Materials Literature
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A reinvestigation of nearly stoichiometric RTiO 3 samples shows that (1) the transition from ferromagnetic to antiferromagnetic Ti–O–Ti interactions with increasing R 3+ -ion radius r 3+ occurs at r 3+ ≈1.11 Å where orthorhombic ( Pbnm ) RMO 3 perovskites universally change structure from a cooperative rotation of und…
Presenting breakthrough research pertinent to scientists in a wide range of disciplines-from medicine and biotechnology to cosmetics and pharmacy-this Second Edition provides practical approaches to complex formulation problems encountered in the development of particulate delivery systems at the micro- and nano-size…
An innovative infrared nonlinear optical crystal CsGeBr3 was synthesized. Ab initio calculations on CsGeBr3 were also carried out in order to analyse the second-order nonlinear susceptibilities. From its powder x-ray diffraction pattern, this crystal was characterized as a rhombohedral structure with an (R3m, No 160)…
While several studies have suggested that secondary electrons dominate electron beam induced deposition (EBID), we demonstrate that primary electrons (PE’s) contribute significantly to the deposition for nanoscale EBID over the electron beam energy range (500–20keV). High-aspect ratio pillar growth is a signature of E…
Two Anderson-type heteropolyanion-supported copper phenanthroline complexes, [Al(OH) 6 Mo 6 O 18 {Cu(phen)(H 2 O) 2 } 2 ] 1+ ( 1c ) and [Al(OH) 6 Mo 6 O 18 {Cu(phen)(H 2 O)Cl} 2 ] 1 - ( 1a ) complement their charges in one of the title compounds [Al(OH) 6 Mo 6 O 18 {Cu(phen)(H 2 O) 2 } 2 ][Al(OH) 6 Mo 6 O 18 {Cu(phen)…
A series of glasses (TeO2)x (B2O3)1-x with x = 0.6, 0.63, 0.65, 0.70, 0.73, 0.75, 0.78 and 0.80 were synthesized by rapid quenching. Longitudinal and shear ultrasonic velocity were measured at room temperature and at 5 MHz frequency. Elastic properties, Poisson’s ratio and micro hardness have been calculated from the…
The band structure and the magnetic and elastic characteristics of SrFeO 3 and LaFeO 3 perovskites with ferromagnetic and antiferromagnetic collinear spin configurations (of the A, C , and G types) are investigated using the ab initio pseudopotential method (the VASP program package) with the inclusion of the single-s…
Four series of liquid crystal dimers have been prepared containing either ether‐linked or methylene‐linked spacers. Changing the spacer from being ether‐linked, i.e. O(CH2) n O, to methylene‐linked, i.e. (CH2) n +2, results in decreased nematic–isotropic transition temperatures, and this reduction is more pronounced f…
Five mutations in the ENAM gene have been found to cause hypoplastic amelogenesis imperfecta (AI), with phenotypes ranging from localized enamel pitting in carriers to severe hypoplastic AI. To determine the generality of ENAM mutations in hypoplastic AI, we sequenced the ENAM gene in ten Turkish families segregating…
Au/Fe2O3 catalysts prepared using co-precipitation are described and discussed for the preferential oxidation of CO in the presence of H2, H2O and CO2. A catalyst prepared using a two-stage calcination procedure (400 °C followed by 550 °C) achieves target conversion and selectivity (>99.5% CO conversion and >50% selec…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSoluble Nylon-Functionalized Carbon Nanotubes from Anionic Ring-Opening Polymerization from Nanotube SurfaceLiangwei Qu, L. Monica Veca, Yi Lin, Alex Kitaygorodskiy, Bailin Chen, Alecia M. McCall, John W. Connell, and Ya-Ping SunView Author Information Department of Chemistry a…
Specialty chemicals based on renewable resources are desirable commodities due to their eco-friendly nature and "green" product characteristics. These chemicals can demonstrate physical and chemical properties comparable to those of conventional petroleum-based products. Suitably functionalized amines in the triacylgl…
Highly ordered large-pore periodic mesoporous organosilica (PMO) with a rodlike morphology was successfully synthesized at low acid concentrations and in the presence of inorganic salt using triblock copolymer P123 as a template. The inorganic salt can not only promote the formation of highly ordered mesoporous struct…
Dispersed polymer nanocapsules can serve as nano-sized drug carriers to achieve controlled release as well as efficient drug targeting. The dispersion stability and the primary physiological response are mainly determined by the type of the surfactant and the nature of the outer coating. Their release and degradation…
The electrooptical characteristics of carbon nanotube-doped liquid crystal (LC) devices were investigated. Two complementary operation modes of the liquid crystal cells were fabricated. The measured results reveal that anisotropic carbon nanosolids modify the dielectric anisotropy and the viscosity of the liquid cryst…
The application of parallel (synchronous) particle swarm optimization (PSO) to electromagnetic absorber design is described. Synchronous PSO is a version of PSO that allows for parallelization and hence faster optimization. The velocity updating rule is empirically determined, and a simple approach is presented to imp…
Cellular MR imaging is a young field that aims to visualize targeted cells in living organisms. In order to provide a different signal intensity of the targeted cell, they are either labeled with MR contrast agents in vivo or prelabeled in vitro. Either (ultrasmall) superparamagnetic iron oxide [(U)SPIO] particles or…
Dithiocarbamates are used as adsorbates for the preparation of gold nanoparticles. A range of mono- and tetrakis-functionalised dithiocarbamate ligands containing alkyl, benzyl and resorcinarene cavitand substituents are synthesised. Nanoparticles are prepared by a two-phase synthesis and are characterised by 1H NMR s…
Different dimensional cupric oxide (CuO) nanocrystals and their architectures have been prepared on copper foil via a mild hydrothermal process with the introduction of different types of surfactants. The X-ray powder diffraction (XRD) and energy dispersive X-ray (EDX) patterns indicate that the products are pure CuO…
One of the key issues of phonon dynamics of nano- and micrometer-scale crystals is the identification of the observed Raman modes. Due to the tilted orientation of small crystallites, the usual Raman selection rules pertaining to the symmetry axes no longer hold, and mixed-symmetry modes need to be considered in order…