Materials Literature
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Combined interaction of triple hydrogen bonding, dipolar pi-pi aggregation and micro-segregation in a melamine-barbituric acid dye assembly leads to a columnar mesophase which could be characterized by optical polarising microscopy, differential scanning calorimetry and X-ray diffraction.
The structural stability and oxygen permeation properties of Sr 3 − x La x Fe 2 − y Co y O 7 − δ with 0 ⩽ x ⩽ 0.3 and 0 ⩽ y ⩽ 1.0 have been studied at high temperature ( 800 ⩽ T ⩽ 900 ° C ) and in the oxygen partial pressure range 10 − 5 ⩽ p O 2 ⩽ 0.21 atm. These phases have a perovskite-related intergrowth structure…
We report high pressure Raman studies on as-prepared, purified, and solubilized single-walled and aligned multi-walled carbon nanotubes. The pressure dependence of radial (R) and tangential (T) vibrational bands in these samples is measured and compared with the results from other studies. In single-walled nanotubes,…
A bis-urea macrocycle 1 was synthesized and shown to form extended nanotubular columns by X-ray crystallography.
We have investigated the electronic and magnetic structures of Sr2FeMoO6 employing site-specific direct probes, namely x-ray absorption spectroscopy with linearly and circularly polarized photons. In contrast to some previous suggestions, the results clearly establish that Fe is in the formal trivalent state in this c…
Gold surfaces were first treated in an alkanethiol solution to form self-assembled monolayers (SAMs). The thiolated Au surface was then subjected to Ar plasma pretreatment, followed by air exposure and UV-induced graft polymerization of poly(ethylene glycol) methacrylate (PEGMA) macromonomer. In comparison with the 3-…
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Polyaniline (PANI) has been studied for some years in order to protect mild steels against corrosion in the absence of inorganic conversion layers. During the electropolymerization of PANI film, iron is passivated; the subsequent protection is dependent on the nature of this passive layer, and PANI acts as a stabilize…
Adsorption behaviour and CO oxidation activity of TiO2- and ZrO2-supported gold catalysts, prepared by adsorption of gold colloids on the supports, have been investigated by pulse thermal analysis and diffuse reflectance FTIR spectroscopy. Structural investigations using transmission electron microscopy, X-ray diffrac…
Finite-time control policies are common in batch and semi-batch operations. A novel approach is proposed that quantifies the impact of parameter and control implementation inaccuracies on the performance of such control policies. This information can be used to decide whether more experiments are needed to produce par…
Prediction of yarn properties from fibre properties and process parameters is a well-researched topic. For a number of years, mechanistic and statistical models have primarily been used to tackle the problem. Over the last ten years, neural networks have been used in increasing numbers for this purpose. However, a com…
Voltage modulated scanning force microscopy in contact mode or piezoresponse scanning force microscopy is now turning into an established technique for imaging ferroelectric domains in ferroelectric thin films. The quantities measured, however, are the amplitude and phase of a locally induced piezoelectric strain, and…
Preface Part 1. General Papers Surface effects on intrinsic thin-film stresses, R. C. Cammarata Adhesion properties of functionally gradient diamond-like carbon nanocomposite films, R. J. Narayan Adhesion improvement of magnetron-sputtered amorphous carbon coating on cemented carbide, S. Zhang and X. L. Bui Characteri…
A novel double-layered hybrid organic–inorganic material [Zn2(tp)(4,4′-bpy)V2O6] has been prepared hydrothermally and X-ray crystallographic analysis shows that it has a three-dimensional network constructed from polycatenated tetravanadate-pillared double-layered sheets.
High-quality undoped ZnO epitaxial films with mobilities as high as 120 cm 2 V -1 s -1 and carrier concentrations as low as 7.6 ×10 16 cm -3 have been grown on (1120) a -sapphire substrates using low-temperature buffer layers, a slow substrate cooling process and a modified oxygen radical cell. Pole figure measurement…
3D organization of magnetic nanoparticles has until now only been observed on a small scale. In this communication, the formation of large-scale 3D superlattices of cobalt nanocrystals (see Figure) is reported, in which the degree of organization is shown to be highly dependent on the strength of magnetic field applie…
A composite made from boron-doped carbon nanotubes and polystyrene exhibits relatively low electrical resistance and minor variations in conduction when mechanically loaded. Carbon nanotubes form a network within the plastic film, thereby establishing electrical conduction uniformly throughout the composite. Individua…
Experimental programs on fuel behavior during simulated reactivity-initiated-accident (RIA) conditions at the Nuclear Safety Research Reactor (NSRR) in Japan and the CABRI test reactor in France appear to indicate that cladding failures may occur at enthalpy values lower than would be expected. Results from two experi…
We describe laser and mass spectroscopic methods, and related modelling studies, that have been used to unravel details of the gas phase chemistry involved in diamond chemical vapour deposition (CVD) using both H/C (i.e. hydrocarbon/H2) and H/C/O (e.g. CO2/CH4) gas mixtures, and comment on the relative advantages and…
Two lanthanide coordination polymers {Tb(O2CPh)3(CH3OH)2(H2O)}n1 and {Tb2(O2CPh)6(4,4′-bipy)}n2 have been identified and isolated from a methanol solution A of Tb(OAc)3·4H2O, benzoic acid and 4,4′-bipyridine in a 1∶3∶2 ratio. Their structures have been determined by single-crystal X-ray diffraction analyses, which rev…