Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGas permeation and selectivity of poly(organophosphazene) membranesHarry R. Allcock, Constance J. Nelson, William D. Coggio, Ian Manners, William J. Koros, David R. B. Walker, and Luiz A. PessanCite this: Macromolecules 1993, 26, 7, 1493–1502Publication Date (Print):March 1,…
Dense ceramics of Pb(Fe 1/2 Nb 1/2 )O 3 with high resistivity were fabricated below 1000°C by making use of the hot-pressing technique. For these hot-pressed specimens, measurements of the spontaneous polarization, dielectric constants, electromechanical coupling factors, piezoelectric constants and elastic compliance…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Yalda Farhoudi, Alejandro D. Rey; Shear flows of nematic polymers. I. Orienting modes, bifurcatio…
The central gallium(III) ion propagates the pairwise ferromagnetic exchange interactions between the S = 1/2 ligands in the title complex 1, which lead to an S = 3/2 ground state, as magnetic susceptibility measurements of 1 have shown. These types of complexes are important for the design of molecular ferromagnets. 3…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpecific molecular recognition via multipoint hydrogen bonding ubiquinone analogs - porphyrin having four convergent hydroxyl groups pairingTakashi Hayashi, Takashi Miyahara, Naomichi Hashizume, and Hisanobu OgoshiCite this: J. Am. Chem. Soc. 1993, 115, 5, 2049–2051Publicati…
Applying the method of optically detected magnetic resonance (ODMR) via the magnetic circular dichroism (MCD) of absorption, paramagnetic resonance data are provided for the ground state of the intrinsic defect ${\mathrm{Bi}}_{\mathit{M}}$ in sillenites of the type ${\mathrm{Bi}}_{12}$M${\mathrm{O}}_{20}$ (M=Si, Ge, T…
Abstract The relative analyser transmission functions of two different XPS spectrometers (VG ESCA‐3 Mk II and SSI X‐Probe of Fisons) have been determined experimentally by several methods presented in the literature. The transmission function of the VG ESCA‐3 Mk II can be expressed as T ∝ E a ( E a / E k ) n , where n…
The conductivity and tensile strength of stretch-oriented, doped, crosslinked films of polyaniline are found to be considerably greater than those prepared from non-crosslinked films of the polymer. The conductivity of the former films show little dependence on molecular weight or degree of crosslinking whereas their…
Reaction mechanisms in the formation of PZT solid solution were studied under hydrothermal conditions (Pb/(Zr+Ti) = 1.0 to 1.9, Zr/Ti = 0/10 to 10/0, 1 M to 5 M KOH, 100° to 220°C, 2 h). A yellow tabular crystallite with tetragonal symmetry and Pb/Ti ∼ 2 was formed at 100° to 130°C. A PZT crystallite was formed just a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemisorption of nitric oxide on char. 2. Irreversible carbon oxide formationHsisheng Teng and Eric M. SuubergCite this: Ind. Eng. Chem. Res. 1993, 32, 3, 416–423Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissue 1 March 199…
A novel polyborosilazane was synthesized by reacting per‐hydropolysilazane with trimethyl borate. The chemical structure of this polymer was investigated by the techniques of infrared spectroscopy and nuclear magnetic resonance measurements. Amorphous silicon nitride was obtained by pyrolysis of this polymer in a stre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of the melting and crystallization behavior of binary poly(.epsilon.-caprolactone)/poly(hydroxy ether of bisphenol A) blendsR. De Juana and M. CortazarCite this: Macromolecules 1993, 26, 5, 1170–1176Publication Date (Print):March 1, 1993Publication History Published on…
Molecular-dynamics calculations are carried out on quartz, ${\mathrm{AlPO}}_{4}$, and ${\mathrm{LiKSO}}_{4}$, which are composed of corner-linked tetrahedra and are known to display crystalline-to-amorphous transitions at 15, 12, and 13 GPa, respectively, at 300 K. The transition occurs when the ${\mathit{T}}_{1}$O${\…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new photoreceptor molecule from Stentor coeruleusNengbing Tao, Mario Orlando, Jae Seok Hyon, Michael Gross, and Pill Soon SongCite this: J. Am. Chem. Soc. 1993, 115, 6, 2526–2528Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published i…
A distinction has been made experimentally between the effect on conductivity and tensile strength caused by 1-D mechanical alignment of parent polyaniline films and the effect produced by the combination of physical crosslinking by crystalline domains and associated 1-D nematic-type alignment of amorphous material. A…
Using a lactose permease mutant devoid of Cys residues (C-less permease), Asp237 and Lys358 were replaced with Cys or other amino acids to pursue the proposal that the two residues form a charge pair [King, S. C., Hansen, C. L., & Wilson, T.H. (1991) Biochim. Biophys. Acta 1062, 177-186]. Individual replacement of Asp…
We apply the rigorous electromagnetic grating theory and an electromagnetic wave-propagation model with Kirchhoff boundary conditions to analyze and optimize the performance of arrays of cylindrical dielectric multilevel diffractive lenses. We show that the diffraction efficiency of a high-numerical-aperture lens arra…
To investigate the safety, patient tolerance, and efficacy with 0.3 mmol/kg gadopentetate dimeglumine in magnetic resonance (MR) imaging of the central nervous system (CNS), a phase 3 trial was conducted in 199 patients with suspected CNS lesions. Patients received either 0.1 or 0.3 mmol/kg gadopentate dimeglumine (in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe first ferromagnetic tetranuclear nickel(II) complex with a .mu.-azido bridge. Structure and magnetic properties of [Ni4(.mu.-N3)4(2-oxo-1,3-diaminopropane)2(2-hydroxo-1,3-diaminopropane)2](ClO4)2Joan Ribas, Montserrat Monfort, Ramon Costa, and Xavier SolansCite this: Ino…
Nitrogen-rich films of carbon nitride were prepared for the first time on silicon wafers and tungsten carbide plates by means of the ion-assisted dynamic mixing (or ion and vapor deposition, IVD) method. The thickness of the films was 1.0 µm and the composition ratio, C/N, was changed from 0.2 to 2.0. The energy of ni…