Materials Literature
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We report the sidewall functionalization of soluble HiPco single-walled carbon nanotubes (SWNTs) by addition of dichlorocarbene. The dichlorocarbene-functionalized SWNTs [(s-SWNT)CCl(2)] retain their solubility in organic solvents such as tetrahydrofuran and dichlorobenzene. The degree of dichlorocarbene functionaliza…
Quantum leap: Very high quantum yields, thought to be impossible for nanocrystalline phosphor materials, were achieved with CePO4:Tb/LaPO4 core–shell nanoparticles (see picture). Because the LaPO4 shell reduces energy losses at the particle surface, transparent colloidal solutions of these 8-nm particles are highly ph…
The insolubility of single-walled carbon nanotubes (SWNT) in either water or organic solvents has been a limitation for the practical application of this unique material. Recent studies have demonstrated that the suspendability of SWNT can be greatly enhanced by employing appropriate surfactants. Although the efficien…
Polyhydroxyalkanoates (PHAs) are biopolyesters composed of hydroxy fatty acids, which represent a complex class of storage polyesters. They are synthesized by a wide range of different Gram-positive and Gram-negative bacteria, as well as by some Archaea, and are deposited as insoluble cytoplasmic inclusions. Polyester…
Abstract Synthesis of second generation poly(benzyl ether) dendrimers having N3O porphyrin at its core and the first observation of large micro-meter sized spherical aggregates as confirmed by optical microscopy and AFM analysis are reported.
Abstract Paper samples of three different qualities were extrusion coated with low‐density polyethylene (LDPE) and high‐density polyethylene (HDPE). The morphological phases of the polyethylene layers have been quantified by 13 C solid‐state high‐resolution NMR. Shear forces in the process initiate the formation of th…
Simple equations of effective demagnetizing factors N x e and N y e for use in Kittel's ferromagnetic resonance (FMR) formula have been derived for the first time. The effective demagnetizing factors are derived from anisotropy energy ( G ) and a static field direction expressed by a spherical coordinate system (θ,φ).…
Amorphous, as-deposited Nd–Fe–B films prepared by RF-sputtering were annealed by irradiating pulsed KrF excimer laser (248 nm). A pulse of 20 ns in width and 4 kJ/m 2 in power density was irradiated onto a 2 µm-thick as-deposited film kept at 400°C. It is observed that, by a single shot of the pulse, Nd 2 Fe 14 B Φ ph…
Highly ordered vanadium–iron cyanide molecular magnet nanowire arrays have been prepared for the first time using an electrodepositing technology with two-step anodized anodic aluminium oxide films. Selectable diameters and lengths of the nanowires can be obtained by controlling the diameters of the nanopores in the a…
Carbon-coated Co and Ni nanocrystallites were effectively synthesized by an AC arc discharge method under an N 2 atmosphere with yields over 80%. The metal content of as-made Co and Ni samples was determined by a thermogravimetric method and it was found that the metal content increased by raising the metal loading ra…
Conducting polypyrrole nanotubes are synthesized by an oxidation polymerization technique using an Anodisc alumina membrane as a template. The morphology is varied from solid rod-like structures to hollow tubes by changing the concentration of the ammonium persulphate (used as the oxidant) solution. The current distri…
Abstract The condensation reaction product of poly(lactic acid) (PLA) and a hydroxyl‐terminated four‐armed poly(ε‐caprolactone) (PCL) was studied by size‐exclusion chromatography, DSC, and NMR. The use of both L ‐lactic acid (LLA) and rac ‐lactic acid ( rac ‐LA) was studied and the use of two different catalysts, stan…
Abstract Molecules having hydrophobic and hydrophilic groups such as 4-n-heptylaniline and 4-nonylphenol, an endocrine disrupter, fit the organic–inorganic nanostructure in alkyl-grafted MCM-41, interacting with the inorganic walls as well as the organic moiety, and thus the adsorbent achieves high molecular adsorptio…
Abstract New toughened poly(butylene terephthalate) (PBT) materials were obtained by melt blending with 20 wt % poly(ethylene octene) (PEO) copolymer and different levels of a difunctional epoxy resin in a twin‐screw extruder followed by injection‐molding. The presence of neither PEO or epoxy influenced either the pha…
A 340-element array of microhotplates was used to characterize the chemical vapour deposition growth of carbon nanotubes and nanofibres under a variety of process conditions. One dimension of the 17 by 20 element array was used to vary the thickness of a Ni catalyst layer. The second dimension was used for temperature…
Abstract A novel bisthienylethene as yellow colour photochromic and acidichromic dye has been prepared by a simple and low cost route, and its PC film shows a fast response reversible colour change between colourless and yellow colour by exposure to gaseous acid and ammonia.
We have studied the electronic properties of $2H\ensuremath{-}{\mathrm{WSe}}_{2}$ intercalated with Cu using the full-potential linear-augmented plane-wave method as implemented in the WIEN97 code. Intercalating $2H\ensuremath{-}{\mathrm{WSe}}_{2}$ with Cu changes the electronic behavior from semiconducting to metalli…
Abstract A metal chelate polymer (MCP) of PVAc‐AgNO 3 was prepared by adding AgNO 3 salts into the PVAc matrix and was coated on to PET substrate to form PVAc‐AgNO 3 /PET films. These films were then treated with NaBH 4 aqueous solution to become the reduced metallized conductive films (RMCF) of PVAc‐AgNO 3 /PET. The…
The displacement of an oxygen atom in pure alpha quartz is studied via first-principles molecular dynamics. The simulations show that when an O atom in a Si-O-Si bridge is moved away from its original equilibrium position, a new stable energy minimum can be reached. Depending on the spin state and charge Q of the syst…
Abstract Phase morphology of polymer blends PP/COC, where PP is polypropylene and COC is a copolymer of ethene and norbornene, was characterized by means of scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM). PP/COC blends were prepared by injection molding and their morphology was…