Nanomagnetics Magnetic Nanoparticles Filled Carbon Nanotubes

This book provides an overview of select army research laboratory studies on carbon nanotubes. Topics include increasing the capacitance of carbon nanotube (CNT)-or graphene-based supercapacitors by adding pseudocapacitive manganese oxide nanoparticles; electrochemical double layer capacitors fabricated using carbon nanotube (CNT)/paper flexible electrodes; improving microbolometric response using carbon nanotubes; nanomagnetics-magnetic nanoparticles filled carbon nanotubes; and the performance of carbon nanotubes in extreme conditions and in the presence of microwaves.

Carbon nanotubes have been studied extensively in relation to fullerenes, and together with fullerenes have opened a new science and technology field on nano scale materials. A whole range of issues from the preparation, structure, properties and observation of quantum effects in carbon nanotubes in comparison with 0-D fullerenes are discussed. In addition, complementary reviews on carbon nanoparticles such as carbon nano-capsules, onion-like graphite particles and metal-coated fullerenes are covered. This book aims to cover recent research and development in this area, and so provide a convenient reference tool for all researchers in this field. It is also hoped that this book can serve to stimulate future work on carbon nanotubes.

The field of C-nanoparticles toxicity is, at present, fragmented and contradictory, oscillating between enthusiastic raptures and bitter disappointments. This important book presents an overall, unitary view of the carbon nanoparticle world, in which both the positive and negative aspects of these recently discovered nanomaterials are critically de

Carbon Nanotubes and Graphene is a timely second edition of the original Science and Technology of Carbon Nanotubes. Updated to include expanded coverage of the preparation, purification, structural characterization, and common application areas of single- and multi-walled CNT structures, this work compares, contrasts, and, where appropriate, unitizes CNT to graphene. This much expanded second edition reference supports knowledge discovery, production of impactful carbon research, encourages transition between research fields, and aids the formation of emergent applications. New chapters encompass recent developments in the theoretical treatments of electronic and vibrational structures, and magnetic, optical, and electrical solid-state properties, providing a vital base to research. Current and potential applications of both materials, including the prospect for large-scale synthesis of graphene, biological structures, and flexible electronics, are also critically discussed. Updated discussion of properties, structure, and morphology of biological and flexible electronic applications aids fundamental knowledge discovery Innovative parallel focus on nanotubes and graphene enables you to learn from the successes and failures of, respectively, mature and emergent partner research disciplines High-quality figures and tables on physical and mathematical applications expertly summarize key information – essential if you need quick, critically relevant data

We present a high yield filling technique of multi-walled carbon nanotubes (MWCNTs), grown vertically on a SiO2 substrate, with magnetic nanoparticles using pulsed laser deposition (PLD). Magnetization measurements in-plane and out-of-plane with respect to the sample surface indicate reasonable coercivity estimated at 0.4 T. The magnetic anisotropy is however found to be randomly oriented, indicating a polycrystalline structure. The unique difference between the in-plane and out-of-plane magnetizations is the sharing produced by the demagnetizing field in the perpendicular direction.

Carbon nanotubes (CNTs), because of their unique properties and potential use in a variety of applications, are probably the most studied class of nanomaterials. Functionalized CNTs, which can be easily manipulated and modified by covalent or non-covalent functionalization, appear as new tools in biotechnology and biomedicine. Indeed, CNTs have optical, electronic and mechanical properties that can be exploited in biological or biomedical applications. Metallic magnetic nanoparticles (MMNPs) of the 3d series and their alloys exhibit excellent magnetic properties unlike their oxide counterparts, which can be exploited in biomedicine and ultra-high density magnetic recording. When confined in CNTs nano-materials can have different properties and behaviors compared to bulk materials. Various confinement effects resulting from the interaction between the confined materials and the internal cavities of CNTs provide opportunities for regulating or designing new nanocomposites. This thesis is devoted to the study of a new approach for the development of nanocomposite materials MMNPs@CNTs and their properties. MMNPs of controlled size and shape of Co and Fe were synthesized with novel aromatic ligands as stabilizers. These MMNPs were then selectively introduced into the cavity of CNTs due to repulsive/attractive interactions between the functionalized multi-walled CNTs and the MMNPs. We were then interested in the protection of these nanoparticles from oxidation by air. Thus, confined iron nanoparticles have been coated with polyisoprene. To do this, the surface of the Fe nanoparticles has been modified with a polymerization catalyst by ligand exchange; then, polymerization of isoprene was conducted inside the channel of CNTs. The protection from oxidation by the polyisoprene was evaluated by magnetic measurements after exposure to air. Quite surprisingly, this study showed that the iron nanoparticles the more resistant to oxidation were those obtained after ligand exchange and without polymerization. In this case only, the original properties of the nanoparticles are maintained after venting. Finally, magnetic bimetallic nanostructures (particles or rods) combining Pt and cobalt or iron were obtained and confined in CNTs. Their chemical structure orderings were also studied by thermal annealing studies. The work developed in this thesis opens up new perspectives for the production of new MMNPs@NTC nanocomposites resistant to oxidation.

A comprehensive survey of carbon nanostructure magnetism, emphasizing both the fundamental nature of the field and its groundbreaking nanotechnological applications.

Magnetism and Spintronics in Carbon and Carbon Nanostructured Materials offers coverage of electronic structure, magnetic properties and their spin injection, and the transport properties of DLC, graphene, graphene oxide, carbon nanotubes, fullerenes, and their different composite materials. This book is a valuable resource for those doing research or working with carbon and carbon-related nanostructured materials for electronic and magnetic devices. Carbon-based nanomaterials are promising for spintronic applications because their weak spin-orbit (SO) coupling and hyperfine interaction in carbon atoms entail exceptionally long spin diffusion lengths (~100μm) in carbon nanotubes and graphene. The exceptional electronic and transport features of carbon nanomaterials could be exploited to build multifunctional spintronic devices. However, a large spin diffusion length comes at the price of small SO coupling, which limits the possibility of manipulating electrons via an external applied field. Assesses the relative utility of a variety of carbon-based nanomaterials for spintronics applications Analyzes the specific properties that make carbon and carbon nanostructured materials optimal for spintronics and magnetic applications Discusses the major challenges to using carbon nanostructured materials as magnetic agents on a mass scale

Giant Moment Enhancement of Magnetic Nanoparticles Embedded in Multi-Walled Carbon Nanotubes: Consistent with Ultrahigh Temperature Superconductivity.