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Characterization of the Grain Size in Ferromagnetic Colloids: Comparing Torsional-Pendulum Measurements with Standard Complementary Methods
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J. Embs
Veröffentlicht/Copyright:
25. September 2009
Summary
A recently introduced shear-flow-free method for measuring the rotational viscosity of a resonantly forced torsional pendulum is used to determine the transverse magnetic relaxation time in magnetite and cobalt-based ferrofluids. From these data the average size of the ferromagnetic grains and their hydrodynamic diameter (core plus surfactant coating) are deduced under in-situ conditions, i.e. without diluting the sample. The reliability of the method is demonstrated by comparing the results with those of the complementary techniques of magneto-granulometry, X-ray diffraction, electron microscopy, and photon-correlation spectroscopy.
Received: 2005-9-27
Accepted: 2005-11-16
Published Online: 2009-9-25
Published in Print: 2006-2-1
© by Oldenbourg Wissenschaftsverlag, München
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- Characterization of the Grain Size in Ferromagnetic Colloids: Comparing Torsional-Pendulum Measurements with Standard Complementary Methods
- Structural and Magnetic Properties of Ni/NiOxide- and Co/CoOxide Core/Shell Nanoparticles and their possible Use for Ferrofluids
- Nanoscaled Nickel-Zinc-Iron Oxides of Spinell Type as Soft Magnetic Colloids and their Ferromagnetic Resonance Spectrum
- Gravity Level Influence on a Laterally Heated Ferrofluid Submitted to an Oblique Strong Magnetic Field
- Determination of the Thermo and Magneto Phoresis by the Dissipative Function
- Magnetization of Rotating Ferrofluids: Predictions of Different Theoretical Models
- Thermal Ratchet Effect in a Rotating Ferrofluid
- Distribution of Mitoxantrone after Magnetic Drug Targeting: Fluorescence Microscopic Investigations on VX2 Squamous Cell Carcinoma Cells
- Some Immobilization Modes of Biologically Active Substances to Fine Magnetic Particles
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Artikel in diesem Heft
- Magnetic Nanoparticles for Biomedical Heating Applications
- Characterization of the Grain Size in Ferromagnetic Colloids: Comparing Torsional-Pendulum Measurements with Standard Complementary Methods
- Structural and Magnetic Properties of Ni/NiOxide- and Co/CoOxide Core/Shell Nanoparticles and their possible Use for Ferrofluids
- Nanoscaled Nickel-Zinc-Iron Oxides of Spinell Type as Soft Magnetic Colloids and their Ferromagnetic Resonance Spectrum
- Gravity Level Influence on a Laterally Heated Ferrofluid Submitted to an Oblique Strong Magnetic Field
- Determination of the Thermo and Magneto Phoresis by the Dissipative Function
- Magnetization of Rotating Ferrofluids: Predictions of Different Theoretical Models
- Thermal Ratchet Effect in a Rotating Ferrofluid
- Distribution of Mitoxantrone after Magnetic Drug Targeting: Fluorescence Microscopic Investigations on VX2 Squamous Cell Carcinoma Cells
- Some Immobilization Modes of Biologically Active Substances to Fine Magnetic Particles
- On Magnetic Field Control Experiments of Ferrofluid Convection Motion
