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  • Agglomerate formation in moderately concentrated

    Jan 01, 1999· Agglomerate formation in moderately concentrated ferrofluids from static magneto-optical measurements due to the anisotropy of the particles or aggregates which rotate in the solvent in the presence of the field and the formation theory, which assumes that due to the orientation of particles they agglomerate into linear chains parallel to

  • Agglomerate formation in moderately concentrated

    Jan 01, 1999· In this paper the stability of ferrofluids based on several organic solvents with magnetite particles having different stabilization layers from static linear dichroism and birefringence has been studied. Based on the theory of formation it has been found that the mean number of particles per chain for most samples is very low; the mean ellipticity of chains computed from the formation theory

  • Particle size distribution in ferrofluid macro-clusters

    Mar 01, 2013· Abstract. Under an applied magnetic field, many commercial and concentrated ferrofluids agglomerate and form large micron-sized structures. Although large diameter particles have been implicated in the formation of these macro-clusters, the question of whether the particle size distribution of the macro-clusters are the same as the original fluid remains open.

  • High concentration aqueous magnetic fluids: structure

    Dec 08, 2017· High saturation magnetization ferrofluids should have the magnetic particle volume fraction as large as possible and, at the same time, avoid aggregate formation. These requirements are hard to satisfy, especially in the case of water based magnetic fluids. Long-term colloidal stability of concentrated

  • Particle size distribution in ferrofluid macro-clusters

    Under an applied magnetic field, many commercial and concentrated ferrofluids agglomerate and form large micron-sized structures. Although large diameter particles have been implicated in the

  • FERROFLUIDS Magnetism

    3 scale of 1-100 nm and it will be presented in detail, beside results of TEM, DLS and magnetogranulometric analyses. 3.2. Magnetic properties Magnetization curves can be extensively used for the study of both particle interactions and agglomerate formation, processes which

  • A comparison of the magnetorheology of two ferrofluids

    The effect of magnetic field-induced particle chaining on the magnetorheology of commercial iron oxide-based ferrofluids was investigated by comparison of a ferrofluid with particles that resist chaining and a ferrofluid with particles that interact when a field is applied, forming chain-like aggregates. This difference between the two ferrofluids was confirmed by optical microscopy and

  • Superparamagnetic Magnetite Nanoparticle Superstructures

    Agglomerate Formation in Moderately Concentrated ferrofluids from Static Magneto-Optical Measurements Electro- Orientation in Particle Light Valves Ca ˘luga ˘ru, G.; Ba ˘descu, V. Measuring the

  • Journal of Magnetism and Magnetic Materials Vol 191

    Read the latest articles of Journal of Magnetism and Magnetic Materials at ScienceDirect, Elsevier’s leading platform of peer-reviewed scholarly literature

  • High concentration aqueous magnetic fluids: structure

    Dec 08, 2017· High saturation magnetization ferrofluids should have the magnetic particle volume fraction as large as possible and, at the same time, avoid aggregate formation. These requirements are hard to satisfy, especially in the case of water based magnetic fluids. Long-term colloidal stability of concentrated

  • Chain Formation and Phase Separation in Ferrofluids: The

    Experimentally, the formation of anisotropic structures in ferrofluids placed to a magnetic field was observed using small-angle neutron scattering [73,74,75,76,77,78]. Figure 4 shows the experimentally obtained [ 77 ] scattering patterns for a ferrofluid based on cobalt nanoparticles experiencing different magnetic field strengths and shear rates.

  • Synthesis of an Aqueous Ferrofluid

    Jul 26, 2007· The formation of ferrofluid involves various types of forces that hold the different components together. 1.6667 mL of concentrated (29%) Ammonium Hydroxide is required for each experiment. it adheres to the particles creating a net repulsion between them so the particles do not agglomerate. In the absence of a stabilizing agent the

  • AN EXPERIMENTAL AND THEORETICAL INVESTIGATION

    tion in concentrated ferrofluids like those used in devices. Previous observations of agglomeration were made in very dilute ferrofluids which are poorly suited for devices. In addition our observations were on fluids with measured intrinsic magnetic properties. This is in contrast

  • Study of the deformation of ferrofluid droplets in a

    Pincus [12] have predicted chain formation in dilute ferrofluids, but the observed agglomerates are much thicker than the predictions. More recently Liao and Krueger [13] developed a theory of the formation of agglomerates under magnetic fields. We report here on direct microscope measurements of the size and shape of large agglomerates

  • VERY HIGH CONCENTRATION AQUEOUS MAGNETIC

    non-uniform magnetic field.[2-5] High saturation magnetization ferrofluids should have the magnetic particle volume fraction as large as possible and, at the same time, avoid aggregate formation. These requirements are hard to satisfy, especially in case of water based magnetic fluids.

  • Thermodynamic properties of moderately concentrated

    Depletion and cluster formation in soft colloid polymer mixtures. Europhysics Letters (EPL) Small-angle neutron scattering of ionic ferrofluids. Journal of Magnetism and Magnetic Materials 1993, 122 (1-3) (α‐methylstyrene) in moderately concentrated

  • A comparison of the magnetorheology of two ferrofluids

    The effect of magnetic field-induced particle chaining on the magnetorheology of commercial iron oxide-based ferrofluids was investigated by comparison of a ferrofluid with particles that resist chaining and a ferrofluid with particles that interact when a field is applied, forming chain-like aggregates. This difference between the two ferrofluids was confirmed by optical microscopy and

  • Magnetoviscous effects in ferrofluids

    As soon as concentrated liquids are consid-ered, interaction of the particles has to be taken into account and formation and breakage of chains dominates the magnetoviscous behav-ior. To explain these effects in fluids with a major amount of magnetically weak particles, the influence of primary agglomerates has been studied.

  • (PDF) Microstructural investigation of some biocompatible

    Magnetization curves can be used for the study of two chemical species used to cover the ferrophase (uncoated both particle interactions and agglomerate formation, ferrophase being eliminated by centrifugal purification). processes that strongly influence the rheological behavior Also, larger diameter particles of the citrate-coated ferro- of

  • Suspension Concentrate Formulation Jeevan Chemicals

    Suspension Concentrate Development : may result in stable agglomerate formation. In the real world, most formulations will experience cyclic temperature conditions: cold winter, moderate spring and fall, and hot summers. In order to understand product physical limitations, it is necessary to evaluate the formulation performance under

  • Ferrofluid (English) ~ Science and Science Fiction

    Dec 19, 2013· Particles in ferrofluids are dispersed in a liquid, often using a surfactant, and thus ferrofluids are colloidal suspensions materials with properties of more than one state of matter. In this case, the two states of matter are the solid metal and liquid it is in.