Materials Literature
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The characteristics of Phenanthrenquinone (PQ) doped Polymethyl methacrylate (PMMA) for recording edge-illuminated holographic spectral filters for dense wavelength division multiplexing applications are evaluated. Filter design includes the effects of material absorption and apodization of the index profile. Rigorous…
Two new C-21 steroidal glycoside epimers, paniculatumosides A and B (1 and 2), based on a 13,14:14,15-disecopregnane-type skeleton, with neocynapanogenin B (3) and neocynapanogenin C (4) as two new aglycons, were isolated from the roots of Cynanchum paniculatum. Their structures were determined by spectral data interp…
Abstract Cellulose hollow fiber membranes (CHFM) were prepared using a spinning solution containing N‐methylmorpholine‐N‐oxide as solvent and water as a nonsolvent additive. Water was also used as both the internal and external coagulant. It was demonstrated that the phase separation mechanism of this system was delay…
The effects of Mn doping on the ferroelectric properties of Pb(Zr 0.3 Ti 0.7 )O 3 (PZT) thin films on Pt/Ti/SiO 2 /Si substrates have been investigated. The composition of the PZT and Mn doping level are Pb(Zr 0.3 Ti 0.7 ) 1− x Mn x O 3 ( x = 0,0.2,0.5,1,2,4 mol%). The PZT thin films doped with a small amount of Mn 2+…
The reaction of equimolar NO with the 16 electron molecule RuHCl(CO)L(2) (L = P(i)Pr(3)) proceeds, via a radical adduct RuHCl(CO)(NO) L(2), onward to form RuCl(NO)(CO)L(2) (X-ray structure determination) and RuHCl(HNO)(CO)L(2), in a 1:1 mole ratio. The HNO ligand, bound by N and trans to hydride, is rapidly degraded b…
Energy migration between tryptophan residues has been experimentally demonstrated in self-assembled peptide tapes. Each peptide contains 11 amino acids with a Trp at position 6. The peptide self-assembly is pH-sensitive and forms amphiphilic tapes, which further stack in ribbons (double tapes) and fibrils in water dep…
Abstract Polycaproamide (PCA) and cationic dyeable poly(ethylene terephthalate) (CDP) polymers were blended mechanically (in ratios of 75/25, 50/50, and 25/75) in a melt twin‐screw extruder to prepare three PCA/CDP polyblended materials. The blends of PCA and CDP were spun into fibers. The molar ratio of dimethyl 5‐su…
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…