Materials Literature
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We study the structure and thermodynamics of the critical nuclei in metastable binary polymer blends using the self-consistent field method. At the mean-field level, our results are valid throughout the entire metastable region and provide a smooth crossover from the classical capillary-theory predictions near the coe…
Despite the importance of the chloride ion in magmas and the fluids that separate from them, very little is known about atomic-scale structural environments for Cl- in silicate glasses. We present here the first solid-state 35 Cl NMR data for Cl in silicate and aluminosilicate glasses, made possible by the availabilit…
A simple pictorial method using HOMO, LUMO, and LUMO+1 of azulene coupled with interaction between the electrons in the singly occupied orbitals is introduced to show how the S 2 -S 0 energy gap relative to the S 1 -S 0 gap can be changed by a choice of substituents. The result is changing the characteristic blue colo…
Molecular dynamics simulations are performed on generations 2 ( G 2) through 5 ( G 5) of poly(propylene imine) dendrimers at 400 K in order to investigate characteristics of molecular structure and morphology in the melt. As the generation increases, the dendrimers assume a more spherical shape, and the degree of dend…
Abstract Many crystalline materials show chemical short range order and relaxation of neighboring atoms. Local structural information can be obtained by analyzing the atomic pair distribution function (PDF) obtained from powder diffraction data. In this paper, we present the successful extraction of chemical short ran…
Abstract The plasticity of semicrystalline polymers is analyzed in the framework of Young's dislocation model under the assumption of nucleation of screw dislocations from the lateral surface of the crystalline lamellae. It is proposed that the driving force for the nucleation and propagation across the crystal width…
We present a stable and efficient method for the Bloch-mode computation of one-dimensional grating waveguides. The approach uses the Fourier modal method and the S-matrix algorithm to remove numerical instabilities. The use of perfectly matched layers provide a high accuracy. Numerical results obtained for different l…
Compact and simple nondiscoid mesogens, trialkoxybenzoic anhydrides 2-11 ((RO)(3)C(6)H(2)-CO-O-CO-C(6)H(2)(OR)(3), R = C(2)H(5), n-C(3)H(7), n-C(4)H(9), n-C(6)H(13), n-C(8)H(17), n-C(10)H(21), n-C(12)H(25), n-C(14)H(29), n-C(16)H(33), and (S)- and (R)-3,7-dimethyloctyl) were designed and synthesized, and their superst…
PURPOSE: This is the first study to evaluate the tolerability and activity of liposomal doxorubicin (Caelyx; Schering-Plough Pharmaceuticals) < or =60 mg/km(2) in patients with locally recurrent breast cancer, when administered in conjunction with reirradiation and local hyperthermia treatment. EXPERIMENTAL DESIGN: Fi…
Abstract The crystal structures of yellow Cu 3 PS 4 and of black Cu 3 SbS 4 were refined from single crystal X-ray diffraction data. Cu 3 PS 4 crystallizes orthorhombic in an ordered wurtzite superstructure type with the space group Pmn 2 1 (no. 31), a = 7.282(1) Å, b = 6.339(1) Å, c = 6.075(1) Å, V = 280.38(8) Å 3 ,…
We describe the variational limit of one-dimensional nearest-neighbour systems of interactions, under no structure hypotheses on the discrete energy densities. We show that the continuum limit is characterized by a bulk and a interfacial energy density, which can be explicitly computed from the discrete energies throu…
A hybrid inorganic-polymer composite was formed through nanosize silica filler particles (< 30 nm) that were incorporated inside a nylon-6 matrix. The composite was microtomed and examined with TEM which revealed that the silica particles were well dispersed and non-aggregated. Optimization of the synthesis conditions…
Semiconducting properties of two types of cubic boron nitride (cBN) single crystals prepared at high pressure and high temperature were evaluated by Hall measurement. Sulfur was intentionally doped in one type as a donor and the other type contained no intentional dopants. Both crystals exhibit n-type conduction. Sulf…
Sandia octahedral molecular sieves (SOMS) is an isostructural, variable composition class of ion exchangers with the general formula Na(2)Nb(2-x)M(IV)(x)O (6-x)(OH)(x).H(2)O (M(IV) = Ti, Zr; x = 0.04-0.40) where up to 20% of the framework Nb(V) can be substituted with Ti(IV) or Zr(IV). This class of molecular sieves i…
The size effect on thermal conductivity of a free-standing wire with rectangular cross-section is investigated. The electronic thermal conductivity is calculated within a Boltzmann transport equation approach. A simple expression for the reduction in conductivity due to the increase of boundary scattering is presented…
This research is a comparative study of the structural and physical properties of ring, rotor, and friction spun yams and an attempt to explain the differences in their physical properties on the basis of yam structure. Results show that the ring spun yam exhibits the highest fiber migration, followed by rotor spun ya…
Forty-nanometer-thin free-standing membranes with 55-nm-wide pores have been prepared via Langmuir−Blodgett transfer. Hydrophobized silica colloids and polyisoprenes with quaternary ammonium headgroups were jointly spread onto a water surface to form a hybrid monolayer in which two-dimensional ordered domains of parti…
Abstract Micromorphological studies were performed in order to understand the factors and processes involved in the formation of calcium carbonate (CaCO 3 ) in twenty three soil series of Vertisols representing sub-humid, semi-arid and arid climatic regions of Peninsular India. The study indicates that Vertisols conta…
Ni , Zn , Pd and Pt tetra(pentafluorophenyl)porpholactone (TFPL) were synthesized and identified by their optical and mass spectra. The lactone ring was produced from the parent free-base porphyrin using silver nitrate and oxalic acid with a yield of 73%, and the metals were inserted by standard procedures from metal…
Excitonic effects are observed in the optical absorption and photoluminescence of strongly confined CdS quantum dots embedded in the polymer Nafion. The three bands identified in the optical absorption spectra could be attributed to 1se-1sh, 1pe-1ph, and 2se-2sh transitions of the noninteracting particle model. Photol…