Materials Literature
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Measurements of the temperature dependence of the thermal conductivity $\ensuremath{\kappa}(T)$ of the antiferromagnetic perovskites ${\mathrm{SmNiO}}_{3},$ ${\mathrm{CaMnO}}_{3},$ ${\mathrm{LaMnO}}_{3},$ and ${\mathrm{YCrO}}_{3}$ are compared to that of the nonmagnetic perovskite ${\mathrm{LaGaO}}_{3}.$ Whereas ${\ma…
New highly stable benzo-fused m-trifluoromethylphenyl porphyrazines and their complexes with Mg and In were synthesized by cross-condensation of phthalonitrile and bis(m-trifluoromethylphenyl)fumaronitrile. Their 1H and 13C NMR spectra were recorded and described. The Q- and B-bands in the UV/Vis spectra of the metal…
Mixed magnetic systems $({\mathrm{CH}}_{3}{)}_{2}{\mathrm{CHNH}}_{3}\mathrm{Cu}({\mathrm{Cl}}_{x}{\mathrm{Br}}_{1\ensuremath{-}x}{)}_{3}$ are good candidates for experimental studies of the effect of bond randomness in both the Haldane state and the singlet dimer state. We investigated the magnetization process in the…
We have studied the optical anisotropy of porphyrin layers with different thicknesses deposited onto gold substrates by the Langmuir−Schaefer technique. In coincidence with the Soret band of the molecule, the optical spectral line shape as determined by reflectance anisotropy spectroscopy exhibits a characteristic, la…
Abstract A comparative study of the crystallization and orientation development in injection molding isotactic and syndiotactic polypropylenes was made. The injection molded samples were characterized using wide angle X‐ray diffraction (WAXD) techniques and birefringence. The injection molded isotactic polypropylene s…
New poly(arylene ether amide)s with trifluoromethyl pendent groups were prepared via nucleophilic nitro displacement reaction of AB-type monomers. 4-Nitro-3-trifluoromethyl-[N-(4-hydroxyphenyl)]benzamide (3) and 4-nitro-3-trifluoro-methyl-[N-(3-hydroxyphenyl)]benzamide (4) gave polymers with weight-average molecular w…
Abstract Quantitative XPS data complemented by low‐energy electron diffraction (LEED) and scanning tunnelling microscopy (STM) results of the very first stages of oxidation of an NiAl(001) single‐crystal surface are reported. The thickness, stoichiometry and alloy composition at the oxide/alloy interface and, when pos…
This paper presents the image analysis algorithms developed for a microscopy system that specifically evaluates cotton properties from longitudinal views. The system uses a motorized stage to transport a sample slide to grab sequential images of fiber segments, transversely scans the detected fibers in the images, and…
Abstract In this research work, a comparative x‐ray photoelectron spectroscopy (XPS) analysis has been performed on three allotropic carbon materials i.e. amorphous carbon films, graphite crystals and chemically vapour deposited (CVD) diamond films. These studies have shown that XPS is one of the most powerful techniq…
β-octamolybdate [Mo 8 O 26 ] clusters have been assembled, under hydrothermal conditions, into a variety of interesting one-dimensional structures.
Let us start with a very basic question that most students would ask when they first hear the terms “nonlinear optics ” or “optical nonlinearity”:
A comparative study of the structure and topography of charge density in the squarate and croconate dianions has been carried out on the basis of low-temperature X-ray diffraction measurements. Both the dianion rings exhibit a high degree of planarity with uniform C−C bond lengths and angles. The bond critical points…
Die Reaktion von Hg(NO3)2 mit K[B(CN)4] führt zu Hg[B(CN)4]2 (1). Eine Komproportionierungsreaktion von 1 mit elementaren Quecksilber liefert das entsprechende Quecksilber(I)-Salz Hg2[B(CN)4]2 (2). Die Charakterisierung von 1 und 2 erfolgt anhand von Schwingungsspektren, 13C- und 11B-NMR-Spektren sowie der Auswertung…
Strategies to treat atherosclerotic coronary artery disease include coronary artery bypass grafting (CABG), in which grafts are used to bypass atherosclerotic vessels and restore blood flow to the ischemic myocardium. The grafts used include healthy arteries or veins harvested from a separate site. Results with arteri…
The diffusion coefficients of polyamidoamine (PAMAM) dendrimers (generations 0−4) surface-modified with terpyridyl and bipyridyl ruthenium complexes were determined using cyclic voltammetry (CV), voltammetry at a rotating disk electrode (RDE), and pulsed field gradient spin−echo nuclear magnetic resonance (PFGSE-NMR).…
Abstract A higher concentration of H2O2 solution (>1 wt%) was catalytically and directly synthesized from O2 and H2 over a [active carbon+vapor-grown-carbon-fiber] cathode by a new type of fuel cell system at 1 atm.
Some technical ceramics exhibit the R-curve effect, i.e., an increasing fracture resistance with crack extension which is a desirable material property because more energy is necessary to propagate a microscopic crack. The objective of this study was to prove whether dental ceramic materials exhibit R-curve behavior.…
Three phase diagrams of binary systems are presented where one of the mixing components is a bent-core mesogen and the other is a calamitic mesogen. In two of these systems transitions between the ‘banana phase’ B2 and more usual smectic phases in the sequences B2-SmA, B2-SmC, B2-SmC-SmA, B2-SmC-SmA-N could be observe…
The interactions of nitric oxide gas with thin layers of Fe(II)(TPP) and Ru(II)(TPP), obtained by sublimation onto low-temperature substrate (77 K), has been investigated by means of IR spectroscopy (TPP = meso-tetraphenylporphyrinate). Only simple addition of NO to form Fe(TPP)(NO) is observed for the iron-porphyrin…
We investigate theoretically charge ordered states on the anisotropic triangular lattice characteristic of the theta-(BEDT-TTF)_2 X materials. Using exact diagonalization studies, we establish that the charge order (CO) pattern corresponds to a ``horizontal'' stripe structure, with ...1100... CO along the two directio…