Materials Literature
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This work presents a new method of synthesizing the reflection profile, based on the calculation of Fourier coefficients of instrumental functions. The classification and construction of Fourier coefficients are effected, in a general way, from the analysis of the possible paths of beams in the diffractometer. Relatio…
The fluctuation-dissipation theory of free volume in condensed media is discussed. The free volume concept developed is applicable in the theory of viscoelastic properties and thermal expansion of polymers.
CuV 2 O 6 and Cu 2 V 2 O 7 are low-mobility n-type semiconductors; at room temperature [Formula: see text]. From photoelectron-chemical measurements optical interband transitions are found at 2.02 and 3.15 eV for indium-doped CuV 2 O 6 , and at 1.87 and 2.88 eV for Cu 2 V 2 O 7 . In both materials the valence band edg…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA comparative study of zinc oxide overlayers on copper (311), Cu(110), and a high defect concentration Cu(111)Sabrina S. Fu and Gabor A. SomorjaiCite this: Langmuir 1992, 8, 2, 518–524Publication Date (Print):February 1, 1992Publication History Published online1 May 2002Publ…
A new and improved method for the treatment of dislocations in continuum numerical models, in the mesoscale range of lengths 1–1000 nm, is introduced. The dislocation representation, based on splined parametric polynomials, is described. The necessary numerical procedures are presented and justified in detail. Applica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRadius of gyration and viscosity of linear and star polymers in different regimesAntonio Rey, Juan J. Freire, Marvin Bishop, and Julian H. R. ClarkeCite this: Macromolecules 1992, 25, 4, 1311–1315Publication Date (Print):February 1, 1992Publication History Published online1…
Abstract The spin-lattice relaxation time, T 1 , of the 23 Na-NMR line in NaNO 2 is measured between 25 K and 160 K at two magnetic field strengths, 1.1 T and 6.9 T. The temperature dependence of T 1 for the center line, observed on a polycrystalline sample prepared by precipitation from aqueous solution, is given by…
For atomic systems, the boundaries in position and momentum space that enclose the exact electron number given by the aufbau principle have been numerically calculated. Their relatively irregular behavior as a function of the atomic number Z is demonstrated and explained in terms of corresponding irregularities of the…
The peculiarities of evolution of domain structure in uniaxial ferroelectric lead germanate during switching under the train pulses of strong field are investigated. The contribution of different mechanisms in switching process are discussed.
An antireflective coating on Ge which combines a polycrystalline diamond film with a surface relief (moth eye) structure has been designed and successfully fabricated. This progressive gradation in the effective refractive index between air and the substrate has reduced Fresnel reflection losses to below 1%. This prov…
Abstract The dissolution of two Ca 2+ -exchanged nontronite samples has been studied in 10% HCl. Early acid-dissolution studies (Osthaus, 1954) have indicated that after two hours of dissolution most of the octahedral Fe 3+ ( VI Fe 3+ ) would be removed leaving mainly tetrahedral Fe 3+ ( IV Fe 3+ ) in the nontronite s…
Abstract Hydroxy-interlayered vermiculite (HIV) is a ubiquitous phyllosilicate in the <0.05-mm fraction of sandy soils on the U.S. southeastern coastal plain. Extensive areas of soils with abundant HIV (i.e., peninsular Florida) have no detectable mica; yet the coarseness, platy habit, and nonexchangeable K associa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon-13 NMR investigation of a poly(urethane-urea) systemDavid T. Okamoto, Stuart L. Cooper, and Thatcher W. RootCite this: Macromolecules 1992, 25, 3, 1068–1073Publication Date (Print):February 1, 1992Publication History Published online1 May 2002Published inissue 1 Febru…
The microstructures and magnetic properties of Fe-(Ta, Nb, Zr)-N alloy films near the eutectic composition were studied. These new soft magnetic alloy films were prepared by N2reactive sputtering. The structures and magnetic properties were changed by annealing or by adjusting the ratio of the N2partial pressure to th…
The room‐temperature mechanical properties of a SiC‐fiberreinforced reaction‐bonded silicon nitride composite were measured after 100 h treatment in nitrogen and oxygen environments to 1400°C. The composite heat‐treated in nitrogen to 1400°C showed no appreciable loss in properties. In contrast, composites heat‐treate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of unsaturated dihydrido carbonyl complexes of manganese(I) with nitriles and isonitriles. Preparation and characterization of the first binuclear .mu.,.eta.1,.eta.2-NCR derivativesFrancisco J. Garcia Alonso, Manuel Garcia Sanz, Victor Riera, Adela Anillo Abril, An…
Abstract In a search for new types of polymer architecture, we have examined systems where one couples rigid‐rod monomers with multifunctional tie‐point monomers. High surface area (400–1000 m 2 /g) polymeric carbinols result from reaction of 4,4′‐dilithiobiphenyl, as well as other multi‐lithiated aromatic compounds w…
<div class="htmlview paragraph">This paper describes the findings of a laboratory effort to demonstrate improved automotive exhaust emission control with a cold-start hydrocarbon collection system. The emission control strategy developed in this study incorporated a zeolite molecular sieve in the exhaust system…
We have measured the density of liquid sulfur as a function of temperature near the polymerization temperature. We measure between 424 and 445 K, with a precision in density of 2×10−5 and an accuracy of 5×10−4. We see upward shifts of the density within 3 K of the polymerization temperature of about 8×10−4 with each c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and physical properties of poly(aryl ether phthalazine)sRina Singh and Allan S. HayCite this: Macromolecules 1992, 25, 3, 1025–1032Publication Date (Print):February 1, 1992Publication History Published online1 May 2002Published inissue 1 February 1992https://pubs.a…