Materials Literature
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Mesoporous silica materials containing functionalized organic monolayers have been synthesized. Solid-state nuclear magnetic resonance suggests that a cross-linked monolayer of mercaptopropylsilane was covalently bound to mesoporous silica and closely packed on the surface. The relative surface coverage of the monolay…
Charge drift methods have recently been developed for use in field problems as an alternative to satisfying the charge continuity equation. Here they are applied to hyperboloidal point–plane geometry in order to obtain analytic forms for the DC charge and planar current distributions beneath a coronating point. The ch…
The very low conductivities of modern insulating materials do not permit the dissipation of accumulated space charge. Space charge can therefore persist both within the bulk of an insulator and on its surface for long periods of time. This can lead to regions of intense electric field in the surrounding dielectric, pr…
Methods that have been used to evaluate the performance of UHF couplers for partial discharge monitoring of gas-insulated substations are briefly reviewed, illustrating the need for a standard test procedure. A measurement scheme is proposed in which the coupler is mounted beneath an aperture in a ground plane and sub…
The electron-phonon interaction in $C_{70}$ anions is studied by making use of a lattice relaxation approach. We find there exists a Jahn-Teller effect in $C_{70}^{3-}$ system, due to an extra electron being doped to the double degenerate $E_{1}^{''}$ state. As a result of this effect, the original $D_{5h}$ symmetry o…
We develop a numerical method for examining complex morphologies in thin films of block copolymer using self-consistent field theory. Applying the method to confined films of symmetric diblock copolymer, we evaluate the stability of parallel, perpendicular, and mixed lamellar phases. In general, lamellar domains forme…
The torus parametrization of quasiperiodic local isomorphism classes is introduced and used to determine the number of elements in such a class with special symmetries or inflation properties. The method is explained in an illustrative fashion for some widely used tiling classes with golden mean rescaling, namely for…
The thermoelectric properties of La-filled skutterudites are discussed from the point of view of their electronic structures. These are calculated from first principles within the local density approximation. The electronic structure is in turn used to determine transport related quantities. Virtual crystal calculatio…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
A selective electrodeposition method for the fabrication of extremely thin and long metallic and magnetic wires and other nanostructures is introduced. Growth is done on the cleaved edge of a semiconductor multilayer structure incorporating a 4 nm wide modulation doped quantum well. This conducting quantum well is con…
The tumbling dynamics of the ${\mathrm{NO}}_{3}^{\ensuremath{-}}$ anions in C${\mathrm{a}}_{0.4}$${\mathrm{K}}_{0.6}$(N${\mathrm{O}}_{3}$${)}_{1.4}$ liquid have been studied close to its glass transition $({T}_{g}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}333\mathrm{K})$ by ${}^{15}$N wide line NMR spectroscop…
We report an ellipsometric study of the free surface of a smectic liquid crystal possessing a smectic- $A$--to--isotropic phase transition. Approaching the transition from above, an ordered surface layer appears at a discontinuous transition one degree above the bulk transition temperature. With decreasing temperature…
An in situ x-ray diffraction study of room-temperature compression of rhombohedral boron nitride (rBN) was performed up to 10 GPa. Although no phase transformation of rBN was observed in a liquid pressure transmitting medium, the structure of rBN changed to become disordered within the layered stacking sequence at les…
Studies of epitaxial films on substrates with a range of lattice constants reveal two dominant contributions to the occurrence of colossal negative magnetoresistance (CMR) in these manganites: at high temperatures ( , being the Curie temperature), the magnetotransport properties are predominantly determined by the con…
ZnS:Cu nanocrystals were synthesized in polymeric networks. X-ray photoemission spectroscopy and atomic absorption data show that the Zn and Cu ion mass contents were about 8.2% and 0.12%, respectively. The particle size of ZnS:Cu nanocrystals was about 3.0 nm, measured by UV-vis spectrum. Due to the quantum size effe…
The temperature dependence of the upper critical magnetic field ${H}_{c2}(T)$ in the quasi-one-dimensional molecular superconductor (TMTSF${)}_{2}$P${\mathrm{F}}_{6}$ was determined via resistivity, for the intrachain (a), interchain (b), and interplane $({\mathbf{c}}^{*})$ directions. For H along a and b, ${H}_{c2}(T…
The possibility of thermodynamic correlation of partial and saturation swelling of styrene-acrylonitrile (SAN) copolymer particles by styrene (St) and acrylonitrile (AN) monomers is investigated. The unknown Flory-Huggins interaction parameters involved in the thermodynamic swelling equations are estimated by fitting…
Cooperative upconversion processes and Yb-Er energy transfer efficiencies in high Er concentration phosphate glasses were studied. The cooperative upconversion coefficients were deduced from the pump intensity dependence of luminescence decay curves. Cooperative upconversion coefficients of <SUP>4</SUP>I<SUB>13/2</SUB…
The organic template within molecular sieves may readily be studied by FT–Raman spectroscopy with virtually no interference from bands due to framework vibrations. FT‐Raman spectra show that morpholine and cyclohexylamine are in the protonated form within AlPO 4 ‐based materials with the chabazite structure, while spl…
Surface modification of poly(p-phenylene terephthalamide) (PPTA) film by a remote oxygen plasma treatment has been investigated from a viewpoint of comparison with a direct oxygen plasma treatment. We call the modification procedure in a space far away from the oxygen plasma zone “the remote oxygen plasma treatment,”…