Search

Your search keyword '"Arianna Neal"' showing total 4 results
Start Over Author "Arianna Neal" Topic 01 natural sciences
4 results on '"Arianna Neal"'

1. Synthesis and material properties of polymer-derived niobium carbide and niobium nitride nanocrystalline ceramics

Author

Matthew Laskoski, Teddy M. Keller, Arianna Neal, Arica R. Shepherd, Boris Dyatkin, Jadah S. Clarke, Syed B. Qadri, Mehana N. Daftary, Wadia Mahzabeen, M. S. Osofsky, and Joseph Prestigiacomo

Subjects
Niobium nitride, Materials science, Niobium, Sintering, chemistry.chemical_element, 02 engineering and technology, Nitride, 01 natural sciences, chemistry.chemical_compound, 0103 physical sciences, Materials Chemistry, Ceramic, 010302 applied physics, Hydride, Process Chemistry and Technology, 021001 nanoscience & nanotechnology, Nanocrystalline material, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, chemistry, Chemical engineering, visual_art, Ceramics and Composites, visual_art.visual_art_medium, Niobium carbide, 0210 nano-technology
Abstract

Nanocrystalline niobium carbide (NbC) ceramics and niobium carbide-niobium nitride (NbC/NbN) composites were synthesized at low temperatures without high-pressure sintering using a single-step polymer-derived approach from a meltable pre-ceramic blend. Niobium hydride (NbH5) and 1,2,4,5-tetrakis(phenylethynyl)benzene (TPEB) reacted at 1500 °C under argon or nitrogen in a tube furnace to form NbC or NbC/NbN with high purities and nanosized grains. Superconductivity measurements indicated that NbC/NbN ceramics exhibited a mixed phase system with two distinct Tc values, and higher elemental niobium content within solids yielded lower Tc. The resulting ceramic monoliths exhibited homogeneous morphologies and controllable amounts of free carbon in the composite matrix. Niobium carbide and nitride composites demonstrated good air oxidation stability up to 450 °C.

Published
2021

2. Sustainable High-Temperature Phthalonitrile Resins Derived from Resveratrol and Dihydroresveratrol

Author

Benjamin G. Harvey, Mehana N. Daftary, Teddy M. Keller, Matthew Laskoski, Holly L. Ricks-Laskoski, W. Judson Hervey, Arica R. Shepherd, Jadah S. Clarke, and Arianna Neal

Subjects
Materials science, Dihydroresveratrol, Thermosetting polymer, 02 engineering and technology, General Chemistry, Resveratrol, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Phthalonitrile, chemistry.chemical_compound, chemistry, Organic chemistry, 0210 nano-technology
Published
2016

3. Synthesis of bisphenol A-free oligomeric phthalonitrile resins with sulfone and sulfone-ketone containing backbones

Author

W. Judson Hervey, Arianna Neal, Matthew Laskoski, Teddy M. Keller, Holly L. Ricks-Laskoski, and Jadah S. Clarke

Subjects
chemistry.chemical_classification, Bisphenol A, Ketone, Polymers and Plastics, Organic Chemistry, Thermosetting polymer, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Sulfone, Phthalonitrile, chemistry.chemical_compound, chemistry, Polymer chemistry, Materials Chemistry, Organic chemistry, 0210 nano-technology
Published
2016

4. Phthalonitrile Blends: Simple Way to Improve Physical Properties by Increasing Crosslinking Density

Author

Arianna Neal, Matthew Laskoski, Jadah S. Clarke, and Teddy M. Keller

Subjects
chemistry.chemical_classification, Materials science, Ketone, Polymers and Plastics, Softening point, Organic Chemistry, Thermosetting polymer, Ether, 02 engineering and technology, Polymer, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, 0104 chemical sciences, Phthalonitrile, chemistry.chemical_compound, chemistry, Crosslinked polymers, Polymer chemistry, Materials Chemistry, Physical and Theoretical Chemistry, 0210 nano-technology
Abstract

A method to improve the mechanical properties of phthalonitrile (PN) resins at lower postcure temperatures is achieved by blending a second-generation oligomeric aromatic ether ketone-based PN resin with 1,1,1-tris-[4-(3,4-dicyanophenoxy)phenyl]ethane in varying concentrations. Most of the mixtures exhibit a single softening temperature indicating that the two resins are miscibile in one another at the respective concentrations. After various blends are thermally cured to several postcure temperatures yielding crosslinked polymers, the polymers demonstrate superb mechanical properties and thermooxidative stability at lower overall postcure temperatures.

Published
2017

Catalog

Books, media, physical & digital resources
See catalog results