Materials Literature
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Abstract Summary: Various crystalline textures have been identified in a crystallizable block copolymer system, polystyrene‐ block ‐[syndiotactic poly(propylene)] (PS‐sPP), having a glass‐transition temperature of PS ( T g,PS ) located in the midst of the sPP crystallization window. A confined morphology for the cryst…
In situ Raman spectroscopy was used to explore the mechanical stability and electronic properties of superhard boron suboxide (B6O) under nonhydrostatic pressure. B6O stabilizes in a rhombohedral structure (R3¯m) to the peak pressure of 90GPa. The icosahedra-chain (B–O) phonon at 274cm−1 exhibits a negative pressure d…
Synthesis of fully hydrophilic star-shaped macromolecules with different kinds of arms (A(x)B(y)C(z)) based on polyglycidol (PGL, A(x)) and poly(ethylene oxide) (PEO, C(z)) arms and diepoxy compounds (diglycidyl ethers of ethylene glycol (DGEG) or neopentyl glycol (DGNG) in the core, B(y)) forming the core is describe…
We have investigated the characteristics of Au Schottky contacts to ZnO:N layers grown on ͑0001͒ GaN/Al 2 O 3 substrates by plasma-assisted molecular-beam epitaxy.It is found that the Schottky characteristics are dependent on the growth temperature and polar direction of ZnO:N layers.The Schottky barrier height for th…
Three rotaxanes, with axles with two zinc porphyrins (ZnPs) at both ends penetrating into a necklace pending a C60 moiety, were synthesized with varying interlocked structures and axle lengths. The intra-rotaxane photoinduced electron transfer processes between the spatially positioned C60 and ZnP in rotaxanes were in…
A supported-metal catalyst can be considered as a mixture of three homogeneous phases: support, void and metal. Information about the metal phase alone can be obtained using anomalous small-angle X-ray scattering (ASAXS), which requires measuring the SAXS for two different wavelengths near the metal's absorption edge.…
Abstract Summary: A sequential two‐step method was successfully used for the photografting of methyl methacrylate/1,2‐divinylbenzene (MMA/DVB) microemulsion onto the surface of a poly(propylene) (PP) film. Atomic force microscopy (AFM) images showed that nanoparticles with a cross‐section diameter of 60 nm were direct…
Abstract New methods for the formation of multiple surface structures in polyolefins were developed both at the molecular and macromolecular levels, which produced a high local nonuniformity of surface properties. In particular, I obtained varied molecular structures at the surface as a result of consecutive heteropha…
The predicted transcriptional regulatory factor for the fibroin gene of the silkworm Bombyx mori, fibroin-modulator-binding protein-1 (FMBP-1), was purified by sequential DNA affinity column chromatography, and cDNA clones corresponding to FMBP-1 were isolated from a library. The N-terminal half of FMBP-1 has a weak s…
From pure powders of forms I and II of phenobarbital, X-ray diffraction patterns were recorded at room temperature. The starting crystal structural models were found by a Monte-Carlo simulated annealing method. The structures of the two forms were obtained through Rietveld refinements. Soft restraints were applied on…
A temperature-controlled X-ray powder diffraction experiment, complemented with TGA and DSC analysis, allowed us to follow changes in the molecular conformation and hydrogen-bond patterns of 4-piperidinecarboxylic acid. The presence of three phases is confirmed. Phase 1 represents the monohydrated form of 4-piperidine…
Abstract Summary: A novel approach of in situ polymerization and in situ compatibilization was adopted to prepare poly(2,6‐dimethyl‐1,4‐phenylene oxide) (PPO) and polyamide 6 (PA6) nanoblends. Anionic ring‐opening polymerization of ε ‐caprolactam was carried out in the presence of PPO, the chain of which bore p ‐metho…
We present a theoretical approach which maps polymer blends onto mixtures of soft-colloidal particles. The analytical mesoscale pair correlation functions reproduce well data from united atom molecular dynamics simulations of polyolefin mixtures without fitting parameters. The theory exactly recovers the analytical ex…
The violet pigment methylbenzimidazolonodioxazine, C22H12Cl2N6O4 (systematic name: 6,14-dichloro-3,11-dimethyl-1,3,9,11-tetrahydro-5,13-dioxa-7,15-diazadiimidazo-[4,5-b:4',5'-m]pentacene-2,10-dione), shows an X-ray powder diagram consisting of only ca 12 broad peaks. Indexing was not possible. The structure was solved…
The effects of mechanical polishing on the photoluminescence (PL) from each polar face of wurtzite-structure ZnO are presented. Differences observed for the 4.2K PL of a mechanically polished surface when compared to that of a chemomechanically polished surface include broadened bound-exciton peaks, hot-exciton lumine…
High-resolution spectroscopy of ${\mathrm{Nd}}^{3+}$ in ${\mathrm{Nd}}_{2}\mathrm{Ba}\mathrm{Ni}{\mathrm{O}}_{5}$ and ${\mathrm{Y}}_{2}\mathrm{Ba}\mathrm{Ni}{\mathrm{O}}_{5}:\mathrm{Nd}(5%)$ powder samples is used to study ${\mathrm{Nd}}^{3+}$ crystal-field levels and exchange splittings in these quasi-one-dimensional…
The synthesis of biodegradable polyesters for biomedical applications in supercritical dioxide has been the subject of a number of recent publications. However, systematic studies of the mechanism of polymerization in this novel medium are rare. In this work, we present the first systematic study of the ring-opening p…
The interaction between metaphosphate chains and the metal ions Ca2+ and Eu3+ has been studied in water by Eu3+ luminescence, infrared absorption, and 31P NMR spectroscopy. Two main families of sites could be identified for the metal ions in the aqueous polyphosphate colloidal systems: (1) cagelike sites provided by t…
In this study, the in vitro corrosion resistance of a superferritic stainless steel in naturally aerated Hank's solution at 37 degrees C has been determined to evaluate the steel for use as a biomaterial. The potentiodynamic polarization method and electrochemical impedance spectroscopy (EIS) were used to determine th…
The internal field patterns for gold shells filled with the same material as the surrounding medium are calculated with Mie theory and in the quasistatic approximation and their properties compared to the response of homogeneous spheres and metallic rings. One major difference between the sphere and shell case is that…