Materials Literature
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Different microstructures in Si 3 N 4 ceramics containing Y 2 O 3 and Al 2 O 3 as sintering additives were prepared by two‐step sintering. Pull‐out and elastic bridging were most frequently observed as the toughening mechanisms in samples with fine‐grained microstructures having needlelike β‐Si 3 N 4 grains with diame…
The complex dielectric function, ε(E)=ε1(E)+iε2(E), of hexagonal CdSe has been measured by spectroscopic ellipsometry in the photon-energy range between 1.2 and 5.3 eV at room temperature. The measured spectroscopic-ellipsometry data are analyzed on the basis of a simplified model of the interband transitions. The mod…
A methodology for assessing constituent properties of ceramic matrix composites (CMCs) from stress/strain curves is developed. The procedures demonstrate how the properties of the interface and the misfit strain can be related to the unload/reload hysteresis and the permanent strain. The approach is illustrated in com…
Abstract Poly(3, 4‐ethylenedioxythiophene) (PEDT) is a new polymeric organic conductor which, when combined with polystyrene sulphonic acid, produces a system that can be processed as an aqueous solution and yields effective antistatic coatings for films. The antistatic effect is achieved with coating weights of just…
Abstract Diagenetic clay minerals usually occur as heterogeneous assemblages of submicroscopic layers consisting of different structure types such as illite, smectite and chlorite, with variable composition within a given structure type, and with highly variable concentrations of imperfections. The dimensions of mixed…
Pressure-induced structural transformations in semiconductor nanocrystals are examined. High-pressure Raman spectroscopy, EXAFS, X-ray diffraction, and optical absorption are discussed as methods for studying these transformations in CdSe, CdS, and Si nanocrystals. In these nanocrystal systems, each technique shows an…
In situ current density mapping, scanning electron microscopy, and energy dispersive spectroscopy were used to study the effects of cerium as a corrosion inhibitor for an aluminum copper alloy (Al 2024‐T4) in chloride containing solutions. It was found that cerium inhibits corrosion of this alloy by reducing the rate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphology of ABC Triblock CopolymersWei Zheng and Zhen-Gang WangCite this: Macromolecules 1995, 28, 21, 7215–7223Publication Date (Print):October 1, 1995Publication History Published online1 May 2002Published inissue 1 October 1995https://pubs.acs.org/doi/10.1021/ma00125a02…
Raman spectra of highly oriented pyrolytic graphite (HOPG) and pyrolytic graphite (PG) have been investigated in the region between 200 and 7000 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$. The high signal-to-noise ratio measurements reveal the existence of new bands in the fundamental and the higher-order regions. The…
During the preparation process of the glass-covered magnetic amorphous wires, axial, radial, and azimuthal internal stresses are induced, determining their magnetic properties. We have proposed a calculation method of the internal stresses induced during the solidification of the metal and during the cooling from the…
The modifications of the crystallographic and magnetic structures of PrNi${\mathrm{O}}_{3}$ associated with the decrease of the metal-insulator transition temperature, ${T}_{\mathrm{MI}}$, with external pressure (${P}_{\mathrm{ext}}\ensuremath{\approx}5$ kbar) have been investigated by means of neutron powder diffract…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
The synthesis of the metal-free and the dihydroxysilicon derivatives of tetrakis[4’,5’-bis(decoxy)benzo-18-crown-6]phthalocyanine is described. The metal-free phthalocyanine is liquid crystalline and exhibits a crystalline phase to mesophase transition at 148 °C. The structures of the crystalline phase and the mesopha…
The attachment and growth of L-929 cells on films made of Bombyx mori silk proteins--fibroin and sericin and their mixtures--was studied by a cell culture method. Both cell attachment and growth were dependent on a minimum of around 90% sericin in the mixture. The results from electron micrography as well as from the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic Engineering of Carbon NanostructuresNelly M. Rodriguez, Alan Chambers, and R. Terry K. BakerCite this: Langmuir 1995, 11, 10, 3862–3866Publication Date (Print):October 1, 1995Publication History Published online1 May 2002Published inissue 1 October 1995https://pubs…
We have performed a molecular dynamics computer simulation of a supercooled binary Lennard-Jones system in order to compare the dynamical behavior of this system with the predictions of the idealized version of mode-coupling theory (MCT). By scaling the time t by the temperature dependent \ensuremath{\alpha}-relaxatio…
Abstract Pulsed‐laser polymerization (PLP) in conjugation with molecular weight distribution (MWD) measurement has emerged as the method of choice for determining the propagation rate coefficient k p in free‐radical polymerizations. Detailed guidelines for using this technique (including essential internal consistency…
Abstract Numerous BuSnCl , Bu 2 SnCl , and Bu 3 SnCl‐initiated polymerizations of cyclo(tri‐methylene carbonate) (TMC) were conducted in bulk. In addition to the initiator, reaction time, temperature, and monomer/initiator (M/I) ratio were varied. Yields above 90% were obtained with all three initiators, but their rea…
Abstract The crystallization of the monotropic liquid crystal forming polyether, poly‐ n ‐nonyl‐4 4′‐biphenyl‐2‐chloroethane, was investigated using DSC calorimetry and polarizing optical microscopy. The principal theme was the nature of crystallization from the nematic liquid crystalline state, which in the monotropi…
Abstract The synthesis of high glass transition temperature ( T g > 300°C), amorphous, soluble, poly‐imide oligomers of controlled molecular weight endcapped with 4‐phenylethynylphthalic anhydride endcapping agent is described. The 4‐phenylethynylphthalic anhydride was employed to afford a higher curing temperature…