Materials Literature
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Markedly enhanced recyclability of osmium catalyst in asymmetric dihydroxylation has been achieved by using osmylated macroporous resins bearing both residual vinyl groups and quaternary ammonium moiety.
A range of quaternised tertiary amine methacrylate-based homopolymers and copolymers were synthesised as mimics of the biopolymers implicated in biosilica formation. These synthetic polymers were evaluated for their ability to catalyse and direct the structure of silica formed by condensation of silicic acid in aqueou…
A new series of low-symmetry octasubstituted metal-free phthalocyanines with the general formula H 2 N x P β 4− x ( OBu ) 8 ( x = 0-4) were synthesized by mixed condensation of two different substituted precursors (4,5-dibutoxy- phthalonitrile and 1,4-dibutoxy-2,3-dicyanonaphthalene). Their electronic absorption spect…
We present a novel and convenient process for fabrication of arrays of nanoporous tin oxide nanorods by electrodeposition of tin into anodic aluminum oxide membranes followed by anodization of tin nanorods to create nanochannels. The nanoporous tin oxide nanorods were long and in diam, with nanochannels of in diam. Th…
Recent progress in domain analysis, which has been attained by the notable advancement of transmission electron microscopy (TEM), is reviewed by selecting certain topics related to displacive and magnetic phase transformations. Energy-filtered TEM, which separates the elastic scattering from the unwanted inelastic one…
A high-luminance and high-color-purity inorganic phosphor has been developed for the red component in ac thin-film electroluminescent devices using electron-beam evaporation. The influence of the Eu concentration on the luminescence and response characteristic of the devices was studied. A high Eu concentration causes…
The mechanisms of thermal expansion and shrinkage for sintered samples, with different relative densities, have been investigated in air during thermal cycle measurements between 50 and . The perovskite samples showed a large thermal expansion coefficient (TEC) at approximately due to a change from monoclinic and hexa…
We studied the spreading of a thin film of hexadecane oil on a hydrophobic polystyrene surface, which is partially covered with tiny water droplets. In spite of the fact that the spreading coefficient of hexadecane is slightly negative on water, the oil actually spreads faster on the droplet covered polystyrene than o…
We have successfully utilized the sol-gel method to synthesize epoxy-silica hybrid material at nanoscale. Using the sol-gel process we could overcome many disadvantages of conventional composite materials. In this research, two different methods are recommended — a one-step process and a two-step process — to synthesi…
The objective of the study was to control the nucleation and main crystal formation of lithium disilicate, Li2Si2O5, by an effective nucleating agent to develop high-strength, translucent glass-ceramics.The authors used P2O5 as nucleating agent to precipitate lithium disilicate in glasses derived from the SiO2-Li2O-Al…
Magnetic Barkhausen noise measurement (MBN) is a relatively new non-destructive detection technique. Its working principle is based on Barkhausen discontinuities or noise when a ferromagnetic material is subjected to a varying magnetic field. MBN is being used to characterise the stress state of a ferritic stainless s…
A variety of additives and underlayers were examined to obtain good soft magnetic properties for Fe-Co system films with a high saturation magnetic flux density (Bs) of the 2.4 T class. It was found that Al2O3 is an excellent material for use as an additive. The continuous columnar structure of the film is formed by A…
The spark plasma sintering (SPS) method was applied to prepare dense compacts of proton conducting Sr-doped LaPO 4 at relatively low sintering temperatures. A relative density higher than 98% could be achieved with the SPS method when sintering temperatures above 1323 K were employed, whereas no more than 94% was achi…
The encapsulation of molecular species has received considerable attention in recent years. Polymers, dendrimers and microemulsions along with other systems have been used as precursors for the synthesis of encapsulating agents. Especially important in this field is the core-shell architecture. This structure offers t…
Clay-carbon nanotube composites were prepared by employing the catalytic chemical vapor deposition method (CCVD) over different transition metal oxides supported on montmorillonite. Various analytical techniques including SEM, TEM, XRD and DTA/TGA were used for the characterization of the final composite materials. Th…
Over recent years, little attention has been paid to the electrooptic properties of racemic modifications of smectic liquid crystals, however, in this communication we report on a chiral response of a racemic modification to an applied electrical field while in its synclinic smectic C phase.
Two approaches have been pursued to construct bulk magnets by ordering spins of unpaired 2p-electrons of organic free radicals. One is an intermolecular approach based on the crystal design of stable radicals. The other consists of intramolecular alignment of spins in polyradicals having many unpaired electron. The tw…
Local minima configurational averaging (CA) and Monte Carlo (MC) simulations are used to examine in detail the variation of thermodynamic and structural properties of binary oxide solid solutions with the volume mismatch between the end members. The maximum volume mismatch studied corresponds to that in the CaO MgO so…
The aim of this study is to understand the performance of firefighter protective clothing in preventing thermal injury of skin that may result from exposure to high-intensity thermal radiation. A mathematical model is developed to study transient heat and moisture transport through multilayer fabric assemblies. The mo…
An analysis has been made of the tensile strength of sisal fibres and the interfacial adhesion between fibres and polyester resin droplets. Density and microscopy methods were used to determine the cross-sectional area of the sisal fibres. The average tensile strength of treated sisal fibres decreased by a modest amou…