Materials Literature
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Tendencies toward local atomic ordering in (A,A\ensuremath{'})(B,B\ensuremath{'})O${}_{3\ensuremath{-}\ensuremath{\delta}}$ mixed composition perovskites are modeled to explore their influence on thermodynamic, transport, and electronic properties. In particular, dopants and defects within lanthanum chromate perovskit…
We report a simple wet chemical technique to coat single wall carbon nanotubes (SWCNTs) with Cu nanoparticles. The SWCNT/Cu hybrid nanostructure has been characterized using field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), energy dispersive X-ray analysis (…
The rare Hg-sulfosalt, marrucciite, with ideal formula Hg 3 Pb 16 Sb 18 S 46 , was found in the Gelnica ore deposit (Spisko-Gemersk Rudohorie Mts., Slovak Republic). It occurs as acicular crystals up to 0.5 mm in length and fine-grained aggregates up to 1 mm in quartz (+siderite/dolomite) gangue in association with ot…
We show that for impacting argon clusters, both mean projected ranges of the constituents and depths of radiation damage in diamond scale linearly with momentum. The same dependence was earlier found for keV-energy cluster implantation in graphite, thus suggesting the universality of this scaling law. For diamond, a g…
We studied the electronic properties of beta-platinum dioxide (\ensuremath{\beta}-PtO${}_{2}$), a catalytic material, based on density functional theory. Using the GGA+U method, which reproduces the GW band structures and the experimental structural parameters, we found that the creation of an oxygen vacancy will indu…
We present a novel analytical approach to describe biofilm processes considering continuum variation of both biofilm density and substrate effective diffusivity. A simple perturbation and matching technique was used to quantify biofilm activity using the steady-state diffusion-reaction equation with continuum variable…
Abstract Using electrospinning technique polystyrene (PS) nanofibers in the thickness range from 150 to 800 nm have been produced. Electron microscope inspections reveal the relatively uniform thickness of the obtained fibers. The mechanical deformation mechanisms have been studied in tension tests using micro‐tensile…
Abstract Polymerizable ionic liquids (ILs) 1‐methyl‐3‐(4‐vinylbenzyl)imidazolium chloride, 1‐hexyl‐3‐(4‐vinylbenzyl)imidazolium chloride and 1‐dodecyl‐3‐(4‐vinylbenzyl)imidazolium chloride were prepared and used as new surfactants for the modification of montmorillonite (MMT). Functionalized MMTs were prepared by cati…
Boronic acids, known to bind diols, were screened to identify non-inflammatory cross-linkers for the preparation of glucose sensitive and insulin releasing agglomerates of liposomes (Agglomerated Vesicle Technology-AVT). This was done in order to select a suitable replacement for the previously used cross-linker, Conc…
The low-frequency ($<80$ cm${}^{\ensuremath{-}1}$) optical modes appearing in the dielectric spectra at low temperature are determined across the morphotropic phase boundary of disordered $\mathrm{Pb}(\mathrm{Zr},\mathrm{Ti}){\mathrm{O}}_{3}$ solid solutions from the use of first-principles-based molecular dynamics…
Self-assembly from mixed dispersions of three sizes of monodisperse polystyrene nanoparticles, large (L), medium (M), and small (S), was controlled by coating each particle type with either a monofunctional or bifunctional polymer capable of participating in specific complexation reactions. The complexation reactions…
Although Fe-Pd alloy thin films are highly promising for magnetic shape memory actuation in biomedical applications and miniaturized devices, phase formation and thermodynamic properties are still poorly understood. In the present study we employ density-functional theory and ab initio molecular-dynamic simulations on…
High-molecular-weight un-cross-linked poly( p- xylylene) (PPX) derivatives ( 3 ) with one lateral linear alkyl substituent (methyl–octyl) on each phenylene moiety were prepared by pyrolysis of corresponding paracyclophanes followed by chemical vapor deposition (CVD). Most of these PPX derivatives showed good solubilit…
Electrically driven gallium movement in carbon nanotubes is discussed. A higher current (~15 mA) makes the gallium migrate sharply toward the anode, which increases its mass transport speed with time in the range of 0 to more than 10.345 fg s(-1). In contrast, a lower current (~2 mA) only drives gallium to contact the…
This article concerns the design of antireflection structures which, placed on a photonic crystal surface, significantly diminish the fraction of energy lost to reflected waves. After a review of the classes of these structures proposed to date, a new method is presented in detail for the design of antireflection grat…
We have fabricated Er doped germanium nanowires of different diameters by pulsed laser deposition and chemical methods. Er induced photoluminescence emission due to the intra-4f (4)I(13/2)→(4)I(15/2) transition of Er energy levels at 1.53 µm has been achieved at room temperature using both resonant (980 nm) and non-re…
Pressure-induced structural transformations in relaxor-based perovskite-type (ABO${}_{3}$) 0.9PbZn${}_{1/3}$Nb${}_{2/3}$O${}_{3}$-0.1PbTiO${}_{3}$ single crystals which have a very high piezoelectric response were studied by single-crystal x-ray diffraction and Raman spectroscopy at room temperature and pressures up t…
We demonstrate a one-step approach for selecting the number of walls formed during carbon nanotube (CNT) growth by catalytic decomposition of CH(4) over Fe-Mo/MgO catalysts. Scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), thermal gravimetric analysis (TGA) and Raman spectr…
Co-doped glass–ceramics containing spinel nanocrystals attach much attention as optical materials. The composition and preparation conditions of the material will influence its structure and optical properties. In this study, the samples (100– x )Co 0.1 Zn 0.9 Al 2 O 4 – x SiO 2 ( x = 0–95) were prepared by the sol–ge…
This study examines the composition of certain hydrates (calcium silicate, aluminum silicate, and related phases) produced by the pozzolanic reaction of waste‐paper sludge that had previously been activated at different temperatures. It summarizes and compares the evolution of the oxide compounds, and records their st…