Materials Literature
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The polymer poly(vinylidene fluoride) (PVDF) was irradiated with X-rays produced by a nonmonochromatic (MgKα) source and the structural and electronic PVDF surface modifications were studied by X-ray photoelectron spectroscopy (XPS). Changes in the shape and intensity of the C1s and F1s lines show that a PVDF degradat…
(2,3,9,10,16,17,23,24-Octahydroxyphthalocyaninato)nickel(II) (NiPc(OH) 8 ) has been prepared by demethylation of (octamethoxyphthalocyaninato)nickel(II). Silylation of peripheral oxygen atoms using dimethyl- tert -butylsilyl chloride gave NiPc(OSi( t -Bu)Me 2 ) 8 as a convenient precursor to NiPc(OH) 8 with high solub…
In a normal Fermi liquid, Landau's theory precludes the loss of single-fermion quantum coherence in the low-energy, low-temperature limit. For highly anisotropic, strongly correlated metals, there is no proof that this remains the case, and quantum coherence for transport in some directions may be lost intrinsically.…
Cs 2 Hg 3 M 2 S 8 (M = Ge, Sn) were synthesized in 70% and 65% yields by reacting HgS, and Sn or Ge, in molten Cs 2 S x at 520 °C. Rb 2 Hg 3 Sn 2 S 8 and Rb 2 Hg 3 Ge 2 S 8 were synthesized in 42% and 73% yield by reacting the same reagents in molten Rb 2 S x at 350 °C. Cs 2 Hg 3 M 2 S 8 crystallize in the triclinic s…
Crystal structures are reported for the following complexes [Fe 3 O(OOCCMe 3 ) 6 (py) 3 ]ClO 4 ·0.5py, 1; [Mn 3 O(OOCCMe 3 ) 6 (py) 3 ]ClO 4 ·MeCN, 2; [Mn 3 O(OOCCMe 3 ) 6 (py) 3 ], 4; [Fe 3 O(OOCCMe 3 ) 6 (py) 3 ], 5. Crystal data are as follows: 1, system monoclinic, space group P 2 1 / n, a = 11.658(5) Å, b = 35.45…
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…