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Magnetic Nanoparticle Assemblies
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Book Synopsis Magnetic Nanoparticle Assemblies by : Kalliopi N. Trohidou
Download or read book Magnetic Nanoparticle Assemblies written by Kalliopi N. Trohidou and published by CRC Press. This book was released on 2014-09-19 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic nanoparticles with diameters in the range of a few nanometers are today at the cutting edge of modern technology and innovation because of their use in numerous applications ranging from engineering to biomedicine. A great deal of scientific interest has been focused on the functionalization of magnetic nanoparticle assemblies. The understanding of interparticle interactions is necessary to clarify the physics of these assemblies and their use in the development of high-performance magnetic materials. This book reviews prominent research studies on the static and dynamic magnetic properties of nanoparticle assemblies, gathering together experimental and computational techniques in an effort to reveal their optimized magnetic properties for biomedical use and as ultra-high magnetic recording media.
Book Synopsis Magnetic Nanoparticle Assemblies by : Kalliopi N. Trohidou
Download or read book Magnetic Nanoparticle Assemblies written by Kalliopi N. Trohidou and published by CRC Press. This book was released on 2014-09-19 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic nanoparticles with diameters in the range of a few nanometers are today at the cutting edge of modern technology and innovation because of their use in numerous applications ranging from engineering to biomedicine. A great deal of scientific interest has been focused on the functionalization of magnetic nanoparticle assemblies. The underst
Book Synopsis The preparation of magnetic nanoparticle assemblies for biomedical applications by : Swapankumar Ghosh
Download or read book The preparation of magnetic nanoparticle assemblies for biomedical applications written by Swapankumar Ghosh and published by . This book was released on 2006 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis X-ray Studies of Magnetic Nanoparticle Assemblies by :
Download or read book X-ray Studies of Magnetic Nanoparticle Assemblies written by and published by . This book was released on 2003 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Monodisperse FePt nanoparticles were prepared using high temperature solution phase synthesis. Polymer-mediated layer-by-layer growth leads to precise control of the particle self-assembly. The narrow particle size distribution ([sigma] ≤ 5%) offers the potential for increased data storage density by utilizing a smaller mean particle size and ultimately storage of one bit per individual nanoparticle. We have studied self-assembled multilayers of magnetic FePt nanoparticles. The L10 phase of FePt has a very high magnetic anisotropy which allows the magnetization of particles of about 4 nm diameter to be thermally stable at room temperature. Magnetic measurements using vibrating sample magnetometer were combined with X-ray diffraction (XRD) and Near Edge X-ray Absorption Fine Structure (NEXAFS) Spectroscopy to study the annealed FePt nanoparticle assemblies and to optimize annealing conditions. NEXAFS spectra showed that a fraction of the iron in the as-deposited particles was oxidized, and this fraction was reduced by annealing in inert or reducing atmospheres. A very thin layer (
Book Synopsis Magnetic Structures of 2D and 3D Nanoparticles by : Jean-Claude Serge Levy
Download or read book Magnetic Structures of 2D and 3D Nanoparticles written by Jean-Claude Serge Levy and published by CRC Press. This book was released on 2018-09-03 with total page 411 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic nanoparticles appear naturally in rock magnetism together with a large distribution of sizes and shapes. They have numerous applications from nano-size magnetic memories to metamaterials for electromagnetic waves as well as biological applications such as nanosurgery with minimal traumatism. Their long-ranged size- and shape-dependent dipolar interactions provide numerous useful properties. This book describes the preparation as well as the magnetic properties of nanoparticles and also considers 2D dots, nearly spherical samples, elongated samples, and various assemblies of nanoparticles. The authors report the static magnetic structures and dynamic properties of these nanoparticles and the topological defects in 2D and 3D nanoparticles with new examples of S-shaped vortex or antivortex and of bent vortex or antivortex in 3D nanoparticles. The spectrum of magnetic excitations is shown to exhibit the occurrence of gaps, a key for magnonic metamaterial devices. Magnetic excited states are also considered with their coupling to nanoparticle elastic properties.
Book Synopsis Stable Colloids of Magnetic Nanoparticles and Nanoparticle Assemblies with Controlled Size and Magnetic Resonance Properties by : Eoin Fox
Download or read book Stable Colloids of Magnetic Nanoparticles and Nanoparticle Assemblies with Controlled Size and Magnetic Resonance Properties written by Eoin Fox and published by . This book was released on 2014 with total page 215 pages. Available in PDF, EPUB and Kindle. Book excerpt: Suspensions of both dispersed and clustered iron oxide nanoparticles are of interest for biomedical applications as diagnostic and therapeutic agents due to their bio-compatibility and interesting magnetic and magnetic resonance properties. Their application is critically dependent on the fact that these properties are highly size-dependant. By developing NP synthesis and assembly methods, to provide improved size control at the two levels of organisation, NP suspensions with controlled emergent magnetic properties have been prepared. The first part of this thesis presents the size-controlled synthesis of magnetic nanoparticles whose surface is functionalised with a wide range of stabilising ligands. An investigation was undertaken to elucidate the effect of the stabilising ligands on the physical properties. The second part of the thesis presents a novel method for the reproducible assembly, in suspension, of NPs to form clusters. The method can be used to produce clusters of controlled size in large quantities; it is also shown that the kinetics of assembly can be easily controlled and that this influences the emergent magnetic properties. Arising from this observation a study was undertaken to determine the role of cluster architecture on the magnetic resonance properties of their aqueous suspensions.
Book Synopsis Plasma Synthesis and Self-Assembly of Magnetic Nanoparticles by : Sebastian Ekeroth
Download or read book Plasma Synthesis and Self-Assembly of Magnetic Nanoparticles written by Sebastian Ekeroth and published by Linköping University Electronic Press. This book was released on 2019-11-08 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanomaterials are important tools for enabling technological progress as they can provide dramatically different properties as compared to the bulk counterparts. The field of nanoparticles is one of the most investigated within nanomaterials, thanks to the existing, relatively simple, means of manufacturing. In this thesis, high-power pulsed hollow cathode sputtering is used to nucleate and grow magnetic nanoparticles in a plasma. This sputtering technique provides a high degree of ionization of the sputtered material, which has previously been shown to aid in the growth of the nanoparticles. The magnetic properties of the particles are utilized and makes it possible for the grown particles to act as building blocks for self-assembly into more sophisticated nano structures, particularly when an external magnetic field is applied. These structures created are termed “nanowires” or “nanotrusses”, depending on the level of branching and inter-linking that occurs. Several different elements have been investigated in this thesis. In a novel approach, it is shown how nanoparticles with more advanced structures, and containing material from two hollow cathodes, can be fabricated using high-power pulses. The dual-element particles are achieved by using two distinct and individual elemental cathodes, and a pulse process that allows tuning of individual pulses separately to them. Nanoparticles grown and investigated are Fe, Ni, Pt, Fe-Ni and Ni-Pt. Alternatively, the addition of oxygen to the process allows the formation of oxide or hybrid metal oxide – metal particles. For all nanoparticles containing several elements, it is demonstrated that the stoichiometry can be easily varied, either by the amount of reactive gas let into the process or by tuning the amount of sputtered material through adjusting the electric power supplied to the different cathodes. One aim of the presented work is to find a suitable material for the use as a catalyst in the production of H2 gas through the process of water splitting. H2 is a good candidate to replace fossil fuels as an energy carrier. However, rare elements (such as Ir or Pt) needs to be used as the catalyst, otherwise a high overpotential is required for the splitting to occur, leading to a low efficiency. This work demonstrates a possible route to avoid this, by using nanomaterials to increase the surface-to-volume ratio, as well as optimizing the elemental ratio between different materials to lower the amount of noble elements required.
Book Synopsis SEEDLING Proposal to Establish Pilot Data for a Consortium on Magnetic Nanoparticle Assemblies: A New Tool for Drug Delivery, Sensors and Electronic Devices by :
Download or read book SEEDLING Proposal to Establish Pilot Data for a Consortium on Magnetic Nanoparticle Assemblies: A New Tool for Drug Delivery, Sensors and Electronic Devices written by and published by . This book was released on 2003 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Complexes of magnetic nanoparticles with polymer dispersion stabilizers can lead to well-defined magnetic dispersions and also to precursors for magnetic microspheres. Thus, complexes of block copolymers containing both hydrophilic and hydrophobic dispersion components with magnetite nanoparticles have been prepared and characterized. In-vitro cell survival assays of the hydrophilic complexes suggest a relationship between cell survival and proliferation and the molecular weight (and hydrophilicity) of the polymer dispersants (higher molecular weight results in better cell proliferation/survival). Magnetic transition metals such as cobalt, iron or nickel are susceptible to oxidation with concurrent loss in magnetic response unless the nanoparticle surfaces are protected with oxygen impermeable coatings. Copolymer precursors to graphitic-like and silica-like protective coatings have been prepared and utilized to coat cobalt nanoparticles in thermolysis reactions. High temperature pyrolyses of the complexes in both cases suggest that oxidatively stable cobalt nanoparticles approximately 10 nm in diameter can be formed. The pyrolysis procedure results in 10-nm cobalt but the particles are adhered together. Attention will be devoted during the forthcoming year on methods for separating the nanoparticles from each other and on 're-coating' the materials with appropriate biospecific functional groups.
Book Synopsis Complex Magnetic Nanostructures by : Surender Kumar Sharma
Download or read book Complex Magnetic Nanostructures written by Surender Kumar Sharma and published by Springer. This book was released on 2017-04-04 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a detailed discussion of the complex magnetic behavior of magnetic nanosystems, with its myriad of geometries (e.g. core-shell, heterodimer and dumbbell) and its different applications. It provides a broad overview of the numerous current studies concerned with magnetic nanoparticles, presenting key examples and an in-depth examination of the cutting-edge developments in this field. This contributed volume shares the latest developments in nanomagnetism with a wide audience: from upper undergraduate and graduate students to advanced specialists in both academia and industry. The first three chapters serve as a primer to the more advanced content found later in the book, making it an ideal introductory text for researchers starting in this field. It provides a forum for the critical evaluation of many aspects of complex nanomagnetism that are at the forefront of nanoscience today. It also presents highlights from the extensive literature on the topic, including the latest research in this field.
Book Synopsis Magnetic order in two-dimensional nanoparticle assemblies by : M. Georgescu
Download or read book Magnetic order in two-dimensional nanoparticle assemblies written by M. Georgescu and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nanoparticle Assemblies and Superstructures by : Nicholas A. Kotov
Download or read book Nanoparticle Assemblies and Superstructures written by Nicholas A. Kotov and published by CRC Press. This book was released on 2016-04-19 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cubes, triangular prisms, nano-acorn, nano-centipedes, nanoshells, nano-whiskers. . . . Now that we can create nanoparticles in a wide variety of shapes and morphologies, comes the next challenge: finding ways to organize this collection of particles into larger and more complex systems. Nanoparticle Assemblies and Superstructures, edit
Book Synopsis Nanoparticle Assemblies by : Royal Society of Chemistry (Great Britain)
Download or read book Nanoparticle Assemblies written by Royal Society of Chemistry (Great Britain) and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The volume covers the fundamental aspects of the relationship between nanoparticle functionality, size and properties, and how these determine their self-organisation in 2- and 3-D structures. Work is presented in the following areas: the fundamental principles of self-organisation at the nanoscale; the dependence of electronic and optical properties of assemblies on spacing, functionality and chemical nature of the constituent nanoparticles; magnetic nanoparticles; electronic properties of nanoparticles and superlattices; electron transfers, single electron events and quantum size effects. Faraday Discussions documents a long-established series of Faraday Discussion meetings which provide a unique international forum for the exchange of views and newly acquired results in developing areas of physical chemistry, biophysical chemistry and chemical physics. The papers presented are published in the Faraday Discussion volume together with a record of the discussion contributions made at the meeting. Faraday Discussions therefore provide an important record of current international knowledge and views in the field concerned.
Book Synopsis Size and Shape-controlled Magnetic Nanoparticles and the Assembly of Magnetic Nanoparticle Arrays by : Gyu Leem
Download or read book Size and Shape-controlled Magnetic Nanoparticles and the Assembly of Magnetic Nanoparticle Arrays written by Gyu Leem and published by . This book was released on 2008 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spin and Orbital Moments and Magnetic Order in Fe3O4 Nanoparticle Assemblies by : Yanping Cai
Download or read book Spin and Orbital Moments and Magnetic Order in Fe3O4 Nanoparticle Assemblies written by Yanping Cai and published by . This book was released on 2014 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fe3O4 magnetic nanoparticles of 5 to 11 nm in size were prepared by organic methods. Particle size was analyzed by both X-ray Diffraction (XRD) and Transmission Electron Microscopy (TEM) techniques. Zero Field Cooling (ZFC) / Field Cooling (FC) and magnetization loop measurements were recorded by VSM, and they confirmed superparamagnetic behavior in the sample. The blocking temperature is found to be in the range of 30 K ~ 170 K. It has a dependence on the particle size. ZFC / FC curves also indicate the presence of magnetic coupling between particles. X-ray Magnetic Circular Dichroism (XMCD) measurements of these nanoparticles were measured at 80 K and 300 K. By using the sum rules, spin and orbital magnetic moments were calculated from the XMCD signal. The results confirm a quenching orbital moment and a large spin moment. The calculated total magnetic moments are somewhat smaller than in bulk Fe3O4. Also, the spin moment at 80 K was found to be larger than at 300 K. X-ray Resonant Magnetic Scattering (XRMS) measurements at different temperatures, polarizations and fields were carried out. The intensity profile gives information on the interparticle distance between nanoparticles which is consistent with TEM results. A magnetic signal was extracted by calculating the dichoroic term, when the energy is tuned to resonant edges. This magnetic signal is confirmed by comparing the dichroic terms at different conditions.
Book Synopsis Magnetic Nanoparticles in Human Health and Medicine by : Costica Caizer
Download or read book Magnetic Nanoparticles in Human Health and Medicine written by Costica Caizer and published by John Wiley & Sons. This book was released on 2021-09-08 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic Nanoparticles in Human Health and Medicine Explores the application of magnetic nanoparticles in drug delivery, magnetic resonance imaging, and alternative cancer therapy Magnetic Nanoparticles in Human Health and Medicine addresses recent progress in improving diagnosis by magnetic resonance imaging (MRI) and using non-invasive and non-toxic magnetic nanoparticles for targeted drug delivery and magnetic hyperthermia. Focusing on cancer diagnosis and alternative therapy, the book covers both fundamental principles and advanced theoretical and experimental research on the magnetic properties, biocompatibilization, biofunctionalization, and application of magnetic nanoparticles in nanobiotechnology and nanomedicine. Chapters written by a panel of international specialists in the field of magnetic nanoparticles and their applications in biomedicine cover magnetic hyperthermia (MHT), MRI contrast agents, biomedical imaging, modeling and simulation, nanobiotechnology, toxicity issues, and more. Readers are provided with accurate information on the use of magnetic nanoparticles in diagnosis, drug delivery, and alternative cancer therapeutics—featuring discussion of current problems, proposed solutions, and future research directions. Topics include current applications of magnetic iron oxide nanoparticles in nanomedicine and alternative cancer therapy: drug delivery, magnetic resonance imaging, superparamagnetic hyperthermia as alternative cancer therapy, magnetic hyperthermia in clinical trials, and simulating the physics of magnetic particle heating for cancer therapy. This comprehensive volume: Covers both general research on magnetic nanoparticles in medicine and specific applications in cancer therapeutics Discusses the use of magnetic nanoparticles in alternative cancer therapy by magnetic and superparamagnetic hyperthermia Explores targeted medication delivery using magnetic nanoparticles as a future replacement of conventional techniques Reviews the use of MRI with magnetic nanoparticles to increase the diagnostic accuracy of medical imaging Magnetic Nanoparticles in Human Health and Medicine is a valuable resource for researchers in the fields of nanomagnetism, magnetic nanoparticles, nanobiomaterials, nanobioengineering, biopharmaceuticals nanobiotechnologies, nanomedicine, and biopharmaceuticals, particularly those focused on alternative cancer diagnosis and therapeutics.
Book Synopsis Magnetic Nanoparticles in Biosensing and Medicine by : Nicholas J. Darton
Download or read book Magnetic Nanoparticles in Biosensing and Medicine written by Nicholas J. Darton and published by Cambridge University Press. This book was released on 2019-02-14 with total page 317 pages. Available in PDF, EPUB and Kindle. Book excerpt: Drawing together topics from a wide range of disciplines, and featuring up-to-date examples of clinical usage and research applications, this text provides a comprehensive insight into the fundamentals of magnetic biosensors and the applications of magnetic nanoparticles in medicine.
Book Synopsis SEEDling Grant to Establish Pilot Data for a Consortium on Magnetic Nanoparticle Assemblies: A New Tool for Drug Delivery, Sensors and Electronic Devices by :
Download or read book SEEDling Grant to Establish Pilot Data for a Consortium on Magnetic Nanoparticle Assemblies: A New Tool for Drug Delivery, Sensors and Electronic Devices written by and published by . This book was released on 2003 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: This project has entailed the development of magnetic materials with potential suitability as vehicles for magnetic field-directed drug delivery, and the design and implementation of a laboratory-scale instrument for measuring the magnetophoretic behavior of new materials in flowing media. Triblock copolymers comprised of hydrophilic poly(ethylene oxide) tail blocks and a polyurethane anchor block containing carboxylic acid binding groups were designed and synthesized. A method for preparing stabilized dispersions of magnetite nanoparticles coated with the stabilizers was developed, and these coated nanoparticles could be dispersed in water. Dispersions of the particle-copolymer complexes remained stable (did not separate) when these materials were dialyzed rigorously and subjected to repeated centrifugation steps to eliminate potentially toxic extractables. An in-vitro assay of toxicity was developed to assess cell survival in the presence of the magnetite nanoparticle-copolymer complexes. A first generation magnet system was designed in collaboration with our colleagues at Stereotaxis (St. Louis, MO). This research scale magnetic guidance system is now in place at VA Tech.
