Materials Literature
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In situ copolyesters containing polylactide (PLA) and polyhydroxyalkanoate (PHA) segments were obtained via ring-opening polymerization of L-lactide using PHA as a macroinitiator with stannous octoate as catalyst. Incorporation of PHA (20 wt %) into PLA affords a novel copolymer with Mn values ranging from 25 to 50 KD…
For the seeding process of the Czochralski crystal growth of sapphire, the flow and temperature field with a nonflat melt−gas interface have been studied numerically using the finite element method. The configuration usually used initially in a real Czochralski crystal growth process consists of a crucible, active aft…
Temperature dependences of the static dielectric permittivity and its derivative, obtained for isotropic mesogenic liquids composed of the molecules of different polarity in relation to the basic thermodynamic quantities (internal energy, entropy, and Helmholtz free energy), are analyzed. A role of the molecular polar…
Abstract Novel poly(ester carbonate)s were synthesized by the ring‐opening polymerization of L ‐lactide and functionalized carbonate monomer 9‐phenyl‐2,4,8,10‐tetraoxaspiro[5,5]undecan‐3‐one derived from pentaerythritol with diethyl zinc as an initiator. 1 H NMR analysis revealed that the carbonate content in the copo…
Abstract A photo‐ and proton‐dual‐responsive fluorescence switch based on a bisthienylethene‐naphthalimide dimer was described. Security data storage based on this dual‐responsive fluorescent molecular switch was proposed and demonstrated. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
In order to understand the mechanism of the structural phase transition in CH 3 NH 3 PbBr 3 , neutron diffraction data from the single crystal is analyzed by the least-squares method and the maximum entropy method. The disordered configuration of a methylammonium ion in a cage surrounded by eight PbBr 6 octahedrons is…
The magnetic exchange energies in charge ordered ${\mathrm{La}}_{1/3}{\mathrm{Sr}}_{2/3}{\mathrm{FeO}}_{3\mathrm{\text{\ensuremath{-}}}\ensuremath{\delta}}$ (LSFO) and its parent compound ${\mathrm{LaFeO}}_{3}$ (LFO) have been determined by inelastic neutron scattering. In LSFO, the measured ratio of ferromagnetic exc…
Intermolecular forces between two interacting nanostructures can be obtained by either summing over all the individual atomic interactions or by using a continuum or continuous approach, where the number of atoms situated at discrete locations is averaged over the surface of each molecule. This paper aims to undertake…
Abstract We investigate numerically the electric and the magnetic response of the split‐ring resonators (SRRs) for different electromagnetic (EM) field polarization and propagation directions. We have studied the current density J of circular and rectangular SRRs at THz frequencies. At low frequencies, J is confined t…
A novel hexanuclear Ni-substituted polyoxometalate [Ni 4 (H 2 O) 2 (α-NiW 9 O 34 ) 2 ] 16- ( 1 ) has been synthesized through a hydrothermal method. Polyoxoanion 1 exhibits a usual tetranuclear sandwich-type structure based on unprecedented [α-NiW 9 O 34 ] 12- building units and represents the first polyoxotungstate w…
The 13C NMR chemical shifts for functionalized (7,0), (8,0), (9,0), and (10,0) single-walled carbon nanotubes (SWNTs) have been studied computationally using gauge-including projector-augmented plane-wave (GIPAW) density functional theory (DFT). The functional groups NH, NCH3, NCH2OH, and CH2NHCH2 have been considered…
First-order branched tree structures of MoO 3 belts on sillimanite fibers (refractor wool) were grown by a vapor transport method. At longer growth times, MoO 3 micro-belts on micro-belts form a flower-like structure. Most belts are of α-MoO 3, and they grow in the two opposite directions along the c -axis. They show…
The synthesis and characterization of the Fe(III) complex of a novel crown ether-porphyrin conjugate, 52-N-(4-aza-18-crown-6)methyl-54,104,154,204-tetra-tert-butyl-56-methyl-5,10,15,20-tetraphenylporphyrin (H2Porph), as well as the corresponding hydroxo, dimeric, Fe(II), and peroxo species are reported. The crystal st…
Abstract The structural properties of high porosity nanoporous silicon were researched with the manufacture of integrated nano‐explosive devices in mind. A three‐dimensional nanoporous layer structural model, consisting of cylindrical crystallites, is proposed. Model parameters are derived from gravimetric techniques…
The first chiral zeolite-like galloborate, K2[Ga(B5O10)].4H2O, has been synthesized by a mild solvothermal method and characterized by Fourier transform IR, energy-dispersive spectroscopy, thermogravimetric/differential thermal analysis, and single-crystal X-ray diffraction. This compound crystallizes in the orthorhom…
The solubilities of benzoic acid and phthalic acid in acetic acid + water solvent mixtures are determined by a static method. The experimental temperature ranges from (298.3 to 367.9) K, and the mass fraction of acetic acid in the solvent mixtures ranges from 0.8 to 1.0. The experimental results show that, within the…
The synthesis, physical, and spectroscopic properties of a series of metal complexes bridged by the redox-active chloranilate ligand are described. Compounds containing the (CAcat,cat)4- ligand, where (CAcat,cat)4- represents the fully reduced aromatic form of chloranilate, have been prepared by two different routes f…
Abstract (K 1– x Na x )NbO 3 ( x = 0.01, 0.24, 0.89, 0.91, 0.99) single crystalline powders with perovskite structure were synthesized by a hydrothermal method with Nb 2 O 5 in a mixed solution of KOH and NaOH at 220 °C for 24 h. XRD investigations showed that the structure of the synthesized (K 1– x Na x )NbO 3 ceram…
The production of clean hydrogen is a key requirement for a future hydrogen economy, in general, and, specifically, for the application of proton exchange membrane fuel cells (PEMFC). Here, we focus on one of the essential purification methods, the so-called “PROX” reaction, the preferential oxidation of traces of CO…
In this paper, the pulsed electroacoustic (PEA) technique that allows the determination of space charge in a dielectric material has been used to monitor the electrical potential decay of corona-charged polyethylene films of different thicknesses. To prevent possible disturbance of the surface charge during the PEA me…