Materials Literature
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N-(4-Arylazobenzoyl)-1H-benzotriazoles 3 react with amino acids 4 and amines 6 to give azo-dye labeled amino acids (5a-m) and amines (7a-n) in high yields (74-100%) with retention of chirality.
Poly(indenofluorene) was electrochemically deposited onto anode surfaces in CH2Cl2 medium along indenofluorene oxidation. The resulting films were characterized and compared with polyfluorenes. A mechanism of polymerization is proposed in the light of cyclic voltammetry experiments and theoretical calculations.
Protective metallic coatings based on Zn are usually used to protect steel against corrosion. When coated steel sheets are subjected to corrosive environments, its corrosion behaviour is affected due not only to changes of the coating texture, but also of the microstructure. The aim of this work was to study the effec…
Digital video-microscopy measurements are reported for both elastic bandstructures and overdamped phonon decay times in two-dimensional colloidal crystals. Both quantities together allow the determination of the friction coefficients along various high symmetry directions in q-space. These coefficients contain valuabl…
Copper-cobalt ferrites with general chemical formula Cu x Co 1-x Fe 2 O 4 (with x = 0.0, 0.4, 0.6 & 1.0) were prepared by ceramic method. The solid state reaction was confirmed by XRD patterns. DC conductivity was measured by two probe method. Electrical resistivity is found to increase on lowering of sintering temper…
Mg-Y-Zn alloys have attracted much attention in recent years due to their excellent mechanical properties, which are said to be the effect of the intermediate phase (X phase) in the Mg solid solution (α phase). The formation behavior of the X phase has been reported to be a eutectic type reaction in the Mg-Y-Zn pseudo…
Oxygen-permeation measurements were carried out on a specimen in the temperature range of as a function of the oxygen partial pressure from to . Simultaneously, the open-circuit voltage of the permeation cell and the voltage upon partially short-circuiting the cell over external resistances were measured. As a result,…
Effects of pre-strain and heat treatment on shape recovery stress and phase transformation temperature in Ti-Ni-Nb shape memory alloys with various Nb content (6, 9, and 12 mol%) were investigated by tensile testing. The recovery stress of Ti-Ni-Nb alloys increased with increasing the pre-strain and then decreased aft…
The extraction of fibres from bamboo culm during the degumming process was performed with commercial xylanase. It is found that a combination of mild chemical pretreatment and enzymatic treatment is essential to achieve a high level of degumming, and better fibre separation. FTIR analysis of substances removed by enzy…
The thermal conductivity of Si nanostructres is investigated using nonequilibrium molecular dynamics (NEMD) simulation based on the Tersoff III inter-atomic potential. A reliable range of heat flux for the calculation of thermal conductivity is determined by the comparative study of NEMD simulations with different hea…
We report on the effect of Co and Ti co-doping on the thermoelectric behavior of Fe2VAl based alloys. The doped alloys, (Fe2−xCox)(V1−yTiy)Al, with compositions x=0.01–0.07 and y=0.04–0.20 exhibit a p-type thermoelectric property when the total valence electron number is below 24. The co-doping of cobalt and titanium…
YAG transparent ceramics with different microstructures were fabricated via solid-state reaction of high-purity powders. Influences of grain size, grain-boundary phases on the transmittance of the fabricated YAG ceramics were experimentally investigated. Our results confirm that the optical scattering loss in YAG cera…
In the present work, a ballistic material-model development approach is combined with transient non-linear dynamics simulations of the projectile/armour interactions to explore the armour-hard-facing potential of multi-walled carbon nanotube (MWCNT) reinforced, poly-vinyl-ester-epoxy (PVEE)-matrix composite mats. This…
The electrochemical reduction of the layered titanoniobate HTiNbO5 has allowed two new phases, (Li,H)2TiNbO5 and (Li,H)3TiNbO5, to be synthesized, the structures of which have been studied by X-ray diffraction and electron microscopy. (Li,H)2TiNbO5 is closely related to the LiTiNbO5 phase, with a “parallel configurati…
Self-assembled 3-dimensional perpendicular cylinder orientation was achieved mainly by thermodynamic control of incompatibility between the block domains, and further precise modification of size and hexagonal alignment of perpendicular cylinders was also accomplished by kinetic control of diffusive molecular mobility…
This tutorial review revisits the subject of the seminal book written by Sidney Benson in 1968. A short summary of the nature of the subject is presented, including its place in the wider world of quantitative chemistry. A number of themes are selected to illustrate its previous and continuing usefulness in evaluating…
Core–shell γ-Fe2O3/polymer 300 nm superparamagnetic nanoparticles, grafted by fluorescent dendrons using a convergent approach, showed an increase in their surface functionalization compared to grafting using a linear analogue.
With the background that certain natural systems utilize two Fe(II) centres in their prosthetic groups for the activation of O2, a ligand system containing two parallel beta-diiminato binding sites linked by a xanthene backbone ([RXanthdim]2- with residues R = 2,3-dimethylphenyl and 2,4-difluorophenyl at the iminato u…
Well-defined block copolymers of poly(methyl acrylate) and poly(2-acrylamido-2-methyl-1-propanesulfonic acid), PMA/PAAMPSA, were successfully synthesized by atom transfer radical polymerization. These amphiphilic block copolymers spontaneously form micelles with a hydrophobic PMA core and a hydrophilic PAAMPSA corona…
and particles were prepared by refluxing in water solution using polyethylene glycol as a capping agent and then annealed at different temperatures. The samples were characterized by X-ray diffraction, Raman spectra, field-emission scanning electron microscopy, and cathodoluminescence spectra. The as-prepared amorphou…