Materials Literature
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Nanowire and nanotube arrays of transition metal were produced by potentiostatic electrochemical deposition using a polycarbonate membrane filter template (15 to 200 nm in nanopore diameter). Nanotubes are produced by appropriately controlled partial filling of the pore cross section; nanowires result when the filter…
Pyrolysis of poly(vinyl chloride) (PVC) and poly(vinylidene chloride) (PVDC) mixed with poly(ethylene) (PE), poly(propylene) (PP), poly(styrene) (PS) [PE/PP/PS/PVC, and PE/PP/PS/PVDC (3 ∶ 3 ∶ 3 ∶ 1)] were performed with a controlled temperature program (step I: room temperature to 330 °C; kept at 330 °C (for PVC), 300…
During recent years, cholesteric liquid crystals have found only a few applications, one of them being temperature detection; in this study, however, we intend to show that the combination of cholesteric liquid crystals and molecules with a trifluoroacetyl function can be applied to optically detect amine vapours.
An electro‐optical technique was used to measure the rotational viscosity of nematic liquid crystals, whose structures were chosen to investigate the effects of linking groups and lateral groups on rotational viscosity. These results are compared with the theory developed by Osipov and Terentjev. It is shown that the…
Here, we report the role of dopant concentration and surface coating of CdS: Eu3+ nanocrystals on the modification of crystal structure and their photoluminescence properties by steady-state and time resolved fluorescence studies. It is found that photoluminescence properties are sensitive to the crystal structure whi…
We report the observation of thermally-induced self-diffraction in carbon nanotube (CNT) solutions under the influence of the gravity. We present a theoretical model in which CNTs are assumed to obey the Boltzmman distribution law. Under the approximations of small temperature rise and a very narrow distribution of CN…
In this study, we demonstrate that porous silicon films can be ablated by the pulsed nitrogen laser of a commercial MALDI mass spectrometer. The extent of laser-induced ablation was found to depend on the doping level and surface chemistry of the porous silicon film. Using direct laser writing with or without a mask,…
We have studied V2AlC (space group P63∕mmc, prototype Cr2AlC) by ab initio calculations. The density of states (DOS) of V2AlC for antiferromagnetic, ferromagnetic, and paramagnetic configurations have been discussed. According to the analysis of DOS and cohesive energy, no significant stability differences between spi…
Bismuth and tellurium were electrodeposited from acidic aqueous solutions of and at constant potentials in order to produce a film for miniaturized thermoelectric devices. Electrodeposition behavior was examined using cathodic polarization and electrochemical quartz crystal microbalance techniques. The solution compos…
The effect of the electron withdrawing or donating character of groups located at the periphery of the phthalocyanine ligand, as well as the influence of polar and nonpolar solvents are of importance for the redox chemistry of metal phthalocyanines. Continuous wave and pulse electron paramagnetic resonance and pulse e…
Single-walled carbon nanotubes (SWCNTs) as reinforcing components were extended into silica monoliths and thin films via covalent functionalization for the first time. Silica materials have poor mechanical attributes, which limit their applications. Because of the extreme flexibility of SWCNTs and their large interfac…
An organic mixed valence compound with a spacer length of 25 unsaturated bonds separating two amine redox centres was synthesised and the electron transfer behaviour was investigated in the context of a Mulliken-Hush analysis in order to estimate the longest redox centre separation for which an intervalence charge tra…
Measuring the magnetic moments of solids that are air and moisture sensitive is difficult, particularly when the net magnetic moments are small, as is the case for the organometallic compounds described here. The use of quartz tubes to contain the compounds has been developed and applied to substituted ytterbocene bip…
Electroactive polymers can be engineered at the molecular level to recognise external stimuli, they are conductive and they are capable of localised processing. These are properties which make them ideal building blocks for intelligent materials. This article investigates the suitability of carbon nanotubes for enhanc…
A hybrid supercapacitor based on poly3-methyl thiophene, activated carbon, and a gel polymer electrolyte GPE was fabricated and characterized. GPE was synthesized from polyethylene oxide-tetra ethyl ammonium tetra fluoro borate Et4NBF4-propylene carbonate-ethylene carbonate-nanoclay. The supercapacitor was characteriz…
We compare two routes for creating protein adsorption-resistant self-assembled monolayers (SAMs) by chemical modification of silicon surfaces with poly(ethylene oxide) (PEO) oligomeric derivatives. The first route involves the assembly of 2-methyl[(polyethyleneoxy)propyl]trichlorosilane (Cl3SiMPEO) films onto oxidized…
Styrene can be oxidised by TBHP to styrene oxide with high selectivity/yield using barium oxide (with or without gallium oxide support) as a simple, inexpensive and reusable solid catalyst; compared to the other alkaline and rare earth metal oxides, barium oxide showed a much better performance in the styrene epoxidat…
Ru is examined as a barrier/seed layer in different layer stacks, with and without Ta, for a Cu/low-κ system. Ru was found to promote a more pronounced Cu(111) texture than Ta, and the texturing appears to increase with the increase of the Ru-layer thickness. Physical-vapor-deposited Cu films on both Ru and layers are…
Abstract: Principal features of method of metal magnetic memory (MMM) as compared to known magnetic NDT methods are considered. Among the basic features of the MMM method, that it is based on use of the own magnetic leakage field (SMLF), arising in ferromagnetic and paramagnetic products on accumulations of high-densi…
Replication of mesoporous silica to ordered mesoporous carbon (OMC) has been studied with the recently discovered large-pore MCM-48-like cubic Iad mesoporous silica (KIT-6), with particular interest in the effect of the silica pore connectivity. The carbonization was performed with sucrose or furfuryl alcohol under va…