Materials Literature
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Dimers of inclusion complexes were formed from a new cryptand and viologens (paraquats) driven by dipole-dipole and face-to-face pi-stacking interactions as shown by mass spectrometric characterization and X-ray analysis.
Combinatorial sputtering methods were used to produce thin films of amorphous Si-Al-Mn whose composition varied in a linear and orthogonal manner. Electrochemical investigations were performed on over 200 compositions of Si-Al-Mn with either standard coin-type test cell hardware or a 64-channel combinatorial electroch…
Hematite@silica@polypyrrole (Fe2O3@SiO2@PPy) ellipsoidal sandwich composite spheres as well as SiO2, SiO2/PPy, PPy hollow capsules and PPy ellipsoidal hollow capsules with movable hematite cores were successfully fabricated by hematite (α-Fe2O3) olivary particles. Monodispersed α-Fe2O3 olivary particles were firstly p…
The orthorhombic α″ martensite was formed in Ti-8 mass%Mo alloy by quenching from 1223 K. The purpose of this study was to investigate phase transformation of the α″ martensite structure by isothermal aging. In differential scanning calorimetry curve of the quenched specimen, an exothermic peak that indicated decompos…
Mixtures of methanol with increasing fractions of formic acid were used to progressively transform the morphology of polyaniline starting from nanofibers to compact conventional films. It was demonstrated that the methanol/formic acid mixture could be used as a viable solvent system for nanostructured polyaniline to a…
New ester-type banana (bent-shaped) monomers, 1,3-phenylene bis[4′-(alken-1-yloxy)-biphenyl-4-carboxylate]s Ia–Vb, with different substituent(s) on the central phenyl ring (H, CH3, Cl or NO2) and alkenyl tails in the side arms (decenyl or undecenyl) were prepared. The analogues IIIa–IVb with 4-chloro- or 4,6-dichloro-…
Scanning Kelvin probe force microscopy (SKPFM) is used to study the initial stages of atmospheric corrosion of an AlMg alloy and of physical vapor deposition (PVD) deposited 2 μm Al dots on pure Mg. The latter system is used as a model of a two-phase AlMg alloy. The influence of was studied in situ in humid air using…
We present the latest results for two RF/microwave devices and structures that we are developing at the University of Toronto, based on transmission-line NRI metamaterials. The first example is a super-resolving planar lens around 1 GHz and the second is a low-profile antenna, radiating vertical polarization, around 3…
Reaction of the lithium salt of EDT-TTF-2-(4-methyl)oxazoline with chloro-diphenylphosphine afforded the novel redox active chiral chelating ligands, EDT-TTF-phosphino-oxazolines, for which a palladium (II) dichloride complex was synthesized and structurally characterized.
The first examples of electrically switchable and photo-responsive mesophases in a novel class of bent-core azo compounds, consisting of only five aromatic rings and no imino functionality (–CHN–), are reported. The mesophases have been identified as B1, B2 and a new mesophase, Bx, on the basis of the results of polar…
A practical, clean, single step oxidative modification of polysaccharides by H(2)O(2) catalysed by water soluble iron phthalocyanine, exemplified with starch, allows quantitative preparation of a range of tailor made materials without producing any waste.
Single-crystalline La0.5Ca0.5MnO3 nanowires have been successfully prepared by a hydrothermal method at low temperature. X-Ray diffraction (XRD) results show that the La0.5Ca0.5MnO3 nanowires have an orthorhombic perovskite structure without any other impurity phase. Transmission electron microscopy (TEM) images demon…
An as-cast 30wt%Cr-2.3wt%C cast iron was destabilised in the temperature range of 900-1 100°C for times of 2-8 h, followed by air cooling to room temperature. The resultant microstructures were examined using light microscopy (LM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Volume f…
Highly crystalline oligopyrene nanowires have been prepared by template-assisted electropolymerization of pyrene in boron trifluoride diethyl etherate medium, which can emit strong blue, green or red fluorescence as excited at 405, 488 or 543 nm, respectively.
Motivated by the observed thickness-scaling of the coercive field in ferroelectric films over five decades, we develop a statistical approach towards understanding the conceptual underpinnings of this behavior. Here the scaling exponent is determined by the field-dependence of a known and measured quantity, the nuclea…
Peptides that promote the rapid, room-temperature precipitation of amorphous germania nanoparticle networks from solution have been identified via use of a combinatorial peptide display library.
A new series of unsubstituted and halogenated silicon(IV) phthalocyanines with two axial poly(ethylene glycol) (PEG) chains having an average molecular weight of 550 or 750 (PEG550 or PEG750) have been synthesised by treating the corresponding silicon phthalocyanine dichloride with PEG methyl ether in the presence of…
A novel single-step approach have been applied to fabricate CuS micrometer-sized hollow spheres; the procedure is based on a template interface reaction between CuCl and sulfur liquid droplets in ethylene glycol solvent.
Sponge-like polymer membranes, formed by templating sea urchin skeletal plates, were used as an environment in which to precipitate calcium carbonate. Using double diffusion conditions and under a specific range of reagent concentrations single crystals of calcite with sponge-like morphologies were precipitated, whose…
Thin films comprised of In2S3 nanorods have been prepared on glass substrates by metal-organic chemical vapour deposition using [Et2In(S2CNMenBu)] without either template or catalyst.