination of image differences and spatial Fourier transforms to obtain information equivalent to that obtained by means of light scattering techniques. Compared to light scattering, DDM offers obvious advantages, principally (a) simplicity of setup; (b) possibility of removing static contributions along the optical path; (c) power of simultaneous different microscopy contrast mechanisms; (d) flexibility of choosing an analysis region, analogous to a scattering volume. For many questions, DDM has also advantages compared to segmentation/tracking approaches and to correlation techniques like Particle Image Velocimetry. The very straightforward DDM approach, originally demonstrated with bright field microscopy of aqueous colloids, has lately been used to probe a variety of other complex fluids and biological systems with many different imaging methods, including dark-field, differential interference contrast, wide-field, light-sheet, and confocal microscopy. The number of adopting groups is rapidly increasing and so are the applications. Here, we briefly recall the working principles of DDM, we highlight its advantages and limitations, we outline recent experimental breakthroughs, and we provide a perspective on future challenges and directions. DDM can become a standard primary tool in every laboratory equipped with a microscope, at the very least as a first bias-free automated evaluation of the dynamics in a system.

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Section: Fig 3 Confinement Affects Colloidal Dynamicssupporting

confidence: 58%

Section: B Diffusive Dynamics Of Nanoparticles In Ultra-confined Mediamentioning

confidence: 99%

Perspective: Differential dynamic microscopy extracts multi-scale activity in complex fluids and biological systems

Cerbino

Cicuta

2017

The Journal of Chemical Physics

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“…Interestingly, stretched Gaussian spatial decay has been realized in recent experiments with nano-particles (see Ref. [80][81] in the main paper). Note that for N = 75, 1 ≤ k Cr ≤ 2 but k Ir < 1 (see Fig.…”

Section: Time Evolution Of Exponent Kcrmentioning

confidence: 83%

Static and dynamic properties of two-dimensional Coulomb clusters

2017

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We study the temperature dependence of static and dynamic responses of Coulomb interacting particles in two-dimensional confinements across the crossover from solid- to liquid-like behaviors. While static correlations that investigate the translational and bond orientational order in the confinements show the footprints of hexatic-like phase at low temperatures, dynamics of the particles slow down considerably in this phase, reminiscent of a supercooled liquid. Using density correlations, we probe long-lived heterogeneities arising from the interplay of the irregularity in the confinement and long-range Coulomb interactions. The relaxation at multiple time scales show stretched-exponential decay of spatial correlations in irregular traps. Temperature dependence of characteristic time scales, depicting the structural relaxation of the system, show striking similarities with those observed for the glassy systems, indicating that some of the key signatures of supercooled liquids emerge in confinements with lower spatial symmetries.

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“…The hindered diffusion of particles due to cytoskeletal barriers has been modeled as diffusion in periodic arrays of obstacles . More recent studies include investigations into the diffusive dynamics of nanoparticles confined in nanofabricated pillar arrays . Adsorption rates of solute particles onto planar, spherical, and cylindrical surfaces have also been studied, where it was discovered that surface geometry could be used to control the rates of adsorption .…”

Section: Introductionmentioning

confidence: 99%

Geometry‐Dependent Nonequilibrium Steady‐State Diffusion and Adsorption of Lipid Vesicles in Micropillar Arrays

Liu

Abel

Collins

et al. 2019

Adv Materials Inter

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Micro‐ and nanofabricated sample environments are useful tools for characterizing diffusion in confined aqueous environments. The steady‐state diffusion and adsorption of unilamellar lipid vesicles in arrays of hydrophilic micropillars is investigated. Gradients in the coverage of fluorescently labeled, pillar‐supported lipid films, formed from vesicle fusion, are determined from 3D z‐stack images using confocal microscopy. The gradients are the result of preferential adsorption of vesicles near the tops of the pillars, which progressively deplete them from solution as they diffuse toward the base of the array. However, the increased propensity for vesicle adsorption near the pillar tops compared to the confined spaces between pillars results in the formation of confluent supported lipid bilayers at the pillar tops that resist the adsorption of additional vesicles while leaving the pillar surfaces below available for binding. This results in a reduction in the numbers of depleted vesicles compared to what one would anticipate based on diffusive fluxes. The resulting inhomogeneous spatial profiles of lipid structures on the pillars are the result of the system being maintained in a dissipative, nonequilibrium steady state during incubation of the pillar arrays in the vesicle solution, which is ultimately quenched by rinsing away the unbound, freely diffusing vesicles.

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Diffusive dynamics of nanoparticles in ultra-confined media

Cited by 36 publications

References 52 publications

Perspective: Differential dynamic microscopy extracts multi-scale activity in complex fluids and biological systems

Perspective: Differential dynamic microscopy extracts multi-scale activity in complex fluids and biological systems

Static and dynamic properties of two-dimensional Coulomb clusters

Geometry‐Dependent Nonequilibrium Steady‐State Diffusion and Adsorption of Lipid Vesicles in Micropillar Arrays

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