Materials Literature
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Abstract In this study, we report the melting behavior of poly(phenylene sulfide), PPS, which has been cold‐crystallized from the rubbery amorphous state. We find that the crystallization kinetics are faster for cold‐crystallized PPS than for melt‐crystallized material, due to formation during quenching of a short‐ran…
Previous 13CH4/12C2H2 isotopic competition experiments on the mechanism of diamond growth by chemical vapor deposition are reanalyzed in light of recent evidence for a nonlinear dependence of the first-order Raman shift frequency on 13C mole fraction. The new Raman data imply a 13C mole fraction for mixed-isotope diam…
The phase states of a harmonic oscillator are considered and used to define an analytic representation in the unit disk. The Weyl semigroup in the number-angle phase space is studied. More general states called negative binomial states are introduced, and the corresponding analytic representations in the unit disk are…
We report measurements of the de Haas--van Alphen (dHvA) effect in the organic superconductors \ensuremath{\alpha}-(ET${)}_{2}$(${\mathrm{NH}}_{4}$)Hg(SCN${)}_{4}$ and \ensuremath{\kappa}-(ET${)}_{2}$Cu(NCS${)}_{2}$ in fields up to 15 T and temperatures down to 0.45 K. In both compounds, the perfect 1/cos\ensuremath{\…
The lacS gene from the extremely thermoacidophilic archaebacterium Sulfolobus solfataricus encodes an enzyme with beta-galactosidase activity that, like other enzymes from this organism, is exceptionally thermophilic (optimal activity above 90 degrees C), thermostable, and resistant to common protein denaturants and p…
This paper reports the preliminary results of a study of the anelasticity of a Cu-1.8% Be alloy at strain frequencies between 10−2 and 10−3 Hz. The measurements were made using a vertical dumb-bell pendulum suspended near its centre of mass by a flexure pivot made from the Cu-Be alloy under test. Unexpectedly large an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical properties of gallium arsenide nanocrystalsHiroyuki Uchida, Calvin J. Curtis, Prashant V. Kamat, Kim M. Jones, and Arthur J. NozikCite this: J. Phys. Chem. 1992, 96, 3, 1156–1160Publication Date (Print):February 1, 1992Publication History Published online1 May 2002Pu…
The structure of the fully relaxed phases of a Langmuir monolayer of tetracosanoic acid is determined by x-ray diffraction and reflection along an isotherm at ∼20.5 °C. Isotherms taken by allowing the surface pressure to stabilize between incremental compressions are seen to be qualitatively different from the constan…
Polyethylene glycol has been shown to bind to the molten globule intermediate on the bovine carbonic anhydrase B folding pathway. The mechanism of this interaction has been extensively probed. Polyethylene glycol (PEG) binds weakly to the molten globule first intermediate as measured by hydrophobic interaction chromat…
Pig muscle phosphoglycerate kinase has been crystallized from polyethyleneglycol in the presence of its substrate 3-phospho-D-glycerate (3-PG) and the structure has been determined at 2.0 A resolution. The structure was solved using the known structure of the substrate-free horse muscle enzyme and has been refined to…
Infrared spectroscopy is used to study simultaneously the orientational behaviour of different segments of dye containing liquid-crystalline side group copolymers in sandwich type films of about 2 μm thickness. Under continuous irradiation with polarized light above and below T g of the polymers both azobenzene and ph…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAliphatic hydroxylation catalyzed by iron(III) porphyrinsTeddy G. Traylor, Kenneth W. Hill, Wen Pang Fann, Shinji Tsuchiya, and Beth E. DunlapCite this: J. Am. Chem. Soc. 1992, 114, 4, 1308–1312Publication Date (Print):February 1, 1992Publication History Published online1 Ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIodomethane decomposition on copper(110): surface reactions of C1 fragmentsChao Ming Chiang, Tim H. Wentzlaff, and Brian E. BentCite this: J. Phys. Chem. 1992, 96, 4, 1836–1848Publication Date (Print):February 1, 1992Publication History Published online1 May 2002Published in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComments on the surface energetics of polyacetyleneJan KloubekCite this: Langmuir 1992, 8, 2, 744–746Publication Date (Print):February 1, 1992Publication History Published online1 May 2002Published inissue 1 February 1992https://pubs.acs.org/doi/10.1021/la00038a073https://do…
Article Mechanical Behaviour and Orientation Characterisation of Drawn Isotropic Nylon-6,6 Fibres was published on February 1, 1992 in the journal Journal of the Mechanical Behavior of Materials (volume 3, issue 4).
Abstract Es wird über die Herstellung und Charakterisierung von dünnen Filmen aus Poly(p‐phenylen‐1, 3,4‐oxadiazolen) berichtet. Die aus H 2 SO 4 ‐Lösungen präparierten Filme besitzen eine gute optische Transparenz und sind mechanisch stabil. Filme aus Michungen mit Polyamiden zeigen ein ähnliches Verhalten und sind a…
Article Activation energies for thermal creep of the Zr1 %Nb alloy in the α-Zr and β-Zr phase regions / Aktivierungsenergien für thermisches Kriechen der Legierung Zr1 %Nb in der α-Zr- und β-Zr-Phase was published on February 1, 1992 in the journal Kerntechnik (volume 57, issue 2).
Magnesia‐partially‐stabilized zirconia (Mg‐PSZ) is industrially important because of transformable metastable tetragonal precipitates which interact with and arrest cracks. This work addresses the precipitation of tetragonal phases at one composition, 9.5 mol% MgO, throughout a range of temperatures. High‐purity zirco…
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.