Materials Literature
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Nitrogen oxides (NOx) are major air pollutants as they have adverse effects on health and the environment. Various types of combustion equipment, including biosolids incinerators, are the sources of NOx emissions in the atmosphere. Various source control measures in the form of the use of low NOx burners and burner st…
Axial strain is introduced into individual single wall carbon nanotubes (SWCNTs) suspended from a trench-containing Si∕SiO2 substrate by employing the van der Waals interaction between the SWCNT and the substrate. Resonance Raman spectroscopy is used to characterize the strain, and up to 3% axial strain is observed. I…
The authors demonstrate the production of amorphous fluorinated carbon (a-C:F) thin film with adjustable wetting properties, inducing variable liquid crystal (LC) pretilt angles. To control the surface wetting properties, they apply a dual radio frequency magnetron system with a controlled power ratio of targets. In t…
Presently existing THz electromagnetic metamaterials were mostly produced as planar single layer structures, either deposited on a substrate or embedded in a polymer matrix, and patterned by a primary pattern generator such as an electron beam writer or a laser writer. Some attempts to produce more voluminous structur…
Abstract Scanning electron microscopy (SEM) study of the morphologic change of high‐density polyethylene (HDPE) surface grafted with glycidyl methacrylate (GMA) was reported. Radiation‐induced grafting of GMA onto HDPE was carried out in acetone and dichloromethane solution, respectively. The effects of irradiation do…
Magneto-optical techniques in reflection geometry turn out to be a very efficient tool to study the surface magnetism due to their sensitivity to magnetic and chemical variations across the sample depth. The existence of a surface layer of about one to five unit cells with strongly depressed magnetic properties, when…
PA6/PP nanocomposites with either polyethylene octene elastomer grafted maleic anhydride (POEgMAH) or PP grafted maleic anhydride (PPgMAH) as compatibilizer were prepared using co-rotating twin-screw extruder followed by injection molding. The mechanical and microstructural properties of the composites were investigat…
Abstract The alternating‐current and electrical conductivity of conductive, carbon black reinforced, microcellular ethylene–propylene–diene monomer vulcanizates was measured in the frequency range of 100 Hz to 1 MHz. The effects of variations in the filler and blowing‐agent loadings on the dielectric constant and perc…
The authors report on an electrically variable Fabry-Pérot interferometer constructed from the organic material tris(8-hydroxyquinoline) aluminum (Alq3). A two-turn helical Alq3 film with a 300nm pitch is deposited via glancing angle deposition. Electrostatic compression of the nanosprings between parallel, partially…
347 nm ultraviolet (UV) electroluminescence (EL) originated from the near-band-edge emission of MgxZn1−xO was realized on a MgxZn1−xO-based metal-insulator (SiO2)-semiconductor (MIS) structure on a silicon substrate. Compared with the EL performance of the MgxZn1−xO∕n+-Si heterojunction, the MgxZn1−xO-based MIS struct…
We study two-dimensional transport of quasirelativistic electronic excitations in graphene in the presence of Coulomb impurities and topological structural defects described by static long-range-correlated random scalar and vector potentials, respectively. Our results for the transport and cyclotron rates as well as t…
Based on careful thermometric analysis, powders of micron-sized triaminotrinitrobenzene crystallites are shown to display irreversible growth in volume when subjected to repeated cycles of heating and cooling. Such behavior is counterintuitive to typical materials’ response to thermal annealing. However, through coars…
Abstract This study explored the possibility of using poly( o ‐toluidine) (POT)/ZrO 2 nanocomposite coatings for the corrosion protection of mild steel in a chloride environment. POT/ZrO 2 nanocomposite coatings were synthesized on steel substrates through an electrochemical route. These coatings were characterized wi…
Using static magnetic fields up to 30T, the authors have measured the high-field magnetization in high-quality samples made from Re-based double perovskites: A2FeReO6 (A2=Ca2, Sr2, BaSr) and Sr2CrReO6, with Curie temperatures ranging from 360 up to 610K. The results indicate that the saturation magnetization in these…
The authors report highly nanoporous surfaces on the underside of impacted, rapidly quenched Ni droplets (splats) removed from substrates. The formation mechanism is interpreted as nucleation of gas bubbles during rapid postimpact depressurization, and subsequent freezing to a porous solid. Good agreement is found bet…
Using the thermodynamic theory, the authors developed misfit strain-temperature phase diagrams of single-domain ferroelectric-dielectric superlattices grown on cubic substrates. Owing to internal electric fields appearing in such multilayers, the superlattice diagrams are expected to be very different from phase maps…
Titanium dioxide (TiO 2 ) nanotube arrays were prepared by electrochemical anodization of titanium sheets in the glycerol 176 mL/H 2 O 44 mL/NH 4 F 0.5 wt% electrolytes modified with H 2 SO 4 and NaAc addition. The surface morphologies, average inner diameter, and the length of the nanotube arrays changed with the sol…
The authors have studied electrical properties of perovskite heteroepitaxial junctions consisting of transition metal oxides La1−xSrxMO3 (LSMO: M=Mn, Fe, Co, and Ni) and an n-type semiconductor SrTi0.99Nb0.01O3 (Nb:STO). The junctions showed rectifying current-voltage characteristics that could be analyzed by taking i…
The authors investigate the thermally driven mass transport of gold nanoparticles confined inside carbon nanotubes using molecular dynamics simulations. The observed thermophoretic motion of the gold nanoparticles correlates with the phonon dispersion exhibited by a standard carbon nanotube and, in particular, with th…
This paper presents the description of a numerical design tool for the steady state thermodynamic process analysis of SOFC/GT hybrid systems. The tool includes models for all gas turbine components and for a SOFC stack, based on the tubular fuel cell design of Siemens. The modular structure of the code allows the simu…