Materials Literature
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The symmetry-predicted nonzero components of the piezoelectric coefficient, dielectric constant, and elastic compliance matrices have been determined on poly(vinylidene fluoride/trifluoroethylene)(75/25) copolymer at room temperature and a frequency of 500 Hz. The temperature dependence of each of the complex piezoele…
In many cases, evidently inert and nontoxic biomaterials may trigger procoagulant and inflammatory responses. Because most polymeric biomaterials accumulate a surface layer of protein immediately after implantation, these adverse reactions may stem from secondary interactions between the host and this surface layer of…
<p>The ligand 2,6-bis(l-methylbenzimidazol-2-yl)pyridine (mbzimpy, 1) reacts with lanthanide perchlorate in acetonitrile to give the successive complexes [Ln(mbzimpy)„]<sup>3+</sup> (n = 1-3). Tris complexes were isolated for La, Eu, Gd, and Tb, while a bis complex only could be crystallized for Lu.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrophase separation of ABC-type triblock copolymersHatsumi Nakazawa and Takao OhtaCite this: Macromolecules 1993, 26, 20, 5503–5511Publication Date (Print):September 1, 1993Publication History Published online1 May 2002Published inissue 1 September 1993https://pubs.acs.org…
Scanning electrochemical microscopy, SECM, of oxide‐covered titanium foils (∼50 Å oxide thickness) immersed in potassium bromide solutions is reported. Electrogeneration of bromine at the film is shown to occur rapidly at a few microscopic surface sites. The regions of intense faradaic activity observed in SECM images…
An atomistic simulation technique has been used to predict the spatial arrangement of the dopant species sodium, lithium, and chlorine within the zinc oxide lattice. The alkaline oxides are preferentially incorporated via a self‐compensating mode, forming interstitial cations which hinder the migration of zinc interst…
We have studied the static magnetic properties of three different M-type doped barium ferrite compounds prepared by the glass crystallization method. The zero-field-cooled (ZFC) and field-cooled (FC) processes have been recorded at low field and they all show the typical features of a small particle system. The ZFC cu…
The surfaces of AlN powders, which are particularly sensitive to moisture and atmospheric oxygen, are characterized by x-ray photoelectron spectroscopy (XPS). The powders used were exposed to ambient air and then heat treated at 100 °C in air, argon, or nitrogen gas. Bremsstrahlung-excited Auger electron spectroscopy…
Glassy and melt atactic polypropylene microstructures obtained via energy minimization and Monte Carlo simulation are subjected to geometric analysis (Delaunay tessellation followed by volume and connectivity analysis) in order to determine the clusters of sites where a hard sphere penetrant of radius 0–2.5 Å can resi…
In a two-chamber ultrahigh vacuum system, epitaxial TiO2 thin films have been deposited by metalorganic chemical vapor deposition on single crystal oxide substrates over a temperature range of 250–800 °C, using titanium (IV) isopropoxide as the precursor. During the initial stage of epitaxial film deposition, the grow…
Target-specific superparamagnetic contrast agents may allow the localization of specific tissues such as tumors by magnetic resonance imaging (MRI). In this report the preparation and in vitro characterization of tumor-specific superparamagnetic particles (SMP) are described. Particles of uniform size (9.6 +/- 0.8 nm)…
SUMMARY The ability of the roots of rape ( Brassica napus ) to promote the transformation and dissolution of a phlogopite mica was studied in the rhizosphere. Rape was cropped for 1 to 32 d on 2–105 μm phlogopite as sole source of both K and Mg. The chemical balance of K and Mg revealed that rape was able to induce a…
Cellulose-binding protein A (CbpA), a component of the cellulase complex of Clostridium cellulovorans, contains a unique sequence which has been demonstrated to be a cellulose-binding domain (CBD). The DNA coding for this putative CBD was subcloned into pET-8c, an Escherichia coli expression vector. The protein produc…
The influence of various rubbing parameters on the molecular reorientation of thin polyimide orienting layers, used to align liquid-crystal (LC) molecules within liquid-crystal displays, has been studied. For this purpose the optical phase retardation in the polymer layer, explicitly induced during the rubbing treatme…
Conducting‐polymer‐based poducts that are commercially available are the topic of this second part of a two‐part article (the first half appeared last month). Many people are not aware that conducting polymers have reached the marketplace in the form of “coin”‐shaped batteries (see Figure). 3.5.″ floppy disks, and ele…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDodecatitanates: a new family of stable polyoxotitanatesV. W. Day, T. A. Eberspacher, W. G. Klemperer, and C. W. ParkCite this: J. Am. Chem. Soc. 1993, 115, 18, 8469–8470Publication Date (Print):September 1, 1993Publication History Published online1 May 2002Published inissue…
Abstract The mechanisms which, in isotactic polypropylene, create α phase nuclei on partial melting of β phase spherulites are investigated by thermal analysis and optical and electron microscopy. Nuclei concentrations are determined from recrystallization characteristics. α phase nuclei are formed within β spherulite…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantum size effects in nanocrystalline semiconducting titania layers prepared by anodic oxidative hydrolysis of titanium trichlorideLadislav Kavan, Tiziana Stoto, Michael Graetzel, Donald Fitzmaurice, and Valery ShkloverCite this: J. Phys. Chem. 1993, 97, 37, 9493–9498Publi…
Random tilings that comprise squares and equilateral triangles can model quasicrystals with twelvefold symmetry. A (phason) elastic theory for such tilings is constructed, whose order parameter is the phason field, and whose entropy density includes terms up to third order in the phason strain. Due to an unusual const…
Low-frequency Raman spectra of some glasses have been measured at low temperature. Comparison of the spectra with heat-capacity data shows that in a broad frequency range the Raman intensity is simply proportional to the number of vibrational excitations [density of the vibrational states g(\ensuremath{\nu}) multiplie…