Materials Literature
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In this work, we produced SWNTs by a hydrogen DC arc discharge with evaporation of carbon anode containing 1 at% Fe catalyst in H2-Ar mixture gas. This was named as FH-arc discharge method. The as-grown SWNTs synthesized by FH-arc discharge method have high crystallinity. An oxidation purification process of as-grown…
In the arc plasma jet (APJ) method, a large amount of soot including single wall carbon nanotubes (SWNTs) can be produced in a short time. However, as-grown soot contains a lot of impurities, such as metallic particles used as catalyst and amorphous carbon. Hence it is necessary to purify the soot to obtain pure SWNTs…
In this research work, copper core yarns with cotton/polyester sheaths were produced by friction spinning machines and their woven fabrics were made by looms with varying fabric structures for electromagnetic (EM) shielding purposes. The effect of varying structures, varying materials, varying numbers of layers, core…
We systematically investigate the catalytic properties of Al2O3 particles in the growth of carbon nanotubes (CNTs) in chemical vapor deposition (CVD). Compared with the conventional metal catalysts, the particle size of Al2O3 catalyst has no influence on the number of nanotube walls because only single-walled carbon n…
The compressibility of several nucleic acid and globular protein crystals has been investigated by high-pressure macromolecular crystallography. Further, crystal structures at four different pressures allowed the determination of the intrinsic compressibility versus pressure of d(GGTATACC) 2 and hen egg-white lysozyme…
Surface discharges along oil-immersed solids used as insulators and supports in high-voltage pulsed-power equipment can lead to catastrophic system failures. To achieve reliable compact pulsed-power systems, it is important to quantify the electrical fields at which surface flashover, or other types of breakdown event…
Abstract The stepwise cluster growth, and formation of CdS nanoparticles from solutions of (NMe 4 ) 4 [Cd 10 S 4 (SPh) 16 ] in dimethyl sulfoxide (DMSO), dimethylformamide (DMF) and acetonitrile was investigated. Cluster growth is fast in DMSO and DMF at room temperature, and slow in acetonitrile at elevated temperatu…
Electron beam sintering of ultra‐high‐temperature ceramic material of zirconium diboride (ZrB 2 ) was successfully carried out. Scanning electron microscopy images showed that the sintered layer had smooth surface morphology. Significant grain growth was observed by increasing the electron beam current density. More u…
Helical carbon nanofibers (HCNFs), such as the carbon nanocoil (CNC) and the carbon nanotwist (CNTw), were synthesized by catalytic chemical vapor deposition using a substrate. HCNFs are classified into round and angular types according to the fiber cross-sections. When four types of HCNFs (round-type CNC and CNTw, an…
Processing of porous zirconia by direct foaming of emulsified ceramic powder suspensions was examined. Surfactant stabilized heptane droplets were homogeneously dispersed in the aqueous suspension with maximum solids loading of zirconia powder. The porosity of the sintered porous parts increased with the amount of hep…
Mechanical vibration often occurs during protein crystallization; however, it is seldom considered as one of the factors influencing the crystallization process. This paper reports an investigation of the crystallization of five proteins using various crystallization conditions in a temperature-controlled chamber on t…
Abstract The results of the seeded growth of bulk zinc oxide by chemical vapor transport (CVT) are presented. Hydrogen is used as the transport agent. Crystals with three different crystallographic directions were obtained, Zn‐terminated (0001), O‐terminated (000‐1), and non‐polar (1‐100). The tendency to maintain the…
The thermal and photoinduced phase transitions between the ferroelectric charge-ordered (CO) insulator state and the metallic state in the layered organic salt $\ensuremath{\alpha}\text{\ensuremath{-}}{(\text{ET})}_{2}{\text{I}}_{3}$ (ET: [bis(ethylenedithio)]-tetrathiafulvalene) were investigated using terahertz time…
Tenofovir disoproxil fumarate (TDF) is a nucleotide reverse transcriptase inhibitor that is used to treat HIV/AIDS. According to the literature, TDF is known to have three polymorphic forms: I, A, and B. Crystals of all three polymorphs were grown following literature procedures and characterized in the solid state us…
Aluminum oxide (Al2Ox) buffer layers were employed in carbon nanotube (CNT) growth using an alcohol gas source and Co catalyst. The CNT yield was strongly dependent on the Al2Ox buffer layer thickness. By optimizing the thickness of deposited Al, vertically aligned single-walled nanotubes (SWNTs) were grown on Si subs…
We investigated the effect of annealing in a hydrogen atmosphere on carbon nanocap formation during decomposition of a 6H-SiC(000-1) surface. It was determined that native oxides were reduced to below the detection limit of X-ray photoelectron spectroscopy after 30 min of annealing at 1200 degrees C in a hydrogen atom…
We investigate effects of surface smoothness and surface chemistry on the nature of multi-walled CNTs (MWCNTs) grown directly on FeCrAl substrates. A single sample was grown that contained a gradation in surface morphologies ranging from 2.9 nm to 30.2 nm RMS. The MWCNTs were grown using ethylene and H2 gases. Charact…
Massive carpets of well packed, vertically aligned and very long multiwall carbon nanotubes were synthesized by an efficient thermal Chemical Vapour Deposition process. Electrical properties of the material were evaluated, both in terms of "global" characteristics (bulk resistivity) and in terms of "local" properties…
In this study we examine catalyst preparation and chemical vapor deposition (CVD) parameters related to synthesis of single-walled carbon nanotubes (SWNTs) by alcohol catalytic CVD. We show that modifying the catalyst recipe considerably changes the average SWNT diameter, and vertically aligned arrays with an average…
Abstract Samples of 316LVM austenitic stainless steel were hydrostatically extruded (HE), in a multi‐step process with the total true strain of 1.84 to produce a microstructure consisting of nanotwins separated by shear bands. The twins average width is 19 nm and length 168 nm. Earlier results proved that a post‐defor…