Materials Literature
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The heterogeneous phase equilibria in the rhenium-oxygen system (over a composition range of Re2O7-Re) were studied using differential thermal analysis, x-ray diffraction analysis, and tensimetry. The system was found to contain the equilibrium phases of Re2O7, cubic ReO3, and orthorhombic ReO2. A region of homogeneit…
Abstract Composites of linear low‐density poly(ethylene‐ co ‐butene) (PE) or maleated linear low‐density poly (ethylene‐ co ‐butene) (M‐PE) and cellulose (CEL), cellulose acetate (CA), cellulose acetate propionate (CAP), or cellulose acetate butyrate (CAB) were prepared in an internal laboratory mixer with 20 wt % pol…
Magnetoelectric Aurivillius phase Bi6Ti3Fe2O18 is obtained by molten salts synthesis (MSS). A description of the experimental conditions for preparing the compound is given. Scanning electron microscopy observation reveals that obtained crystallites show plate-like shape, with small size dispersion. MSS allows efficie…
Abstract The structural, morphological and optical properties of vacuum‐evaporated CdSe thin films were investigated as a function of the substrate temperature and the post‐deposition annealing conditions. It was observed that the grain sizes and morphologies of as‐deposited layers were similar for substrate temperatu…
A substitution-reaction route has been demonstrated as an efficient synthesis route for producing single-walled and multiwalled B10N nanotubes (BNNTs). The nanotubes have diameters smaller than those of the starting carbon nanotubes and also have similar lengths to the starting carbon nanotubes. The isotopic ratio of…
Abstract Nanocomposite powders from polypropylene filled with surface modified and unmodified fumed silica have been prepared from polymer solution to achieve improved mixing and have been forwarded to fiber melt spinning. The surface of the fumed silica was modified with dodecyl alkoxy silanes. Crystallization veloci…
Abstract We present a comparative structural–vibrational study of nanostructured systems of V 2 O 5 : nano‐urchin (VONURs) which are spherical structures composed of a radially oriented array of VOx nanotubes (VOx‐NTs) with a volumetric density of ∼40 sr –1 , and vanadium oxide nanorods (VOx‐NRDs) with an average leng…
Amphoteric dopants are widely used in BaTiO3-based dielectrics to improve capacitor reliability. In this work, an analogous approach was explored for barium strontium titanate thin films. Ba0.7Sr0.3TiO3 thin films were prepared by chemical solution deposition. Er was used as a dopant to decrease the leakage current an…
Abstract We report new results on the electron spin resonance of single walled carbon nanotubes, peapods and double walled carbon nanotubes. A small ESR line is present in well purified samples and its temperature dependence reveals a striking ‘super‐Curie’ paramagnetic rise. In addition, we identify a narrower line i…
Abstract Summary: Novel hyperbranched polyphenylenes based on both an A 2 + B 3 and an AB 2 + AB approach were synthesised and characterised. Different monomers were prepared and polymerised using a Diels‐Alder reaction with subsequent decarbonylation. The polymer backbones consist of hexaphenylbenzene units which are…
Abstract We analyzed structural changes and clearly revealed position and character of newly attached, sulfur containing, functional groups. Multi‐walled carbon nanotubes (MWCNTs) have been first exposed to harsh acid treatment to induce defects and oxygen containing hydroxyl and carboxyl groups. Such tubes were image…
Sintered HgTe nanocrystal-based thin-film transistors (TFTs) with bottom- and top-gate geometries were fabricated at a temperature of 150°C by spin coating in this work. The SiO2 bottom- and Al2O3 top-gate field-effect TFTs with p channels composed of sintered HgTe nanocrystals exhibit high carrier mobilities of 0.82…
The authors report the effect of ultraviolet (UV) illumination on optical properties of single-wall carbon nanotubes (SWCNTs) isolated using various dispersants. It is demonstrated that even weak UV light (∼1mW∕cm2) can irreversibly alter the SWCNT structure, thus resulting in the emergence of hitherto unknown, redshi…
Magnetic mechanisms for the (Co,Al)-codoped ZnO, based on the first-principles calculations, are evaluated. Additional electrons induced by Al doping can stabilize the ferromagnetic state in Co-doped ZnO. The Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction may be the dominant mechanism when the distance between Co an…
Abstract Wood scantlings were coated with polyaniline (PANI) during the in situ polymerization of aniline with ammonium peroxydisulfate in an aqueous medium. The coating was made in hydrochloric or phosphoric acid solutions in both the absence and presence of stabilizers, poly( N ‐vinylpyrrolidone) or colloidal silica…
Abstract Applications of single‐wall carbon nanotubes (SWNT) are severely restricted, as they exist in rope‐like bundles. Many methods have been suggested to de‐bundle SWNTs, including both covalent and non‐covalent funtionalisation with surfactants, acids, polymers and macromolecules. However, these strategies are un…
The authors have studied the effects of pressure on the magnetocaloric effect in a polycrystalline LaFe11.6Si1.4 sample. The Curie temperature TC of the sample rapidly decreases from 191K at ambient pressure to 80K under 8.3kbar pressure. The metamagnetic transition induced by field at temperatures above TC becomes ex…
The authors report on an alignment layerless (AL) flexible liquid crystal (LC) display fabricated at ambient temperature through an imprinting process. One-dimensional microgrooves and two-dimensional arrays of microstructures embossed on plastic substrates provide the spontaneous alignment of the LC molecules and spa…
Abstract The influence of multiple extrusion cycles on the behavior of natural fibers‐reinforced polypropylene was studied. Composites were fabricated with 20 wt % of flax fibers. Final fibers dimensions (length and diameter) were measured by means of optical microscopy. Mechanical properties of matrix and composites…
The electronic spectrum of a two-dimensional square lattice in a perpendicular magnetic field has become known as the Hofstadter butterfly [Hofstadter, Phys. Rev. B 14, 2239 (1976).]. We have calculated quasi-one-dimensional analogs of the Hofstadter butterfly for carbon nanotubes (CNTs). For the case of single-wall C…