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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"ferrofluids"”.
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Investigation Of Temperature Dependent Magnetic Hyperthermia In Fe3o4 Ferrofluids
… hyperthermia (MHT), the production of heat using ferrofluids, colloidal suspensions of MNPs, in an external AC magnetic field (amplitude, 100-500 Oe and frequency 50 kHz -1MHz), has been explored by many researchers, both in vitro and in vivo, as an alternative viable option to treat cancer. The …
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Development of innovative transducers based on Magnetic Fluids
… concept here is the use of new materials, called ferrofluids or magnetic fluids, made by a suspension of magnetic nanoparticles in a carrier fluid; several different devices have been developed and are shown here in order to demonstrate the possibility to use ferrofluids as a core material to …
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Design and manufacture of a modular cylindrical apparatus for ferrofluid experimentation
Ferrofluids, colloidal suspensions of coated magnetic nanoparticles inside a carrier fluid, respond to externally applied magnetic fields. This thesis addresses the behavior of these fluids when subjected to an azimuthally rotating uniform magnetic field. In order to test the theory that fluid flow …
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Characterizing ferrofluid spin-up flow in rotating uniform magnetic fields
… to form a colloid. The dynamic behavior of ferrofluids in the presence of magnetic fields has long been an area of research interest. A particular area of interest deals with the "spin-up" mechanisms of ferrofluids, which describe how a container of ferrofluid comes to a steady state of bulk …
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The Hydrodynamics of Ferrofluid Aggregates
Ferrofluids are comprised of subdomain particles of magnetite or iron oxide material that can become magnetized in the presence of a magnetic field. These unique liquids are being incorporated into many new applications due to the ability to control them at a distance using magnetic fields. …
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Using a ferro-fluid pad to climb walls
… system that utilizes the viscosity property of ferrofluids. Ferrofluid viscosity is varies based on the magnetic field applied to it and this property enables ferrofluids to be used as an adhesive. This would allow a human, with a specially designed climbing gripper, to climb up walls by varying …
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Ferrohydrodynamic flows in uniform and non-uniform rotating magnetic fields
Ferrofluids are conventionally used in such DC magnetic field applications as rotary and exclusion seals, stepper motor dampers, and heat transfer fluids. Recent research demonstrates ferrofluid use in alternating and rotating magnetic fields for MEMS/NEMS application of microfluidic devices and …
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Continuum modeling of polarizable systems
… are then applied to the particular case of ferrofluids, thereby obtaining the governing equations for isothermal incompressible ferrofluid flows. The governing equations thus obtained are subsequently used to extend previous models of plane-Poiseuille and Couette flow of ferrofluids in …
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On the dynamics of magnetic fluids in magnetic resonance imaging
… hydrodynamics of magnetic fluids, often termed ferrofluids, has been an active area of research since the mid 1960s. However, it is only in the past twenty years that these fluids have begun to be used in magnetic resonance imaging (MRI) where they have found application as contrast agents, …
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Magnetic Nanoparticles Based on Iron: Synthesis, Characterization, Design, and Application
… of nanoparticles for aqueous dispersions and ferrofluids has varying degrees of importance, depending on the application. In applications such as magnetic resonance imaging (MRI) where the targets are biological systems, it was important to produce solutions that will not aggregate in the high …
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Ferrofluid dynamics in a Hele-Shaw cell simultaneously stressed by DC and rotating magnetic fields
… to the ferrohydrodynamic applications of ferrofluids in biomedicine. Careful measurements in Hele-Shaw cells with simultaneous perpendicular DC and in-plane rotating magnetic fields have shown that ferrofluid drop spiral patterns rotate in the same direction as the rotating magnetic field, …
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Ferrofluid surface and volume flows in uniform rotating magnetic fields
… To characterize the water-based and oil-based ferrofluids used in experiments, measurements were made of the magnetization curve, surface tension, viscosity, density, and the speed of sound. Extensive measurements of the height and shape of ferrofluid menisci in applied uniform dc magnetic …
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Synthèse de nanoparticules de carbure de fer dans un réacteur à plasma inductif
… particles in research and industry, such as in ferrofluids, magnetic recording and biosensors. We are focused in this project on its application as catalyst for Fischer-Tropsch reaction. Two different injection methods were used in this study. Suspension injection was used because of its …
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Active lubricant-impregnated surfaces
… surfaces by impregnating active fluids such as ferrofluids into a textured surface. Droplets on such ferrofluid-impregnated surfaces have extremely low hysteresis and high mobility such that they can be propelled by applying relatively low magnetic fields. Our surface is able to manipulate a …
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Surface Deformations of Magnetic Continua in Homogeneous Fields
… with magnetic liquids and gels are presented. Ferrofluids are synthetically created suspensions of magnetic nanoparticles in a carrier liquid. By adding a gelator, such a ferrofluid can be turned into a ferrogel. The magnetic properties of these substances are similar to a usual paramagnet with …
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Multi-channel tag based on fluid-suspended magnetic microparticles
… carrying data in a liquid of magnetic particles. Ferrofluids to date are mostly simple iron oxide particles suspended in liquid, whereas this project uses micron lithography on thin film films of magnetic material which can be lifted off into solution to create an artificial ferrofluid of advanced …
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Physical Properties of Macromolecule-metal oxide nanoparticle complexes: Magnetophoretic Mobility, Size, and Interparticle Potentials
… predicting fluid stability. The macromolecular ferrofluids investigated herein are comprised of magnetite nanoparticles coated with tricarboxylate-functional polydimethylsiloxane (PDMS) oligomers. The nanoparticles were formed by reacting stoichiometric concentrations of iron chloride salts with …
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Template-Controlled Synthesis of Magnetic/Semiconducting Nanoparticles within Amphiphilic Core-Shell Cylindrical Polymer Brushes
… and may find potential applications such as in ferrofluids. Similarly, using the amphiphilic core-shell cylindrical polymer brush with PAA core and PnBA shell as template, wire-like assemblies of CdS nanoparticles were successfully synthesized under mild solution conditions, as confirmed by …
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Transport und Strukturbildung in magnetischen Hybriden
… sich die effektive Ober- flächenspannung des Ferrofluids erhöhen. Das hat eine Vergrößerung der Wellenlänge des Musters λc sowie eine Erhöhung der zur Erzeu- gung nötigen kritischen Flussdichte Bc zur Folge. Überraschend ist das Anwachsen der Amplitude des Musters bei Überschichtung. Dieser …
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Magnetic field directed self-assembly of gold Pickering emulsion for preparing patterned film.
Patterning plays a vital in role in sensor-based devices like surface-enhanced Raman spectroscopy (SERS), surface-enhanced infrared absorption (SEIRA), radio frequency (RF) antennas and many others. The linear array spacing and width of gold strips has been shown to increase the local intensity …
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