Materials Literature
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Nanoporous BaTiO3 particles with an average diameter of 27 nm have been synthesized using a soft template based on poloxamer. The pore width has been found to be ∼10 nm. The nanoporous particles have a surface area of 107 m2gm−1. This introduces a large surface area leading to the creation of a large number of oxygen…
Cotton/polyester woven fabrics were functionalized with ZnO thin films or nanoparticles by pulsed laser deposition, using a KrF* excimer laser source. Depending on the number of applied laser pulses, well-separated nanoparticles (for 10 pulses) or compact thin films (for 100 pulses) were deposited. The synthesized nan…
The local crystal structure and phonon modes of Ba[(Fe1/2Nb1/2)1−xTix]O3 solid solutions (x = 0, 0.2, 0.4, 0.6, 0.8, 0.85, 0.9, 0.95) were investigated by Raman spectroscopy in the range of 100–1000 cm− 1 at room temperature. Typical tetragonal structure with C4v symmetry was determined for Ba[(Fe1/2Nb1/2)0.05Ti0.95]O…
This contribution presents an analytical formulation for the electromagnetic response of grids of ferromagnetic microwires, where the electromagnetic fields produced by the structure are found by means of the local field method. In addition, a circuit analogy is introduced for a better understanding of the grid respon…
Thermal aging of hydroxy-terminated polybutadiene/isophorone diisocyanate (HTPB/IPDI)-based polyurethane was studied as a function of NCO/OH ratio (1.0 and 0.85). Samples were aged in air ovens at 50, 60, 65, and 70 ºC for periods of time from 1 to 34 weeks. Changes in chemical (swelling testing and FT-IR spectroscopy…
Abstract Graphene is a truly two‐dimensional (2D) material with exceptional electronic, mechanical, and optical properties. As such, it consists of surface only and can be probed by the well‐developed surface science techniques such as, e.g ., scanning tunneling microscopy (STM). This method bridges the gap between th…
The nucleation and growth kinetics of single-wall carbon nanotubes in aligned arrays have been measured using fast pulses of acetylene and in situ optical diagnostics in conjunction with low pressure chemical vapor deposition (CVD). Increasing the acetylene partial pressure is shown to decrease nucleation times by thr…
Diffusion mass transfer in thin chalcogenide films under illumination by a focused Gaussian beam have been studied both experimentally and theoretically. It is demonstrated that depending on the light intensity, waist of the beam, and the film thickness, one can obtain formation of either hillocks or dips in the illum…
Structural, magnetic, and electrical transport properties of $\ensuremath{\delta}$-Mn${}_{x}$Ga${}_{1\ensuremath{-}x}$ epitaxial layers are investigated for alloy compositions in the range of $x=0.49\phantom{\rule{0.16em}{0ex}}...\phantom{\rule{0.16em}{0ex}}0.67$. All samples were grown by molecular beam epitaxy on Ga…
Abstract An amphiphilic diblock copolymer composed of a photoresponsive dialkoxycyanostilbene polymethacrylate and poly(ethylene oxide) (PDACS‐ b ‐PEO) was synthesized and its photophysical and aggregation properties were investigated. The amphiphilic nature of the polymer caused it to self‐assemble in water, and dyna…
Ferromagnetic, pure ZnO films were grown on Al2O3 substrates at various nitrogen pressures (0.01–1.0 mbar) and investigated with x-ray diffraction (XRD) and x-ray absorption spectroscopy. According to XRD data, the crystalline films were composed of crystallites of approximately 50 nm in size, oriented with respect to…
The temperature dependence of the dielectric properties and ac conduction of YMnO3 ceramics annealed under different atmospheres is investigated from 25 to 700 °C. The origin of the dielectric anomalies is clarified. Two dielectric peaks in the permittivity accompanied by a single anomaly in the dielectric losses char…
In this study, commercial acrylic fibers were modified with diethylenetriamine to prepare metal chelating fibers. The effects of process parameters on the efficiency of the reaction were investigated. FTIR spectroscopy and TGA analysis were used to confirm the chemical changes made to the fibers during the reaction. T…
Microwave attenuation characteristics and magnetic and dielectric properties have been studied for Ba3CoxZn2-xFe24O41 with x = 0.8 and 2.0 ferrite flaky-filler composites. Results show that μ0′ and μmax″ are enhanced by >150 and >70%, respectively, and ɛ′ and ɛ″ are almost the same, as compared to conven…
Metallic biomaterials constitute approximately 70% 80% of all implant materials, and thus represent a very important class of biomaterials. Among the various metallic biomaterials such as stainless steels and Co-Cr alloys, titanium and its alloys exhibit the best biocompatibility. Consequantly, titanium and its alloys…
ZnO nanoparticles (NPs), synthesized in an alcoholic medium at room temperature, were added to electroclinic liquid crystal (ELC) materials. The addition of ZnO NPs in ELCs, caused a remarkable shift in SmC*-SmA* phase transition which was investigated from the dielectric and electro-optical measurements. The anchorin…
Bi0.90La0.10Fe0.85Zn0.15O3/Bi0.90La0.10Fe0.95Zn0.05O3 bilayers with different thickness ratios were deposited on Pt-coated silicon substrates by radio frequency sputtering. A polycrystalline structure with a random grain orientation is induced for all bilayers, owing to the introduction of the bottom Bi0.90La0.10Fe0.9…
Ternary single crystals Pb(In0.5Nb0.5)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 with monoclinic phase poled along [011] direction show single domain state (1O state) with macroscopic mm2 symmetry. The complete set of material constants was determined using the combination of impedance and ultrasonic methods. The thickness shear vibr…
Abstract A new series of extended dithieno[3,2‐ b :2',3'‐ d ]phospholes with dendritic and non‐dendritic architectures involving phenylenevinylene as well as Fréchet‐type dendrons is presented. Modification of the phosphorus center with Pd allows for the generation of a dimeric dendrimer with Pd‐center. The synthetic…
Mn4+- and Mn2+-activated red and yellowish-green phosphors have been synthesized by the wet chemical etching of Si wafers in aqueous HF/NaMnO4 · H2O and HF/Na2Cr2O7 · 2H2O/Mn solutions, respectively. X-ray diffraction patterns suggest that the synthesized powders are Na2SiF6:Mn4+ and Na2SiF6:Mn2+ with a trigonal struc…