Materials Literature
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Abstract The [2+2] compartmental macrocyclic complexes [Ln(H2‐L)(NO3)], where H2‐L is the cyclic Schiff base, derived from the condensation of 2,6‐diformyl‐4‐chlorophenol (H‐LA) or 2,6‐diformyl‐4‐methylphenol (H‐LB) and N,N‐bis(2‐aminoethyl)‐2‐hydroxybenzylamine·3HCl (HA′·3HCl), contains a free N3O3 coordination chamb…
Cholesteric droplets accompanied by a topological defect are studied in free standing smectic C;{ *} films. We observed a transition between two droplet-defect configurations with the defect in the film and on the droplet boundary. We found that the distance between the droplet surface and the topological defect decre…
Nanostructured ZnO was prepared by pyrolysis of single source precursors, ZnCl2(benzsczH)2 and ZnCl2(cinnamsczH)2 (where, benzsczH = benzaldehyde semicarbazone and cinnamsczH = cinnamaldehyde semicarbazone). Powder X-ray diffraction pattern (PXRD) shows formation of hexagonal ZnO. The peak broadening in PXRD and absor…
Nonpolar a -plane ZnO films were deposited for the first time on nearly lattice-matched a -plane GaN templates using an in situ SiN x interlayer by the pulsed laser deposition method. The symmetric and asymmetric reciprocal space mappings reveal the broadening effects of the reciprocal lattice points and the residual…
Abstract In aqueous media, the MnIV trimer [MnIV3(μ‐O)4(phen)4(H2O)2]4+ (1, phen = 1,10‐phenanthroline) equilibrates with its deprotonated from [Mn3(μ‐O)4(phen)4(H2O)(OH)]3+ (2). Among the several synthetic multinuclear oxo‐ and/or carboxylato‐bridged manganese complexes known to date containing metal‐bound water, to…
The interaction between aromatic rings is a fundamental problem in material science and biochemistry. These interactions are generally found to stabilise protein molecules and the double helical structure of DNA, and they also play an important role in the recognition processes in biological and non-biological systems…
The freezing of colloidal silica sols — a process known as freeze-gelation, or freeze-casting — offers a route for the manufacture of low-cost ceramics of complex shape which is a useful alternative to conventional ceramic manufacturing methods. Freeze-gelation, unlike the more conventional alkoxide or colloidal sol-g…
We present two different theories for Raman scattering and resonant inelastic x-ray scattering (RIXS) in the low-temperature ferromagnetic phase of ${\text{YTiO}}_{3}$ and compare this to the available experimental data. For description of the orbital ground state and orbital excitations, we consider two models corres…
A novel tris(2-pyridylmethyl)amine (TPA) derivate having two catechol moieties linked by amide linkages at the 6-positions of two pyridyl groups was synthesized. The ligand, N,N-bis[6-{3,4-(dihydroxy)benzamide}-2-pyridyl-methyl]-N-(2-pyridylmethyl)amine (Cat(2)-TPA; L2), and its precursor, N,N-bis[6-{3,4-bis(benzyloxy…
Abstract We synthesized 1,4‐dipropyltetracene on a 200‐mg scale, the key step of which involved a Diels–Alder reaction between alkyl‐substituted o‐quinodimethane, generated in situ, and 1,4‐naphthoquinone. The product was obtained as an orange solid, which was soluble in organic solvents including hexane. The optical…
Homogeneous and stable amorphous-type yttrium aluminum garnet (YAG) and cordierite powders were prepared by a solution-polymerization route, employing PVA solution as a polymeric carrier. Porous and soft powders were obtained after calcination of aerated precursors. The calcined powder showed a very low residual carbo…
Reduction of NOx emissions and increased engine performance could be achieved using uncooled or back-cooled ceramic combustor chambers. For oxidation and temperature stability purposes, single crystal oxide fiber-based composites would be most desirable. To assess such a far-reaching technology, unidirectional and cro…
In the title complex, [Cu(N(3))(2)(C(3)H(10)N(2))(2)], the Cu(II) ion resides on a centre of symmetry and is in a Jahn-Teller distorted octa-hedral coordination environment comprising two N atoms from azide anions in axial positions and four N atoms from propane-1,3-diamine (tn) ligands in equatorial positions. Inter-…
Electrodeposition of zinc on steel was obtained from an acid sulphate bath containing condensation product (CP) formed between lysine and salicylaldehyde. The bath constituents and operating conditions were standardized by Hull cell experiments. Influence of experimental parameters on current efficiency was investigat…
Abstract A novel silicon‐containing resin (ESA resin) was successfully synthesized by the condensation reaction of lithium arylacetylide with chlorosilane in high yields. The resin was characterized by the techniques of FTIR, 1H‐NMR, 29Si‐NMR, and gel permeation chromatography. Thermal cure process was monitored by DS…
A unique nanoscale ring-shape pattern of fluorocarbon macromolecules grown during SiO2 reactive ion etching (RIE) is presented. This pattern was discovered after SiO2 RIE using trifluoromethane (CHF3) and oxygen. Typical dimensions of the ring-type fluorocarbon structure are found to be approximately 50 nm in diameter…
An Anderson-type hexamolybdochromate(III) is found to be an effective catalyst for the selective oxidation of sulfides to their corresponding sulfones. The reaction was carried out in 60% aq. acetonitrile (v/v) using 30% H2O2 at 60°C. Various dialkyl, alkyl-aryl, and diaryl sulfides were selectively oxidized, giving h…
The reaction pathways for the gallium nitride GaN growth by gas phase reaction of trimethylgallium (TMG) with ammonia is studied theoretically. Water is the most important impurity in ammonia, therefore its reaction with TMG is investigated as a possible source of oxygen impurity in GaN. Gallium oxide (GaO) formed by…
Bottom-gate thin film transistors (TFTs) with a ZnMgO film as the channel layer were fabricated on thermally oxidized p-type silicon substrates by laser molecular beam epitaxy. The devices exhibit good electrical properties in dark with the current on/off ratio, threshold voltage and channel mobility of 10 5 , 6 V and…
In this work, a hybrid chromatography−crystallization separation process is suggested and is used to isolate and purify the antimalarial drug artemisinin from the Chinese medicinal herb Artemisia annua . Extraction of the aerial parts of A. annua by an organic solvent yielded a complex mixture of natural products. A h…