Materials Literature
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Self-supporting carbon films were prepared from a carbonaceous material, nanohorns. Nanohorns are spherical particles built of sharp cones of a single graphene sheet. The films show good field emission characteristics due to the sharp horn-like structures, in particular a low turn-on field and good long-term stability.
Members of the Sso7d/Sac7d family are small, abundant, non-specific DNA-binding proteins of the hyperthermophilic Archaea SULFOLOBUS: Crystal structures of these proteins in complex with oligonucleotides showed that they induce changes in the helical twist and marked DNA bending. On this basis they have been suggested…
Transparent diamond films with a crystallite size well controlled below 70 nm were grown by hydrogen and methane microwave plasma-enhanced chemical vapor deposition on quartz glass substrates, which had been scratched with 0.5 μm diamond powder. A complementary set of analyzing tools was employed to study the microstr…
Magneto-optical transitions in CoFe2O4 and NiFe2O4 spinel ferrites are investigated in comparison with those in isostructural Fe3O4. The Kerr angle and ellipticity of the ferrites have been measured by magneto-optic Kerr effect (MOKE) spectroscopy in the 1.5–5 eV region. The results indicate that the d–d intervalence…
Ferroelectric phase transformation characteristics of ceramic BaTiO3 have been studied by combined thermo-Raman and dielectric measurements. The temperature dependence of Raman bands at 311 and 721 cm−1 shows that tetragonal to cubic (T–C) phase transformation occurs over a range of temperature. The increase in the ba…
We present calculations on the physical properties of Ti4AlN3 obtained from first principles, as well as some general observations concerning this group of materials. We further report mechanical data obtained through numerical simulations for some representative phases, and elaborate on the issue of high pressure sta…
La 0.7 Ca 0.3 MnO 3 films with thicknesses between 2 and 300 nm were fabricated on LaAlO3, SrTiO3, and (LaAlO3)0.3(Sr2AlTaO6)0.7 (LSAT) substrates using pulsed laser deposition. After annealing at 950 °C in flowing oxygen, on LaAlO3 and LSAT, strain-relaxed epitaxial films of high quality were obtained. The magnetizat…
Carbon nanocoils were prepared by catalytic pyrolysis of acetylene using iron-coated indium tin oxide as the catalyst. The effects of the constitution of catalyst, the growth temperature and time, the flow rate of acetylene gas on the growth of carbon nanocoils were investigated. It is found that the coils grow mainly…
Single crystals of lithium selenoindate (LiInSe2) are grown by the Bridgman–Stockbarger technique up to sizes of 10 mm in diameter and 20 mm in length. The different phases have color from yellow (as grown) to dark red (after annealing) but all have the same wurtzite type structure mm2 with slightly differing cell par…
CuIn 1−x Al x Se 2 thin films are investigated for their application as the absorber layer material for high efficiency solar cells. Single-phase CuIn1−xAlxSe2 films were deposited by four source elemental evaporation with a composition range of 0⩽x⩽0.6. All these films demonstrate a normalized subband gap transmissio…
From magnetic, dielectric and magnetoelectric measurement, it is concluded that hexagonal HoMnO 3 , ErMnO 3 and YbMnO 3 undergo a magnetic phase transition at a low temperature where a magnetic long-range order of rare earth ions is established. Possible magnetic structures are estimated from the experimental results…
A phenomenological theory of magnetic states in noncentrosymmetric tetragonal antiferromagnets is developed, which has to include homogeneous and inhomogeneous terms (Lifshitz-invariants) derived from Dzyaloshinskii-Moriya couplings. Magnetic properties of this class of antiferromagnets with low crystal symmetry are d…
We report the effect of progressive reduction of the annealing temperature on the magnetocaloric effect (MCE) of La2/3Ca1/3MnO3−δ nanoparticles synthesized by the sol–gel technique. With this method, we are able to obtain particle diameters ranging form 60 to 500 nm. The peak in the MCE at the ferromagnetic to paramag…
Peer reviewed: No
The thermal conductivity of SiO2 thin films prepared using various procedures has been studied using a 3ω method. The thermal conductivity of SiO2 thin films of above approximately 500 nm thickness decreases as the porosity of the specimen, which is determined by infrared absorption spectroscopy, increases. Below appr…
Hydrothermally prepared β-MnTe2O5 is isostructural with MgTe2O5. It contains infinite layers of corner-sharing TeO3+1 groups propagating in the ac plane. Infinite chains of edge-sharing MnO6 octahedra [dav(Mn—O) = 2.186 (2) Å] running along [001] link the Te/O layers into a continuous structure. Mn and one O atom hav…
Mesoporous SBA-15 materials have been synthesized with different pore sizes and characterized by X-ray diffraction, N 2 adsorption isotherms, X-ray fluorescence and thermal gravimetric analysis. SBA-15 has been aluminated by grafting AlCl 3 to SBA-15 in the presence of ethanol. Cupric ions have been introduced into th…
We report the synthesis, electrochemical and optical properties of novel 1,3-bis(5-diarylaminothiophen-2-yl)isothianaphthenes obtained by palladium-catalysed amination of 1,3-bis(5-bromothiophen-2-yl)isothianaphthene with diarylamines.
Hydrolytic condensation of N -(6-aminohexyl)aminopropyltrimethoxysilane (AHAPS) in water results in the formation of spherical colloids measuring 40 to 190 nm in diameter and composed of a nearly fully condensed poly(aminohexyl)(aminopropyl)silsesquioxane (PAHAPS) nanostructure containing C−SiO 3/2 species. Interactio…
Novel side chain dendritic aromatic−aliphatic polyethers are synthesized from aromatic terphenyl diols, disubstituted with Fréchet-type dendrons of the first and second generation and aliphatic dibromides of various lengths. High-molecular-weight soluble polymers were obtained in all cases. The bulk properties of the…