Journal ArticleDOI
Preparation and properties of ferromagnetic carbon‐coated Fe, Co, and Ni nanoparticles
TLDR
In this paper, an arc discharge process modified in the geometry of the anode and the flow pattern of helium gas was used to produce carbon-coated iron, cobalt, and nickel particles.Abstract:
Carbon‐coated iron, cobalt, and nickel particles were produced by an arc discharge process modified in the geometry of the anode and the flow pattern of helium gas. Field emission scanning electron microscopy shows that the resulting material consists of only carbon‐coated metal particles without any nanotubes or other unwanted carbon formations present. The diameters of iron, cobalt, and nickel particles range predominantly from 32 to 81 nm, 22 to 64 nm, and 16 to 51 nm, respectively. X‐ray diffraction analysis confirmed that the as‐made particles are carbon‐coated elements rather than metal carbides. High resolution transmission electron microscopy reveals that the as‐made cobalt and nickel particles are covered by 1–2 graphitic layers, while iron particles are surrounded by amorphous carbon. When the samples were treated by annealing or immersion into nitric acid, particles completely coated by carbon resisted both postdeposition treatments. However, further graphitization of the carbon coating by eith...read more
Citations
More filters
Journal ArticleDOI
Engineering Carbon Materials from the Hydrothermal Carbonization Process of Biomass
TL;DR: It will be demonstrated that the HTC process can rationally design a rich family of carbonaceous and hybrid functional carbon materials with important applications in a sustainable fashion.
Journal ArticleDOI
Mechanics of carbon nanotubes
TL;DR: The theoretical predictions and the experimental techniques that are most often used for the challenging tasks of visualizing and manipulating these tiny structures are reviewed and the computational approaches taken, including ab initio quantum mechanical simulations, classical molecular dynamics, and continuum models are outlined.
Journal ArticleDOI
Magnetic nanoparticles: preparation, structure and properties
TL;DR: In this paper, the key methods for the preparation of magnetic nanoparticles are described systematically and the experimental data on their properties are analyzed and generalised, as well as the main theoretical views on the magnetism of nanoparticles were considered.
Journal ArticleDOI
Size effect on the crystal phase of cobalt fine particles
TL;DR: In this paper, the size dependence of the crystal phase of the Co fine particles was investigated, and it was shown that the stabilization of crystal phase is the intrinsic effect caused by the small dimensionality of fine particles.
Journal ArticleDOI
Catalytic graphitization of templated mesoporous carbons
Marta Sevilla,Antonio B. Fuertes +1 more
TL;DR: Graphitic porous carbons with a wide variety of textural properties were obtained by using a silica xerogel as template and a phenolic resin as carbon precursor.
References
More filters
Book
CRC Handbook of Chemistry and Physics
TL;DR: CRC handbook of chemistry and physics, CRC Handbook of Chemistry and Physics, CRC handbook as discussed by the authors, CRC Handbook for Chemistry and Physiology, CRC Handbook for Physics,
Journal ArticleDOI
Solid C60: a new form of carbon
TL;DR: In this article, a new form of pure, solid carbon has been synthesized consisting of a somewhat disordered hexagonal close packing of soccer-ball-shaped C60 molecules.
Journal ArticleDOI
Single crystal metals encapsulated in carbon nanoparticles.
TL;DR: Observation of crystals of pure encapsulated α-LaC2 that were exposed to air for several days before analysis indicates that the LaC2 is protected from degradation by the carbon polyhedral shells of the nanoparticles, a new class of materials that can be protected in their pure or carbide forms and may have interesting and useful properties.
Journal ArticleDOI
Particle Size Dependence of Coercivity and Remanence of Single‐Domain Particles
E. F. Kneller,F. E. Luborsky +1 more
TL;DR: In this paper, the coercive force and remanence of essentially spherical iron and iron-cobalt alloy particles with diameters from 20 to 3000 A have been measured at 4°, 76°, and 207°K and compared to the theoretically predicted behavior.
Journal ArticleDOI
Superparamagnetism in carbon-coated Co particles produced by the Kratschmer carbon arc process.
TL;DR: A process based on the Kratschmer-Huffman carbon arc method of preparing fullerenes has been used to generate carbon-coated cobalt and cobalt carbide nanocrystallites, which exhibits a unique functional dependence on H/T, and hysteresis below a blocking temperature.