Materials Literature
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Deuteron quadrupole-perturbed NMR is used to study the perturbation of orientational order in a smectic-A liquid crystal (octylcyanobiphenyl or 8CB) caused by photoinduced trans-to-cis isomerization of a photosensitive dopant (diheptylazobenzene or 7AB). The time and temperature dependences of the orientational order…
The crystal structure of meso-tetrakis(3,4,5-trimethoxyphenyl)porphinatomanganese(III) 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethenide, [MnT(MeO)3PP][TCNQF4]·3(o-C6H4Cl2), 1·3C6H4Cl2, provides the first example of a nondimeric [TCNQF4]·– that is stabilized by trans-μ-coordination to MnIII. Compound 1·3C6H4Cl2 c…
The effects of depolarization factor on the effective linear optical absorption and nonlinear susceptibility of metal–dielectric composite media are investigated. Two types of microstructures corresponding to those described by the extended Maxwell-Garnett Theory (MGT) and Effective Medium Approximation (EMA) are exam…
A phylogenetic analysis was conducted on 21 biraphid naviculoid diatom species (from three orders and five families, using 5 protoplast and 21 frustule characters) to test whether the recently described genus Craspedostauros was more closely related to members of the Mastogloiaceae or to other stauros-bearing diatoms.…
Abstract To control the donor/anion ratio of an ET (= bis(ethylenedithio)tetrathiafulvalene) salt, an anionic supramolecular assembly was designed. The supramolecular assembly based on 1,4-difluoro-2,3,5,6-tetraiodobenzene (DFTIB) and the bromide anion thus afforded an ET salt with desired 3:1 donor/anion ratio, while…
Crystallization of isotactic polypropylene (iPP) from the melt in the presence of poly(ethyleneterephthalate) (PET) fibers has been shown to produce preferential nucleation at the fiber surfaces leading to formation of columnar or transcrystalline growth. The crystalline development of PP has been examined by using op…
Abstract Polypropylene (PP) composites with glass and natural fiber mat reinforcement (GMT‐PP and NMT‐PP, respectively) are widely used in different applications, competing with metallic sheets and thermoset polymer composites. Their production occurs via melt impregnation, slurry deposition and various textile archit…
We present the effective Lagrangian for low energy and momentum spin waves in canted phases at next to leading order in the derivative expansion. The symmetry-breaking pattern $\mathrm{SU}(2)\ensuremath{\rightarrow}1$ of the internal spin group and that of the crystallographic space group imply that there is one ferro…
The performance of many wear‐resistant materials can be improved further by incorporating diamond into the structure. Diamond that has been coated with titanium is known to adhere well to the matrix particles and also prevents reaction with H 2 , which often is used in the sintering atmosphere. Two coating methods of…
Laser-ablated manganese atoms react with CO and NO mixtures upon condensation in excess argon and further annealing to produce a series of unsaturated manganese carbonyl nitrosyl complexes including Mn(CO)(NO), Mn(CO)(NO) 2, and Mn(CO) 2 (NO). The Mn(CO)(NO) complex isomerizes to Mn(CO)(η 2 -NO) on visible photolysis,…
Photoluminescence measurements have been made on float-zone and Czochralski-grown silicon samples which were doped with erbium by ion implantation. The characteristic luminescence spectra in the wavelength range between 1.5 and 1.6 μm were observed. Differences in the multiple line structure of the spectra indicated t…
Based on a good knowledge of the basic processes occurring in the initial stages of metal/polymer interface formation the preparation conditions can be selected to obtain a desired interfacial morphology. Very sharp or spread-out metal/polymer interfaces can thus be formed, the cluster density on the surface can be ad…
The photoluminescence spectra of Al2O3:Cr3+ nanopowder under excitation by a frequency-doubled YAG:Nd laser (λex = 532 nm) and a nitrogen-vapour pulsed laser (λex = 337.1 nm) have been studied. A considerable difference between the spectra of nanocrystalline and macrocrystalline samples has been observed. The nanocrys…
Abstract A commercial bentonite (primarily smectite) from Fischer Scientific Company (F bentonite) and a natural bentonite from Peru (P bentonite) were used in the preparation of pillared clays with polyoxymetal cations of Al that were subsequently modified with Ce and La. Several Al/metal ratios (5 and 9) were used t…
Laue data reduction has now reached a level of sophistication that allows nearly automated processing to be performed. The software described enables complete reduction of the data with essentially no user intervention, making Laue processing almost as straightforward as monochromatic data processing. Interactive work…
Abrasion and heat damage to desized and scoured cotton fabric during drying in a household tumble dryer are evaluated by SEM (scanning electron microscopy) and weight and tensile/strain tests for breaking strength and elongation. Wet fabric dried with heat shows severe fiber damage, and wet fabric tumbled at room temp…
Butt welds of duplex stainless steel plate (grade 2205) have been produced using grade 2209 consumables for a variety of welding processes employed in the shipbuilding industry. The welding processes were used initially with interpass temperatures in the range 250–350°C. When the interpass temperature was controlled t…
Alloy Cu-10% Ni (ASTM B-111, UNS C70600) has been used extensively for condenser and heat exchanger tubes in power stations. However, there have been cases of severe localized corrosion in this alloy. This paper presents the evaluation of Cu-10% Ni in a dynamic online monitoring system with one-way circulation using a…
Abstract Chlorite and illite are commonly associated with ubiquitous secondary K-rich feldspar in the rocks located immediately above and below the Precambrian-Paleozoic unconformity in southwestern Ontario, and elsewhere in the mid-continent of North America. This alteration assemblage is attributed to long-distance…
Electron diffraction analysis, nuclear magnetic resonance measurements, structure determinations and refinements were performed on two ferroelectric lead-containing ceramics (classical and relaxor), with tetragonal tungsten bronze structure, in order to investigate the origin of the relaxor behaviour in such compounds…