Materials Literature
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In superlattices made of a half metallic ferromagnet La2/3Ba1/3MnO3(LBMO) and a metallic paramagnet LaNiO3(LNO), the field dependence of the LBMO magnetization was studied using depth- and element-sensitive x-ray resonant magnetic scattering measurements. The superlattices have ten bilayers of LBMO and LNO, and the LB…
The higher-order component in liquid crystal (LC) surface free energy beyond the Rapini–Papoular anchoring potential was examined for azimuthal anchoring by analyzing nematic LC alignment on nanogrooved surfaces treated by rubbing or photoalignment. We confirmed that the surface anchoring energy for large director dev…
Nanostructured WO 3 arrays fabricated by tungsten hot-filament chemical vapor deposition in an oxygen/argon gas mixture were studied in order to develop field-emission materials. Nanostructured WO 3 arrays of different shapes were grown by controlling the substrate temperature and the distance from the hot filament. W…
Symmetrical four-chained (tetracatenar) di-hydrazine derivatives, namely oxalyl N',N'-bis(3,4-dialkoxybenzoyl)-hydrazide (BFH-n, n = 4, 6, 8, 10), were synthesised. Investigations on the liquid crystalline properties by differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD) and polarising optical…
Molecules containing a terphenylene core, two alkyl chains and a pyridinium ring associated with its bromine counterion were synthesised and their liquid crystalline properties were studied by differential scanning calorimetry, polarising optical microscopy and X-ray diffraction. The results were compared with those o…
The combined effects of applied electric field and axial compressive stress on the strain behavior of [011]-poled Pb(Mg1/3Nb2/3)O3–(28–32)%PbTiO3 [PMN-(28–32)%PT] single crystals of [011¯]-length cut have been investigated. For this crystal cut, the axial compressive stress has little effect on the R-O transformation…
The dissolution of iron and tin from tinplate cans filled with tomato purée (pH 4.34) and dioctyl sebacate oil (DOS), essential onion oil (EOO) or potassium nitrate was studied using atomic absorption spectroscopy (AAS), while nitrate was determined using high-performance liquid chromatography (HPLC). The maximum valu…
In this work an interface is studied and proposed for chemical vapour deposition (CVD) diamond films on sintered carbides and steel substrates, the most relevant tooling materials for mechanical applications. It consists of a thermoreactive deposited and diffused vanadium carbide layer. This interface presents good ch…
New thermotropic liquid crystals containing a long alkoxysemiperfluorinated chain (-O-(CH2)3-(CF2)7-CF3), one linking unit in mesogenic cores (HC=N-) and different functional end-groups such as 4-hexadecyl-, 4-n-hexadecyloxy- chain, or biphenyl-4-carbonitrile, 4-diazenyl-N,N-dimethylbenzene or pyren were synthesized v…
This letter demonstrates the role of film geometry on the phase transformation and shape memory behaviors of NiTi thin films. Lithographically patterned lines possess a strain profile that significantly alters their phase transformation behavior and surface morphology in comparison to continuous films, although the mi…
Quasicrystalline phase formation during heat treatment in the mechanically alloyed Al 65 Cu 20 Fe 15 powders was studied by X-ray diffraction (XRD) and differential scanning calorimeter (DSC). The mechanical alloying was performed at speed of 300 rev min –1 for times up to 70 h. It was found that mechanical alloying o…
Carbon based bottom gate thin film transistors were fabricated using pulsed laser deposited amorphous carbon (a-C) and amorphous carbon nitride (a-CNx) films. Both series of devices show p-type conduction in the active channel at high electric fields, for which the conduction mechanism may be fitted to Poole–Frenkel t…
A series of heterocyclic liquid crystalline compounds containing 1,3,4-oxadiazole/thiadiazole, furan and thiophene units were synthesised and characterised by means of electrospray ionisation-mass spectrometry (ESI-MS), high-resolution mass spectroscopy (HRMS), 1H nuclear magnetic resonance (NMR) and 13C NMR. The ther…
Epitaxial perovskite-type films of sodium niobate were grown by pulsed laser deposition, and their crystal structure and dielectric properties were experimentally studied. The dielectric permittivity, inverse permittivity and its derivative, and dielectric hysteresis were analyzed and compared with those of antiferroe…
Amorphous Spherical Carbon with Nitrogen (SCN) active carbon has been prepared by carbonization of poly(vinylpyridine-divinylbenzene) (PVPDVB) copolymer. The PVPDVB dehydrogenation copolymer has been quantum chemically (QC) simulated using cluster and periodic models. Scanning electron microscopy (SEM), transmission e…
We present a flexible electronic material fabricated by incorporating multiwall carbon nanotubes (MWNTs) into poly(dimethylsiloxane) rubber (0.35 wt % MWNT loading is most appropriate in our study). Resistance-temperature data for different composites (0.35–5 wt %) are analyzed within Coulomb gap variable range hoppin…
The synthesis and liquid crystalline properties of some new multisubstituted triphenylenes are reported. The materials bear combinations of alkyne and alkoxy substituents and were designed to probe the structural factors controlling mesophase formation, type and stability in triphenylene discotics. A combination of fa…
Monochromated low-loss EELS (electron energy-loss spectroscopy) is explored as an analytical technique for nanoscale mapping of the electronic band gap energy on arsenic-implanted ZnO, CdZnO, and InGaN compounds. Its accuracy is confirmed independently with Raman spectroscopy. From a ternary compound, the relationship…
Silicon nanocrystals embedded in a lattice-matched Gd2O3 matrix exhibit large size-dependent bandgap widening. Measurements of photocharging spectra of these crystals indicate only a marginal variation in the photoionization threshold energy. The latter suggests that most of the confinement-induced bandgap width varia…
The thermal and optical properties of two series of unsymmetrical liquid crystalline compounds based on an isoxazole ring are described. Of these materials, 3–7 and 8–12 displayed strong absorption at 285 nm and a weak blue fluorescence in solution at around 377 nm, even with the presence of a high conjugated core. Th…