Particle sedimentation: effect of polymer concentration on particle–particle interaction

Kourki, Hajir; Famili, Mohammad Hossein Navid

doi:10.1016/j.powtec.2011.12.050

Cited by 37 publications

(21 citation statements)

References 18 publications

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“…Ganguly et al [26] demonstrated that the sedimentation velocity decreases as a function of the concentration because of the increased magnitude of the hydrodynamic interactions between particles. Kourki and Famili [27] observed the same decreasing trend of sedimentation velocity when investigating the sedimentation of silica nanoparticles. Coglitore et al [23] explained the low values of diffusion coefficient obtained from experiments by considering that, at low concentrations, nanoparticle motion is almost entirely controlled by collisions with fluid molecules and the particle-particle interaction can be neglected.…”

Section: Effect Of Size On Nanoparticle Sedimentation-diffusion Equilsupporting

confidence: 52%

Sedimentation-Diffusion Behaviour of Nanoparticles

Giorgi¹,

Macko²,

Curran³

et al. 2020

Preprint

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Background The biological response of organisms exposed to nanoparticles is often studied in vitro using adherent monolayers of cultured cells. In order to derive accurate concentration-response relationships, it is important to determine the local concentration of nanoparticles to which the cells are actually exposed rather than the nominal concentration of nanoparticles in the cell-culture medium. In this study, we investigated the sedimentation–diffusion process of different sized and charged gold nanoparticles in vitro by evaluating their settling dynamics and by developing a theoretical model to predict the concentration depth-profile of nanoparticles in solution over time.Results Experiments were carried out in water and in cell-culture media at a range of controlled temperatures. The optical phenomenon of caustics was exploited to track nanoparticles in real-time in a conventional optical microscope without any requirement for fluorescent labelling that potentially affects the dynamics of the nanoparticles. The results obtained demonstrate that size, temperature, and the stability of the nanoparticles play a pivotal role in regulating settling dynamics of nanoparticles. For gold nanoparticles larger than 60 nm in diameter, the initial nominal concentration did not accurately represent the concentration of nanoparticles local to the cells.Conclusion Nanoparticles dynamics in solution regulate the amount of material at the cellular level and must be taken into account when evaluating the biological response of organisms. the theoretical model proposed in this study accurately described the settling dynamics of the nanoparticles and thus represents a promising tool to support the design of in vitro experiments and the study of concentration-response relationships.

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Section: Effect Of Size On Nanoparticle Sedimentation-diffusion Equilsupporting

confidence: 52%

Sedimentation-Diffusion Behaviour of Nanoparticles

Giorgi¹,

Macko²,

Curran³

et al. 2020

Preprint

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“…During the curing process, only the anisotropic reinforced samples were exposed to a magnetic flux density of 7 mT. It is important to mention that after 20 min of the curing process, the mixture practically reached a semi-solid state, which hindered magnetic particle sedimentation [33].…”

Section: Resultsmentioning

confidence: 99%

Fabrication and Characterization of Isotropic and Anisotropic Magnetorheological Elastomers, Based on Silicone Rubber and Carbonyl Iron Microparticles

et al. 2018

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This article focuses on studying the rheological behavior of isotropic and anisotropic magnetorheological elastomers (MREs), made of carbonyl iron microparticles dispersed into a silicone–rubber matrix by considering 20 and 30 wt % of microparticles. Sample sets were prepared for each composition, with and without the application of an external magnetic field. Experimental measurements of the material rheology behavior were carried out by a shear oscillatory rheometer at constant temperature, to determine both the shear storage modulus (G′) and shear loss modulus (G′′) for all characterized samples. Then, experimental data collected from the isotropic and the anisotropic material samples were used to plot the Cole-Cole diagrams to quantify the interfacial adhesion between carbonyl iron microparticles and the silicone-rubber matrix. Furthermore, the Fractional Zener Model (FZM) with two spring-pots in series is used for quantitative analysis of collected experimental data.

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“…In reality, interactions between the magnets would certainly be present and would alter the magnetic forces experienced by MNPs. Additionally, it is well established that increasing particle concentrations lead to a decrease in inter-particle distance and an increase in particle–particle interactions [ 33 ]. In this study, the concentration of MNP suspension injected into the mobile phase was significantly concentrated to ensure final concentrations obtained were appropriate for DLS analysis.…”

Section: Resultsmentioning

confidence: 99%

Exploiting Size-Dependent Drag and Magnetic Forces for Size-Specific Separation of Magnetic Nanoparticles

Rogers

Anani

Choi

et al. 2015

IJMS

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Realizing the full potential of magnetic nanoparticles (MNPs) in nanomedicine requires the optimization of their physical and chemical properties. Elucidation of the effects of these properties on clinical diagnostic or therapeutic properties, however, requires the synthesis or purification of homogenous samples, which has proved to be difficult. While initial simulations indicated that size-selective separation could be achieved by flowing magnetic nanoparticles through a magnetic field, subsequent in vitro experiments were unable to reproduce the predicted results. Magnetic field-flow fractionation, however, was found to be an effective method for the separation of polydisperse suspensions of iron oxide nanoparticles with diameters greater than 20 nm. While similar methods have been used to separate magnetic nanoparticles before, no previous work has been done with magnetic nanoparticles between 20 and 200 nm. Both transmission electron microscopy (TEM) and dynamic light scattering (DLS) analysis were used to confirm the size of the MNPs. Further development of this work could lead to MNPs with the narrow size distributions necessary for their in vitro and in vivo optimization.

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Particle sedimentation: effect of polymer concentration on particle–particle interaction

Cited by 37 publications

References 18 publications

Sedimentation-Diffusion Behaviour of Nanoparticles

Sedimentation-Diffusion Behaviour of Nanoparticles

Fabrication and Characterization of Isotropic and Anisotropic Magnetorheological Elastomers, Based on Silicone Rubber and Carbonyl Iron Microparticles

Exploiting Size-Dependent Drag and Magnetic Forces for Size-Specific Separation of Magnetic Nanoparticles

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