Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 14 of 14 for “"turbostratic"”.
-
High strength carbon nanofibers derived from electrospun polyacrylonitrile
… of carbonized nanofibers. The formation of turbostratic carbon crystallites with thicknesses increasing from 3 to 8 layers between 800°C and 1700°C improved the elastic modulus and tensile strength but was also the source for the strength reduction of nanofibers exposed to 1700°C. The …
-
Mechanical and interfacial properties of carbon nanofibers for polymer nanocomposites
… Under uniaxial tension, cleavage of the outer turbostratic layer occurred first, followed by relative slip of the internal oblique graphene layers. The change in the mechanical strength (Weibull strength), and its scatter (Weibull moduli), with heat treatment correlated well with the fiber …
-
Design of active, stable, and earth-abundant acidic oxygen evolution catalysts
… a lower bulk manganese oxidation state and turbostratic disorder. This catalyst architecture was redesigned in the third iteration as a mixed metal oxide where functionality is decoupled into separate metals: Co was employed as the catalytic element while Mn served as the structural …
-
Thin Film van der Waals Heterostructures containing MoSe2 from Modulated Elemental Precursors
… shows the importance of rotational (i.e. “turbostratic”) disorder on lowering cross-plane thermal conductivity in two systems—MoSe2 and the (SnSe2)1(MoSe2)1.32 heterostructure. The binary systems exhibits ultralow thermal conductivity that rivals that of WSe2, yet some interlayer atomic …
-
The formation of carbon nanofibers and thin films from the catalytic decomposition of ethylene by palladium
… here was never fully graphitic, and instead was turbostratic or nearly amorphous. Based on the findings of the general catalysis study, the promise of application for the carbon nanofibers was anticipated and demonstrated through the formation of fibrous carbon foams. These foams can be generated …
-
Fundamental Understanding and Functionality of Silicon Oxycarbide
… of metal silicides, silicon carbide, and turbostratic carbon with the catalytic activity corresponding to Fe > Co > Ni, which agrees with the activation energy calculation. Also, the phase separation of SiOC was proved to be predominant than local carbothermal reduction. In addition to …
-
Ultra low thermal conductivity in layered disordered crystalline materials
… diffraction peak. Multilayer films incorporating turbostratic TiTe2 enable studies of the effective thermal conductivity of Bi2Te3 layers as thin as 2 nm. In the limit of small grain size or layer thickness, the thermal conductivity of Bi2Te3 approaches the predicted minimum thermal conductivity …
-
Application of scalable and inexpensive modification on carbon in clean technologies
… with a unique structure (crumbled balls with turbostratic multi-layer graphene sheets) produced by a high-temperature gas detonation process is explored for N-doping via a post-growth thermal annealing process. From the linear sweep voltammetry in O₂-saturated 0.50 M H₂SO₄ solution by rotating …
-
Molecular Crosslinking of Calcium-Silicate-Hydrate with Organosilanes: Toward Engineering of Cementitious Matrices with High Thermal Resistance
… the novel organic-inorganic gels have layered turbostratic molecular structure with certain similarities to C-S-H precipitating in hydrating cement paste. The organic molecules' chain length controls the interlayer distance, which shows little to no shrinkage upon dehydration up to 105 °C. …
-
Correlated NanoSIMS, TEM, and XANES Studies of Presolar Grains
… reported nanocrystalline core surrounded by turbostratic graphite within a low-density SN graphite grain. Nanocrystalline cores consisting of randomly-oriented 2-4 nm sheets of graphene and surrounded by concentric shells of graphite have been observed in high-density presolar graphite grains …
-
Carbon nanotubes and graphene in aqueous surfactant solutions : molecular simulations and theoretical modeling
… including the AB-stacked species and various turbostratic species. Third, I showed that the free energy of diazonium adsorption onto the SWCNT-surfactant complex, determined using PMF calculations, can be used to rank surfactants (SC, SDS, and CTAB) in terms of the extent of functionalization …
-
Heteroatom-Doped Graphitic Materials for Energy Storage
… graphite within Li- and Na-ion batteries. Turbostratic doped graphitic materials were produced through pyrolysis of organic material. In Chapter 2, investigations into nitrogen-doping are made. Alterations to the synthetic procedure in combination with thorough structural and compositional …
-
Beyond Flash Joule Heating: Advanced Non-equilibrium Synthesis and Electron Microscopy Characterization
… in transforming various carbon sources into turbostratic flash graphene, synthesizing refractory materials such as metal carbides, converting 2H-phase MoS2 into 1T-phase MoS2, and extracting valuable hydrogen gas from plastic waste. Despite these impressive achievements, FJH still faces …
-
Next Generation Multifunctional Composites for Impact, Vibration and Electromagnetic Radiation Hazard Mitigation
… these filaments were revealed to be amorphous (turbostratic) carbon. Plasma sputtering was utilized to sputter nickel nano-films on the surface of the substrate carbon fibers. These films were later fragmented into nano-sized nickel islands from which CNTs were grown utilizing the GSD technique. …