Materials Literature
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The authors have empirically determined the dependence of breakdown field EB versus dielectric thickness d (electrode separation) for a large number (4100) of BaTiO3-based multilayer capacitors with Ni base-metal electrodes. The data averaged over lateral area show for 6<d<22μm that EB=const×d−n, where n…
Nondestructive nanostructural analysis is indispensable in the development of nanomaterials and nanofabrication processes for use in nanotechnology applications. This paper demonstrates a quantitative, nondestructive analysis of nanostructured thin films supported on substrates and their templated nanopores by using g…
Abstract An iron(II) phthalocyanine (FePc) complex solubilized by decylamine (DA) and benzylamine (BA) is incorporated into a nanoparticulate metal oxide matrix to develop optical sensor films sensitive to NO 2 and CO. Eleven amine solvents have been tested as N ‐donor ligands that permit ligand exchange with the gas…
Extensive excited-state molecular dynamics simulations of femtosecond laser-induced structural transformation in single-walled carbon nanotubes (SWNTs) are presented. We considered in the simulation two limiting cases; one where only a short portion of the tube is irradiated and the other where the whole tube is affec…
Abstract Repetitive processing was employed to assess the recyclability of in situ microfibrillar poly(ethylene terephthalate) (PET)/high‐density polyethylene (HDPE) blends which were fabricated through a “rectangular slit die extrusion–hot stretching–quenching” process. For comparison, the conventional PET/HDPE blend…
Unterstützung für ein Radikal: Das neutrale Radikal [.P{NV[N(Np)Ar]3}2] (Np=Neopentyl, Ar=3,5-Me2C6H3) ist durch zwei Nitridovanadiumtrisanilid-Liganden über einen VIV/VV-Redoxzyklus resonanzstabilisiert (siehe EPR-Spektrum und berechnetes SOMO für [.P{NV[N(Me)Ph]3}2]). Die Verbindung liegt im Festkörper als Monomer v…
A route to high-purity nanocrystalline diamond films from C2 dimers and related mechanisms have been investigated by enhancing C2 growth chemistry in Ar-rich microwave plasmas. Efficient C2 production by direct dissociation from acetylene causes the micro- to nanocrystal transition with a low threshold Ar concentratio…
The optical and electrical properties of FeSe thin films are studied by both optical absorption and Hall measurements, which suggest that ferromagnetic FeSe is a metal instead of a semiconductor. No absorption gap is observed in the whole spectrum range from far infrared to ultraviolet. Temperature dependent transport…
Detailed studies of the phase transitions in Pb 0.99 Nb 0.02 [(Zr 0.57 Sn 0.43 ) 1− y Ti y ] 0.98 O 3 ( y = 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.10, and 0.12) ceramics as a function of composition, temperature, electric field, and time were conducted using Raman spectroscopy. At room temperature, the as-sintered cera…
Relaxor behavior has been found in the solid solution between complex perovskite Ba(Mg1∕3Nb2∕3)O3 (BMN) and ferroelectric PbTiO3 (PT), 0.4BMN-0.6PT, prepared by solid state reactions. A strong dispersion of the maximum dielectric permittivity (ε′) appears around the temperature of Tm, which shifts towards higher tempe…
Abstract Elastomers show improved properties when reinforced with nanoclay at low filler loadings, but dispersion of the clay is difficult in non‐polar polymers, such as ethylene propylene diene monomer (EPDM). In this work several compatibilization approaches were studied, including the addition of EPDM modified with…
Polymorphism of drugs has been the subject of intense interest in the pharmaceutical industry for over forty years. Although identical in chemical composition, polymorphs differ in bioavailability, solubility, dissolution rate, chemical and physical stability, melting point, colour, filterability, density, flow proper…
A general design for switchable, flat, liquid crystal diffractive lens with three-layer electrode pattern and two-layer via structures is reported for near-, intermediate-, and distance-vision corrections of presbyopic eyes. The microfabricated transparent concentric ring electrodes are distributed in two layers and d…
Tracer diffusion coefficient of 181W in α-iron has been determined in the temperature range between 833 and 1173 K using a serial sputter-microsectioning method. The temperature dependence of the diffusion coefficient, D, over the whole temperature range of α-iron across the Curie temperature (T C = 1043 K), can be ex…
Abstract Using poly(amic acid) (PAA) as a precursor followed by thermal imidization, the polyimide/silica nanocomposite films were prepared via an improved sol–gel process and a blending process, respectively. FT‐IR, TEM and TGA measurements were used to characterize the structure and properties of the obtained films.…
Abstract A genetic algorithm (GA) was used to optimize a multilayer electromagnetic shield of polyaniline (PANI)–polyurethane (PU) conducting composites in the microwave band. First, the electronic properties of freestanding films with different mass fractions of polyaniline were studied. A very low percolation thresh…
We discuss some properties of surfaces in whose unit normal vector has constant angle with an assigned direction field. The constant-angle condition can be rewritten as a Hamilton–Jacobi equation correlating the surface and the direction field. We focus on examples motivated by the physics of interfaces in liquid crys…
Monodisperse spherical and mesoporous Eu-doped TiO2 phosphor particles were prepared by nonionic surfactant-assisted soft-chemistry method. It is shown that the phosphor particles possess submicron diameter of about 250nm and narrow size distribution. Under ultraviolet irradiation the particles show characteristic lum…
Individually isolated single-walled carbon nanotubes (SWNTs) are coated with a monolayer of cationic surfactant to improve the stability of their dispersions in water. After polymerizing the counterions of the surfactant, the monolayer coating is “locked in” (see figure), and the SWNTs are redispersible even after har…
CdCNi 3 is a newly synthesized superconductor with T c =2.5–3.2 K. The crystal has the same perovskite-type structure as MgCNi 3 but the lattice constant is ∼1% larger than that of MgCNi 3 . For this material, superconducting parameters, lower critical field H c1 (0), upper critical field H c2 (0), coherence length ξ(…