Materials Literature
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In discrete systems the number density, defined as the number of particles per unit volume, is subject to fluctuations depending on the size and location of the sampling volume. Fluctuations in the local density or pair distribution function as determined from x-ray or neutron diffraction experiments, die out quickly…
NiTi-wire shape memory alloy (SMA) dampers, which utilize NiTi SMA wires to simultaneously damp tension, compression, and torsion, have been developed for structural control implementation in this study. First, three reduced-scale NiTi-wire SMA dampers were constructed. Then, mechanics analysis of the NiTi-wire SMA da…
Owing to the limited experimental resolution of data in macromolecular crystallography, ab initio phasing is successful only when atomic or quasi-atomic resolution data are available. It is shown that extrapolating the moduli and phases of non-measured reflections beyond and behind the experimental resolution limit ma…
Twisted-nematic liquid-crystal devices having high spatial resolution are suitable for spatial light modulators. Phase-modulation characteristics of the devices have been widely studied, but the phase delay calculated using a conventional Jones-matrix model is slightly different from that measured using an interferome…
Abstract A previous study has shown that the adhesion between the film and substrate of film‐insert injection‐molded poly(propylene) (PP) film/PP substrate was evident with the increases in barrel temperature and injection holding pressure. In this second part of the research work, the crystallinity at the interfacial…
We apply RISM (reference interaction site model) and PRISM (polymer-RISM) theories to calculate the site–site pair structure and the osmotic equation of state of suspensions of circular or hexagonal platelets (lamellar colloids) over a range of ratios of the particle diameter over thickness Dσ. Despite the neglect of…
Mass spectrometry, in particular MALDI-MS, has often been used as a valuable means to characterize dendritic molecules with respect to their molecular masses. Also, it is a valuable tool for analyzing potential defects in their structure which result from incomplete synthetic steps. This article presents a comparison…
Abstract The various weight ratios of collagen/chitosan were used to immobilize the various grafted amounts of acrylic acid (AA) grafted polypropylene nonwoven fabric. For a given value of grafting percentage of AA and the immobilizing time period, the values of the immobilizing percentage of collagen/chitosan are inc…
A library of G1-G3 alpha-amino acid based layer-block dendrons 1-6 containing different amino acid residues in the different concentric layers was prepared by solution-phase peptide synthesis. The structures of these dendrons were characterized by 1H and 13C NMR spectroscopy and, except for the G3 series of compounds,…
Abstract Summary: A novel method for the tailoring of unique three‐phase crystalline systems in isotactic poly(propylene) has been proven. It is based on a synergistic application of a specific β ‐nucleating agent and high pressure during crystallization. The formation of a γ phase was supported by elevated pressure a…
Magnetic, magnetocaloric, and magnetoresistance studies have been carried out on polycrystalline samples of Laves phase compounds $\mathrm{Ho}{({\mathrm{Ni}}_{1\ensuremath{-}x}{\mathrm{Fe}}_{x})}_{2}$ [$x=0$, 0.05, and 0.1]. The magnetocaloric effect in $\mathrm{Ho}{\mathrm{Ni}}_{2}$ is found to be maximum near the or…
Abstract Summary: Polyaniline‐vanadium oxide nanocomposite nanosheets with thickness between 10 and 20 nm, and lateral dimensions in the range of hundreds of nanometers to several microns have been synthesized by in situ intercalation polymerization of aniline with layered V 2 O 5 under hydrothermal conditions. The pr…
Mechanisms controlling environmental degradation and cracking in light-water-reactor (LWR) systems have been investigated by analytical transmission electron microscopy (ATEM) of cracks and crack tips. The current work focuses on intergranular stress corrosion cracking (IGSCC) of 300-series, austenitic stainless steel…
Tricopper tetrathioniobate(V), Cu3NbS4, has been synthesized by chemical transport reaction using iodine as the transport agent. The compound crystallizes in the sulvanite (Cu3VS4) structure type in space group P\overline 43m. The structure is composed of CuS4 and NbS4 tetrahedra sharing corners and edges.
Photoluminescence (PL) spectra of Eu(III) and Tb(III) complexes with mixed oxydiacetate (ODA) and 1,10-phenanthroline (phen) ligands and with homoleptic ODA reveal characteristic line-splitting at 10 K, depending on the site-symmetry of the lanthanide ion in the complex. The energy-level schemes of the <TEX>$^7F_J$</T…
A novel and easy crystal-mounting technique was developed for the sulfur SAD method using Cr Kalpha radiation (2.29 A). Using this technique, the cryo-buffer and cryoloop around the protein crystal can be removed before data collection in order to eliminate their X-ray absorption. The superiority and reproducibility o…
Syntheses, characterization and properties of expanded corrole-ferrocene conjugates are reported. Ferrocenyl group are covalently linked to the corrole macrocycle through three different spacers groups. The synthetic strategy involved prior insertion of ferrocene with spacers to the dipyrromethane unit followed by a "…
Polymer deposition is a serious problem associated with the etching of fused silica by use of inductively coupled plasma (ICP) technology, and it usually prevents further etching. We report an optimized etching condition under which no polymer deposition will occur for etching fused silica with ICP technology. Under t…
Abstract Various trifluoromethylated porphyrins can be conveniently synthesized in high yields by the reaction of brominated porphyrins with FSO 2 CF 2 COOMe/CuI in the presence of catalytic amounts of Pd 2 (dba) 3 · CHCl 3 /AsPh 3 . (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
Corrole-manganese(V)-oxo intermediates were produced by laser flash photolysis of the corresponding corrole-manganese(IV) chlorate complexes, and the kinetics of their decay reactions in CH2Cl2 and their reactions with organic reductants were studied. The corrole ligands studied were 5,10,15-tris(pentafluorophenyl)cor…