Materials Literature
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Four 3-D coordination polymers of lanthanide with a tetra(amino acid) ligand, 1,4,8,11-tetraazacyclotetradecane-1,4,8,11-tetrapropionic acid (H4L, 1), were synthesized. The structure of the Gd(III) complex was characterized. The fluorescence of the Eu(III) complex can be modulated by Ag+.
The implications of the entanglement concentration ( C e ) on the electrospinning process for a series of linear and branched poly(ethylene terephthalate- co -ethylene isophthalate) (PET- co -PEI) copolymers with weight-average molecular weights ( M w ) ranging from 11 700 to 106 000 g/mol and branching index values (…
Abstract A series of linear polyamides (P n MLM) derived from O ‐methyl‐protected L ‐malic acid and 1, n ‐alkanediamines with even n values ranging from 4 to 12 were prepared and fully characterized. L ‐Malic acid entered in the chain with a random orientation rendering essentially aregic polymers. P n MLM displayed o…
The practicality of using polysulfone as a host material for electro-optic polymer devices is demonstrated. For loadings of 15–25 weight %, r33 values of 53–55 pm/V were obtained at λ=1.06 μm. This corresponds to chromophore alignment efficiencies of up to 27%. Also, Mach–Zehnder devices demonstrated the implementatio…
Second-harmonic generation and thermal stability of hybrid photosensitive sol-gel films doped with a side-chain electro-optic chromophore have been studied. Nonlinear optic coefficient d33 has been derived for the cross-linked and noncross-linked sol-gel films. The d33 of the cross-linked hybrid sol-gel film shows hig…
The compositionally graded Ba1−xSrxTiO3 films with a fine compositional gradient from BaTiO3 to Ba0.70Sr0.30TiO3 were fabricated on LaNiO3-buffered Pt–Ti–SiO2–Si substrates by a sol-gel deposition method. After post-deposition annealing the graded films crystallized into a pure perovskite structure with their crystall…
Abstract An Erratum has been published for this article in Journal of Polymer Science Part A: Polymer Chemistry (2004) 42(10) 2575‐2576 Starlike, highly branched (A x B y A z ) macromolecules having from a few to 100 arms and molar masses up to 10 5 were prepared in three stages with the one‐pot, arms‐core‐arms method…
We show that the conventional consideration of the electron-field emission from nanocarbons cannot explain the experimentally observed results. We suggest a mechanism of the field emission occurrence from nanocarbons that can solve the existing puzzles. This mechanism implies two successive processes: (1) Tunneling th…
Adsorption of 4-biphenylmethanethiolate (BPMT) has been studied for different-sized gold nanoparticles, with mean diameters of 6, 11, 15, 27, 35, 43, and 97 nm, using surface-enhanced Raman scattering (SERS). Transmission electron microscopy (TEM) images and UV−visible absorption spectra were obtained to examine the m…
The sulfonation of polyaniline (PANI) films by nucleophilic addition of sulfite ion has been controlled through the polymer oxidation state under electrochemical control. The process was monitored by in situ electrochemical quartz crystal microbalance (EQCM), and the polymer oxidation was accomplished by electrode pot…
Abstract Relying on a model allowing to predict mechanical properties and acoustic absorption of a regular f.c.c stacking of hollow spheres, and on a functional analysis of acoustic liners for airplane engines, a methodology for optimal design of a taylored multifunctional material is proposed.
The reactivity of the sterically hindered organofluorosilane 2,6-Mes 2 C 6 H 3 -SiF 3 ( 1 ) (Mes = 2,4,6-trimethylphenyl) under hydrolytic conditions differs substantially from that of the corresponding organo chlorosilane. During the hydrolysis of 1 the combination of thermodynamic (increased Si−F bond strengths comp…
Optical and dielectric anisotropy of the polyimide nanocomposite films prepared from soluble poly(amic‐diethyl ester) precursors has been studied using a prism coupling technique. The composite films showed nonlinear dependence of in‐plane and out‐of‐plane refractive indices (dielectric constants) on the composition.…
Well-aligned and highly porous carbon nanofiber (CNF) arrays were obtained by a template synthesis method, using epoxy-based solution as carbon precursor in the present study. The diameter and length of the nanofiber were accord with pore size of 100 nm and thickness of 50 μm of the anodic aluminum oxide membrane, res…
Abstract In this study, the heat‐shrinkage property in polymer was induced by first compounding low‐density polyethylene/poly(ethylene vinyl acetate) (LDPE/EVA) blends with various amounts of peroxide in a twin‐screw extruder at about 130°C. The resulting granules were molded to shape and chemically crosslinked by com…
We show from ab initio density-functional calculations and model studies that, in the electron-doped manganite ${\mathrm{L}\mathrm{a}}_{x}{\mathrm{C}\mathrm{a}}_{1\ensuremath{-}x}{\mathrm{M}\mathrm{n}\mathrm{O}}_{3}$ ($x\ensuremath{\ll}1$), unbound electrons are introduced into the conduction band, which then trap the…
Abstract The pharmaceutical industry is moving towards a profitability gap between increasing costs and decreasing prices. Finally, management has understood that mergers and acquisitions, high throughput screening, and biotechnology alone will not save the companies' earnings. Therefore, classical approaches like the…
Thin films of Ba(Zr0.15Ti0.85)O3 were crystallized in situ at several different oxygen background pressures and temperatures. The optimal temperature and pressure for obtaining films with smooth surface morphology and good electrical properties was found to be 675 °C and 300 mTorr, respectively. Films grown at this te…
We present an experimental study of the magnetic microstructure in the nanocrystalline hard magnet Tb. Field-dependent small-angle neutron scattering (SANS) data are analyzed quantitatively in terms of the correlation function of the spin misalignment. We find that up to applied fields of several tesla the magnetizati…
Polarized optical reflectance and photoreflectance spectra of an out-plane nonpolar (112̄0) ZnO epilayer grown by laser molecular-beam epitaxy exhibited anisotropic exciton resonance structures according to the polarization selection rules for anisotropically strained hexagonal material. Consistently, the electric fie…