Materials Literature
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High surface area conducting polymers with nanoscale dimensions are an important aim for device applications. Here is reported the polymerization and electrochemical oxidation of aniline at multiwalled carbon nanotube electrodes. Polyaniline films formed on these nanotube whiskers are oxidized more easily and produce…
Density functional theory and continuum dielectric methods have been employed to evaluate the free energy of successive aqua-substitution reactions: [Mg(H 2 O) 6- m - n L m L‘ n ] 2+ mz + ny + L z → [Mg(H 2 O) 5- m - n L m +1 L‘ n ] 2+( m +1) z + ny + H 2 O. The ligands L z or L‘ y under consideration are simple organ…
This paper discusses several materials aspects which are important in the development and optimisation of Al2O3:C for both thermoluminescence and optically stimulated luminescence applications, including aspects of crystal growth, luminescence spectra, trap energy distributions and general dosimetric properties.
A simple methodology has been developed to enable a greater enhancement of fluorescence from europium (Eu 3+ )-doped silica gels containing adsorbed silver (Ag) islands. The procedure involves the preparation of Eu 3+ -doped silica gels by a sol−gel method and then immersion in a Ag sol for ca. 48 h to allow the adsor…
▪ Abstract Heat conduction in novel electronic films influences the performance and reliability of micromachined transistors, lasers, sensors, and actuators. This article reviews experimental and theoretical research on heat conduction in single-crystal semiconducting and superconducting films and superlattices, polyc…
Diffuse X-ray scattering from single crystals of metamict zircon reveals residual crystallinity even at high fluences (up to 7.2 × 10 18 α-decay events/g). The experimental evidence does not suggest that radiation-induced amorphization is a “phase transition.” The observations are in good agreement with a nonconvergen…
We study the preparation and capping of silver nanoparticles by several unsaturated long-chain carboxylates. UV−visible and FTIR spectroscopy and high-resolution electron microscopy are used to characterize the effect of the chain length, its configuration, and the degree of unsaturation on the size distribution of th…
The dynamic contact angle formed when a liquid curtain impinges onto a moving solid is measured for aqueous glycerol solutions in different flow regimes. It is usually assumed that the dynamic contact angle is simply a function of the contact-line speed and the material properties of the contacting media. The new resu…
Vanadium oxide nanotubes were prepared in a modified sol‐gel reaction of vanadium oxide triisopropoxide conducted in the presence of the structurally directing hexadecylamine and followed by hydrothermal treatment. The tubes consist of concentric shells of highly crystalline vanadium oxide separated by alternating org…
A new and general way to prepare porous metals with highly ordered 3D arrays of void spaces is reported here. The technique involves filling the spaces between colloidal crystals in a 3D array with a metal ion solution, and removing the solvent to produce a salt skeleton. The skeleton then undergoes chemical transform…
Polyelectrolytes are macromolecules which carry a large quantity of ionizable groups along their chains. By dissolving them in suitable solvents, for example water, these groups dissociate in highly charged macroions and an equivalent quantity of low-molecular counter ions. Through the connection between polymer and e…
The application of the viscous analogy, known as the Hele-Show model, for seepage investigation is demonstrated in the paper. The changes in the viscous properties of the model fluid (glycerine) resulting from the changes of the atmospheric conditions - temperature and humidity, have been taken under consideration as…
Based on a recently introduced generalized mixing rule, which contains the results of the reptation and double reptation model as special cases, it is possible to determine the molecular weight distribution (MWD) from rheological data. By evaluating data from bimodal PS-mixtures Maier et al. (1998) have shown how the…
Cu-Ni castings and wrought pipes nominally contain 1% Fe to 2% Fe, which is added to improve the Cu-Ni alloy’s erosion-corrosion resistance. After fabrication, Cu-Ni products are solution heat-treated to dissolve the iron uniformly and form a single-phase alloy. During welding, however, iron can precipitate from solid…