Materials Literature
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Structures of tripotassium tetrasodium dihydrogen decatungstolanthanoate crystals, K 3 Na 4 H 2 [LnW 10 O 36 ].nH 2 O (Ln=Pr, Nd, Dy; n=21-22), have been determined and compared with the structures of their isomorphous crystals with Ln=Sm, Gd and Tb. All six [LnW 10 O 36 ] 9- anions in these isomorphous crystals exhib…
Abstract The title complexes in the compositions 2Ag(CN)·Cd(CN)2·3(4-Mepy) and 3Ag(CN)·Cd(CN)2·4(4-Mepy) crystallize from the same mother solution with the supramolecular structures remarkably different from each other. The former is a clathrate accommodating a guest 4-Mepy in the interwoven double network host. The l…
Stability of hollow fiber drawing is studied, based on the quasi-one-dimensional equations of thin film dynamics. It is shown that the model isothermal drawing process is unstable when the draw ratio E (that of output to input velocities) exceeds the critical value E*=20.22 when the viscosity force is dominating. Unde…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural Studies of Thermoplastic Triblock Copolymer GelsN. Mischenko, K. Reynders, K. Mortensen, R. Scherrenberg, F. Fontaine, R. Graulus, and H. ReynaersCite this: Macromolecules 1994, 27, 8, 2345–2347Publication Date (Print):April 1, 1994Publication History Published on…
To better understand the reasons for the hyper-accumulation of polyhydroxyalkanoate (PHA) in mutant Azotobacter vinelandii UWD, the kinetic properties of 3-ketothiolase, acetoacetyl-CoA reductase, and β-hydroxybutyrate dehydrogenase were examined. The regulation of the condensation of acetyl-CoA mediated by 3-ketothio…
Creep and creep rupture behavior of an advanced silicon nitride ceramic were systematically characterized in the temperature range 1150° to 1300°C using uniaxial tensile creep tests. Absence of tertiary creep and the order‐of‐magnitude breaks in both creep rate and rupture lifetime at certain threshold combinations of…
Abstract UV spectrophotometry of a Hammett indicator revealed that the acid strength of the Keggin-type heteropolyacids having W as addenda atoms increased as the valency of the central atom increased (Co < B < Si, Ge < P). The catalytic activity for the decomposition of isobutyl propionate in a h…
We determine the phase diagram of a quasi-one-dimensional superconductor (weakly coupled chains system with an open Fermi surface) in a magentic field. A field H(0,H,0) along the y direction (perpendicular the direction x of highest conductivity) tends to confine the electronic motion in the z direction. At low temper…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReexamination of Shock-Tube Measurements of the Rate Coefficient of H + O2 .fwdarw. OH + OC.-L. Yu, M. Frenklach, D. A. Masten, R. K. Hanson, and C. T. BowmanCite this: J. Phys. Chem. 1994, 98, 17, 4770–4771Publication Date (Print):April 1, 1994Publication History Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLayer Structures. 2. Influence of Spacers on Chain Packing and Phase Transitions of Poly(ester-imide)s Derived from N-(4-Carboxyphenyl)trimellitimideHans R. Kricheldorf, Gert Schwarz, Matthias Berghahn, Javier de Abajo, and Jose de la CampaCite this: Macromolecules 1994, 27,…
A new and unique processing method for fabricating stress-biased, monolithic ceramic elements for ultra-high displacement actuators is reported. The technique consists of chemically reducing one surface of a high lead containing piezoelectric or electrostrictive wafer such as PLZT with solid graphite in an oxidizing a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeuteration Effects and Solubility Parameter Ordering in Blends of Saturated Hydrocarbon PolymersWilliam W. Graessley, Ramanan Krishnamoorti, Nitash P. Balsara, Lewis J. Fetters, David J. Lohse, Donald N. Schulz, and Joseph A. SissanoCite this: Macromolecules 1994, 27, 9, 25…
We have studied the structural characteristics of the smectic phases formed by the main-chain type of polymers in which the mesogenic biphenyl moieties are linked by two different odd-numbered aliphatic spacers in a regularly alternate fashion. The first interesting result of this study is that the two different types…
Abstract Hydrotalcite (HT) interlayered with hexacyanoferrate(II) ions ([Mg 4.62 Al 1.52 (OH) 12 ][(Fe(CN) 6 ) 0 . 30 -(CO 3 ) 0.29 ]) has been synthesized from the carbonate-HT ([Mg 4.52 Al 1.50 (OH) 12 ][(CO 3 ) 0.77 ]) through double ion exchange reactions, and the products have been studied by chemical and physica…
From X-ray diffractometer single-crystal data, the structures of two binary n-alkane phases have been determined. (1) β-C 24 H 50 , C 26 H 54 , β-tetracosane-hexacosane, mole fraction of C 24 H 50 0.77, hence effective molecular weight 345. 39, space group Bb2 1 m (No. 36), a=4.992 (1), b=7.503 (3), c=67.448 (8) A, Z=…
Abstract The intercalation of poly(ethylene oxide), PEO, into homoionic phyllosilicates of the smectite group (montmorillonite and hectorite) gives composite materials able to act as solid polyelectrolytes. The synthesis and the structural characterization of new intercalation compounds belonging to this class of mate…
Site-directed mutagenesis was carried out to map the residues that form the two Zn(II) sites within a LIM domain. The C-terminal LIM domain derived from the cysteine-rich protein was utilized for this analysis and is referred to as LIM2. Seven cysteinyl residues and a single histidyl residue in the LIM2 sequence, CX2C…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordination Geometries of Solvated Lanthanide(II) Ions: Molecular Structures of the Cationic Species [(DIME)3Ln]2+ (DIME = Diethylene Glycol Dimethyl Ether; Ln2+ = Sm, Yb), [(DIME)2Yb(CH3CN)2]2+, [(DIME)Yb(CH3CN)5]2+, and [C5H5N)5-Yb(CH3CN)2]2+James P. White III, Haibin Den…
The transparency of a film/substrate interface for thermal phonons was investigated for ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7}$ thin films deposited on MgO, ${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$, ${\mathrm{LaAlO}}_{3}$, ${\mathrm{NdGaO}}_{3}$, and ${\mathrm{ZrO}}_{2}$ substrates. Both voltage respons…
Abstract— A new optical device whose reflection intensity can be electrically controlled at specific wavelengths has been demonstrated. This device has a liquid‐crystal/polymer multilayer structure formed by holography. The diffraction efficiency for Ar‐laser light is about 70%. The reflection intensity can be electri…