Materials Literature
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The investigation of Zn substitution in MgB2 polycrystalline samples shows that about 0.1 Zn can be substituted in the structure of Mg deficient samples while it can not be substituted in stoichiometric MgB2. As a result of the isovalent Zn substitution into the Mg position of Mg deficient samples the a and c lattice…
In our previous paper (Eur. Phys. J. E 4, 121 (2001)) we proposed a coarse-grained elastic energy for nacre, or stratified structure of hard and soft layers. We then analyzed a crack running perpendicular to the layers and suggested one possible reason for the enhanced toughness of this substance. In the present paper…
Necking or cold drawing is a smoothed jump in cross-sectional area of long and thin bars (filaments orfilms) propagating with a constant speed. The necks in polymers, first observed about seventy years ago, arenow commonly used in modern processing of polymer films and fibers. Yet till recently there was a lack infund…
Mesoporous Ti-SBA-15 has been postsynthesized by the titanation of pure silica SBA-15 in glycerol with the assistance of quaternary organic ammonium hydroxides, and has been extensively characterized by various techniques to investigate the mesostructural and catalytic properties, and the chemical nature of the incorp…
The confinement of crystallizable blocks within AB or ABC microphase-separated block copolymers in the nanoscopic scale can be tailored by adequate choice of composition, molecular weight, and chemical structure. In this work we have examined the crystallization behavior of a series of AB and ABC block copolymers inco…
alpha-MnO2 single-crystal nanorods with diameters 20-80 nm and lengths up to 6 microns have been prepared through a low-temperature liquid-phase comproportionation method, which involves no catalysts or templates and may be adjusted to prepare alpha-MnO2 single-crystal nanorods in large scale.
Microspherical mercury ion adsorbents with uniform mesopore channels were prepared by fluoride-catalyzed surfactant-directed co-condensation of tetraethoxysilane (TEOS) and 3-mercaptopropyltrimethoxysilane (MPTMS) using mildly acidic nonionic surfactant solutions. Using batch adsorption methods, mercury(II) adsorption…
By combining a previously developed model of droplet spreading with simple equations to describe liquid penetration, we develop a versatile new model that successfully describes the spreading and imbibition of liquid droplets on porous surfaces. The model is experimentally verified for a range of porous membranes and…
Overlayers on surfaces with square symmetry exhibit a huge variety of strain relief mechanisms. I present a simple 2D Frenkel-Kontorova model and calculate the associated zero temperature phase diagram which shows a transition from overlayers with square symmetry (and possible square dislocation patterns) to hexagonal…
A driving mechanism for a twisted nematic liquid crystal device that could possibly improve the viewing-angle characteristics and the cell gap error margin is proposed. It is important that the surface azimuthal anchoring strength of the liquid crystal cell differs at the upper and lower substrates, unlike a conventio…
Abstract In this article, the polydispersity of the ethylene sequence length (ESL) in ethylene/α‐olefin copolymers was studied by atomic force microscopy (AFM) and the thermal‐fractionation technique. The crystal morphology observation by AFM showed that morphology changed gradually with decreasing average ESL from co…
We investigate the dynamical spin-spin autocorrelation function of the isotropic high-spin molecules ${\mathrm{CrCu}}_{6}(S=9/2),$ ${\mathrm{CrNi}}_{6}(S=15/2),$ and ${\mathrm{CrMn}}_{6}(S=27/2),$ using magnetization, spin-lattice relaxation of muon spin (\ensuremath{\mu}SR), and NMR measurements. We find that the fie…
Reactions of (PyH)2[MoOCl5] and (PyH)[MoOBr4] with alcohols in the presence of tetramethylpyrazine have inadvertently resulted in a series of tetranuclear polyoxoalkoxymolybdates(V) with the general formula (PyH)2[Mo4O8(OR)2(HOR)2X4] (1a: R = Me, X = Cl; 1b: R = Et, X = Cl; 1c: R = Et, X = Br). Reaction with the nitro…
Correlation of the surface molecular composition with the nanoscale elastic behavior and topography of stretched polyurethane films was examined by surface-specific techniques, such as sum frequency generation (SFG) vibrational spectroscopy and atomic force microscopy (AFM). Identification of the SFG spectra of the so…
Abstract In this article, a study of the thermal behavior of polyaniline films and polyaniline–polystyrene blends is presented. Transport measurements (electrical conductivity and thermoelectric power) at high temperature and thermogravimetric analysis show that an irreversible degradation is observed near 450 K for f…
Persistent photoconductivity has been observed in a perovskite manganite doped with an alkali metal element, ${\mathrm{Pr}}_{0.75}{\mathrm{Na}}_{0.25}{\mathrm{MnO}}_{3}.$ Considering the shallow penetration depth $(\ensuremath{\sim}0.1\ensuremath{\mu}\mathrm{m})$ of visible light, the increase of the conductance is es…
Thermal conductance G, thermal capacitance H, and the time constant τ are major parameters to be determined in the design of bolometer devices and, therefore, it is an important task to evaluate these thermal parameters experimentally for design verification. In this work, a technique has been developed to determine t…
A simple and general technique for producing a suspended nanofiber has been developed using coordinate markers and a sacrificial layer of poly(methylmethacrylate). The simple procedure does not involve etching processes or chemical vapor deposition and makes it easier to investigate the physical properties of nanofibe…
In this letter, we present the results of the fabrication and characterization of 5 mol % MgO doped Ba0.7Sr0.3TiO3 (BST) films grown on Pt/TiN/SiO2 coated on Al2O3 substrates using the rf magnetron sputtering technique. The dielectric and electrical properties of Ba0.7Sr0.3TiO3 thin film were found to improve obviousl…
Abstract The initiation of the electrochemical growth of polythiophene thin films was studied by X‐ray photoelectron spectroscopy (XPS), electron probe micro analysis (EPMA), and mainly by scanning electron microscopy (SEM). The films were deposited on SnO 2 ‐coated glass in a classical three‐electrode cell. Depositio…