Materials Literature
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The exciting possibility of biosynthesis of minerals of variable morphology and with polymorph selectivity by challenging microorganisms such as fungi and actinomycetes has been described. Many fungi and actinomycetes are known to produce reasonable amounts of CO2 during growth. We show here that CO2 and characteristi…
Composite electrodes using activated carbon (AC) and indium tin oxide, ITO (5 wt % were characterized in 1 M KOH for electrochemical supercapacitors. ITO was prepared by a nitrate decomposition method and reverse precipitation method. A 75% increase in capacitance compared to pristine carbon was observed at with ITO p…
The ultraviolet stability of several high birefringence liquid crystal structures was studied. Compounds containing carbon-carbon double bond or triple bond are less stable than those containing merely phenyl rings. In addition to the structural effect, absorption wavelength also plays an important role to the degrada…
Fluorocarbon radio-frequency glow-discharge (RFGD) treatment has previously been shown to cause decreased platelet adhesion despite the presence of adsorbed fibrinogen on the surfaces. In this study platelet adhesion to fluorocarbon RFGD-treated surfaces preadsorbed with human plasma was further examined. A series of…
A novel concept of base proliferation for improving the photosensitivity of base-sensitive materials is described by presenting the autocatalytic transformation of 9-fluorenylmethyl carbamates to aliphatic amines. A 9-fluorenylmethyl carbamate, as a base amplifier, was subjected to a base-catalysed fragmentation react…
Au/TiO2 catalysts with gold loadings in the range 0.06-1.9 wt.%, prepared by 'deposition-precipitation' at pH 9, have a constant and high specific activity for the oxidation of CO: 3.9(+/- 0.4) x 10(-4) molCO s(-1) gAu(-1) at 243 K.
This article gives an overview of methods applied for surface treatment of nickel-titanium shape memory alloys in medical applications. The different methods are classified into the three major groups: <I>removal</I>, <I>oxidation</I> and <I>coating</I>. The principle behind each group of methods is explained and the…
Polarimetry is used for continuous online monitoring of optical resolution by preferential crystallization. In combination with refractometry the liquid phase composition is determined, allowing one to follow the resolution progress quantitatively. The measurement techniques were calibrated up to relatively high solut…
Abstract The new L ‐lysine alkali‐metal salts 1 – 5 (M + =Na + and K + ) with different alkyl groups at the N α ‐position were easily synthesized, and their hydro‐ and organogelation properties were investigated. All compounds were H 2 O‐soluble, and some salts, especially the potassium salts, functioned as a hydrogen…
The fabrication of large-scale ZnO ordered pore arrays by the potentiostatic electrochemical deposition method based on a two-dimensional ordered colloidal monolayer template is reported. The pore morphology evolves from hemispherical to a well-like structure by controlling the deposition potential.
Two new hexadeca-carboxy phthalocyanines have been synthesised and evaluated for their photodynamic activities; the zinc(II) analogue exhibits a high class-A scavenger-receptor mediated photocytotoxicity towards the J774 murine macrophage cell line.
A critical review is given of the various historical attempts to formulate a general, three-dimensional theory of failure for broad classes of homogeneous, isotropic elastic materials. Following that, a recently developed two-parameter yield/failure criterion is compared with the historical efforts and it is further i…
The chemical interactions between different base glass sealants and components of solid oxide fuel cells (SOFCs) were investigated. The SOFC materials considered are stabilized with 8 mol % (as electrolyte and part of the anode), Ni (as part of the anode), and the oxide-dispersion-strengthened (ODS) alloy (as intercon…
The commercial pure Mg, AZ31 and AZ61 alloys were severly plastic-deformed through equal channel angular pressing (ECAP). The grain size of pure Mg was decreased from 400 to 80 μm after ECAP and the 4 ECA pressed AZ31 alloy revealed the mixed microstructure of fine grains of less than 5 μm and coarser grains of approx…
A variable optical attenuator (VOA) based on polymer stabilized twisted nematic (PSTN) liquid crystal (LC) is demonstrated. Comparing with the normal twisted nematic LC-based VOA, PSTN exhibits a much faster response time. Moreover, the polymer networks effectively eliminate the backflow effect which exists in the nor…
The crystallization kinetics of high-density amorphous ice (HDA), made by pressure-amorphizing hexagonal ice at 77 K, and its dependence on heating rate and pressure was studied on isobaric heating between 0.2 and 1.9 GPa by displacement-temperature curves. The crystalline phases, recovered at 77 K and 1 bar, were cha…
Microwave irradiation of solutions of Zn(NO3)2 and urea provides a straightforward route to a-axis oriented crystals of needle-like morphology.
Eco-composites made from poly(lactic acid) (PLA), poly(butylene succinate) (PBS) and corn starch (CS) with a designable interface were prepared by reactive processing using aliphatic isocyanates as coupling agents. Hexamethylene diisocyanate (HDI) and lysine diisocyanate (LDI) were used as aliphatic isocyanates. Copol…
Clothing pressure distribution in tight-fit sportswear was simulated by using numerical computational method. Three sets of tight-fit sportswears were simulated on the basis of their mechanical properties. In addition, a 3D human body was also simulated in order to investigate its interaction with sportswear in the we…
Small acidic peptides comprising a repeating Phe-Asp sequence motif exert control, in vitro, on the morphology of calcite crystals similar to natural proteins from calcified tissues.