Materials Literature
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Photo-reversible Pb2+-complexation in a purely aqueous environment exhibiting a thermosensitive phase transition at a lower critical solution temperature was achieved using a synthetic copolymer composed of N-isopropyl acrylamide and spiropyran acrylate.
A conducting polymer shunt capable of providing overcharge protection for rechargeable lithium batteries via a reversible, internal, self-actuating mechanism is described. A microporous separator was impregnated with poly(3-butylthiophene), an electrochemically active polymer that becomes electronically conducting whe…
Thermally-initiated living radical graft polymerization of poly(ethylene glycol) methyl ether methacrylate (PEGMA) with ozone-pretreated fluorinated polyimide (FPI) via the reversible addition–fragmentation chain transfer (RAFT)–moderated process was carried out. The chemical composition and structure of the copolymer…
Monolayer protected nanoclusters are of current interest due to their ease of synthesis, high stability and possibility to precisely control their aspect ratio by preparation procedures, so that they can be tuned for a wide range of applications. Since these nanostructured metallic particles show fascinating size depe…
A reaction product analysis of single wall carbon nanotubes functionalized by solvent-free and aqueous-based arenediazonium species is discussed. Both GC-MS on the thermolysis products along with XPS analysis of the materials, suggests that the only functionality on the SWNT is the arene group. The mechanism is indic…
Regular pattern formation based on template synthesis is overviewed from the submicron scale to the submolecular level. Size of patterns of course depends on size of template. Specificity and precision of interaction between the templates and between patterned materials are apparently correlated with the size and prec…
A phase-separated acidic ionic liquid affords to catalyze a reaction of pyrrole with benzaldehyde in dichloromethane, forming porphyrins in a comparable yield to the Lindsey method and is reusable at least ten times without loss of catalytic activity.
Depending on the conditions the reaction of tris(trimethylsilyl)methoxysilane (1) with potassium tert-butoxide either in benzene and in the presence of 18-crown-6 or in THF gives either the crown ether adduct of potassium-methoxybis(trimethylsilyl)silane (2), or 2-methoxytetrakis(trimethylsilyl)disilanyl potassium (3).
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…