Materials Literature
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For the past decade, materials research has focused on synthesizing new materials and generating new structural arrangements that exhibit specific desired properties. Some of the greatest advances in this area have come out of work on intercalation compounds, which are formed by the insertion of atomic or molecular la…
A model considering both short-range and long-range interactions for liquid crystals mixtures of rod-like and plate-like molecules is presented in this paper. The model is treated in the framework of a mean field, van der Waals-type theory. The relationship of the model to a Landau-type treatment is discussed in an Ap…
Abstract Addition of cryoground rubber (CGR) causes changes in curing characteristics (decrease in Mooney scorch time, optimum cure time, and reversion time) and shows a detrimental effect on most of the vulcanizate properties (tensile, resilience, flex, hysteresis, set, and abrasion). Tear strength, however, is not a…
The greatest value ever reported for spontaneous polarization, as high as 4.2×10 -8 C/cm 2 , is observed in DOBA-1-MBC. The relaxation frequency of this material determined from frequency dependence of the dielectric constant is higher than that of DOBAMBC by more than one order of magnitude. DOBA-1-MPC also indicates…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIron porphyrin-nitrene complexes: preparation from 1,1-dialkylhydrazines. Electronic structure from NMR, Moessbauer, and magnetic susceptibility studies and crystal structure of the [tetrakis(p-chlorophenyl)porphyrinato][(2,2,6,6-tetramethyl-1-piperidyl)nitrene]iron complexJ…
Cyclopentadienyllanthanoids (C5H5)3M(thf) (M = Ce, Nd, Sm, Gd or Er; thf = tetrahydrofuran), (C5H5)3M (M = Er or Yb), (MeC5H4),M (M = Nd, Sm or Gd), (C5H5)2Yb, (C5H5)2Yb(dme) (dme = 1,2-dimethoxyethane), and (MeC5H4)2Yb(thf), have been synthesized in satisfactory-to-good yield by reaction of the lanthanoid elements wi…
The static structure factor for colloidal suspensions in systems undergoing steady shear flow is calculated using response theory in the linear regime and using a fluctuating-diffusion equation in the nonlinear regime. In the second case, the intermediate-scattering function is also obtained. The theories give the str…
Abstract A mathematical model for prediction of the crystal size distribution from a continuous crystallizer is presented. The kinetic data used for the model were obtained from batch contact nucleation experiments with citric acid monohydrate. In these experiments, the distribution of growth rates as well as the init…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallization, melting, and morphology of low molecular weight polyethylene fractionsG. M. Stack, L. Mandelkern, and I. G. Voigt-MartinCite this: Macromolecules 1984, 17, 3, 321–331Publication Date (Print):March 1, 1984Publication History Published online1 May 2002Publishe…
The shear flow of nematic Liquid crystals with a positive value of the Leslie viscosity α3 is studied theoretically. Under the assumption that the director will remain in the plane of shear, the equations governing the flow are solved numerically and the director- and velocity-profile are calculated. The validity of t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGas-phase reactions of oxoiron(1+) ion (FeO+) with hydrocarbonsT. C. Jackson, D. B. Jacobson, and B. S. FreiserCite this: J. Am. Chem. Soc. 1984, 106, 5, 1252–1257Publication Date (Print):March 1, 1984Publication History Published online1 May 2002Published inissue 1 March 19…
As is well known, electron energy loss spectroscopy can be used to determine the relative sample thickness in the electron microscope. This paper considers how such measurements can be applied to biological samples in order to obtain the mass thickness for quantitative X-ray microanalysis. The important quantity in es…
Tetrasulfonated iron phthalocyanines ( FePcS ) can be incorporated into electronically conducting polypyrrole by electrochemical polymerization of pyrrole in the presence of FePcS . The FePcS modified glassy carbon electrodes catalyzed the reduction of O 2 at potentials 250 to 800 mV less negative than at bare glassy…
The globular domain of collagen IV was solubilized by collagenase digestion from a mouse tumor, human placenta and bovine aorta and was purified by chromatographic methods. The materials show a unique, mainly non-collagenous amino acid composition and contain small amounts of glucosamine and galactosamine. The globula…
In studies on the cause of the extreme stability of the macromolecules of Thermus thermophilus HB8, the leuB gene coding for 3-isopropylmalate dehydrogenase of the leucine synthesis pathway and its flanking regions were cloned and sequenced. The leuB gene of T. thermophilus was expressed in a leuB-less mutant of Esche…
Abstract Calcium carbonate fillers react with hydrogen chloride liberated during pyrolysis of PVC to an extent depending on their particle sizes and concentrations. The effects of these and other fillers on the critical oxygen index is more complex and depends on a number of factors additional to the extent of hydroge…
The population dynamics during 69 yr of 12 plankton diatom taxa in a eutrophic lake have been analyzed. The data were obtained by microstratigraphical analysis of diatom frustules in the annually laminated sediment deposited at 17 m depth in the lake. On the basis of the recurring seasonal sequence of diatoms within m…
Raman spectra were measured for a series of Na 2 O·xZnO·ySiO 2 glasses where x=O to 2 and y = 1,2, or 3. The spectra exhibit bands characteristic of sheet‐like and chain‐like strucrural units. Frequency and intensity shifts with ZnO content suggest that Zn 2+ is a simple network modifier over this composition range.
Abstract Several Pt/TiO2 catalysts were prepared by photodeposition from aqueous H2PtCl6 in the presence or absence of a CH3COOH–CH3COONa buffer. The examination of these catalysts by X-ray photoelectron spectroscopy (XPS) revealed that the higher the buffer concentration, the more highly reduced the deposited platinu…
Abstract PET formulations containing small amounts of nonalkali metal hydroxides were prepared by extrusion from the melt. The efficiency of the hydroxides as nucleating agents was estimated from the elevation of T cc , the crystallization temperature upon cooling from the melt, normalized for the purpose of compariso…