Materials Literature
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The theoretical model taking into account interactions of a spin-crossover molecule with its two nearest neighbours has been applied to the data on spin crossover equilibria in a series of Fe(II) complexes with halogenated ethyltetrazoles. Transition curves of different shapes, varying from a gradual to a two-step and…
Microbiologically influenced corrosion (MIC) describes the largely negative influence that a microorganism can have on a material, with sometimes severe consequences for humans, nature, and the economy. Although the problem of MIC has been known for decades, work on this topic has been fragmented and isolated; interdi…
A 5,15,25-trialkynyl [28]hexaphyrin(1.1.1.1.1.1) is the main product of the boron trifluoride-catalysed condensation of meso-anthryl dipyrromethane and triisopropylsilylpropynal; it absorbs strongly in the near-infrared, out to 1093 nm.
Liposomes have raised considerable interest as drug carriers in cancer chemotherapy [1] given their ability to alter the biodistribution and control the release rate of encapsulated drugs. Their ve...
This communication describes a relatively new and simple method for the preparation of AgI nanowires using nanoporous alumina membrane templates which can be easily extended to prepare nanowires of many other materials.
Abstract 2‐Methacryloyloxyethyl phosphorylcholine (MPCE) was synthesized using phosphorus trichloride, ethylene glycol, 2‐hydroxyethyl methacrylate and triethylamine, and then used in the preparation of O ‐butyrylchitosan‐bonded MPCE (MPCE–BCS) by Michael addition of MPCE to amino groups of O ‐butyrylchitosan. The str…
As is well known, the Cr2+/SiO2 system is an efficient catalyst for ethylene polymerisation already at RT (even if in the industrial process the running temperature is ∼380 K). For this reason it is the ideal system for in situ spectroscopic investigations on a genuinely working catalyst (Adv. Catal., 2001, 46, 265).…
Advanced materials are targeting durability improvement in gas turbine engines. One general area of concern for durability is in the hot section components of the engine. Ceramic matrix composites offer improvements in durability at elevated temperatures with a corresponding reduction in weight for nozzles of gas turb…
An electrochemical method of preparing a high surface area nickel electrode by NiZn alloy formation and subsequent dealloying in (60-40 mol %) at 450°C was studied. A nickel electrode was kept at 0.22 V vs. Zn in where γ-NiZn alloy was formed, and then at 0.5 V where partial dealloying occurred to yield α-NiZn alloy.…
The generation of controlled metal alkoxide structures has been explored using 4,6-dihydroxypyrimidine (DHP-H2) as a selective bridging ligand. DHP-H2 was reacted with Ti(OPri)4 in pyridine (py). Crystallization from this solution led to the isolation of [(OPri)2(μ-OPri)Ti(μ-DHP)Ti(OPri)3(py)]2 (1). The two dinuclear…
An investigation of the behaviour of various calcined mesoporous silicas (MCM-41, MCM-48, SBA-15, HMS) in OH/surfactant/H2O systems, at room temperature or under hydrothermal (150 °C) conditions, has shown that their stability (i.e., whether or not they are dissolved) depends on the match between the pore channel stru…
Boron Nitride (BN) coating on sintered SiC fibers (Tyranno SA) by a continuous chemical vapor deposition (CVD) process was developed with the ultimate goal of controlling the interface in SiC/SiC composites. BN coating by a continuous CVD process was conducted at 1580°C under a pressure of approximately 1.3×102Pa. Rea…
Very stable copper(I) complexes were engineered from pyridine ligands bearing on one side an iminophenyl fragment and on the other a pivotal methyl group. The phenyl group was substituted in the para position either by a methoxy group or by a phenyl ester group grafted with three paraffin chains (n = 8, 12, 16). The m…
The optical properties of a-Se100-xSbx thin films (where x = 0, 0.5, 2.5, 5 and 10) have been studied in the wavelength range 540–900 nm. It was found that the optical band gap increases with increasing Sb concentration in the a-Se100-x Sb x system. The refractive index n decreases, while the extinction coefficient k…
It is well known that the sharpness of secondary recrystallized Goss texture ({110}‹001›) is deteriorated by nitriding primary recrystallized sheet on the ordinary grain oriented silicon steel. The cause of this deterioration was investigated. It was found that secondary recrystallization of Dispersed Goss ({110}‹229›…
C/C composites were bonded to nickel in a vacuum, using an RF-induction furnace, with joining temperature, keeping time and joining compressive stress as variables. C/C composites with different carbon fiber orientations and heat treatment temperatures were used. The bending strength of the C/C composite/nickel joints…
Supercritical fluids (SCFs) were used for tailoring the structures of micro- and mesoporous silica with uniform pore sizes, CnFSM-16 (n = 8, 10, 12 and 16), where the value n denotes the carbon atom number in the alkyl chain of the template surfactant. Silica precursors, tetraethylorthosilicate (TEOS) dissolved in sup…
The diameter and twist angle of cotton yarns and jute-blended yarns were assessed by an image analysis technique. The diameter of rotor-spun yarns does not follow the conventional Peirce's equation. The modified equation shows very good correlation (r = 0.97) with measured yarn diameter. The rotor-spun yarn is found t…
Cellulose is readily phosphorylated with phosphonic acid derivatives upon heating at elevated temperatures. In this paper, various properties of cotton fabrics phosphorylated with 1-hydroxyethylidene-1,1-diphosphonic acid, phenyl phosphonic acid, 2-carboxyeth ylphosphonic acid. and N-(phosphonomethyl)iminodiacetic aci…
Mesoscopic simulations are used to elucidate the fundamental effects of microstructural inhomogeneity in polycrystalline materials on grain-boundary diffusion creep (Coble creep). Considering two-dimensional model micro-structures with a distribution in the grain sizes and grain-boundary diffusivities, we determine th…