Materials Literature
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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…
A self-assembly approach to the preparation of nanocomposite siliceous thin films by using oligosilsesquioxanes as building blocks is presented. Poly(styrene-4-sulfonate), PSS, and octa(3-aminopropyl)silsesquioxane, NSi8, were layer-by-layer (LbL) assembled onto planar substrates and polystyrene (PS) particles, thus f…
Abstract A new bis( o ‐aminophenol) with a crank and twisted noncoplanar structure and ether linkages, 2,2′‐bis(4‐amino‐3‐hydroxyphenoxy)biphenyl, was synthesized by the reaction of 2‐benzyloxy‐4‐fluoronitrobenzene with biphenyl‐2,2′‐diol, followed by reduction. Biphenyl‐2,2′‐diyl‐containing aromatic poly(ether benzox…
The oxidative polymerization of tris(thienylphenyl)amine derivatives was performed in acetonitrile by electrochemical and chemical methods. Oligomers were synthesized by stepwise coupling using coupling reactions. The polymer prepared using the trifunctional monomer on a Pt electrode showed significantly better redox…
Phenylene-1,3-dithiol is converted into a trinuclear gold complex by treatment with 1 equiv of [[(Ph(3)P)Au](3)O](+)BF(4)(-). In the product, the phenylene unit bears one gold thiolate and one di(gold)sulfonium function. These components aggregate into one-dimensional arrays through head-to-tail aurophilic contacts be…
Abstract Polystyrene‐modified natural rubber (SNR) was prepared in the laboratory and subsequently used as compatibilizer in polypropylene/natural rubber (PP/NR) blends. The effect of SNR (at 5%, 10%, 15% and 20% by volume) in PP/NR (70/30) blend was studied by maintaining the rubber volume while PP volume was replace…
A method which preferentially produces adjacently di-aromatic ring-substituted tetraazaporphyrins (TAPs) has been developed, and their electrochemical and spectroscopic properties have been studied and compared with those of the corresponding series of mono-aromatic ring-fused TAPs. Mono-aromatic ring-fused TAPs show…
By using spin-polarized full potential linearized augmented plane wave method we obtained the electronic structure of (Ga,Mn)As crystals with Mn in substitutional, interstitial, and both positions. It is shown that the interstitial Mn acts as a double donor and compensates the holes created by two Mn atoms in substitu…
Abstract The 1:1 stoichiometric salt monomer composed of squaric acid and bis(4‐aminophenyl) ether was successfully prepared and subjected to solid‐state thermal polycondensation under ordinary or high pressure, giving quite readily the aromatic polysquaramide with moderately high molecular weight. The polysquaramide…
The coordination properties of the new polynucleating ligand H(3)L1 (1,3-bis(3-oxo-3-phenylpropionyl)-2-hydroxy-5-methylbenzene) with Mn(II/III) are described. Depending on the solvent used, the reaction of H(3)L1 with Mn(OAc)(2) yields either of the two new multinuclear assemblies [Mn(2)(HL1)(2)(py)(4)] (1) and [Mn(3…
Successful photoalignment of a mesostructured inorganic material synthesized through supramolecular templating of surfactants is performed via hierarchically relayed multiple transfer among heterointerfaces. The directional information possessed by linearly polarized light is initially captured by a latent photochromi…
We performed the single-crystal ${}^{13}\mathrm{C}$ NMR studies on a quasi-two-dimensional system, deuterated $\ensuremath{\kappa}\ensuremath{-}(\mathrm{BEDT}\ensuremath{-}\mathrm{TTF}{)}_{2}\mathrm{Cu}[\mathrm{N}(\mathrm{CN}{)}_{2}]\mathrm{Br}$, which is just on the border of the Mott transition. The NMR spectra are…