Materials Literature
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Resin Transfer Molding (RTM) can be described as a two step process: fiber preforming followed by resin infusion and cure. In the first stage, the fabric form making up the preform element is placed in the tool and is compacted due to the pressure from tool closure. During this process, the microstructure, and the res…
The influence of manufacturing variables and different drying conditions on the amount of residual solvents and on other quality characteristics of biodegradable PLA- and PLGA-microspheres was investigated. Empty and BSA-loaded microspheres were prepared by an organic phase separation method using either dichlorometha…
Abstract
Phase behavior and ordering characteristics were reported for poly(γ-benzyl l -glutamate) (PBLG) in a mixed solvent containing a denaturant acid, dichloroacetic acid (DCA), + dichloroethane (DCE). The solutions of PBLG prepared so as to be liquid crystal at room temperature were observed to undergo a reentrant isotrop…
Molecular dynamics computer simulations have been performed on an isolated polyisoprene chain at 298 K. Simulations of polyisoprene in the melt (413 K) and in solution (298 K) have been previously reported. The local dynamics of polyisoprene chains in these three environments are compared. While conformational transit…
Continuous wave electron nuclear double resonance (CW ENDOR) spectra of [delta-15N,epsilon(-14)N]histidine-labeled phthalate dioxygenase (PDO) from Pseudomonas cepacia were recorded and found to be virtually identical to those previously recorded from [delta,epsilon-15N2]histidine-labeled protein [Gurbiel, R. J., Bati…
The iron chlorides FeCl, FeCl 2, and FeCl 3 and their ions FeCl +, FeCl 2 +, FeCl -, FeCl 2 -, and FeCl 3 - were investigated using MP2 and QCISD(T) calculations with double- and triple-ζ basis sets augmented with multiple sets of diffuse and polarization functions. The dissociation enthalpies for FeCl → Fe + Cl, FeCl…
Two tert-butyldiphenylsilyl-protected synthons 7 and 9 are prepared in excellent yields and used in a one-pot synthesis of higher generation polyether dendrons.
The redox chemistry and the changes that occurred within the solids were studied for an excessively exchanged and a nearly stoichiometric CoZSM-5 zeolite as a function of pretreatment, reduction, and reoxidation conditions. Both gravimetric and volumetric techniques were used to determine this chemistry and the stoich…
The crystallinity ( x c ) of high-pressure-crystallized poly(ethylene terephthalate) (PET), which shows values of x c ≅ 0.90 when measured by differential scanning calorimetry (DSC), was examined by means of wide-angle X-ray scattering (WAXS). PET samples crystallized under normal conditions were also investigated by…
Infrared spectroscopy measurements of the kinetics and decomposition pathways of aqueous urea ((NH 2 ) 2 CO, 200−300 °C, 275 bar) and guanidinium nitrate ([(NH 2 ) 3 C]NO 3, 240−300 °C, 275 bar) are described. A Pt/Ir alloy flow cell with diamond wafer windows was used, and heat and fluid transport models show that is…
An understanding of the molecular mechanism of muscle contraction will require a complete description of the kinetics of the myosin motor in vitro and in vivo. To this end chemical relaxation studies employing light-directed generation of ATP from caged ATP have provided detailed kinetic information in muscle fibers.…
A series of bithiophenes, disubstituted with electron donor and electron acceptor groups, have been synthesized. The electronic effects exerted by these groups, on the electrochemical oxidation potential of bithiophenes, are additive, which allows us to control the overall substituent effect and make it compatible wit…
We utilized large angle light scattering to study the structure of a sheared semidilute polymer solution. Below a critical shear rate γ̇ c we observe an enhancement of concentration fluctuations in accordance with previous experimental and theoretical work. Above γ̇ c we find dramatic changes in the transient and stea…
The visible absorption band of iodine adsorbed on zeolite blue-shifted with increasing the electropositivity of the countercation and the aluminum content in the framework. This phenomenon was attributed to the increase in the donor strength of the zeolite framework based on the analogous spectral shift of iodine in s…
The doping of silver and palladium into a 0.9Pb‐(Mg 1/3 Nb 2/3 )O 3 –0.1PbTiO 3 (PMN–PT) ceramic has been investigated. It was found that Ag could be incorporated into the PMN–PT lattice, though this was almost impossible with Pd. Doping at up to 0.2 mol% of Ag and Pd reduced the maximum dielectric constant ( K max )…
We report the synthesis and characterization of monodispersed lead sulfide (PbS) particles with diameters in the range 4−14 nm, using bicontinuous cubic phase as a matrix. It was found, through polarized optical microscopy and small-angle X-ray scattering studies, that the viscous isotropic bicontinuous cubic phase co…
The heterobimetallic cationic NLO chromophore (1-ferrocenyl-η 6 -borabenzene)(η 5 -cyclopentadienyl)cobalt(1+) ([{1-((η 5 -C 5 H 5 )Fe(η 5 -C 5 H 4 ))-η 6 -BC 5 H 5 }Co(η 5 -C 5 H 5 )] +, 1 + ) has been synthesized by reaction of FcBBr 2 and cobaltocene and subsequent oxidation with FeCl 3 . The neutral bimetallic com…
Rheological and dielectric behavior was examined for a 50 wt % solution of a symmetric styrene−isoprene−styrene (SIS) triblock copolymer ( M = 60.2K, S content = 28%) dissolved in an I-selective solvent, n -tetradecane (C14). Dynamic mechanical tests with various strain amplitudes, γ 0 = 0.03−0.8, were performed at va…
Amorphous C:D (or C:H) films were deposited on the inner surface of a spherical ultrahigh vacuum chamber by means of a direct current glow discharge in a ∼75% D2 (or H2) and ∼25% CD4 (CH4) gas mixture. Laser Raman spectroscopy analysis of the film exhibited the absence of a diamond peak at 1334.3 cm−1. The general app…