Materials Literature
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We describe the synthesis, characterization and properties of the first optically-active 1,3-unsymmetrically disubstituted ferrocene derivative which is to exhibit smectic C* and smectic A* phases.
Living ω-aluminum alkoxide poly-ϵ-caprolactone and poly-D,L-lactide chains were synthesized by the ring-opening polymerization of ϵ-caprolactone (ϵ-CL) and D,L-lactide (D,L-LA), respectively, and were used as macroinitiators for glycolide (GA) polymerization in tetrahydrofuran at 40 °C. The P(CL-b-GA) and P(LA-b-GA) d…
The corrosion behaviour of a range of austenitic and duplex stainless steels has been studied in sea water containing sulphate reducing bacteria under conditions where the influence of an external aerated steel surface is absent. By means of a combination of anodic polarisation, cathodic polarisation, galvanic couplin…
Molecular transport of aromatic hydrocarbons through nylon/ethylene propylene rubber (EPR) blend has been investigated in the temperature range of 25 to 65 °C. The effect of blend ratio on the transport behavior was studied in detail. Nylon/EPR-50/50 blend shows the lowest uptake among all the systems studied. This be…
The paper deals with the determination of synchronous machine parameters using a 2D Finite Element Method â FEM (Flux2D- Cedrat). Simulations of no-load sudden three phase short- circuits are performed in rotation, the saturation effects and the eddy currents in the rotor solid iron parts are also taken into account…
Morphology development during isothermal crystallization in equal molecular weight isotactic polypropylene (iPP) and atactic polypropylene (aPP) blends was studied with time-resolved simultaneous small-angle X-ray scattering (SAXS) and wide-angle X-ray scattering methods with synchrotron radiation. The final long peri…
Abstract: A simple model of charge ordering is considered. It is shown explicitly that at any deviation from half-filling ($n neq 1/2$) the model is unstable with respect to phase separation into charge ordered regions with $n = 1/2$ and metallic regions with smaller electron or hole density. The model is extended to…
In this study we analyse the structure and composition of the periphyton, upstream and downstream of a fish farm located at an Andean stream. The effluents discharges large quantities of phosphorus and organic matter from the feed remnants and the faeces. The input of organic matter caused a reduction in algal biomass…
Polyhydroxyalkanoate(PHA) is a family of carbon and energy storage materials synthesized by many bacteria,its hydroxyalkanoate monomers have diversified structures.A broad screening process using the FT\|IR technique developed by us previously was carried out.Samples were collected from various geological locations ar…
Two-dimensional x-ray diffraction (XRD 2 ) refers to x-ray diffraction applications with twodimensional (2D) detector and corresponding data reduction and analysis. The two-dimensional diffraction pattern contains far more information than a one-dimensional profile collected with the conventional diffractometer. In or…
Exhaustive extraction of poly(ether ketone) (PEK) with hot chloroform affords a novel range of cyclic oligo(ether ketone)s. The proportion of cyclic material extracted in this way ranged from as high as 13% for laboratory-synthesised PEK to as low as 2% for an industrial development-grade polymer. Extracts were charac…
Abstract Photon-initiated shape transformation of n-alkanethiol-derivatized noble metal nanoparticles has been studied with variations of metal, alkanethiol, and solvent. Silver nanoparticles undergo fragmentation upon irradiation while gold ones barely do. Silver/gold composite particles follow the case of silver wit…
Ruthenium tetroxide (RuO4) is a versatile agent for imparting mass density contrast to saturated hydrocarbon polymers. We have successfully employed RuO4 to examine the microdomain and crystallite morphologies of poly(ethylene-block-vinylcyclohexane) semicrystalline–glassy diblock copolymers via transmission electron…
Mullite whiskers and anisotropic grains that were derived from erbia‐doped aluminum hydroxide–silica gel were studied. Firing 3.0‐mol%‐erbia‐doped isostatically pressed pellets at 1600°C for 1.0–8.0 h resulted in a high surface concentration of mullite whiskers. Their c ‐axes were aligned preferentially along the pell…
The controlled release of citronellal and menthone from α-keto esters was tested in different household and bodycare applications by photochemical irradiation of these esters with artificial light sources or natural sunlight. Quantitative dynamic headspace analyses carried out with different application bases, such as…
The structural properties of Ru(0001) surfaces after various electrochemical treatments were investigated by ex-situ electron diffraction [low-energy electron diffraction (LEED)/reflection high-energy electron diffraction (RHEED)] and Auger spectroscopy experiments in conjunction with cyclic voltammetry. At potentials…
The Mac Donald-type 2 + 2 condensation of the readily available 5-mesityldipyrromethane with acenaphthenequinone leads to the trans (syn and anti) porphodimethenes, respectively, which, after treatment with KOH or NaOMe in THF and subsequent oxidation with air, yield the corresponding trans-8-carboxynaphthylporphyrins…
The liquid crystalline properties of a series of ionic silver complexes [Ag(NH2n-CnH2n+1)2]X (X = NO3, n = 6, 8, 10, 12, 14; X = BF4, n = 8, 10, 12, 14), derived from silver nitrate or tetrafluoroborate and aliphatic amines, have been investigated by optical microscopy, DSC, and X-ray diffraction. The materials exhibi…
A new method of probing surface–surface interactions and calculating attachment energies for morphology predictions, based on the interactions between an infinite surface and a thin finite slice (a nano-crystallite), has been implemented in the ORIENT program package. This, together with existing capabilities for stud…
Significantly prolonged survival rate was obtained for the first time using carcinoma mice models after the administration of single-component liposomes of dimyristoylphosphatidylcholine (DMPC) without any drug. An increase in lymphocytes under optical microscope was observed without any increase in the neutrophils co…