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Plasma synthesis and HPHT consolidation of bn nanoparticles, nanospheres, and nanotubes to produce nanocrystalline cubic boron nitride
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Stout, Christopher. Plasma synthesis and HPHT consolidation of bn nanoparticles, nanospheres, and nanotubes to produce nanocrystalline cubic boron nitride. Retrieved from https://doi.org/doi:10.7282/T3PZ5C80

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TitlePlasma synthesis and HPHT consolidation of bn nanoparticles, nanospheres, and nanotubes to produce nanocrystalline cubic boron nitride
NameStout, Christopher (author); Kear, Bernard (chair); Tse, Stephen (co-chair); Klein, Lisa (internal member); Carlucci, Donald (outside member); Rutgers University; Graduate School - New Brunswick
Date Created2017
Other Date2017-01 (degree)
SubjectMaterials Science and Engineering, Boron nitride, Nanoparticles
Extent1 online resource (x, 149 p. : ill.)
DescriptionPlasma methods offer a variety of advantages to nanomaterials synthesis. The process is robust, allowing varying particle sizes and phases to be generated simply by modifying key parameters. The work here demonstrates a novel approach to nanopowder synthesis using inductively-coupled plasma to decompose precursor, which are then quenched to produce a variety of boron nitride (BN)-phase nanoparticles, including cubic phase, along with short-range-order nanospheres (e.g., nano-onions) and BN nanotubes. Cubic BN (c-BN) powders can be generated through direct deposition onto a chilled substrate. The extremely-high pyrolysis temperatures afforded by the equilibrium plasma offer a unique particle growth environment, accommodating long deposition times while exposing resulting powders to temperatures in excess of 5000K without any additional particle nucleation and growth. Such conditions can yield short-range ordered amorphous BN structures in the form of ~20nm diameter nanospheres. Finally, when introducing a rapid-quenching counter-flow gas against the plasma jet, high aspect ratio nanotubes are synthesized, which are collected on substrate situated radially. The benefits of these morphologies are also evident in high-pressure/high-temperature consolidation experiments, where nanoparticle phases can offer a favorable conversion route to super-hard c-BN while maintaining nanocrystallinity. Experiments using these morphologies are shown to begin to yield c-BN conversion at conditions as low as 2.0 GPa and 1500°C when using micron sized c-BN seeding to create localized regions of high pressures due to Hertzian forces acting on the nanoparticles.
NotePh.D.
NoteIncludes bibliographical references
Noteby Christopher Stout
Genretheses, ETD doctoral
Persistent URLhttps://doi.org/doi:10.7282/T3PZ5C80
Languageeng
CollectionGraduate School - New Brunswick Electronic Theses and Dissertations
Organization NameRutgers, The State University of New Jersey
RightsThe author owns the copyright to this work.
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