Materials Literature
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We report the detailed study of mechanically induced free radical (mechanoradical) formation of glucose-based polysaccharides such as cellulose and amylose based on electron spin resonance (ESR) on its comparison with plasma-induced radicals of polysaccharides. The observed ESR spectra of mechanically fractured sample…
SiC/SiC minicomposites that comprise different pyrocarbon/silicon carbide ((PyC/SiC) n ) multilayered interphases and a tow of SiC fibers (Hi‐Nicalon) have been prepared via pressure‐pulsed chemical vapor infiltration. Pyrocarbon and SiC were deposited from propane and a CH 3 SiCl 3 /H 2 mixture, respectively. The mic…
The synthesis and structural, chemical, and transport properties of a new clathrate compound with elemental composition Cs 8 Zn 4 Sn 42 is reported. This compound is cubic with space group Pm 3̄ n and a lattice parameter of 12.1226(19) Å. Single-crystal X-ray diffraction and structural refinement indicate that Cs atom…
Summary Accessibility of adsorbates to internal active sites of soils depends mainly on the porous structure of the material. We aimed to determine the distribution of pore sizes in soils with varied physico‐chemical properties, by combining adsorption of gases and mercury porosimetry. Microporosity was studied by phy…
Abstract The composition, texture and genetic evolution of kerolite and related Mg clays belonging to the Intermediate Unit of the Miocene from the Madrid Basin have been studied. About 400 samples from the Esquivias deposit were analysed by several mineralogical and/or chemical techniques. Two genetic pathways for th…
We report the thickness and annealing temperature dependence of the structural, morphological, compositional, and electrical properties including ferroelectric characteristics of Pb(Zr0.52Ti0.48)O3 thin films deposited by a sol-gel method. The thickness and annealing temperature of the films were in the range of 0.12–…
A thin-layer electrochemical flow cell coupled on-line with electrospray mass spectrometry (EC/ES-MS) was used to investigate the soluble products from the controlled-potential anodic polymerization of aniline in H(2)O and H(2)O/CH(3)OH (1/1 v/v) with ammonium acetate and acetic acid or ammonium hydroxide as electroly…
Abstract A conducting polymer having photochromic diarylethene units in the main chain was synthesized. Reversible photochromism was observed in solid film, and photoluminescence and electrical conductivity were found to change along with the photoisomerization.
The structural and electronic properties of some simple ternary oxides with the delafossite-type structure have been investigated using the periodic Hartree−Fock method and a posteriori density-functional corrections. The coexistence in the same crystal structure of different structural motifs, such as MO 6 octahedra,…
We investigate the depletion induced phase separation in mixed suspensions of colloidal spheres with diameter σ and colloidal rods with length L and diameter D. Using an extension of the free volume method developed by one of us [H.N.W. Lekkerkerker and A. Stroobants, Physica A 195, 387 (1993)], we calculate the phase…
A mathematical model of an electrochemical capacitor with hydrous ruthenium oxide electrodes including both double‐layer and surface faradaic processes is developed to predict the behavior of the capacitor under conditions of galvanostatic charge and discharge. The effect of particle size is studied and shows that the…
We present an experimental study of the premartensitic and martensitic phase transitions in a ${\mathrm{Ni}}_{2}\mathrm{MnGa}$ single crystal by using ultrasonic techniques. The effect of applied magnetic field and uniaxial compressive stress has been investigated. It has been found that they substantially modify the…
Newly synthesized sexithiophenes, di- and tetramethylated at the β-positions, are shown to be soluble and processable compounds, giving single crystals suitable for X-ray structure determination. The molecular packing was characterized in terms of crystal cohesion and short C H··· S and C H···π intermolecular distance…
With the rise of Bayesian methods in crystallography, the error estimates attached to estimated phases are becoming as important as the phase estimates themselves. Phase improvement by density modification can cause problems in this environment because the quality of the resulting phases is usually overestimated. This…
A fluid DGEBA/methyl nadicanhydride epoxy system has been filled with inorganic particles, cast as bubble-free plates and cured. The ability of both the pure network polymer and the polymer/particle composites to withstand partial electrical discharges has been investigated. Three types of particle combinations were u…
The phosphoenolpyruvate (PEP)-dependent phosphotransferase system (PTS) phosphorylates sugars and regulates cellular metabolic processes using a phosphoryl transfer chain including the general energy coupling proteins, Enzyme I (EI) and HPr as well as the sugar-specific Enzyme II complexes. Analysis of the Escherichia…
The GaAs(100) surfaces chemically treated in HCl-isopropanol solution and annealed in vacuum were studied by means of Auger electron spectroscopy, x-ray photoelectron spectroscopy, high-resolution electron energy-loss spectra, and Low-energy electron diffraction (LEED). Chemical treatment and sample transfer into ultr…
The high strength to weight ratio of magnesium alloys makes them extremely attractive for applications in transport or aerospace technology. However, their corrosion behavior is a major issue and one reason why they are still not as popular as aluminum alloys. This papers reviews the corrosion mechanisms of magnesium…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXT[48]Dodecaphyrin-(1.0.1.0.1.0.1.0.1.0.1.0) and [64]Hexadecaphyrin-(1.0.1.0.1.0.1.0.1.0.1.0.1.0.1.0): The Largest CyclopolypyrrolesJun-ichiro Setsune, Yasuyuki Katakami, and Noriko IizunaView Author Information Department of Chemistry, Faculty of Science, and Graduate S…
Using an iterative sequence of Wittig olefination, reduction, oxidation, and condensation of an active methylene group to carbonyl, it was possible to prepare a series of organometallic push−pull molecules [(CO) 5 M C(OCH 3 )(−CH CH−) n (C 5 H 4 )Fe(C 5 H 5 ), M = W, Cr, n = 1−4] in which ferrocene is the donor elemen…