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3.1.1 Observed agglomeration of magnetic particles in the feed vessel during magnetic separation If the magnetic particle-based separation technique is to be carried out in a technical scale production of mRNA-based vaccine, it is not possible by using the magnetic separators used in the laboratory scale.
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Particle agglomeration in magnetic field is produced via generated-magnetic-dipoles and magnetic gradient forces. Until this day, researches on magnetic-induced-agglomeration have always been carried out around particles owning magnetization properties which are mostly found in the flue gas from thermal power plants.
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The likelihood of magnetic nanoparticles to agglomerate is usually estimated through the ratio between magnetic dipole-dipole and thermal energies, thus neglecting the fact that, depending on the magnitude of the magnetic anisotropy constant (K), the particle moment may fluctuate internally and thus undermine the agglomeration process.
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Magnetic agglomeration plays a vital role in enhancing the separation of fine magnetic mineral particles. However, the forces causing magnetic agglomeration in wet low-intensity magnetic ...
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@article{osti_1021904, title = {Magnetic agglomeration method for size control in the synthesis of magnetic nanoparticles}, author = {Huber, Dale L}, abstractNote = {A method for controlling the size of chemically synthesized magnetic nanoparticles that employs magnetic interaction between particles to control particle size and does not …
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The optimization of the nanoparticles' size, size distribution, agglomeration, coating, and shapes along with their unique magnetic properties prompted the application of nanoparticles of this type in diverse fields. Biomedicine is one of these fields where intensive research is currently being conducted.
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We present a method for the synthesis and precise size control of magnetic nanoparticles in a reversible magnetic agglomeration mechanism. In this approach, nanoparticles nucleate and grow until a critical susceptibility is reached, in which magnetic attraction overcomes dispersive forces, leading to agglomeration and precipitation.
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The process of agglomeration in the production of dairy powders generally occurs in the spray dryer chamber, and/or, in the external fluid bed located after the spray drying chamber (Fig. 4) [70, 71].In the spray drying chamber, agglomeration occurs through the collisions of either wet particles (primary agglomeration) or wet and dry particles …
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agglomeration in the absence of an applied magnetic fi eld leads to an increase of the e ff ective size of nanoparticles (or rather primary agglomerates), and once the magnetic fi eld is applied,
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Magnetic agglomeration plays a vital role in enhancing the separation of fine magnetic mineral particles. However, the forces causing magnetic agglomeration in wet low-intensity magnetic ...
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SPM NPs have several advantages, such as preventing the agglomeration of NPs (caused by magnetic attraction) and a sensitive response to a remote-controlled magnetic field. In contrast, FM materials exhibit a certain magnetization value in the absence of an external magnetic field. Therefore, FM NPs always retain strong magnetic properties ...
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Balancing magnetic interactions and dispersive forces can establish thermodynamic control over nanoparticle growth. In their Communication on page 7678 …
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However, to date, modest orientation order has been achieved and uniformity and optical performance are compromised with agglomeration of magnetic nanoparticles and very high nanoparticle content ...
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Magnetic nanofluid, popularly known as ferrofluid, is a colloidal suspension of fine magnetic nanoparticles, has been at the forefront of research because of its magnetically tunable physicochemical properties and applications. ... or protein molecule that provides a short-range repulsion preventing particles from agglomeration [131]. …
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Conventional sintering is a time- and energy-consuming process used for the densification of consolidated particles facilitated by atomic diffusion at high temperatures. Nanoparticles, with their ...
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In this investigation, the magnetic spinel ferrite CoFe2O4 (CFO) nanoparticles (NPs) were prepared by chemical co-precipitation method followed by annealing at 200 °C, 400 °C, and 600 °C. After various characterizations, these CFO NPs were tested for their percentage of photocatalytic degradation of Methylene Blue () …
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The impact of agglomeration of magnetic nanoparticles on the Casimir pressure is investigated in the configuration of two material plates and a layer of ferrofluid confined between them. Both cases of similar and dissimilar plates are considered in the framework of the Lifshitz theory of dispersion forces. It is shown that for two dielectric …
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Magnetic agglomeration separation is a separation method where strongly magnetic minerals in small particles selectively form magnetic agglomerates under the magnetic force, gravitational force, and shear force in the low-frequency electromagnetic field, and then they can be separated from the gangue and mineral combination. ...
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The material prepared with 7.5 wt% kaolin demonstrated improved mechanical resistance, very low attrition rate and higher CuO utilization for the CLOU process after use in the BFBR, while maintaining reactivity during redox cycles and magnetic properties without agglomeration problems.
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In addition, agglomeration may also be caused by mRNA loading on the magnetic particles. Therefore, it is of interest how the individual steps of magnetic separation and subsequent redispersion in the buffers …
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This paper presents a modelling study about the nanoparticle agglomeration in magnetic nanofluids. The colloidal magnetic nanoparticles size distribution is subjected to simultaneous translation and rotation movements under the action of conservative and dissipative forces, with their respective moments. In order to obtain the numerical …
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A: Illustrative M vs. H hysteresis loops of two systems of particles of same size (d = 20 nm) and M S = 480 kA/m, but different K (10 and 20 kJ/m 3, respectively), at T = 0 K and for H max = 25 mT.
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Balancing magnetic interactions and dispersive forces can establish thermodynamic control over nanoparticle growth. In their Communication on page 7678 ff., D. L. Huber et al. show that when magnetic nanoparticles reach a critical size, magnetic interactions dominate, leading to agglomeration, which suppresses further growth. The …
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Magnetic beads are either incorporated by living cells by phagocytic processes or attached to integrin receptors to the cell membrane. The magnetic beads are ma … Effect of magnetic bead agglomeration on Cytomagnetometric measurements IEEE Trans Nanobioscience. 2003 Dec;2(4):247-54. doi: 10.1109/tnb.2003.820281. ...
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Magnetic agglomeration separation is a separation method where strongly magnetic minerals in small particles selectively form magnetic agglomerates under the …
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The reversible agglomeration mechanism suggests that increasing the alkyl chain length of the surfactant can delay magnetic agglomeration due to increased steric stabilization, …
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In contrast, when the agglomeration process was allowed to occur in the presence of an external magnetic field, these branches appeared to be oriented predominantly in one direction. A modified Discrete Element Method was applied to simulate the agglomeration process of magnetic nanoparticles both in the absence …
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We have presented an estimation of the threshold sizes for magnetic agglomeration of magnetite-like nanoparticles, depending on their magnetic anisotropy.
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In view of this consideration, the present article aims to provide reviews on the agglomeration, the colloidal stability, and the magnetic separation of MNPs. More …
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1.. IntroductionMagnetorheological (MR) fluids are composed of magnetic colloidal particles dispersed in nonmagnetic liquids. The magnetic particles respond to an applied magnetic field by forming aggregates corresponding to the field direction [1], [2].MR fluids have attracted the attention of both engineers and scientists for potential …
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Abstract. We present a method for the synthesis and precise size control of magnetic nanoparticles in a reversible magnetic agglomeration mechanism. In this approach, nanoparticles nucleate and grow until a critical susceptibility is reached, in which …
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Additionally, the smaller magnetic and non-magnetic NPs have high free surface energy that generally promotes the tendency of agglomeration . Different approaches may be used to avoid agglomeration in colloidal systems, including sonication of dispersion by ultrasonic bath [ 46 ] and particles covered by charged surfactants [ 47 ].
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Chain-like and diamond-shaped magnetic particle agglomeration (MPA) commonly forming in a weak magnetic field are simulated based on the finite element method (FEM), and the effects of particle diameter, magnetic field strength, particle relative magnetic permeability, and particle number in magnetic particle chains (MPCs) and diamond …
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The hard magnetic characteristics of the Nd-Fe-B films deteriorate and the c-axis alignment of anisotropic Nd 2 Fe 14 B hard magnetic grains tends to be deviated from the out-of-plane orientation when thickness of the films increases over a critical value. At the same time, a Nd agglomeration effect was found in the Nd-Fe-B layer volume, which is …
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magnetic agglomeration taken from an experiment using PD as surfactant. The reversible magnetic agglomeration mechanism is shown schematically in Figure 1a. It occurs when an iron precursor solution is continuously added to a solution of surfactant and 1 - octadecene (1 -ODE) at high temperature under an inert at mosphere.
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