Materials Literature
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Recombinant Escherichia coli strains harboring heterologous polyhydroxyalkanoate (PHA) biosynthesis genes were shown to accumulate unusually large amounts of PHA. In the present study, integrated cellular responses of metabolically engineered E. coli to the accumulation of poly(3-hydroxybutyrate) (PHB) in the early st…
This study investigated the basic biocompatibility aspects of two types of polypyrrole (PPy)-coated polyester fabrics for possible use as vascular prostheses. These PPy-coated fabrics, PPy-Phos and PPy-Plas, were sterilized with ethylene oxide (EO) and the following characterizations were performed: surface morphology…
A novel one-dimensional copper(II) compound [Cu(L)(μ1,3-N3)(ClO4)]n [L = tridentate Schiff base, formed by condensation of pyridine-2-aldehyde and 1-(2-aminoethyl)piperidine] has been synthesized and structurally characterized; it exhibits ferromagnetic interaction via end-to-end azido (μ1,3-N3) linkages, as rationali…
In this paper we report an experimental study on the conditions for droplet breakup in concentrated emulsions under simple shear flow. We present a set of experiments where the ratio between drop and matrix viscosity was varied from 0.1 to 22 and the volume fraction ranged from 0% to 70%. It was observed that the crit…
The cationic copolymerization of regular soybean oil, low-saturation soybean oil (LoSatSoy oil), or conjugated LoSatSoy oil with styrene and divinylbenzene initiated by boron trifluoride diethyl etherate (BF3·OEt2) or related modified initiators provides viable polymers ranging from soft rubbers to hard, tough, or bri…
Preface 1. Overview and applications of diffractive optics technology J. Allen Cox 2. Variational methods for diffractive optics modeling Gang Bao and David C. Dobson 3. High-order boundary perturbation methods Oscar P. Bruno and Fernando Reitich 4. Mathematical reflections on the Fourier modal method in grating theor…
The influence of long-term corona on the degradation of non-ceramic composite insulator (NCI) housing materials was studied. Polymer samples were obtained from full-scale NCI, employing three different housing materials, namely silicone rubber, ethylene propylene diene monomer rubber and a blend of EPDM with silicone…
A series of bis[octakis(alkylthio)phthalocyaninato]rare-earth-metal(III) discotic compounds, [(CnS)8Pc]2M (M = Eu(III), Tb(III), Lu(III); n = 8, 10, 12, 14, 16, 18), has been synthesized. The mesomorphic and supramolecular structures have been investigated by using differential scanning calorimetry, polarization micro…
The interaction between poly(ethylene glycol) (PEG) and water was studied by differential scanning calorimetry (DSC). The DSC curves of PEG–water systems were classified into three groups according to the difference in molecular weight. The melting peaks of eutectic mixture appeared for PEG with molecular weight highe…
Oxygen reduction reaction (ORR) kinetics were investigated on hulk synthesized analogues of Al-Cu, Al-Cu-Mg, and Al-Cu-Fe-Mn intermetallic phases with and without chromate conversion coating (CCC) in 0.1 M Na 2 SO 4 + 0.005 M NaCl (pH 6) with minimal levels of total dissolved chromate. The results were compared to AA…
Manganese oxide thin films were deposited onto transparent and conductive tin oxide-coated glass substrates by electrochemical deposition (at 1.2 V vs. Ag/AgCl) and subsequent chemical [electrolysis/chemical (EL/C)] processing in a manganese ammine complex solution at pH 8. Characterization by X-ray diffraction (XRD)…
The objective of this work was to elucidate the mechanism by which polyaniline (PANI) films passivate stainless steel surfaces in highly corrosive solution. A variety of experimental methods, including measurements of the open-circuit potential, Auger depth profiling, and the scanning reference electrode technique (SR…
The electrochemical behavior of the intermetallic phase was studied using thin film compositional analogs prepared by flash evaporation. Characterization by scanning electron microscopy, atomic force microscopy, and Auger electron spectroscopy depth profiles indicated that the films were single phase, laterally homoge…
We present a second gradient elastoplastic model for strain-softening materials based entirely on a finite element displacement formulation. The stress increment is related to both the strain increment and its Laplacian. The displacement field is the only field needed to be discretized using a C1 continuity element. T…
A scanning Kelvin probe technique is used to study the influence of chromate on the kinetics and mechanism of corrosion-driven delamination processes affecting polyvinyl butyral (PVB) coatings adherent to the intact zinc surface of hot dip galvanized steel. Placing aqueous sodium chloride electrolyte onto a penetrativ…
Solid polymerization of 2,5,8-tricarbodiimide-tris-s-triazine potassium salt (potassium melonate) and 2,5,8-trichloro-tris-s-triazine (cyameluryl trichloride) gave a symmetric triangular form of a prototype carbon nitride which is deammonation-polycondensed with fifteen 2,5,8-triamino-tris-s-triazine molecules.
Polycarbonate-based polyurethanes with varying hard segment contents were synthesized. The physical and chemical structures were characterized by using gel permeation chromatography, differential scanning calorimetry, water uptake testing, Fourier transform infrared, and attenuated total reflectance--Fourier transform…
In vitro degradation and erosion of novel, degradable segmented polyurethanes containing a phenylalanine diester chain extender were investigated by exposing the polymers to buffer. chymotrypsin, and trypsin solutions for up to 28 days. Polyurethane degradation and erosion were monitored by gravimetry, scanning electr…
Calcined pure silica MCM-48 is modified by silylating its mesopores with trimethylsilyl chloride; such pore modification along with polymerization and carbonization of divinylbenzene as a carbon precursor is found to be a very efficient way of fabricating highly ordered carbon molecular sieves with three-dimensionally…
Based on our previous Monte Carlo simulation model of electron interactions with solids, including cascade secondary electron production, in which an optical dielectric function was used to describe electron energy loss and the associated secondary electron excitation, we have systematically investigated secondary ele…