The structures of free-standing zirconium nanowires with 0.6−2.8 nm in diameter are systematically studied by using genetic algorithm simulations with a tight-binding many body potential. Several multi-shell growth sequences with cylindrical structures are obtained. These multi-shell structures are composed of coaxial atomic shells with the threeand four-strands helical, centered pentagonal and...

The primary goal of this preparation method was synthesis of uniformly coated ZrO2/SBA-15 materials exhibiting high dispersion and accessibility of zirconium using a layerwise deposition method to minimize growth of large crystallites. SBA15 was prepared the original method by Zhao et al.1 First 10g of SBA-15 was dried at 300°C for 4 hours. Then the dried SBA-15 and 58.5g of zirconium precursor...

Zirconium oxide and tantalum oxide films were deposited in an inverted cylindrical magnetron cathode using high power pulsed sputtering. Average power densities were between 5 and 7 W/cm2 and peak power densities were in the range of 0.5 kW/cm2. In all of the experiments the oxygen was introduced using flow control, and the current and voltage waveforms of the HPPMS supply changed in a reproduc...

PURPOSE The purpose of this study was to assess the surface characteristics and the biocompatibility of zirconium (Zr) coating on Ti-6Al-4V alloy surface by radio frequency (RF) magnetron sputtering method. MATERIALS AND METHODS The zirconium films were developed on Ti-6Al-4V discs using RF magnetron sputtering method. Surface profile, surface composition, surface roughness and surface energy...

PURPOSE This paper is focused on the works concerning preparation of zirconium oxide ceramic blocks recommended for CAD/CAM systems used in prosthetic dentistry for manufacturing fixed prosthetic restorations. METHODS Zirconium-yttrium-magnesium mixed ceramic oxides were prepared by sol-gel method via hydrolysis and condensation of zirconium alkoxide precursor (zirconium (IV) propoxide) with ...

BACKGROUND An increasing demand for esthetic restorations has resulted in an increased use of all-ceramic restorations, such as zirconium. However, one of the challenges the orthodontist must be willing to face is how to increase bond strength between the brackets and various ceramic restorations.Bond strength can beaffected bybracket type, by the material that bracketsaremade of, and their bas...

DENSE PERIODICAL PATTERNS IN PHOTONIC DEVICES:TECHNOLOGY FOR FABRICATION AND DEVICE PERFORMANCEbySABARISH CHANDRAMOHANDecember 2016 Advisor: Dr. Ivan AvrutskyMajor: Electrical EngineeringDegree: Doctor of Philosophy For the fabrication, focused ion beam parameters are investigated to successfullyfabricate dense periodical patterns, such as gratings, on hard transitio...