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Abstract A structural investigation is described of poly( L ‐lactic acid) by best fitting of powder X‐ray diffraction patterns. The examined sample shows the already known pseudo‐orthorhombic α‐form, and it was possible to determine the location of the two 10 3 polymeric helices in the unit cell and the size distribut…
Three different industrial carbon blacks were characterized in their surface chemistry with respect to their relative abilities to activate molecular oxygen. A variety of techniques was used including x-ray diffraction, gasification experiments, electron spectroscopy as XPS and UPS, helium ion scattering spectroscopy,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFerroelectric polarization mechanisms in nylon 11J. I. Scheinbeim, J. W. Lee, and B. A. NewmanCite this: Macromolecules 1992, 25, 14, 3729–3732Publication Date (Print):July 1, 1992Publication History Published online1 May 2002Published inissue 1 July 1992https://pubs.acs.org…
The high‐temperature deformation behavior of a fine‐grained polycrystalline yttrium aluminum garnet (YAG) was studied in the temperature range of 1400° to 1610°C using constant strain rate compression tests under strain rates ranging from 10 −5 /s to 10 −3 /s. The stress exponent of the creep rate, the activation ener…
These studies evaluate the effect of biomedical polymers: Biomer, polydimethyl-siloxane (PDMS), polyethylene, expanded polytetrafluoroethylene (ePTFE), Dacron, and the control polystyrene with or without adsorbed proteins IgG, fibrinogen, and fibronectin on the ability of activated human monocytes/macrophages to produ…
Abstract Photoelectron peak areas are measured using various background removal methods. Linear, horizontal, Shirley's and Tougaard's backgrounds have been tested on many spectra for different pass energies in the spectrometer. These four values, obtained for each photoelectron line, are compared together and it is sh…
A morphous solids belonging to the systems Al 2 O 3 –Me 2 O (Me = Na, K) and Al 2 O 3 –B 2 O 3 were prepared by nitrate decomposition, introducing boron in the form of boric acid. Crystalline metastable solids with pseudotetragonal symmetry were obtained from thermal treatment at 850° to 900°C for the compositions Al…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescent mononuclear gold(I) phosphinesChristopher King, Mohammed N. I. Khan, Richard J. Staples, and John P. Fackler Jr.Cite this: Inorg. Chem. 1992, 31, 15, 3236–3238Publication Date (Print):July 1, 1992Publication History Published online1 May 2002Published inissue 1 J…
Electrochemical impedance spectrum of a metal hydride electrode was interpreted by an equivalent circuit including a reaction resistance on the alloy surface, a contact resistance between the current collector and the pellet, one related to alloy particle‐to‐particle contact, and a Warburg impedance. According to the…
Stark effect modulation of the optical absorption spectrum of 40 Å diam CdSe nanocrystals show the first excited state of these clusters has a dipole moment of 32±10 D.
The results of a linear-elastic analysis to determine the phase angle at the tip of an interface crack in the peel test are presented in this paper. The phase angle is fairly insensitive to the peel angle and, when the film and substrate have identical elastic properties, the mode-I and mode-II components of the crack…
Cascade molecules (arborols, dendrimers) can form larger structures with defined shape by self-association. Such a “supramolecular automorphogenesis” takes place with the amphiphilic arborol 1, which gels in aqueous solutions, forming single- and multistranded aggregates. Helical structures were detected by electron m…
The characteristics of a magnetic Ericsson refrigeration cycle are investigated on the basis of the thermodynamic properties of the ferromagnetic material. The effect of field-dependent heat capacity on regeneration is discussed. The coefficients of performance of the Ericsson magnetic refrigeration cycle are derived.…
Three hydroxyribonucleosides catalyzing the oxido-reduction of NADH and K3F3(CN)6 were purified from Torula yeast RNA by a series of steps including sodium dodecyl sulfate/phenol extraction, nuclease P1 digestion, alkaline phosphatase digestion, anion-exchange chromatography, and high performance liquid chromatography…
We have been investigating the growth of crystalline titanium dioxide films at deposition temperature between room temperature and about 400 °C. The films were prepared by a dc magnetron reactive sputtering on glass and Si(100) substrates. The structural properties of the films were analyzed by x-ray diffractometry. T…
New determinations of the surface-tension-anisotropy parameter ${\mathrm{\ensuremath{\varepsilon}}}_{4}$ of succinonitrile (SCN), pivalic acid (PVA), and a PVA--1%-ethanol mixture are reported. Effects of temperature gradients and crystal orientation are analyzed in detail. The experiments utilized numerical interpola…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of organosilicon compounds. 293. Preparation, characterization, and crystal structures of octasilacubanes and octagermacubanesAkira Sekiguchi, Tetsuo Yatabe, Hirokazu Kamatani, Chizuko Kabuto, and Hideki SakuraiCite this: J. Am. Chem. Soc. 1992, 114, 15, 6260–6262P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThird-order optical nonlinearities of bis(phthalocyanines)James S. Shirk, J. R. Lindle, F. J. Bartoli, and Michael E. BoyleCite this: J. Phys. Chem. 1992, 96, 14, 5847–5852Publication Date (Print):July 1, 1992Publication History Published online1 May 2002Published inissue 1…
The preparation, the electrical and rheological properties as well as the electrochemical behavior of gel electrolytes made of (PC) electrolyte mixed with poly(methylmethacrylate) polymer (PMMA) as a stiffener are described. The addition of PMMA in various proportions to (M)‐PC electrolyte considerably increases the v…
Passive films on stainless steels, which are known to exhibit a significantly different susceptibility to pitting corrosion (DIN 1.4301, 1.4439, 1.4529), were examined in situ by photoelectrochemistry. The results show that the photoresponse is determined by the defects in the electronic structure of the films leading…