Materials Literature
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The crystallization of polyamide 6.12 was investigated by X-ray diffraction and infrared spectroscopy. Similar to polyamide 6.6, there exist a pseudohexagonal γ modification and a triclinic α modification. The characteristic IR absorption bands of each modification were identified and assigned. In the amorphous state,…
We present sample numerical solutions of the equation of motion that governs the dynamics of molecular orientation in ferroelectric liquid crystal cells with chevron layer structure. We show that the chevron structure significantly influences the director field, the chevron interface providing surface stabilization on…
Residual stresses in a SiC‐TiB 2 particulate composite before and after stressing have been measured using X‐ray diffraction. Tensile residual stresses in the TiB 2 drop by 60% after bending stresses of 250 MPa are applied. Likewise, the compressive residual stresses in the Sic phase decrease accordingly. Such behavio…
X-ray photoelectron spectroscopy has been used to monitor the surface chemical changes on DuPont high-modulus pitch-based carbon fiber surfaces brought about by microwave air-plasma treatments for different periods of time. The air-plasma treatment increased the fiber surface functionalities, but extended treatment ca…
Abstract Ferromagnetic spin-coupling between Cu(II) and Gd(III) ions was observed in a binuclear Cu(II)–Gd(III) complex CuGd(fsaen)NO3·4H2O (H4fsaen = N,N′-bis(3-carboxysalicylidene)ethylenediamine). The magnetic behavior was well reproduced by the equation derived from H = −2JSCu·SGd (SCu = 1/2, SGd = 7/2) with g = 2…
Mixed mass‐transport and kinetic control of sodium ion reduction at porous, inert electrodes on sodium beta′ alumina solid electrolyte (BASE) ceramic in a high‐temperature electrochemical cell has been observed and modeled.The high ionic conductivity of BASE and the reversibility of the liquid sodium/BASE anodic half‐…
The properties of polypyrrole (PPy) films synthesized at very low current densities (1–250 μA/cm 2 ) were investigated. Potentiodynamic cycling, in situ FTIR spectroscopy, and in situ differential electrochemical mass spectroscopy were employed. The use of propylene carbonate (PC) based electrolytes for the synthesis…
The thermal behavior of hyperquenched glassy D2O was investigated by differential scanning calorimetry from 103 to 250 K, in order to investigate the isotope effect on the glass→liquid transition and on the liquid to cubic, and cubic to hexagonal ice. For a heating rate of 30 K min−1 the temperatures of the thermal ef…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA general fluorescence assay for enzyme catalyzed polyanion hydrolysis based on template directed excimer formation. Application to heparin and polyglutamateScott A. Van Arman and Anthony W. CzarnikCite this: J. Am. Chem. Soc. 1990, 112, 13, 5376–5377Publication Date (Print)…
Atomic structures of perfect (90° and 60°) and partial (90°) dislocations including total and core energies have been calculated using four different interatomic potentials in silicon, germanium and diamond. The core energies of dislocations do not scale with the magnitudes of Burgers vectors associated with them. How…
Abstract Effects of the variation of adhesion strength σ A on the tensile yield behavior of particulate filled polypropylene (PP) were investigated. To enhance adhesion of PP toward calcium carbonate (CaCO 3 ) and magnesium hydroxide (Mg(OH) 2 ), maleated PP (MPP) was added to PP in various ratios. σ A varied from 10‐…
The thermal and light-induced high-spin (HS: 5T2g) low-spin (LS: 1A1g) transitions of [Fe(ptz)6](BF4)2 (ptz = 1-propyltetrazole) are investigated by X-ray powder diffractometry in the range between ambient temperature and ~15 K. The anisotropic lattice deformation caused by variation of the HS fraction and by temperat…
"Structural Applications of Mechanical Alloying." Materials and Processing Report, 5(3), pp. 5–6
The peptidylglycine alpha-amidating enzyme catalyzes a reaction that transforms a carboxyl-terminal glycine-extended precursor into a carboxyl-terminal alpha-amidated peptide. We purified an alpha-amidating enzyme from equine serum by simplified steps including substrate affinity chromatography. With the purified enzy…
A study has been made of the influence of transesterification on the miscibility in binary blends of poly(ethylene terephthalate) and poly(bisphenol-A carbonate). The blends were melt mixed in the range 260–300°C and studied by differential scanning calorimetry, dynamic mechanic analysis, and by Fourier transform infr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA family of mononuclear manganese(IV) complexes: an MnIVO4N2 sphere assembled via phenolate-imine-carboxylate coordinationSwapan Kumar Chandra, Partha Basu, Debashis Ray, Samudranil Pal, and Animesh ChakravortyCite this: Inorg. Chem. 1990, 29, 13, 2423–2428Publication Date (…
Abstract In the presence of metallic bismuth, bismuth(III) chloride–metallic zinc, or bismuth(III) chloride–metallic iron, allylic halides have been found to react with aldehydes under mild conditions to give the corresponding homoallylic alcohols in high yields with high chemo-, regio-, and stereoselectivity. Allylic…
A realistic model structure of the ferrielectric phase is proposed by taking into account the apparent tilt angle measurements. On the basis of the model, the electric and optical responses are investigated in the ferrielectric SmC γ * as well as in the antiferroelectric SmC A * phases of MHPOBC (C 8 H 17 O- - -COO- -…
Volatile chalcogenolato complexes of cadmium with stertically demanding thio- and selenophenolato ligands can easily be prepared. In the solid state, the complexes 1 are dimeric with trigonal-planar coordinated cadmium, whereas in solution they dissociate to monomers. They sublime at high temperatures and can be used…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeometry dependence of intramolecular photoinduced electron transfer in synthetic zinc-ferric hybrid diporphyrinsAtsuhiro Osuka, Kazuhiro Maruyama, Noboru Mataga, Tsuyoshi Asahi, Iwao Yamazaki, and Naoto TamaiCite this: J. Am. Chem. Soc. 1990, 112, 12, 4958–4959Publication D…