Materials Literature
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The full parameter space of the transition from Townsend to glow discharge is investigated numerically in one space dimension in the classical model: with electrons and positive ions drifting in the local electric field, impact ionization by electrons ($α$ process), secondary electron emission from the cathode ($γ$ pr…
Random walk models in one-dimensional disordered media with an oscillatory input current are investigated theoretically as generic models of the boundary perturbation experiment. It is shown that the complex admittance obtained in the experiment is not self-averaging when the jump rates $w_i$ are random variables with…
We discuss the key steps that have to be followed to calculate coherent quantum transport in molecular and atomic-scale systems, making emphasis on the ab-initio Gaussian Embedded Cluster Method recently developed by the authors. We present various results on a simple system such as a clean Au nanocontact and the same…
Multilayer ceramic capacitor (MLCC) production and sales figures are the highest among fine-ceramic products developed in the past 30 years. The total worldwide production and sales reached 550 billion pieces and 6 billion dollars, respectively in 2000. In the course of progress, the development of base-metal electrod…
Catalysis is one of the most important technologies in the industrial world, controlling more than 90% of industrial chemical processes and essential for large-scale production of plastics and fuel. Exploring the most common type of catalysis used in industry, Electron Microscopy in Heterogeneous Catalysis provides a…
IM5 is a recently discovered zeolite that presents a high hydrothermal stability and, when exchanged with cobalt, shows a high activity for the selective catalytic reduction of NO with propane. The catalytic behavior of a cobalt-exchanged IM5 zeolite is compared with that of a cobalt-exchanged ZSM5 zeolite. The state…
(2,5)-Ene reactions catalyzed by mesoporous solid acids are reported from the mechanistic point of view. The continuum (2,5)-ene mechanism from the concerted to the cationic cyclization followed by 1,2-hydride shift is evaluated. The solid-acid-catalyzed cyclization of the oxonium ion intermediate 4 derived from cycli…
A novel technique, which allows the importance of ion energy in plasma polymer film growth to be investigated, without perturbation of any other plasma parameter (particle densities or temperatures) or, in principle, perturbation of particle (neutral or ion) fluxes is applied in the plasma polymerisation of acrylic ac…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSectorization of a Lamellar Polymer Crystal Studied by Dynamic Monte Carlo SimulationsWenbing Hu, Daan Frenkel, and Vincent B. F. MathotView Author Information FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ A…
A series of silver carboxylates containing unsaturated groups within the ligand have been synthesised [AgO2CR, R = CH2CN (1), H2CCH (3), H2CCHCH2CH2 (5), Me(H)CC(Me) (8), Ph(H)CCH (11)], along with their triphenylphosphine [AgO2CR(PPh3)2, R = CH2CN (2), H2CCH (4), H2CCHCH2CH2 (6), Me(H)CC(Me) (9), Ph(H)CCH (12)] and 1…
A hexadentate ligand LH2 (LH2 = 1,2-bis((3-methoxysalicylidene)amino)ethane) reacts with iron(III) ions to yield a μ-oxo complex (LFe)2O, 1, which may function as a ligand towards gadolinium(III). The resulting product is a tetranuclear complex [LFeGd(NO3)3]2O, 2. Its structure has been determined by single crystal X-…
Homogeneously dispersed bimetallic oxides in nanocrystalline or amorphous forms, of the type MAl2O4 (where M = Mg, Ca, Mn, Co, Fe, and Zn) were prepared from bimetallic oxo-bridged alkoxides [(RO)2Al–O–M–O–Al(OR)2], where the Al–O–M–O–Al bonds were not hydrolytically cleaved. This approach yields hydroxides [(HO)2Al–O…
Layered organic superconductors situated in the vicinity of a superconductor-insulator (SI) phase boundary show switching between the SI bistable states by application of magnetic field. First, we show that an electronic phase of $\ensuremath{\kappa}\ensuremath{-}(\mathrm{BEDT}\ensuremath{-}\mathrm{TTF}{)}_{2}[\mathrm…
Two new noncentrosymmetric (NCS) solids were isolated via high-temperature, salt-inclusion reactions, Cs(2)Cu(7)(P(2)O(7))(4).6CsCl (1, CU-9) and Cs(2)Cu(5)(P(2)O(7))(3).3CsCl (2, CU-11). These copper(II) phosphates exhibit novel open-framework structures conceptually templated by extended Cs-Cl salt. The latter resid…
Only about half of non-membrane-bound proteins encoded by either bacterial or archaeal genomes are soluble when expressed in Escherichia coli (Yee et al., Proc Natl Acad Sci USA 2002;99:1825-1830; Christendat et al., Prog Biophys Mol Biol 200;73:339-345). This property limits genome-scale functional and structural pro…
The controlled colour generation and colour erasing phenomena of alkylammonium polyoxomolybdate complexes were first observed in the trans-(1R,2R)-1,2-bis(undecylcarbonylamino)cyclohexane organogel system using the sol-gel phase transition.
Static lattice simulation techniques were used to calculate the energetics of intrinsic defect generation, impurity incorporation and cation migration in the perovskite oxide LaGaO3. The calculations indicate that the formation of cation vacancies is energetically favoured over the formation of cation interstitials; e…
Structural analyses have been undertaken with the monoclinic and orthorhombic crystalline structures of polyester 4 6. X-ray diffraction patterns performed at 50 °C and electron diffraction patterns from single crystals, solution-grown films, and epitaxial crystallizations have been considered. Skew CH 2 CH 2 −OC(O) b…
The synthesis of a double-cavity porphyrin with interesting allosteric binding properties toward viologens (N,N'-disubstituted 4,4'-bipyridines) is described. The porphyrin host forms very strong 1:2 complexes with viologens, displaying a negative allosteric behavior. The first viologen guest binds exceptionally tight…
Oxochromium(V) complexes of 5,10,15-tris(pentafluorophenyl)corrole and brominated derivatives oxygenate substrates (triphenylphosphine and norbornene) with concomitant production of chromium(III). Regeneration of CrVO by reaction of dioxygen with CrIII completes an aerobic catalytic cycle, with very large solvent effe…