Materials Literature
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New hybrid nanocomposites based on a methacrylate functionalized titanium-oxo cluster as nano-cross-linker show improved mechanical properties, optical transparency and photochromic activity.
Abstract Natural hokutolite, (Ba,Pb)SO 4 , is a radioactive sulfate mineral occurring in hot-spring deposit. Unlike the limited PbSO 4 content observed in natural specimens, the present study reveals that (Ba,Pb)SO 4 crystals can be grown with compositions covering the whole solid solution series of PbSO 4 and BaSO 4…
Ordered mesoporous silicas with large-pore diameters incorporating aminopropyl groups in variable quantity have been synthesized via the co-condensation of tetraethyl orthosilicate (TEOS) and 3-tert-butyloxycarbonylaminopropyltriethoxysilane templated with nonionic surfactant P123 under acidic conditions. The deprotec…
Copper(II)- and iron(III)-modified Pb[Zr(x)Ti(1-x)]O3 ferroelectrics were investigated by means of high-field/high-frequency EPR. The results obtained suggest that Cu2+ and Fe3+ both substitute as acceptor centers for [Zr,Ti]4+. Whereas for the iron-doped system the charge compensating oxygen vacancies (V(O)**) lead t…
In this work we demonstrate the self-assembly of beta-D glucose-protected Pt nanocrystals (average particle size = 4.1 nm) into nanowire-like assemblies under ambient conditions.
By treatment of N-fused tetraphenylporphyrin rhenium(I) tricarbonyl complex with trimethylamine N-oxide, oxidation of the metal center proceeded to afford N-fused tetraphenylporphyrin rhenium(VII) trioxo complex, which was quite stable against air, light and heat.
Crystallisation of zinc(tetra(4-pyridyl)porphyrin) [Zn(tpyp)] from a CHCl3/MeOH solution affords single crystals of a new supramolecular isomer of [Zn(tpyp)]∞, which adopts a polymeric ribbon structure in which a central six-coordinate Zn centre is linked to two five-coordinate Zn cations linking the [Zn(tpyp)] units…
Highly ordered mixed framework mesoporous cubic (Im3m) or 2D hexagonal (p6m) thin films of (M1−x(Si–R)x)O2−x/2 bearing organic groups (M = Ti or Zr, R = propylamine, mercaptopropyl or phenyl, x ≤ 0.2) are obtained by one-pot dip-coating. A second organic function (R′ = hexadecyl, phenyl, sulfonate…) can be added by po…
When organic materials are placed in environments which physically confine the materials at the nanometre scale, interfacial effects and confinement-induced loss of entropy can significantly alter materials' properties such as the glass transition temperature as well as the nanoscale morphology as compared to a "free"…
Non-volatile memories (NVM) are playing an important role in the semiconductor market, thanks in particular to flash which is used mainly in cellular phones and other types of electronic portable equipment. In the coming years portable systems will demand even more NVM with high density and very high writing throughpu…
Low-dimensional nanostructured materials are promising candidates for high efficiency solid-state cooling devices based on the Peltier effect. Thermal transport in these low-dimensional materials is a key factor for device performance since the thermoelectric figure of merit is inversely proportional to thermal conduc…
In order to exhibit good all-round performance the impact toughness enhancement of as-cast high-speed steels is obligatorily needed. In general, different methods are used commercially to achieve cast structure refinement and, as a consequence, their properties are improved. Introduction into the melt of inoculant par…
A prototype of an electronically tunable impedance matching network in "T "-configuration at 1.95 GHz has been realized with discrete ferroelectric varactors of Barium-Strontium-Titanate Ba/sub 0.6/ Sr/sub 0.4/TiO/sub 3/ (BST). The tunable load impedance range has been analyzed in dependency of tuning voltage. For a 5…
The structure of a novel metallamacrocyclic phosphine gold(I) thiolate cluster, [Au9(mu-dppm)4(mu-p-tc)6](PF6)3, where dppm = bis(diphenylphosphine)methane and p-tc = p-thiocresolate, is reported and shows AuAu attractions of approximately 3.0 A and gold(I) atoms linked to thiolate and phosphine ligands in distorted t…
We present a method to numerically calculate a non-reflecting boundary condition which is applicable to atomistic, continuum and coupled multiscale atomistic/continuum simulations. The method is based on the assumption that the forces near the domain boundary can be well represented as a linear function of the displac…
Epoxy/alumina nanocomposites were newly prepared by dispersing 3, 5, and 7 weight % nano-scale boehmite alumina particles in a bisphenol-A epoxy resin. Dispersion of alumina particles in the nanocomposite specimen was observed by scanning electron microscopy (SEM). Flexural properties, dynamic viscoelasticity, permitt…
The partial pressure of NH3 gas estimated by Raman spectroscopy indicates that approximately 0.1% NH3 inevitably contaminates the H2 desorbed from a hydrogen storage material composed of LiH and LiNH2 at any temperature up to 400 degrees C in a closed system.
In this paper, the onset voltage of negative corona is theoretically predicted for point-cup gaps positioned in air. The method of calculation is based on the criterion developed for the formation of repetitive negative corona Trichel pulses. Field distributions are determined through charge simulation method coupled…
We have successfully developed a new one-pot solution-phase route, namely microwave-assisted hydrothermal reduction/carbonization (MAHRC), for a rapid synthesis of coaxial Ag/C nanocables. The nanocables can self-assemble in situ in an end-to-end fashion into interconnected chains.
Several different compositions of tellurium-thallium oxide glasses were fabricated and tested for their Raman gain performance. The addition of PbO to the glass matrix increased the surface optical damage threshold by 60-230%. The maximum material Raman gain coefficient experimentally obtained was (58 +/- 3) times hig…