Materials Literature
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The polymerase chain reaction (PCR) has been used to amplify the portion of the Spidroin 1 gene that codes for the C-terminal part of the silk protein of the spider Nephila clavipes. Along with some substitution mutations of minor consequence, the PCR-derived sequence reveals an additional base missing from the previo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural analysis of polymer-protected platinum/rhodium bimetallic clusters using extended x-ray absorption fine structure spectroscopy. Importance of microclusters for the formation of bimetallic clustersMasafumi Harada, Kiyotaka Asakura, and Naoki ToshimaCite this: J. Ph…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTESR Study of Cobalt(II) Tetrakis(N-methyl-4-pyridiniumyl)porphyrin and Cobalt(II) Tetrasulfophthalocyanine Intercalated in Layered Aluminosilicates and a Layered Double HydroxideL. Ukrainczyk, M. Chibwe, T. J. Pinnavaia, and S. A. BoydCite this: J. Phys. Chem. 1994, 98, 10,…
A simple model is proposed to describe the electrooptic response of polymer dispersed liquid crystals. A hierarchy of order parameters is introduced to describe orientational order on different length scales. External fields reorient the liquid crystal in the inclusions, and thus alter the orientational order. The res…
The authors propose a novel structured magnetic thin film inductor using rotation magnetization only. The thin film inductor has a sandwich structure, which consists of a double-rectangular spiral coil between top and bottom CoZrNb amorphous thin films. The sputtered CoZrNb amorphous magnetic thin films have uniaxial…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSubstituent Effects in Porphyrazines and PhthalocyaninesAbhik Ghosh, Paul G. Gassman, and Jan AlmloefCite this: J. Am. Chem. Soc. 1994, 116, 5, 1932–1940Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Published inissue 1 March 1994https://…
Electron-spin-resonance studies of films of the conducting form of polyaniline (PANI), doped with camphor-sulfonic acid (CSA) and cast from metacresol solutions, show a temperature-independent Pauli susceptibility between 300 and 50 K; in PANI-CSA, there is no Curie contribution to the paramagnetic susceptibility at h…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of a Molybdenum-Containing Silsesquioxane Which Rapidly Catalyzes the Metathesis of OlefinsFrank J. Feher and Tracey L. TajimaCite this: J. Am. Chem. Soc. 1994, 116, 5, 2145–2146Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Pub…
The long term performance of polymers and their composites is an important aspect of their increasing use in engineering applications. Temporal, thermal, and mechanical stresses can all contribute to the deterioration of performance. Here we examine the concepts of the physics of glassy polymers and how they are impor…
Depolarized light-scattering spectra of propylene carbonate were obtained in the frequency range 0.2 GHz--4 THz at temperatures from 350 to 135 K. Analysis of the resulting susceptibility spectra revealed reasonable agreement with the predictions of the idealized mode coupling theory, yielding critical exponents a=0.2…
BACKGROUND: The authors compared the therapeutic effects of doxorubicin in two formulations: free in saline suspension and encapsulated in sterically stabilized liposomes composed of hydrogenated soy phosphatidylcholine/2cholesterol/polyethylene glycol-distearoyl-phosphatidyl-ethanolamine (Doxil, Liposome Technology,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHyperbranched Aromatic Polyesters with Carboxylic Acid Terminal GroupsS. Richard Turner, Frank Walter, Brigette I. Voit, and Thomas H. MoureyCite this: Macromolecules 1994, 27, 6, 1611–1616Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Pu…
The influence of the surface elastic constant ${\mathit{K}}_{13}$ on director fluctuations in nematic liquid crystals is discussed. An explicit expression for the correlation function in the case of the homeotropically aligned cell is presented. It is shown that in this case ${\mathit{K}}_{13}$ changes the anchoring s…
The mechanisms of degradation of rigid Polyurethane foams (PU) filled with Ammonium Phosphate (AP) as inorganic flame retardant, have been studied using thermogravimetric analysis (TGA) and differential thermal analysis (DTA) both in inert (N 2 ) and oxidizing (air) atmospheres. TGA analyses have shown that the filler…
Abstract Several series of multifunctional silicon‐containing epoxide monomers and oligomers have been prepared using rhodium catalyzed hydrosilation reactions. Dialkyl and diarylsilanes can be condensed with vinyl epoxides to give high yields of the desired diepoxides while the hydrosilation of alkyl and aryl silanes…
A reversible phase transition involving jumping of the crystal in the process of heating and cooling is described. If crystals are fixed to the heating area, physical expansion and contraction are observed when heated and cooled respectively. From the crystal structure of Form I and the powder diffraction of Form II i…
Experimental methods are presented for observing local fabric deformation during uniaxial tensile loading of a woven fabric. These experiments include the traditional ravel strip test as well as the use of video taping, encapsulation, and photographing fabrics varying in weave texture, yarn type (ring and rotor spun),…
The influence of Nb‐doping from 1.0 to 8.0 at.% on grain size, ferroelectric phase transition, lattice strain, and electrical properties of BaTiO 3 Cerumics has been studied. A change in the Nb‐doping effect was observed at compositions around 3.5–4.5 at.% Nb. The impedance behavior revealed that specimens of low Nb‐d…
The unusual electrical properties of metallophthalocyanines (M(Pc)S) have made them the centerof much interest recently, in particular as candidates for the fabrication of novel molecularelectronic devices.M(Pc)‐basedrectifiers have been known for 20 years, but now a new non‐Schottky‐type of rectification has been dis…
Abstract Pyrazoles were found as a novel class of blocking groups for isocyanates. Adhesive mixtures of pyrazole blocked isocyanates and amine terminated prepolymers like Jeffamines® (Texaco Chem. Co.) combine excellent reactivities (gelation times within minutes at 100–120°C), good latencies (more than 170 days at 40…