Materials Literature
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Crystallography at sub-atomic resolution permits the observation and measurement of the non-spherical character of the electron density (parameterized as multipoles) and of the atomic charges. This fine description of the electron density can be extended to structures of lower resolution by applying the notion of tran…
The electrochemistry of (OEC)M where M = Mn, Co, Ni, or Cu and OEC is the trianion of 2,3,7,8,12,13,17,18-octaethylcorrole was investigated in dichloromethane, benzonitrile, or pyridine, and the oxidized compounds were characterized by UV−visible and/or ESR spectroscopy. The first two oxidations of the Co, Ni, and Cu…
Optimized syntheses of 5,15-diphenylporphyrin (DPP, 1) and its dipyrrolic precursors are described. A novel procedure for the synthesis of dipyrromethane (2), prepared by hydrodesulfurization of the corresponding di-2-pyrrolylthione (8), is presented, as well as an improved method to isolate large quantities of 5-phen…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSynthesis and Properties of the Longest Oligothiophenes: The Icosamer and HeptacosamerHidetaka Nakanishi, Naoto Sumi, Yoshio Aso, and Tetsuo OtsuboView Author Information Department of Applied Chemistry, Faculty of Engineering, Hiroshima University, Higashi-Hiroshima 7…
Analysis of data on the chemical composition of primary fluid inclusions (brine inclusions) in primary‐bedded halite from many evaporite formations of northern Pangea shows that during the Phanerozoic the chemical composition of marine brines was oscillating significantly between the Na‐K‐Mg‐Ca‐Cl type and the Na‐K‐Mg…
Fourier transform infrared spectroscopy and X‐ray photoelectron spectroscopy were used to monitor the chemical composition of both ladder and cage hydrogen silsesquioxane (HSQ) as a function of bake and cure temperature in the range 150–425°C. Three distinct chemical compositions evolve as the temperature of the HSQ f…
The unique structure and reactivity of cellulose opens up various possibilities for the design of advanced materials based on this biomacromolecule. In the present feature the state of the art of selected cellulose functionalization reactions is discussed adequately considering own research results. In particular, new…
Biological apatite-crystal formation is a complex process starting with heterogeneous nucleation of inorganic calcium phosphate on an organic extracellular matrix [Cuisinier et al. (1995), J. Cryst. Growth, 156, 443-453]. Further stages of crystal growth are also controlled by the organic matrix and both nucleation an…
A phenol-based “end-off” compartmental ligand, 2-[ N, N -di(2-pyridylmethyl)aminomethyl]-6-{ N -[2-(dimethylamino)ethyl]iminomethyl}-4-methylphenol (HL), having an iminic bidentate and an aminic tridentate chelating arms on the 2- and 6-positions of the phenolic ring, respectively, forms dinuclear nickel complexes [Ni…
The flow properties of suspensions of weakly attractive particles are investigated as a function of volume fraction and strength of interparticle attraction. The suspensions are composed of uniform silica spheres with covalently bound octadecyl chains with diameters 100–125 nm suspended in decalin and tetradecane. At…
The adaptive finite-element method proposed in our previous work [Phys. Rev. B 54 (1996) 7602] is extended to fully self-consistent calculations of realistic materials. Our method is highly adaptive, sparse, parallel, and suited for the O(N) methods, thanks to the localized finite-element basis functions. Accurate ion…
Ammonium is an important nitrogen source for many microorganisms and plants. Ammonium transporters whose activity can be probed with [14C]methylammonium have been described in several organisms including some cyanobacteria, and amt genes encoding ammonium/methylammonium permeases have been recently identified in yeast…
We have used Brillouin light scattering (BLS) to measure the room-temperature, high-frequency mechanical properties of thin freely standing polystyrene (PS) films. We have investigated the effects of chain confinement and the free surface on the mechanical properties by measuring the velocity of film-guided acoustic p…
A finite element formulation using an elastoplastic polycrystal constitutive theory is presented. The crystal constitutive equations are expressed in an intermediate configuration obtained by unloading the deformed crystal without rotation from the current configuration to a stress-free state through small elastic str…
We present an improved quantitative mobility spectrum analysis (i-QMSA) procedure for determining free electron and hole densities and mobilities from magnetic-field-dependent Hall and resistivity measurements on bulk or layered semiconductor samples. The i-QMSA technique is based on a fundamentally new approach, whic…
Kinetic analyses for the solid‐state reactions of reactant particles in an assemblage with a particle‐size distribution (PSD) have been reexamined for the reactions that proceed by the advance of the reaction interfaces inward toward the center of the individual reactant particles. The experimental kinetic curves for…
At embryo implantation, it is postulated that the initial contact between blastocyst and maternal tissues is by adhesion of the trophoblast to the uterine epithelium. This cell-to-cell interaction is thought to be critical for implantation, although the actual adhesive forces have never been determined. In the present…
The unique structure and reactivity of cellulose opens up various possibilities for the design of advanced materials based on this biomacromolecule. In the present feature the state of the art of selected cellulose functionalization reactions is discussed adequately considering own research results. In particular, new…
Available data suggest that drugs should be delivered to a vascular lesion at a high concentration over an extended period of time to control vascular smooth muscle cell (VSMC) proliferation. This study was undertaken to formulate a paclitaxel, an antimicrotubule agent, into a biodegradable poly (ethylene oxide)-poly(…
Experimental results for a carbonated, high-CaO evolved nephelinite at 0.2 and 0.5 GPa at 900–1040°C are presented. Immiscible carbonate and silicate liquids are in equilibrium with a variety of crystal phases (clinopyroxene, nepheline, melilite, wollastonite, perovskite, melanite garnet, titanite, Fe-rich spinel, apa…