Materials Literature
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Part 1 Conductive polymers: polyanaline as a corrosion barrier optimization of electrical and redox properties of electrogenerated polypyroles heterocycle-based electroconductive polymers electrochemical characteristics of conducting polymers anisotropy in electrically conducting polymers basic methods of synthesis an…
The Sudden Approximation (SA) for scattering of atoms from surfaces is generalized to allow for double collision events and scattering from time-dependent quantum liquid surfaces. The resulting new schemes retain the simplicity of the original SA, while requiring little extra computational effort. The results suggest…
LOS ANGELES—Refrigerator magnets are best known for holding shopping lists and old postcards onto refrigerator doors. But in a few years, much more powerful magnets could be the key to keeping food cold in so-called magnetocaloric refrigerators, which would be more energy efficient and less polluting than standard mod…
In this paper, we argue that, in 2-d, the weak localisation of bosons, which occurs on the insulating side of the superconductor-insulator transition, is characterised by $ρ\sim ln(1/T)$, as compared to $σ\sim lnT$ for fermions. Such an unconventional behaviour is tied to the diffusion pole of the delocalised (unconde…
A third generation replication machine has been developed to allow mass production of high quality holograms using DuPont holographic recording films. Improved coupling methods of film to the flat-plate masters are described. The operating features and production capabilities of this machine are discussed. An example…
The photochemical phase-transition behavior of polymer liquid crystals (LCs) containing azobenzene moieties with strong donor−acceptor substituents has been investigated. Copolymers of a mesogen and a donor−acceptor azobenzene were prepared. Photoirradiation of a thin film of the polymer LCs (100−200 nm thickness) in…
The phase behavior of poly(ethylene- alt -propylene)- block -poly(ethylene- co -butylene)- block -polystyrene triblock copolymers with different polystyrene block lengths is investigated by dynamic mechanical analysis, transmission electron microscopy, and small-angle X-ray scattering. While the corresponding poly(eth…
Abstract In the most general sense, matrix isolation comprises a range of experimental techniques in which guest molecules or atoms are trapped in rigid host materials. The trapped species are prevented from diffusing, and cannot therefore undergo any bimolecular reactions, except with the host (Fig. 1.1). The host ma…
The [Pd7As10S22]4- molecule assembles under hydrothermal conditions from Pd2+ and [AsS3]3- to adopt the unusual shape of a gondola. Key to its formation appears to be the creation of direct Pd−As bonds.
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTMesogen Orientation within Smectic C* Side Chain Liquid Crystalline Diblock CopolymersWen-Yue Zheng, Ramon J. Albalak, and Paula T. HammondView Author Information Department of Chemical Engineering, Massachusetts Institute of Techno…
Three series of SiC/AlN samples were prepared by pyrolysis of “poly(aluminosilazane)”, the product of the reaction between hexamethylcyclotrisilazane and triethylaluminum. The Si/Al ratio was varied for one series (with constant pyrolysis temperature) and the pyrolysis temperature was varied for the other two series,…
The self-assembly of CdS semiconductor nanocrystals (Q-CdS) as well-defined monolayer and multilayer films on glass, indium tin oxide, and gold surfaces was carried out. These were characterized by ultraviolet−visible spectroscopy, ellipsometry, and scanning tunneling microscopy. The adsorption of the polymeric anion…
Antiferromagnetic exchange constants were calculated by using the Mulliken−Hush treatment for metal−ligand coupling elements ( J. Photochem. Photobiol. A: Chem. 1994, 82, 47) and the valence bond model of antiferromagnetic exchange ( Inorg. Chem. 1993, 32, 2850), from the spectral data of the solvent-dependent ligand-…
The influence of the composition and thermal history on the type of lattice developed has been studied by wide-angle X-ray diffraction measurements in three vinyl alcohol−ethylene, VAE, copolymers with different compositions, which were crystallized from the melt at various cooling rates. The results are compared with…
Propagation of an ultrasonic wave in a water generates the cavitation bubbles, which behaving like microreactors are the center of a high-energy phenomenon leading to destruction of organic pollutants. In this work, a comparative study conducted with chlorobenzene and 4-chlorophenol as models for hydrophobic and hydro…
The intermetallic compound Fe2VAl looks non-metallic in transport and strongly metallic in thermodynamic and photoemission data. It has in its band structure a highly differentiated set of valence and conduction bands leading to a semimetallic system with a very low density of carriers. The pseudogap itself is due to…
Tight-binding (TB) molecular dynamics (MD) has emerged as a powerful method for investigating the atomic-scale structure of materials --- in particular the interplay between structural and electronic properties --- bridging the gap between empirical methods which, while fast and efficient, lack transferability, and ab…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTImprovement of Starch Film Performances Using Cellulose MicrofibrilsAlain Dufresne and Michel R. VignonView Author Information Centre de Recherches sur les Macromolécules Végétales (CERMAV-CNRS), Université Joseph Fourier, BP 53, F-…
Hydrothermal-wave instabilities in thermocapillary convection are known to produce undesirable effects when they occur during the float-zone crystal-growth process, and perhaps in other situations. Suppression of the hydrothermal-wave instability produced in the model system of Part 1 (Riley & Neitzel 1998) is dem…
The influence of the protein on the nonplanarity of the macrocycle for nickel(II)-reconstituted cytochrome c (NiCyt-c) has been investigated with pH-dependent resonance Raman and UV-visible absorption spectroscopy and molecular mechanics calculations. The spectra reveal that NiCyt-c near neutral pH has axially coordin…