Materials Literature
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Magnesium alloys are potential materials for use in biodegradable hard-tissue implants, but the fast degradation rate in a biological environment limits their applications. In order to improve the corrosion resistance, a dense, adhesive, and biocompatible bilayered coating is fabricated on AZ91 magnesium alloy by mean…
Pyrroles prepared by the reaction of alkyl isocyanoacetates with nitroalkenes or vinylsulfones (Barton-Zard reaction, BZ reaction) are useful for the synthesis of biologically active pyrroles, porphyrins, polypyrroles, and dipyrromethene dyes.This review covers recent development of the BZ reaction and its application…
Epitaxial graphene films have been formed on the C-face of semi-insulating 4H-SiC substrates by a high temperature sublimation process. Nanoscale square antidot arrays have been fabricated on these graphene films. At low temperatures, magnetoconductance in these films exhibits pronounced Aharonov-Bohm oscillations wit…
A task-specific ionic liquid containing a carboxylate group with the ability to dissolve metal oxide and organic ligands has been used as the solvent to prepare lanthanide complexes without the addition of extra solvent; thus a soft material with intense photoluminescence has been obtained by directly dissolving Eu(2)…
We report the syntheses of six new salts of the iron(III) complexes of four hexadentate Schiff bases of the saltrien-type derived from 1,8-diamino-3,6-diazaoctane and 2 equiv. of the appropriate salicylaldehyde derivative. Three of these new compounds undergo gradual spin-transitions centred between 155-204 K in the s…
A series of porphyrin or metalloporphyrin-doped silica films with bimodal porous structures were successfully fabricated using polystyrene spheres and a surfactant (CTAB) as structure-directing agents, and examined for chemosensory applications to detect trace amounts of vapours of explosives such as TNT (2,4,6-trinit…
Instant hydrogelation of coumarin-derivatized glycine has been demonstrated in the absence of long-chain hydrophobic groups upon formation of a zinc(ii) coordination polymer, which exhibits fluorescence enhancement upon gelation.
Luminescent europium and terbium complexes and a mixed Eu(III)-Tb(III) complex were prepared, each with three macrocycles coordinating to a single lanthanide ion to form a trimetallic system, and can be used for the ratiometric sensing of anions in the case of the mixed complex.
The optothermal properties of nanoparticles are of interest for biosensors and highly sensitive biochip applications. In this respect, the longitudinal resonance of Au nanorods was used to transform near infrared energy into thermal energy in a microfluidic chip. The resulting heat generated effectively caused pathoge…
The double transesterification polymerization of 3′,6′-bis(pinacolatoboron)fluoran and pentaerythritol is reported. A model dimeric compound was synthesized to demonstrate the effectiveness of bis-diols to undergo a double transesterification, which is driven by formation of the energetically favored six-membered di-e…
Colloidal inclusions in thin free standing liquid crystal films are ideal model systems for 2D anisotropic dispersions. Different types of self-organization in chain and lattice structures have been observed. The orientational elasticity of the anisotropic matrix and capillary forces are the dominating interaction mec…
The synthesis of silicon/silica nanoparticle composites by the bacterium Actinobacter sp. is demonstrated. More specifically, the formation of silicon/silica nanocomposite is shown to occur when the bacterium is exposed to K2SiF6 precursor under ambient conditions. Based on the earlier reports where this bacterium has…
Supersaturated ZnO–Al2O3 (>20at.% Al) thin films are grown by pulsed laser deposition technique on silica glass substrates at 600°C. They are characterized by combining x-ray diffraction, Al-K edge x-ray absorption near edge structures (XANESs), high resolution transmission electron microscope (TEM) imaging, TE…
This paper describes the synthesis of carbon nanofibers (CNFs) on solid carbon foam (“Hairy Foam”) by catalytic decomposition of ethylene. The effect of nickel loading on fiber diameter and morphology, CNF coverage, and fiber layer thickness is studied using SEM and N2/Kr-physisorption. The surface area increased from…
Zwitterionic phosphorylcholine showed better stabilization than oligo(ethylene glycol) in protecting big gold nanoparticles.
This Feature Article provides some representative examples of the role of defect chemistry in the properties of perovskite manganites. It will be shown that a precise control of their defect chemistry is essential in order to give a reliable and meaningful correlation between physical properties and composition.
A selectivity investigation of the covalent sidewall functionalization of SWNTs by reductive alkylation (Billups reaction) is reported. The functionalized tubes Rn-SWNT were characterized by UV-vis-nIR absorption, nIR emission and Raman spectroscopy. The reduction of SWNTs with sodium and the subsequent alkylation of…
One or two-component gels with tunable emission colours were obtained from the assembly of three red–green–blue fluorescent molecules. The intermolecular energy transfer between these molecules played a crucial role in providing the tunable colour by a single excitation wavelength of 365 nm in the mixed gels. These ge…
By applying the theory of thermally activated nucleation to the switching of ferroelectric domains, a method is developed to experimentally obtain the value of both the activation enthalpy, ΔH, and activation volume, V*, for the thermally activated process involved in ferroelectric switching. The method was applied to…
We have designed, synthesized and probed a dodecafluoro-subphthalocyaninato boron(III) unit, which bears a triphenylamine moiety in its axial position, as a novel electron donor-acceptor system.