Materials Literature
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We present the results of ab initio DFT plane wave periodic structure calculations of the LaMnO3 (001) surface. The effects related to three different kinds of pseudopotentials, the slab thickness, magnetic ordering, and surface relaxation are studied and discussed. The antiferromagnetic surface lowest in energy (that…
A polyethylene/montmorillonite(MMT) nanocomposite was prepared by in situ polymerization method using MMT-supported methylaluminoxane(MAO) cocatalyst and/or Cp2ZrCl2 catalyst. The catalyst components had been supported on the unmodified MMT-Na and modified commercial product, Cloisite 25A. With XRD it was found that t…
A new method of Standard Porosimetry (MSP) for investigation of any type of porous materials, including soft, frail, amalgamated materials, films and powders has been developed. The method is relatively simple and non-destructive and can be used for measurements in a wide range of pore sizes from 0.3 nm to 3×106 nm. T…
Multi-stage mass spectrometry (MSn) on [(M + Ag - H)x + Ag]+ precursor ions (where M = an amino acid such as glycine or N,N-dimethylglycine) results in the formation of stable silver (Ag3+, Ag5+ and Ag7+) and silver hydride (Ag2H+, Ag4H+ and Ag6H+) cluster cations in the gas phase. Deuterium labelling studies reveal t…
Transparent conductive, Al-doped ZnO films (ZnO:Al) have been deposited by means of an atomic layer deposition method with the surface chemical compositions of ZnO (film A) and Al 2 O 3 (film B). The sheet resistance, surface work function, and structure characteristics of ZnO:Al films have been investigated. Organic…
We applied catalytic oxidation using TEMPO (2,2,6,6 tetramethylpiperidine-1-oxy radical), sodium bromide, and sodium hypochlonte to aqueous kraft pulp slurries at pH 10.5 under various conditions at room temperature to chemically modify pulp fiber surfaces. This TEMPO mediated oxidation can effectively introduce aldeh…
In our endeavor to improve the cyclic stability of La-Mg-Ni-Co type alloys, hydrogen storage alloys were prepared and the structure and electrochemical properties of these alloys were investigated systematically. X-ray diffraction and Rietveld analyses revealed that the major phases are the phase and the phase. Electr…
Two azide-bridged chiral Cu(II) compounds, [Cu(R,R-dacy)(N3)2]n (R,R-dacy = trans-(1R,2R)-diaminocyclohexane) and [Cu(S,S-dacy)(N3)2]n (S,S-dacy = trans-(1S,2S)-diaminocyclohexane), with two-dimensional layer structures exhibiting end-to-end and end-on azide bridging patterns, were prepared and among them was examined…
Abstract Recent progress in the field of artificial photosynthesis is reviewed. Among various approaches to oxidizing the water molecule, attention has been focused on the two-electron chemical conversion processes mediated by metallo-porphyrins upon visible light irradiation. Photochemical oxygenation reactions such…
A mesoporous silica containing gold nanoparticles (mpAu–SiO2) has been obtained by one pot synthesis, starting from tetraethylorthosilicate (TEOS) and colloidal gold particles (2–5 nm) stabilized with N-[3-(triethoxysilyl)propyl] O-2(dicetylmethylammonium)ethyl urethane. This stabilizer ligand interacts with gold nano…
In this work we discuss, from a variational viewpoint, the equilibrium problem for a finite number of Volterra dislocations in a plane domain. For a given set of singularities at fixed locations, we characterize elastic equilibrium as the limit of the minimizers of a family of energy functionals, obtained by a finite-…
Microbiologically Influenced Corrosion (MIC), otherwise coined as biocorrosion, is the influence of microorganisms on the kinetics of corrosion processes of metals, minerals and synthetic materials caused by their adhesion and growth. A closer observation of the MIC failure case analyses of engineering components show…
Banana fibre has been modified with silane treatments, acetylation, cyanoethylation, latex treatment and mercerization to improve the interfacial bonding with phenol formaldehyde (PF) resin. Scanning electron microscopy was used to study the morphology of the banana fibre. The tensile properties of the modified fibre…
Organic solvents are amongst the most powerful solubilization agents for a large number of water-insoluble drugs. A number of equations has been reported for mathematical representation of solute solubility in mixed solvents. The question is then posed--is there a mathematical difference between these models? To addre…
Owing to hydrophobic interactions, silyl linkers containing long alkylene chains allowed the synthesis of self-organised hybrids. Lamellar organo-silicas with phenylene or a hydrogen-bonded adenine⋯thymine complex as the bridging units are reported.
The electrical conductivity of (LSFTO) was measured in the temperature range and at oxygen partial pressures of . The conductivity was measured on both increasing and decreasing to ensure that equilibrium was reached. Long equilibration times were required at intermediate oxygen partial pressures between and . The pre…
Searching the root of fibers The new frontier fibers? Superfibers Carbon fiber expands toward twenty-first century High-function fiber Frontier of health and comfort fiber Polymer fibers for health and nutrition Fibers in medical applications Developments in nano-fiber for the new millennium.
Diffusion and permeation in polymeric materials is of fundamental importance in many applications and is the subject of considerable scientific interest. Measurement methods for determining permeation through polymer sheets and within polymeric materials have been reviewed. An overview of the generic mechanisms involv…
The effect of carbon dioxide ( C O 2 ) on sodium chloride (NaCl) induced atmospheric corrosion of copper was studied in laboratory exposures using microgravimetry, ion chromatography, Fourier transform infrared spectroscopy, and scanning electron microscopy with X-ray microanalysis. With lower amount of NaCl particles…
Measurements have been obtained for the thermal resistance of sheep-wool insulation and wool–hemp mixtures, both in the form of bonded insulation batts, using a calibrated guarded hot-box. The density was 9.6–25.9 kg m−3 for the wool and 9.9–18.1 kg m−3 for the wool–hemp mixtures. The measurements were made at a mean…