Materials Literature
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Hydrogen diffusion experiments in 520M carbon steel were performed with the Devanathan- Statchurski permeation cell at 22°C in 0.5M NaCl at pH 7 and -800, -900 or -1050 mV SCE. The hydrogen diffusivity and subsurface concentration (C0) were evaluated by fitting a fourier series expansion of the diffusion equation to t…
Adsorption procedure of two cationic surfactants hexadecyltrimethylammonium bromide (HDTMABr) and benzyldimethylhexadecylammonium chloride (BDHDACl) onto two samples of montmorillonite was studied. Infrared spectroscopy and X-ray diffraction proved intercalation of both quaternary cations into the interlayer space of…
Nanofibrous LaMnO(3) can be immobilized on macrostructured materials using carbon nanofibers as templates; their application as macro-nanostructured catalysts are also presented.
The microstructural details of fourteen Mg–Al–Sr alloys were investigated in the as-cast form by a combination of scanning electron microscopy/energy dispersive spectrometer (SEM/EDS) analysis and quantitative electron probe microanalysis (EPMA). The heat transfer method coupled with the DSC measurement has been utili…
Conductivity spectra of ionic materials with disordered structures are usually thought to consist of several parts, i.e., the DC conductivity, a power-law component, a nearly-constant-loss feature (if identified) and the (far-)infrared conductivity caused by vibrational motion. Such a decomposition may, however, easil…
The reaction of [Cu(DapdoH(2))2](2+) ions with [Cr(III)L(MeOH)2Br](2+) ions (L = 1,4,7-trimethyl-1,4,7-triazacyclononane; DapdoH(2) = 2,6-diacetylpyridine dioxime) produced in situ in methanol, yielded, in the presence of triethylamine, the complex [L(2)Cr(III)(2)(Dapdo)2(OH)2Cu(II)(2)Br(2)](ClO(4))2. It has been char…
BACKGROUND: Insulin is a therapeutic protein that is widely used for the treatment of diabetes. Its biological function was discovered more than 80 years ago and it has since then been characterized extensively. Crystallization of the insulin molecule has always been a key activity since the protein is often administe…
Carbothermal reduction and nitridation (CRN) process was utilized to prepare magnesium aluminum oxynitride (MgAlON) and the influence of reaction variables, such as heating temperature, soaking time and the source of carbon, on the formation of MgAlON was investigated. In addition, the density of samples prepared unde…
Electron microscopy, optical microscopy, and X-ray diffraction studies of dispersions of hydrophilic and hydrophobic thiolate-capped gold nanoclusters in bolaamphiphilic liquid crystals (LCs) indicate random inclusion of the nanoclusters in the LC matrix with a concentration- and monolayer-type-dependent effect on the…
Abstract An experimental method is proposed to investigate the tensile behavior of materials at high strain rates by using a developed split Hopkinson tension bar, rotating disk indirect bar-bar tensile impact apparatus. The mechanically-filtered input tensile pulse is generated by incorporating a prefixed metal bar c…
Abstract The effect of sulfate reducing bacteria (SRB) on the hydrogen permeation rate through ferrite‐pearlite and sorbite steels of quite similar chemical composition was studied using a specially designed facility. Tests were carried out in synthetic sea water, sterile or inoculated with bacteria, at potentials cor…
An adaptive method for the selection of models in a concurrent multiscale approach is presented. Different models from a hierarchy are chosen in different subdomains of the problem domain adaptively in an automated problem simulation. A concurrent atomistic to continuum (AtC) coupling method Two error indicators are u…
The power density of a gearbox is an important consideration for many applications and is especially important for gearboxes used on aircraft. One approach to improving power density of gearing is to improve the steel properties by design of the alloy. The alloy tested in this work was designed to be case-carburized w…
With the mass production of fullerenes currently underway, and the mass production of carbon nanotubes soon to follow, only a few studies have examined the biological consequences of manmade nanoparticle exposure in the mammalian system. This study examines carbon nanoparticle (CNP) exposure in both in vitro (murine B…
The double layer capacitance of an activated carbon nanofiber (ACNF) with a 100∼200 nm fiber-diameter, prepared by the polymer blend spinning technique, was investigated using 1-ethyl-3-methylimidazolium tetrafluoroborate (EMImBF4) as the electrolyte. The conventional activated carbon fiber (ACF) with the fiber-diamet…
When microwave emitted from a point source is focused on a target by using a left-handed metamaterial (LHM) flat lens, microwave backscattered from the target will be refocused by the LHM lens in the vicinity of the point source. Numerical simulations with two-dimensional (2D) finite-difference time-domain (FDTD) meth…
In this work, we report a method of preparing porous metal oxide macrobeads using a cation-exchange resin with sulfonic acid groups as templates and aqueous solutions of metal salts as precursors. The metal–resin complexes formed on the pore surface of resins were firstly transformed into metal hydroxide precipitates…
Reduced activation ferritic/martensitic steels (RAFs) are recognized as the primary candidate structural materials for fusion blanket systems. F82H is the RAF which has been developed and studied in Japan, and F82H-IEA heat, one of the world’s first 5 ton heats of RAF, was provided and evaluated in various countries a…
In Mg alloys, twins have been known to be an important deformation mechanism. However, their roles on deformation mechanisms have not been well understood. In this work, we performed tensile test of rolled sheets of AZ31 Mg alloys at room temperature. A number of large surface reliefs were observed in a region near a…
The magnetite nanoparticles were synthesized through a process including dissolution of Fe(OH)2 and precipitation of an oxidized phase under ultrasonic irradiation in an aqueous solution. It was found that the ultrasonic irradiation accelerated the formation of magnetite. The crystallinity and magnetic properties of t…