Materials Literature
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Abstract The name volkonskoite was first used in 1830 to describe a bright blue-green, chromiumbearing clay material from the Okhansk region, west of the Ural Mountains, U.S.S.R. Since that time, the name has been applied to numerous members of the smectite group of clay minerals, although the reported chromium conten…
The anodization of aluminum covered with a thin crystalline thermal oxide layer in a solution of ammoniumpentaborate in water requires less charge than the anodization of a specimen not covered with thermal oxide to the same voltage. This behavior is connected with the formation during anodization of crystalline oxide…
Low-temperature X-ray diffraction measurements performed on tetra-tert-butyltetrahedrane revealed the existence of clathrates in crystals without hydrogen bonds. Both N2 and Ar are entrapped. The deformation density determined for the Ar clathrate revealed that the tetrahedral bonds are bent outward from the CC bond…
Water treeing is one of the main causes of premature breakdown of the polymeric insulation of HV power cables. The work reported in this paper is the combined effort of three different laboratories to investigate water treeing behavior of several polymers by complementary techniques. These include determination of wat…
Icosahedral quasiperiodic crystals of the Al85Si1Mn14system have been prepared by rapid quenching from the melt. Thermal analysis measurements, electrical resistivity and neutron thermodiffractometry have shown that the alloy transforms into conventional crystals in a two-step mechanism producing first the 0-Al6Mn pha…
A graphic multiple peak resolution method by wide angle X-ray scattering (WAXS) pattern was described and used to estimate the interplanar spacings, crystallinities, and crystalline sizes of eight poly(ethylene terephthalate) (PET) fibers. The values for interplanar spacings of Dacron 54 suggested that the unit cell m…
To determine if pretreatment of polytetrafluoroethylene (PTFE) vascular grafts with fibronectin (FN) increased platelet adherence to them and adversely affected their patency, we labeled autologous canine platelets with indium III-oxine and interposed a FN-coated, experimental, 4 mm inner diameter, 10 cm long PTFE pro…
The laser and phosphor host material with nominal composition LaMgAl11O19 is shown to be nonstoichiometric. Czochralski grown crystals are hexagonal, with space group P63/mmc, and a=5.589 82(5), c=21.9738(12) Å at 295 K. The thermal expansivity has been determined over the range 295 to 860 K: at 295 K, α1=4.97(2)×10−6…
A technique is presented for characterizing the surface wettability of relatively long filaments based on scanning the filament with a liquid membrane. This technique overcomes the limitations of specimen size and crimp, which are inherent in the bulk immersion method for evaluating wettability changes along a filamen…
Fission product release tests and control tests recently conducted at Oak Ridge National Laboratory have provided new experimental data that help characterize the mechanism of fission product tellurium release behavior under severe light water reactor accident conditions. Release of tellurium from the fuel rod segment…
Abstract We present a theoretical treatment of nematic‐isotropic phase equilibria in mixtures which consist of random coils and comblike polymers, the latter components being composed of a rigid backbone and flexible side chains. The mixing partition function is evaluated by using the Flory lattice model. The comblike…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe structure and barrier to inversion of tetrasilabicyclo[1.1.0]butane. Comparison to bicyclo[1.1.0]butaneScott Collins, Remo Dutler, and Arvi RaukCite this: J. Am. Chem. Soc. 1987, 109, 9, 2564–2569Publication Date (Print):April 1, 1987Publication History Published online1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnimolecular decomposition of oxalic acidTerumitsu. Kakumoto, Ko. Saito, and Akira. ImamuraCite this: J. Phys. Chem. 1987, 91, 9, 2366–2371Publication Date (Print):April 1, 1987Publication History Published online1 May 2002Published inissue 1 April 1987https://pubs.acs.org/d…
Abstract The crystal and molecular structures of the title complexes were determined by the single-crystal X-ray diffraction method. Both of them are triclinic, with the space group P\bar1. The crystallographic data: 2-methylpyridine (α-pic) adduct, a=11.076(3), b=18.478(8), c=9.299(3)Å, α=104.60(3), β=114.84(2), γ=81…
Abstract Through replacement of cations with neutral molecules of similar shape and polarizability in a highly conducting “metal‐like” change‐transfer organic conductor, the deliberate control of the electronic structure from a quarter to a half‐filled band is possible. This goal has been achieved with the N ‐methylph…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotolysis of acylpolysilanes containing .alpha.-hydrogens. Formation of linear head-to-head silene dimersKim M. Baines and A. G. BrookCite this: Organometallics 1987, 6, 4, 692–696Publication Date (Print):April 1, 1987Publication History Published online1 May 2002Published…
Monolithic alumina ceramics and alumina matrix ceramic composites show considerable promise as structural materials in a number of energy conversion and utilization applications. The ability to join these materials to themselves and to metals is vital to the successful use of these ceramics in advanced devices. Metall…
The varistor properties were examined in porous ZnO. The sample used contained no dopants such as Bi 2 O 3 or Pr 6 O 11 , which are usually considered to be useful in developing varistors. Comparison of I‐V curves for the oxidized and unoxidized samples indicated that oxygen, which had chemisorbed and diffused into th…
We study the influence of nonlinear effects on the electrohydrodynamics of uniaxial nematic liquid crystals. To measure a novel reversible nonlinear coupling between an electric field, distortions of the director, and the stress tensor, we suggest an experimental setup and predict the occurrence of a flow in an initia…
The preparation of sodium phosphate oxynitride (Na‐P‐O‐N) glasses was investigated in dry ammonia, forming gas and 90% N 2 + 10% CO atmospheres. Significant nitrogen dissolution, up to 13 wt% in a NaPO 3 melt, occurred only in ammonia. The kinetics of nitrogen dissolution was studied as a function of remelting time (1…