Materials Literature
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A series of polyesters was synthesized by the bulk polycondensations of the respective combinations of three stereoisomeric 1,4 : 3,6-dianhydrohexitols [1,4 : 3,6-dianhydro-D-glucitol (1), 1,4 : 3,6-dianhydro-D-mannitol (2), and 1,4 : 3,6-dianhydro-L-iditol (3)] with succinyl dichloride (4a), glutaryl dichloride (4b),…
The fate of a racemic lactic acid polymer (PLA50) was investigated by allowing parallelepiped plates of PLA50 to age in liquid medium containing a mixed culture of Fusarium moniliforme and Pseudomonas putida at 30°C. Microbial activity was monitored by measuring pH, lactic acid formation by high-performance liquid chr…
The reaction of a Ti Me species with carbon monoxide occurred with the complete cleavage of the C O bond and formation of the Ti O unit, while the [Me C] fragment homologated a pyrrole to a 4-methylpyridine ring within the meso -octaethyl tris(pyrrole)−mono(pyridine) macrocycle.
The series of complexes Au(C⋮CR)(PPh 3 ) (R = Ph ( 2 ), 4-C 6 H 4 NO 2 ( 3 ), 4,4‘-C 6 H 4 C 6 H 4 NO 2 ( 4 ), ( E )-4,4‘-C 6 H 4 CH CHC 6 H 4 NO 2 ( 5 ), ( Z )-4,4‘-C 6 H 4 CH CHC 6 H 4 NO 2 ( 6 ), 4,4‘-C 6 H 4 C⋮CC 6 H 4 NO 2 ( 7 ), 4,4‘-C 6 H 4 N CHC 6 H 4 NO 2 ( 8 )) have been synthesized by reaction of AuCl(PPh 3…
Carrier localization in a disordered potential was studied in type-I strained Si1−xGex/Si superlattices (SLs) where layer widths have been artificially pseudorandomized. The photoluminescence (PL) intensity under a transverse bias voltage varies monotonically and exhibits a folded increase as the bias is increased as…
Electron emission from a polycrystalline diamond coated silicon field emitter surface was studied using in situ exposure to various gas species during its operation. Significant enhancement of the electron emission was found after the emitting surface was exposed to hydrogen at pressures in the range 5×10−4 to 10−3 To…
Room temperature photoluminescence spectra from samples of chemically etched porous silicon were analyzed as a function of dopant type, dopant concentration, etchant chemistry, and etching times. In stark contrast to electrochemically etched porous silicon, no significant variations in peak location or width were obse…
A correlation between local crystallographic texture and stress-induced void formation in tantalum-encapsulated, copper interconnects was revealed by electron backscattering diffraction studies in a scanning electron microscope. Lines exhibiting an overall stronger 〈111〉 texture showed better resistance to void format…
We theoretically and experimentally study a new type of angular effect of magnetoresistance in quasi-one-dimensional (Q1D) conductors. It is a kink structure on the angular dependence of interlayer magnetoresistance when the magnetic field is rotated in the most conducting plane. This effect originates from the appear…
A photovoltaic cell with carbonaceous thin film/n-type silicon (C/n-Si) was fabricated utilizing a process in which a carbonaceous thin film was deposited on an n-type silicon substrate by chemical-vapor deposition of 2,5-dimethyl-p-benzoquinone at 500 °C. Under illumination of 15 mW cm−2 light with wavelengths betwee…
The wetting behavior of hybrid isotropic/smectic block copolymers is examined. For symmetric diblocks, the generic parallel ordering of the lamellae is suppressed, and the copolymer wets the surface with the lamellae perpendicular to the surface. The parallel ordering, however, can be restored in asymmetric lamellar d…
The electron paramagnetic resonance (EPR) signal in the mixed valence perovskite ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3+y}$ was investigated in the paramagnetic regime for ${}^{16}$O and ${}^{18}$O isotope substituted compounds. The characteristic differences observed in EPR intensity and…
We show that many two dimensional domain patterns observed in Monte Carlo simulations can be obtained from the many soliton solutions of the imaginary time Sine Gordon equation. This opens the door to analytic physical understanding of the micromagnetics in ultra-thin films.
The kinetics of formation and the structure of an adsorbed layer formed by homopolymer chains irreversibly adsorbed onto a flat wall are studied by Monto Carlo simulation using the bond fluctuation model. The rapid initial adsorption is followed by slow kinetics at later times. The surface coverage can be described by…
We consider the steady-state competition between perfectly absorbing sinks distributed uniformly in a spherical region. An equation for the coarse-grained concentration of diffusing particles inside the region is derived following the renormalization group approach. The total flux of diffusing particles, their coarse-…
Using redundant inverse-power distance coordinates we present a series of optimizations on randomly generated argon clusters containing 12, 24, and 48 argon atoms. Our results clearly show that inverse distance coordinates perform significantly better for optimizing the geometries of atomic clusters than either Cartes…
For atoms or molecules of D∞h or higher symmetry, this work gives equations for the long-range, collision-induced changes in the first (Δβ) and second (Δγ) hyperpolarizabilities, complete to order R−7 in the intermolecular separation R for Δβ, and order R−6 for Δγ. The results include nonlinear dipole-induced-dipole (…
The shear viscosity of water at 303.15 K is calculated for the extended simple point charge (SPC/E) model of Berendsen et al. [J. Phys. Chem. 91, 6269 (1987)] using both equilibrium and nonequilibrium molecular dynamics (NEMD) methods. Reciprocal space sums to handle long-range electrostatic forces in a noncubic simul…
We have devised a reversible set of nonequilibrium molecular dynamics equations of motion to study viscous flow under an applied shear field utilizing a new profile unbiased thermostat (PUT). Based on a modification of the original equations presented by Evans and Morriss [Phys. Rev. Lett. 56, 2172 (1986)], we have ex…
Polymer chains attached by one end to an impenetrable surface at high coverage exemplify a tethered layer of mesoscopic dimensions. At equilibrium, thermal fluctuations of the segment density profile of the brushlike layer reflect the tethered chain dynamics; the probing of these fluctuations by evanescent-wave dynami…