Materials Literature
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Novel pH-sensitive polymers were synthesized by copolymerizing a monomer derivatized from 4-amino-N-[4,6-dimethyl-2-pyrimidinyl]benzene sulfonamide with N,N-dimethylacrylamide. The linear copolymers showed pH-sensitive solubility, while chemically crosslinked hydrogels exhibit a relatively sharp transition in swelling…
The use of hyperbranched polymers (HBPs) as a processing aid for linear low density polyethylene (LLDPE) was investigated. Various generation (or pseudo-generation) HBPs were used which had either 16 carbon atom alkanes or a mixture of 20/22 carbon atom alkanes on the end groups. In addition, the degree of end group s…
Various graphitic phases of ${\mathrm{C}}_{3}{\mathrm{N}}_{4}$ are examined using the local-density approximation plane-wave-pseudopotential approach. These are three forms of p graphite and the $P6\ifmmode\bar\else\textasciimacron\fi{}m2$ graphite structure. Each differs only in planar stacking and character of plana…
The wafer flexure technique was used to characterize the d31 coefficient of a number of sol–gel and radio frequency (rf) sputtered lead zirconate titanate (PZT) thin films with thicknesses between 0.6 and 3 μm. Typical d31 values for well-poled 52/48 sol–gel films were found to be between −50 and −60 pC/N. The rf sput…
The structural and thermodynamic properties of a two-dimensional binary mixture of soft discs are reported over a range of temperatures down to large supercoolings using constant NPT molecular dynamics simulations. It is shown that the four orders of magnitude increase in the structural relaxation time is not accompan…
When expressed by pathogenic bacteria, Zn2+-beta-lactamases induce resistance to most beta-lactam antibiotics. A possible strategy to fight these bacteria would be a combined therapy with non-toxic inhibitors of Zn2+-beta-lactamases together with standard antibiotics. For this purpose, it is important to verify that t…
In this work, X‐ray diffractometry and scanning electron microscopy techniques were used to study the incorporation of yttrium in BaTiO 3 , with the following nominal compositions: (Ba 1‐ x Y x )TiO 3 (0.015 ≤ to x ≤ to 0.08), (Ba 1‐ x Y x )Ti 1‐ x /4 ‐(□ Ti ) x /4 O 3 (0.005 ≤ to x ≤ to 0.1), and Ba(Ti 1‐ y Y y )O 3‐…
An electric double layer capacitor (EDLC) was prepared with an activated carbon powder electrode with poly(vinylidene fluoridehexafluoropropylene) (PVdF‐HFP) based gel electrolyte. Ethylene carbonate (EC) and propylene carbonate (PC) were used as plasticizer and tetraethylammonium tetrafluoroborate was used as thesupp…
Starting from the well known analytical formula for the eddy current losses in electrical steel laminations, saturation and edge effects are studied by means of 1D and 2D finite element models of a single lamination. A novel method for directly including the laminated core energy dissipation in a time stepped 2D model…
Computer simulations showed that the elastic modulus of the cell layer relative to the elastic modulus of the extracellular layers predicted the effectiveness of different force-generating mechanisms for sea urchin primary invagination [L. A. Davidson, M. A. R. Koehl, R. Keller, and G. F. Oster (1995) Development 121,…
Aqueous solutions containing 10 -3 M luminol and varying concentrations of hydrogen peroxide are irradiated with 20 kHz ultrasound at 50 °C. The intensity of sonogenerated chemiluminescence (SCL) is shown to increase linearly with ultrasound power and to be strongly pH dependent, reaching a maximum at pH 12. For pH <…
Low reflectivity (“black”) surface treatments for space-borne infrared systems are reviewed. The uses of black surfaces in general, as well as for specific space-borne applications are discussed. Compositions of a wide variety of surface treatments with examples of experimental data to characterize performances are pr…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPhotoresponsive Azobenzene-Containing Dendrimers with Multiple Discrete StatesDenise M. Junge and Dominic V. McGrathView Author Information Department of Chemistry, University of Arizona Tucson, Arizona 85721 Department of Chemistry, University of Connecticut Storrs, C…
Current through ${(\mathrm{P}\mathrm{b},\mathrm{L}\mathrm{a})(\mathrm{Z}\mathrm{r},\mathrm{T}\mathrm{i})\mathrm{O}}_{3}$ ferroelectrics on perovskite semiconductors is found to exhibit diode characteristics of which polarity is universally determined by the carrier conduction-type semiconductors. A persisting highly r…
Anodizing of magnesium was studied in solutions containing 3 M KOH + 0.6 M KF + 0.21 M Na 3 PO 4 , with and without addition of 0.4 M and 1.1 M of aluminate. At constant applied current, the process occurs in two stages. First, the voltage rises linearly until an initial breakdown occurs. A thin and compact oxide film…
The extracellular matrix (EMC) of muscle is composed mostly of the protein collagen with lesser quantities of other constituents such as proteoglycans also present. The focus of this brief review is the extracellular modification of collagen, critical to forming a stable matrix, called crosslinking. Enzyme-mediated co…
The application of the Jiles-Atherton hysteresis model for numerical modelling of measured magnetic hysteresis characteristics of constructional steel is investigated. Parameter identification is done using the stochastic optimization method "simulated annealing". Modifications of the original model, which were propos…
Low temperature vacuum deposition of tungsten carbide coatings, W1−yCy with compositions that varied from y=0 to 0.9, was investigated. Special attention was given to the production of nanocrystalline carbides with coatings of y&gt;0.5. Previous attempts at producing WC with excess carbon at near room temperatures…
Photo-assembly of reactive liquid crystals by simultaneous diffusion and polymerization can give rise to interesting new polymeric architectures. In this report, the authors summarize recent results, which show how deformation of the molecular helix in a cholesteric network can give rise to interesting new optical pro…
Epoxide hydrolases catalyze the cofactor-independent hydrolysis of reactive and toxic epoxides. They play an essential role in the detoxification of various xenobiotics in higher organisms and in the bacterial degradation of several environmental pollutants. The first x-ray structure of one of these, from Agrobacteriu…