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The design of narrow bandgap polymers remains a major challenge in the field of organic conductors. An alternative scheme is proposed for reducing the bandgap, namely the construction of a one‐dimensional graphitelike chain. Terthienyl frozen in a fully planar syn conformation is used as a simplified model compound fo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of Polyelectrolyte Stars and Convex Polyelectrolyte BrushesSanjay Misra, Wayne L. Mattice, and Donald H. NapperCite this: Macromolecules 1994, 27, 24, 7090–7098Publication Date (Print):November 1, 1994Publication History Published online1 May 2002Published inissue…
An EXAFS (extended x-ray-absorption fine structure) study of nanocrystalline iron prepared by high-energy ball milling is presented. Accurate data analysis has been performed using a recently developed ab initio multiple-scattering method (GNXAS). The crystalline iron EXAFS spectrum, taken as reference, has been analy…
Changes in pH, chloride (Cl–) concentration, and potential inside a rectangular crevice of metal against polymethyl methacrylate (PMMA) were monitored using microelectrodes as a function of time and externally applied potential. The environment inside the crevice was altered within the experimental time frame only whe…
The acoustic effects of free-running 2.12 μm Cr:Tm:Ho:YAG laser pulses delivered in water are studied. Laser pulses of 10 to 1200 mJ energy and 230 μs duration (full width at half-maximum) are used. Delivery fiber diameters of 200–600 μm are investigated. Combined fast flash video imaging and needle probe hydrophone p…
The statistical analysis of data in the form of orientations is a relatively new discipline and results from the literature on this subject are not yet widely known outside the statistics community. This paper provides an introduction to and the key references for statistical methods for analysing orientation data. Mo…
Abstract The experimental data obtained for the nucleation of microcellular foams are compared with the theoretical model developed in the first part of this paper. Polystyrene (PS) with rubber particles as nucleation sites is used as an exploratory system. Nitrogen is used as a physical blowing agent to nucleate the…
The effect of supramolecular structure and morphology on the solid state luminescence of polymers is explored through a rod-coil copolymer system, poly(benzobisthiazole-1,4-phenylene-co-benzobisthiazole decamethylene), which forms nanocomposites at compositions below 50 mol% rods. The composition dependence of the pho…
The hypothesis that a synergistic effect by fine SiC dispersoids operating on the submicrometer scale is capable of enhancing the deformation and fracture properties of Si 3 N 4 ceramics has been examined. In order to single out the effect of the SiC dispersion from other microstructural factors affecting the material…
Multilayer chip inductors were characterized using analytical electron microscopy. The chip inductors consist of silver internal electrode sandwiched between low‐temperature‐fired, Ni‐Zn‐Cu ferrite layers. It was found that the cooling rate affected the inductance of the chip inductor. Elastic strain fields were obser…
As third-generation synchrotron facilities are constructed and go online both in the US and in foreign countries, even more applications of synchrotron radiation will be realized. Both basic and applied research possibilities are manyfold, including studies of materials mentioned below and those that are yet to be per…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxometalate Catalysis of the Aerobic Oxidation of Hydrogen Sulfide to SulfurMason K. Harrup and Craig L. HillCite this: Inorg. Chem. 1994, 33, 24, 5448–5455Publication Date (Print):November 1, 1994Publication History Published online1 May 2002Published inissue 1 November…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the Influence of the Morphological Structure on the Liquid Crystalline Behavior of Liquid Crystalline Side Chain Block CopolymersH. Fischer, S. Poser, M. Arnold, and W. FrankCite this: Macromolecules 1994, 27, 24, 7133–7138Publication Date (Print):November 1, 1994Publicat…
The magnetic properties of a series of Nd2Fe17−xAlx solid solutions, with x equal to 2.04, 4.01, 5.97, 7.94, and 9.06, have been studied by magnetic measurements, neutron diffraction, and Mössbauer spectroscopy. Magnetization studies indicate that the Curie temperature increases from 330 K in Nd2Fe17 to a maximum of ∼…
The mechanism and control of ferroelectric polarization fatigue (loss of polarization with cycling) in donor- and acceptor-doped BaTiO3 ceramics and Pb(Zr1−xTix)O3 (PZT) thin films has been investigated. Experimental results clearly demonstrate that fatigue behavior is related to the defects within the materials. Dono…
I report significant improvements to the differential method of Chandezon et al. [ J. Opt. Soc. Am.72, 839– 846 ( 1982)]. The R-matrix propagation algorithm is used to remove completely the previously existing limitations on the total coating thickness and on the total number of coated layers. I analyze the symmetry p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFacile Synthesis of meso-Tetrakis(perfluoroalkyl)porphyrins: Spectroscopic Properties and X-ray Crystal Structure of Highly Electron-Deficient 5,10,15,20-Tetrakis(heptafluoropropyl)porphyrinStephen G. DiMagno, R. Allen Williams, and Michael J. TherienCite this: J. Org. Chem.…
In the following text an attempt has been made to condense the main points of the MEIPIC-2 conference, to correlate certain results scattered over different contributions, to give some comments, suggestions for future work and a few historical reference points. Those contributions which have been less discussed, refle…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlternating Chains with Ferromagnetic and Antiferromagnetic Interactions. Theory and Magnetic PropertiesJuan J. Borras-Almenar, Eugenio Coronado, Jacques Curely, Roland Georges, and Jean Claude GianduzzoCite this: Inorg. Chem. 1994, 33, 23, 5171–5175Publication Date (Print):…
The synthesis and (chir)optical properties of a highly regioregular optically active 3-substituted polythiophene are reported. Using the McCullough method a regioselectivity of more than 98% is found for the head-to-tail coupling in 3-[2-((S)-2-methylbutoxy)ethyl]polythiophene 1. Contrary to the small effects observed…