Materials Literature
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Series of elongated Schiff base esters containing three aromatic rings with palmitoyl moiety as one of the terminal carbon chain and various substituents R(R=H, F, Cl, Br, OCH3, CH3, and C2H5) at the other end of molecule have been isolated, and their structures were proposed via physical measurement. The mesomorphic…
Supramolecular chiral columnar liquid crystals have been formed through one-dimensional self-assembly of pyrene-containing oligopeptides. Supramolecular chirality is further tuned by cooperation of intermolecular hydrogen bonding and electron donor-acceptor interactions. [reaction: see text]
A miscible polymer/polymer system, poly(vinylidene fluoride) (PVDF)/acrylic rubber (ACM), was subjected to dynamic vulcanization to yield an oil- and heat-resistant thermoplastic elastomer (TPE). The morphology of the TPE has been investigated by small-angle X-ray scattering (SAXS), dynamic mechanical analysis (DMA),…
The compounds Ba 2 LnMoO 6 (Ln = Nd, Sm, Eu, Gd, Dy, Y, Er, and Yb) have been synthesized by solid-state techniques under reducing conditions at temperatures up to 1300 °C. Rietveld analyses of X-ray and neutron powder diffraction data show that these compounds adopt cation-ordered perovskite phases. At room temperatu…
Push-pull indole-containing nonlinear optical chromophores with different acceptor and pi-conjugated moieties have been synthesized and characterized. Experimental measurements of the second-order nonlinear optical response demonstrated that the chromophores exhibit similar or superior optical nonlinearity compared wi…
We use molecular-dynamics simulations to study processes related to resistance to amorphization by radiation damage. We simulate high-energy radiation events in ${\mathrm{SiO}}_{2}$, ${\mathrm{GeO}}_{2}$, ${\mathrm{TiO}}_{2}$, ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}$, and $\mathrm{MgO}$, and find that simulation results ma…
Abstract PbO–Nb 2 O 5 –P 2 O 5 glasses containing different concentrations of V 2 O 5 ranging from 0 to 1.0 mol% were prepared. A number of studies, viz. differential thermal analysis, infrared, optical absorption, Raman and ESR spectra and dielectric properties (dielectric constant ϵ ′, loss tan δ , a.c. conductivity…
The green emission band of ZnO has been investigated by both experimental and theoretical means. Two sets of equally separated fine structures with the same periodicity (close to the longitudinal optical (LO) phonon energy of ZnO) are well resolved in the low-temperature broad green emission spectra. As the temperatur…
Porcine and recombinant human atelocollagen I solutions were cross-linked with a water soluble carbodiimide at various stoichiometries and collagen concentrations (5-20 w/w %). The resulting hydrogels were clear and, when used as cell growth matrices, allowed cell and nerve visualization in vitro and in vivo. We have…
A biodegradable polyester elastomer, poly(1,8-octanediol citrate) (POC), is used to modify the lumen of expanded polytetrafluoroethylene (ePTFE) grafts via a spin-shearing method followed by interfacial in situ polycondensation. We demonstrate successful surface modification of ePTFE grafts without affecting graft com…
Sulfur-doped zinc oxide (ZnO) nanowires grown on gold-coated silicon substrates inside a horizontal tube furnace exhibit remarkably strong visible wavelength emission with a quantum efficiency of 30%, an integrated intensity 1600 times stronger than band edge ultraviolet emission, and a spectral distribution that clos…
A cyclic adsorption process simulator was used to study novel high-temperature pressure swing adsorption (PSA) cycles. Based on the use of a K-promoted hydrotalcite-like (HTlc) adsorbent and six different (vacuum swing) stripping PSA cycles, these cycles were designed to process a typical stack gas effluent at 575 K c…
The status of rapid solidification of highly undercooled bulk liquid superalloys is critically evaluated and future directions of research in this technologically important area are proposed. First, consideration is given to purification mechanisms and preparation of a novel SiO2–ZrO2–B2O3 (i.e. Si–Zr–B) compound moul…
Grazing-incidence small-angle X-ray or neutron scattering of thin polymer films reveals information about the ordering and preferential orientations of the phase-separated microdomains within the films. The grazing-incidence geometry enhances the surface sensitivity; however, the scattering has to be treated within th…
We present a simple reaction kinetics model to describe the polymer synthesis used by Lusignan et al. (PRE, 60, 5657, 1999) to produce randomly branched polymers in the vulcanization class. Numerical solution of the rate equations gives probabilities for different connections in the final product, which we use to gene…
A beam splitter is an important component of an atomic/optical Mach-Zehnder interferometer. Here we study a Bose Einstein Condensate beam splitter, realized with a double well potential of tunable height. We analyze how the sensitivity of a Mach Zehnder interferometer is degraded by the non-linear particle-particle in…
The synthesis and characterization of ultrafine CuInS2 nanoparticles are described. Ultraviolet irradiation was used to decompose a molecular single source precursor, yielding organic soluble approximately 2 nm sized nanoparticles with a narrow size distribution. UV-vis absorption, 1H and 31P{1H} NMR, and fluorescence…
We study the integer and fractional quantum Hall effect on a honeycomb lattice at half-filling (graphene) in the presence of disorder and electron-electron interactions. We show that the interactions between the delocalized chiral edge states (generated by the magnetic field) and Anderson-localized surface states (cre…
In recent years there has been a growing interest in the statistical properties of surfaces growing under deposition of material. Yet it is clear that a theory describing the evolution of a surface should at the same time describe the properties of the bulk buried underneath. Clearly, the structure of the bulk is rele…
Analytical equations of state are presented for fluid mercury in metal, nonmetal, and in metal-nonmetal transition states. Equations of state for metal and nonmetal states are simple in form but the complexities of transition state leads to a complex fourth-order equation. The interatomic potential function used to de…