Materials Literature
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The influence of cellular surface hydrophobicity on the adherence capacity to plastic of Candida albicans was investigated at two culture temperatures (37 and 22 degrees C). The majority of the 42 strains studied were hydrophobic at 22 degrees C and hydrophilic at 36 degrees C. The hydrophobic cells showed a consisten…
Ab-initio X-ray powder diffraction (see cover for typical spectra) is shown to be a powerful structural tool for (i) insoluble, thermally unstable, compounds which cannot be (re)crystallised from solution or from the melt; (ii) metastable phases destroyed or modified upon manipulation; (iii) twins; (iv) very small cry…
The creation of electrical contacts between selected copper rings on a commercial circuit board by a novel method is reported. The method relies on spatially coupled electrodissolution and electrodeposition mediated by an electric field, followed by electroless deposition. The Figure shows an example of a conductive w…
Inductively coupled, radiofrequency-induced plasmas of allyl alcohol, operated at low electrical power (1–8 W), have been investigated using mass spectrometry (MS) and deposition rate measurements. The solid, plasma polymer product was collected on silicon substrates and analysed by X-ray photoelectron spectroscopy (X…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTEthyne-Linked Cyclic Porphyrin Oligomers: Synthesis and Binding PropertiesAnton Vidal-Ferran, Zöe Clyde-Watson, Nick Bampos, and Jeremy K. M. SandersView Author Information University Chemical Laboratory, Lensfield Road, Cambridge CB2 1EW, U.K. Cite this: J. Org. Chem.…
The techniques of X-ray powder diffraction and solid-state magic angle spinning (MAS) 23 Na, 27 Al, and 31 P nuclear magnetic resonance (NMR) spectroscopy have been combined to investigate the speciation in a series of glasses and glass ceramics of general formula (P 2 O 5 ) 0.45 (CaO) 0.24 (Na 2 O) 0.31-x (Al 2 O 3 )…
A one-dimensional material model of lead magnesium niobate (PMN) is presented. The model includes saturation phenomenology, but excludes hysteresis and dispersion. (Constant temperature is assumed.) It is shown that the strain can be taken to respond as an exactly quadratic function in the electric displacement D thro…
Hydroxyphenyl-substituted metalloporphyrins have been electropolymerized as films onto ITO substrates. An ether bond between the phenyl rings of two monomers links the porphyrin units, leaving the porphyrin macrocycles undisturbed. During electrochemical oxidation of the films using a 0.0−0.9 V potential window, a sin…
It is a well known fact that PD (partial discharge) affects the lifetime and the deterioration rate of an insulation. Research work has shown that a mixture of magnitudes and frequencies of PD may appear, depending on the type of the applied voltage, its frequency, the electrode arrangement, the type of the insulation…
The sensitivity of a porous silicon Schottky barrier photodetector is much improved through rapid thermal oxidation and rapid thermal annealing processes. Under our optimum preparation conditions, photocurrent can reach about 21 mA (under 22.4 mW/cm/sup 2/ tungsten lamp illumination) and dark current is about 5.4 /spl…
A test setup able to accommodate dish shaped electrodes for gaps up to /spl sim/20 cm is being used to study large gap effects. This experiment, in connection with other authors' experiments, underlines the three more characteristic aspects of the large gap case: a voltage effect, a current effect and a gas effect. Th…
The frequency dependent polarizability α(– ω σ; ω1) and the frequency dependent first hyperpolarizability β(– ω σ; ω1, ω2) have been calculated using both self consistent field (SCF) and multiconfigurational SCF (MCSCF) linear and quadratic response functions for six small molecules: BH, CO, HF, H2O, NH3, and H S. Two…
A physically based model for the evolution of dry, two-dimensional foams based on a combination of mass transfer, vertex movement, and edge relaxation, enables efficient and accurate simulation with and without wall rupture. The stochastic nature of topological transitions due to numerical error has been carefully exa…
The octasubstituted oxo(phthalocyaninato)titanium(iv) complexes TiO[Pc′(CH2OC5H11)8 ] (Pc′=2,3,9,10,16,17,23,24-octasubstituted phthalocyaninate) and TiO[Pc″(OC4H9)8 ] (Pc″=1,4,8,11,15,18,22,25-octasubstituted phthalocyaninate) and the first 2,3,-naphthalocyaninato titanium complex TiO[Nc′(C6H13)8 ] (Nc′=2,5,11,14,20,…
The kinetics of weak gelation is modelled as a system of spherical particles interacting with sticky hard-sphere pair potentials. Gradual cross-linking of primary particles to form disordered non-close-packed aggregates of greater total excluded volume than the separate non-bonded primary particles leads to a steady i…
The presence of metal particles within a gas-insulated switchgear (GIS) might initiate a sparkover and lead to fatal failure of an electric power transmission system. In order to investigate the behavior of a particle in a GIS, the model electrodes and the measuring system are constructed. The motion of a particle was…
The reoxidation process in highly Ce 3+ ‐doped BaTiO 3 ceramics was studied using TEM. Samples of two different types of solid solutions, Ba 1−X Ce 3+ X Ti 1−X/4 ( V Ti ) X/4 O 3 and Ba 1−X Ce 3+ X Ti 4+ 1− X Ti 3+ X O 3 , were prepared by sintering oxide mixtures in air and in a reducing atmosphere, respectively. T…
Some of the fundamental properties of the reactive semiconductor–electrolyte interface are outlined and possibilities for electrochemical modification of semiconductor surfaces are discussed. The present status of investigating the physicochemical and morphological changes after (photoelectrochemical) processing is re…
Current consumer demands have led to increased interest in subjective evaluation of textile properties, but their assessment is often carried out by using techniques which cannot be justified as strictly valid. Tests in which a standard comparison is available are usually more likely to correlate well with objective m…
Cerium dioxide is a rare earth oxide material that can be useful in various optical and electronic applications because of its high refractive index and its dielectric constant. The purpose of this study was to conduct an x-ray photoelectron spectroscopy analysis of sputtered cerium dioxide thin films. The thin films…