Synthesis And Characterization Of Magnetically Switchable Cobalt Containing Nanoparticles PDF Download
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Author | : Sasha Lenore Gill-Ljunghammer |
Publisher | : |
Total Pages | : 0 |
Release | : 2022 |
Genre | : |
ISBN | : |
Download Synthesis and Characterization of Magnetically-switchable Cobalt-containing Nanoparticles Book in PDF, ePub and Kindle
As electronic devices become more integrated in everyday life, there is an increasing necessity for miniaturization with exceptional efficiency. The use of tunable magnetic materials for information storage and transfer can meet this demand with many significant advantages over current technologies. The implementation of this science is contingent on optimizing the voltage control of magnetism (VCM), which has additional applications in healthcare and sensing. This work seeks to improve VCM in multiferroic composites and magnetoioics. In chapter 3 of this thesis, we report a straightforward and scalable synthesis of superparamagnetic cobalt ferrite nanoparticles that allows for precise size selection. The particles produced via this route also have remarkable size and shape uniformity, making them ideal for use in a strain-mediated multiferroic composite. In chapter 4 we advance fundamental understanding toward achieving unprecedented magnetic control in nanostructured Sm-Co magnets via electrochemical hydrogen charging. The structural and magnetic properties of SmCo5 and Sm2Co17, as well as the kinetics and thermodynamics involved in their hydrogenation, are documented for future work. Oxidation in air and in electrolyte is identified as a key challenge.
Author | : Jonathan Cowen |
Publisher | : |
Total Pages | : |
Release | : 2016 |
Genre | : |
ISBN | : |
Download Synthesis and Characterization of Cobalt-containing Nanoparticles on Alumina :. Book in PDF, ePub and Kindle
Author | : Mehdi Zamanpour |
Publisher | : |
Total Pages | : 134 |
Release | : 2014 |
Genre | : Energy storage |
ISBN | : |
Download Cobalt-based Magnetic Nanoparticles Book in PDF, ePub and Kindle
The ever-increasing desire for more energy attainable from a smaller volume of matter has driven researchers to explore advanced materials at the molecular size. Magnetic materials at the nanometer size scale have been the subject of enormous research effort worldwide for more than half a century. Different magnetic nanoparticles have shown different behavior in the absence and presence of an external magnetic field, which has led them to be categorized as soft or hard magnets. Applications range from medical and biomedical devices to magnetic recording media and magnetic sensing have emphasized the importance of this class of materials. Soft magnetic phases have found application in power generation and magnetic targeted drug delivery, while hard magnets have been subject of extensive research for application as energy storage media. Discovery of the exchange-coupling phenomenon between two adjacent hard and soft magnetic phases has attracted scientists to develop advanced materials for energy storage with no usage of fossil fuels: clean energy. In this Dissertation, synthesis of pure phase, soft FeCo nanoparticles with high magnetic moment and hard phase CoxC nanoparticles possessing high coercivity is reported. The polyol method (chemical co-precipitating at polyhydric alcohol as reducing agent) is used to make FeCo and CoxC nanoparticles and the effects of important reaction kinetics parameters on the structure and magnetic properties of the products are studied. Careful analysis of correlations between these parameters and the properties of the magnetic particles has made synthesis of FeCo and CoxC nanoparticles with desired properties possible. Fabrication of MnAlC-FeCo heterostructures as a rare earth-free alternative for high-performance permanent magnet is also reported. To synthesize MnAlC-FeCo, mechanical alloying and dry mixing of MnAlC and FeCo nanoparticles are accomplished followed by annealing in a furnace. Overall, the achieved results in this work enable synthesis of high moment FeCo and high coercivity CoxC with desired structure and magnetic properties obtained through polyol method. In particular, this Dissertation provides the technique to fabricate cobalt carbide nanoparticles without using rare earth elements as a catalyst or as heterogeneous seed nuclei at any stage of the processing.
Author | : Jonathan Cowen |
Publisher | : |
Total Pages | : 5 |
Release | : 2016 |
Genre | : |
ISBN | : |
Download Synthesis and Characterization of Cobalt-containing Nanoparticles on Alumina: a Potential Catalyst for Gas-to-liquid Fuels Production Book in PDF, ePub and Kindle
Author | : Zachary John Huba |
Publisher | : |
Total Pages | : 156 |
Release | : 2014 |
Genre | : Chemistry, Inorganic |
ISBN | : |
Download Synthesis and Characterization of Cobalt Carbide Based Nanomaterials Book in PDF, ePub and Kindle
Permanent magnets are used heavily for multiple applications in industry and current electronic technologies. However, the current permanent landscape is muddled by high cost of materials and insufficient magnetic or thermal properties. The primary focus of this dissertation work is the synthesis and optimization of a new permanent magnetic material, in the form of cobalt carbide nanomaterials. The optimization revolved around controlling the crystal phase and particle shape of synthesized cobalt carbide particles; these parameters have significant impact on the observed magnetic properties of magnetic nanoparticles. Co3C was identified to be the preferred crystal phase, leading to better magnetic properties. Cobalt Fumarate was found to be the ideal precursor to synthesize anisotropic Co3C particles and enhance magnetic properties of the synthesized cobalt carbide particles. Lastly, an ethanol based reduction system was employed to develop the greener synthesis of Co and Ni magnetic particles.
Author | : Khan Maaz |
Publisher | : BoD – Books on Demand |
Total Pages | : 168 |
Release | : 2017-12-06 |
Genre | : Science |
ISBN | : 9535136674 |
Download Cobalt Book in PDF, ePub and Kindle
Cobalt is a brittle, hard, silver-grey transition metal with high melting point, hard-wearing at elevated temperatures, good corrosion resistance and improved chemical, magnetic and mechanical properties. This book aims to provide in-depth study and analyses of various synthesis and processing techniques and characterization of cobalt that can lead to its increased applications in recent technology. This book presents deep understanding of the new techniques from basic to the advance level for scientists and engineers. The chapters cover all major aspects about cobalt and its application in material characterization with special emphasis on both theoretical and experimental aspects. This book addresses engineering professionals, students and materials scientists.
Author | : Hari Lal Bhatta |
Publisher | : |
Total Pages | : 102 |
Release | : 2011 |
Genre | : Cobalt |
ISBN | : |
Download Synthesis and Characterization of Cobalt Nanoparticles for Biomedical Applications Book in PDF, ePub and Kindle
Nanomaterial research has attracted a great deal of enthusiasm from the public because of the applications of nanomaterials in various areas of science such as physics, chemistry, medicine, and materials science. Biocompatible and nontoxic cobalt nanoparticles have biomedical applications including drug delivery, cell and deoxyribonucleic acid (DNA) separation, gene cloning, and magnetic resonance imaging. The main aim of this research project is to produce contamination-free cobalt nanoparticles for biomedical applications. Pulsed Laser Deposition (PLD) technique was used to fabricate contamination-free cobalt nanoparticles directly from cobalt foil. A KrF laser having laser pulses of wavelength 248 nm, pulse duration of 20 ns, and repetition rate of 10 Hz was employed in pulsed laser deposition technique. The synthesized cobalt nanoparticles were characterized using UV-Vis absorption spectroscopy and dynamic laser light scattering (DLLS). The synthesized cobalt nanoparticles were stabilized in glucose solutions of various concentrations. The UV-Vis absorption peak around 268 nm confirms the presence of cobalt nanoparticles in aqueous media. The DLLS size distribution of cobalt nanoparticles has been found in the range between 355 nm to 465 nm with variation of growth parameters such as laser energy, number of shot, and glucose concentration. Glucose stabilized cobalt nanoparticles have been successfully functionalized with DNA and laser modified DNA. The binding of cobalt nanoparticles with DNA plays an important role in the future for gene delivery.
Author | : Yasemin Yıldız |
Publisher | : BoD – Books on Demand |
Total Pages | : 122 |
Release | : 2019-12-18 |
Genre | : Science |
ISBN | : 1789845580 |
Download Cobalt Compounds and Applications Book in PDF, ePub and Kindle
In addition to theoretical information, this book provides information on cobalt compounds and nanoparticles made at selected universities and research centers around the world.This book includes information on new cobalt approaches, nanostructured cobalt, and new catalysts in some reactions and biological systems and technologies.I deeply appreciate the authors? great contributions to this work.We hope that the book will shed light on new horizons for scientists, engineers, and students.
Author | : Yibing Zhou |
Publisher | : |
Total Pages | : 128 |
Release | : 2008 |
Genre | : Cobalt alloys |
ISBN | : |
Download Synthesis and Spectroscopic Characterization and Magnetic Properties of Some Cobalt (II) and Cobalt (III) Complexes Book in PDF, ePub and Kindle
Author | : Sarah Grace Rasmussen |
Publisher | : |
Total Pages | : 200 |
Release | : 2009 |
Genre | : |
ISBN | : |
Download Synthesis and Characterization of Ferromagnetic Polymer-Coated Cobalt Nanoparticles in Multi-Gram Quantities Book in PDF, ePub and Kindle
ABSTRACTFerromagnetic cobalt nanoparticles (CoNPs) are of interest due to their inherent dipolar properties which enable one-dimensional (1-D) nanoparticle self-assembly. As their magnetic properties change drastically with their size, the ability to selectively synthesize monodisperse metallic nanoparticles of varying diameters remains a crucial challenge. Although there have been extensive studies performed on various metallic nanoparticles yielding superparamagnetic materials (such as Fe3O4, Fe2O3, Co metals), research concerning the synthesis of ferromagnetic materials has only recently resurged within the last 20 years. In this work, methods for the synthesis of ferromagnetic cobalt nanoparticles on multi-gram scales were investigated. A one-pot synthetic method which produced up to 4 grams of cobalt nanoparticles per reaction was developed, and it was also found that this reaction had a direct correlation with particle size and reaction temperature, allowing for the large-scale synthesis of polystyrene-coated cobalt nanoparticles of pre-selected diameters.