Materials Literature
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Cellulosic ethanol production has drawn much attention in recent years. However, there remain significant technical challenges before such production can be considered as economically feasible at an industrial scale. Among them, the efficient conversion of carbohydrates in lignocellulosic biomass into fermentable suga…
Recently, the number of applications of nanomaterials in medicine, cosmetics and food to which we are directly exposed has been expanding rapidly. The safety of such nanomaterials has not been well assessed, because nanomaterials have been considered as safe as common larger sized materials which are known not to be a…
The new vanadoborate-supported zinc complex [Zn(teta)]6[(VO)12O6B18O36(OH)6](H2O) ・8H2O (1, teta = triethylenetetramine) was synthesized hydrothermally and characterized by elemental and thermogravimetric analysis, and IR and UV/Vis spectroscopy. Complex 1 crystallizes in the trigonal system in space group R3̄ and con…
The fabrication of diamond nanowhiskers obtained by room temperature H-etching of diamond samples formed by self-assembled detonation nanodiamond grains is reported. Arrays of vertically aligned quasi-1D structures (up to 1 m in height) can be reproducibly obtained using a dual mode plasma PA-CVD technique. The morpho…
* McMaster University, Nuclear Research Building 104, 1280 Main Street, Hamilton, Ontario, L8S 4K1 Canada. For correspondence contact Carmel Mothersill at the above address, or email at [email protected]. (Manuscript accepted 22 November 2010)
Abstract Bavenite is an orthorhombic calcium beryllium aluminosilicate, a ≈ 23.2, b ≈ 5.0, c ≈ 19.4 Å, V ≈ 2250 Å3, Z = 4, that crystallizes in the space group Cmcm. The crystal structures of 24 bavenite samples from various localities worldwide were refined to R1 values from 2.4 to 7.5% based on ∼1330 unique reflecti…
Based on ab initio total energy calculations, the structural, electronic, mechanic, and magnetic properties of PdH x are investigated. It is found that bulk modulus of PdH x is larger than the metal Pd with the hydrogen storage except Pd 4 H 2 . The calculated results for the magnetic moments show that the hydrogen ad…
Single phase orthorhombic perovskite Ho 1− x La x MnO 3 ( x = 0.1, 0.15) compounds are successfully synthesized by using a sol-gel method. We find that the orthorhombic perovskite structure of HoMoO 3 compound can be stabilized by partial substitution of smaller Ho ion by larger La ion. The magnetic properties of orth…
An enhancement-mode (E-mode) AlGaN/GaN high electron mobility transistor (HEMTs) was fabricated with 15-nm AlGaN barrier layer. E-mode operation was achieved by using fluorine plasma treatment and post-gate rapid thermal annealing. The thin barrier depletion-HEMTs with a threshold voltage typically around −1.7 V, whic…
We have recently constructed a phenomenological theory that provides a unified explanation for athermal and isothermal martensitic transformation processes. On the basis of this theory, we predict some properties of martensitic transformation and confirm them experimentally using some Fe-based alloys and a Ni-Co-Mn-In…
The temperature impact on the Ohmic contact to Gallium Nitride (GaN) device properties is investigated in the range of 25°C to 300°C by means of the Transmission Line Method (TLM) technique. This study is centered in two kinds of Ohmic contacts: Implanted N+GaN and heterojunction AlGaN/GaN contacts. For N+contact resi…
Structural, hydrogen bonding and in situ studies of the effect of hydrogen dilution on the passivation by amorphous silicon
A GaN-based betavoltaic microbattery was demonstrated. The wide-band gap semiconductor of GaN and pure beta radioisotope source of63Ni were used as the converter and the energy source. The GaN-based p-i-n junction wafers were epitaxially grown by metal-organic, chemical-vapor deposition (MOCVD) on the 2-inch c-plane s…
The European Yield Models (EYM) concept has been applied to observe an experimental study of single-dowelled mortise and tenon. Specimens consisting of structural size mortise and tenon dowelled with 20.6 mm diameter were axially loaded in shear. Test variables are the material for the dowels namely steel; glass fibre…
Abstract UV‐curing technique was employed in this study to prepare polyester‐acrylate nanocomposite films with silane‐grafted silica nanoparticles. Methacryloxypropyl trimethoxysilane was grafted to the surfaces of silica nanoparticles to improve dispersion of silica nanoparticles as well as interfacial adhesion betwe…
Rate capability tests showed that artificial graphite after spheroidization treatment exhibited a higher capacity in the higher C-rate region (2~10C) at a 0.1 C rate charge and variable C-rates discharge. Artificial graphite after spheroidization treatment exhibited a higher capacity in the higher C-rate region (0.5~9…
This research was carried out to investigate the effect of gas adsorption towards the electrical resistance of carbon nanotubes (CNTs) thin film. CNTs were synthesized by Floating Catalyst Chemical Vapor Deposition (FC-CVD) method on quartz substrate at 950°C under methane gas flow rate of 150 Standard Cubic Centimete…
O objetivo deste trabalho foi avaliar as alterações químicas de solos tratados com água residuária de café (ARC). O experimento foi conduzido em colunas de PVC, onde foram avaliadas quatro doses de ARC (0; 174; 522 e 870 t ha-1), em dois Argissolos Amarelos subdivididos em quatro camadas, para dois períodos de incubaç…
Abstract To obtain novel intermediate temperature alloy solders with a melting temperature of 400–600°C, nominal (Ag‐Cu 28 )‐30Sn alloys without or with a trace addition (0.5 or 1.0 wt.%) of rare earth (RE) element La were prepared by mechanical alloying. The aim of this research is to investigate the effects of the a…
Abstract Ein neuer Wärmedämmstoff aus extrudiertem Polystyrol‐Hartschaum (XPS) mit geringerer Wärmeleitfähigkeit wurde entwickelt, um die erhöhten Anforderungen an einen dauerhaften Wärmeschutz von Gebäuden einfacher und mit geringerem Materialaufwand zu erfüllen. Die bewährten mechanischen und hygrothermischen Eigens…