Materials Literature
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The morphological evolution of the inorganic crystals (Ba(NO 3 ) 2, NH 4 Cl, H 3 BO 3, and K 2 Cr 2 O 7 ) was demonstrated in various kinds of organic gel media (agar, gelatin, pectin, and poly (vinyl alcohol)). As the gel density increased, the morphology grown in the gel matrix remarkably changed from polyhedral sin…
A new approach to analyzing macromolecular single-crystal X-ray diffraction intensity statistics is presented. Instead of considering reflections in resolution shells, differences between local pairs of reflection intensities are taken and normalized separately. When the two reflections to be compared (having intensit…
The formation of nanostructured materials through the assembly of nanocrystals is described, focusing in particular on silica and other metal oxide coated core particles. The preparation and optical characterization of core−shell materials are reviewed, and some of the unique properties of core−shell materials are pre…
Data available on the fd-transition energies of Ce 3+ in inorganic compounds are compared with those of Eu 2+ in the same compounds. Despite differing charge compensating defects, clear correlation was found. The redshift of absorption, the Stokes shift of emission, the centroid shift of the 5d configuration and the t…
Performances of LaCo x Fe 1-x O 3 perovskites as catalysts in dry reforming of ethane have been studied. Depending on x, the crystalline structure of the perovskite can be either orthorhombic or rhombohedral. The catalytic activity of the perovskite is tightly linked to its structure. If x ≤ 0.5 the reducing catalytic…
We theoretically investigate the modulation of carrier mobility in quasi-one dimensional organic crystals that consist of linear chains of conducting molecules. Two major electron-phonon interaction mechanisms are included in our model. It is shown that under certain conditions, the interplay of these two mechanisms m…
This paper describes the investigation results of semiconducting glaze porcelain and silicone rubber polymer insulators removed from the transmission line under a heavy contaminated condition, the suburbs of Tianjin in China for 5 years in order to evaluate the long-term reliability of these insulators. Specimen insul…
The atomic and electronic structures of IV-VI semiconductor clusters ${\mathrm{Ge}}_{n}{\mathrm{Te}}_{m}(n+m<~10)$ are investigated using a real-space higher-order finite-difference ab initio pseudopotential method. Langevin molecular dynamics coupled to a simulated annealing procedure allows us to find the geometr…
A theoretical investigation is made of the plasmon propagation in the coaxial cylindrical geometries using Green function (or response function) theory in the absence of an applied magnetic field. The plasmon excitations in such multiple interface structures are characterized by the electromagnetic (EM) fields that ar…
Ionic residues influence the stability of collagen triple helices and play a relevant role in the spontaneous aggregation of fibrillar collagens. Collagen types I and II and some of their CNBr peptides were chemically modified in mild conditions with two different protocols. Primary amino groups of Lys and Hyl were N-…
Abstract The melting behavior of polyglycolide (PGA) with eight other biodegradable polymers was investigated to determine whether forming a blend could be used as a method of lowering the melting point of PGA. Blends were prepared by melt processing in differential scanning calorimetry (DSC) pans and were then analyz…
Carbon nanostripes of graphene structure prepared on the stepped Ni(771) surface have been studied by angle-resolved photoemission. The electronic structure is anisotropic: parallel to the stripe direction, a graphite-type dispersion is measured, whereas the perpendicular direction displays two entangled band structur…
Images of typical cationic flocculants of high molecular weight, poly[2-(acryloyloxy)ethyl(trimethyl)ammonium chloride] (PATC), adsorbed on mica surface in situ in water were observed by tapping-mode atomic force microscopy (AFM) under various conditions. The corresponding interaction forces between surfaces were meas…
We report observations of unusual and complex structures recorded on the surface of azo-dye-doped elastomer thin films after irradiation with different interference light patterns. Periodic structures with a variety of topography are inscribed through holographic recording by both intensity light patterns and polariza…
A detailed investigation of the characteristic current-voltage (I-V) curve and electronic switching effect in chalcogenide-based phase-change memory devices is presented. An original bandgap model of both crystalline and amorphous chalcogenide and a physical picture of the fundamental effects involved in device operat…
[reaction: see text] The dicorannulenobarrelene 1 was synthesized with the final step achieved by a nickel-mediated fourfold intramolecular coupling of dibromomethyl with bromomethyl groups. Low-temperature (1)H NMR spectra of 1 show a presence of three conformers with approximate populations of 0.82:0.13:0.05, in goo…
The 57 Fe Mössbauer quadrupole splittings (Δ E Q ) and isomer shifts (δ Fe ) in 3-coordinate high-spin Fe(II) complexes are unusually small, and previous attempts to reproduce their Δ E Q values have been unsuccessful. We show here that, by using large structural models and basis sets, both Δ E Q and δ Fe values can b…
All homogeneous sphere packings and all interpenetrating sphere packings have been derived that refer to the seven invariant and the 23 univariant lattice complexes belonging to the hexagonal crystal family. The respective sphere packings may be assigned to 66 types. In addition, one case of interpenetrating sphere pa…
Abstract Sisal fibers were benzylated under different conditions and were characterized with infrared spectroscopy, X‐ray diffraction, thermal analysis, and scanning electron microscopy. The benzylation reaction was monitored by the mass gain as a function of the reaction time. In the first stage, there was a mass los…
Structures and energetics of several types of all-carbon peapods made by C 60 s encapsulated inside single-wall carbon nanotubes are calculated. The interactions between the tubes and the molecules determine a minimal diameter for exothermic encapsulation of 11.74 Å and a radial deformation of the C 60 cage that is a…