Materials Literature
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Abstract A typical resorcinol/formaldehyde/latex (RFL) adhesive and two modified versions were used to bond a tire body stock (NR/SBR/BR blend) to polyethylene terephthalate (PET) cord. Modifications contained a commercial chlorophenol/resorcinol condensate or a lab‐prepared chlororesorcinol/resorcinol condensate (CRA…
Abstract Infrared (IR) spectroscopy studies were performed for poly(methyl methacrylate) (PMMA) samples doped with an organic ligand or its cobalt(II) complex after the extraction of the dopant during γ‐radiolysis. There were no drastic changes in the IR absorption band position, but noticeable changes in the intensit…
Copolymers composed of 5-acryloyloxypentyl cholesterate (Ch5A) and acrylic acid (AA), poly(Ch5A- co -AA)s, were prepared changing their molar ratio, and their mesomorphic behaviors were investigated. Wide- and small-angle X-ray diffraction studies showed that poly(Ch5A- co -AA)s with a Ch5A mole fraction, F, of 0.20 a…
The photoluminescence of YAl 3 (BO 3 ) 4 :Eu 3+ phosphor is sensitized by the codoping of Gd 3+ ions under ultraviolet excitation from 130 nm to 160 nm. The Gd 3+ ions sensitize the emission of Eu 3+ ions by a two-step energy transfer from the host to Gd 3+ and then to Eu 3+ ions.
We study the phonon dynamics of ${\mathrm{MgTi}}_{2}{\mathrm{O}}_{4}$ spinel by measuring the Raman and infrared reflectivity spectra in a wide frequency $(100--3000{\mathrm{cm}}^{\ensuremath{-}1})$ and temperature (10 K--300 K) range. The reflectivity spectra are analyzed by a fitting procedure based on a model which…
In this note, we re-examine one-dimensional diffusion experiments of high concentration aqueous CuSO 4 into deionized water carried out by Carey A E et al (1995 Water Resources Res. 31 2213–18). We show that spreading of concentrated CuSO 4 fronts does not conform to the t 1/2 relation expected from Fick's hypothesis…
We present a model for structure formation, melting, and optical properties of gold/DNA nanocomposites. These composites consist of a collection of gold nanoparticles (of radius 50 nm or less) which are bound together by links made up of DNA strands. In our structural model, the nanocomposite forms from a series of Mo…
The structure of Gd-DTPA-polylysine, Gd-DOTA-polylysine, Gd-SCN-Bz-DOTA-polylysine, and Gd-DTPA-poly(glu:lys) was investigated with circular dichroism, gel permeation chromatography, low angle light scattering, and proton longitudinal relaxivity. Molecular modeling calculations were performed and predicted helical sec…
A three-dimensional network model for performing non-linear time-dependent simulations of the electrical characteristics related to a composite material is presented. The considered compounds are represented by a cubic lattice and consist of conducting particles distributed in an insulating matrix. Earlier studies of…
Arrays of multi-walled carbon nanotubes (MWCNTs) were fabricated by pyrolysis of iron phthalocyanine (FePc). A silicon wafer and a stainless steel plate were used as the substrates. MWCNTs grown on the silicon wafer were packed closely to each other and were thus well aligned, while those grown on the stainless steel…
Highly dense piezoelectric ceramics of tungsten bronze-type (Sr 1.9 Ca 0.1 ) 1-0.5 x Ba x NaNb 5 O 15 (where x =0.1–0.8) were prepared by spark plasma sintering. The crystallographic parameters, dielectric behaviors and piezoelectric properties of the sintered ceramics were investigated, and the effects of the Ba subs…
Abstract The crystallization and melting behavior of bisphenol A polycarbonate treated with supercritical carbon dioxide (CO 2 ) has been investigated with differential scanning calorimetry. Supercritical CO 2 depresses the crystallization temperature ( T c ) of polycarbonate (PC). The lower melting point of PC crysta…
Abstract Ramie yarns were treated with various concentrations of NaOH at room temperature and subsequently crosslinked with 1,2,3,4‐butanetetracarboxylic acid (BTCA). The microstructure and tensile properties of the treated yarns were characterized. X‐ray diffraction (XRD) and FTIR were used to study the crystalline s…
Epitaxial ZnO films have been grown on Si(111) substrates by molecular beam epitaxy using oxygen plasma. An initial Zn layer deposition followed by its oxidation produces a superior template for the subsequent ZnO growth and a low-temperature ZnO buffer layer improves the structural and optical properties of ZnO films…
The use of nanosphere lithography to construct two-dimensional arrays of polystyrene (PS) particles coated with multilayered polyelectrolyte (PE) shells and truncated eggshell structures composed of PE thin layers is reported. The truncated eggshell PE structures were produced by extraction of the PS particle cores wi…
We measured and analyzed the electrical resistivity (ρ), Hall coefficient ( R H ), Seebeck coefficient ( S ) and magnetic susceptibility (χ) of γ-phase Na 0.6 CoO 2 and α-phase Na 0.9 CoO 2 crystals prepared by solution growth using NaCl-Na 2 CO 3 -B 2 O 3 fluxes. The ρ of α-phase Na 0.9 CoO 2 (ρ α ) is much higher th…
The CO 2 −CH 4 reaction on Rh/Al 2 O 3 was studied by in situ infrared spectroscopy coupled with pulse and step transient techniques. Steady-state isotopic 13 CO transient studies at 773 K and 0.1 MPa show that the formation of gaseous 13 CO 2 closely follows that of linear 13 CO, indicating that linear CO is an activ…
In a supermolecular system, the sum of properties is more than that of the individual components. The combination of rod and disc shaped groups (see picture) in the right ratio allows the design of a material with nematic and several layered (smectic) phases. Shape-induced nanophase segregation of rods and discs leads…
The behavior of fluorinated surfactant F(CF2)8C2H4(OC2H4)9OH in water solution was investigated, and the preparation ofmesoporous molecular sieves was achieved. A direct micellar phase (L1) and a hexagonal (H1) liquid crystal were found. Small-angle X-ray scattering measurements proved that the hydrophobic chains are…
We describe two strategies for tackling the equilibrium statistical mechanics of inhomogeneous colloid—polymer mixtures treated in terms of the simple Asakura—Oosawa—Vrij (AO) model, in which colloid—colloid and colloid—polymer interactions are hard-sphere like, whereas the polymer—polymer interaction is zero (perfect…