Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
A generalized hydrodynamic treatment of the dynamic behavior of transverse phenomena in a fluid is presented. An attempt is made to describe such phenomena (VH depolarized light scattering, flow birefringence, transverse sound or shear waves and viscous flow) in a consistent manner over a range of temperatures for whi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMercury-199 NMR study of the mercury cations (Hg2+, Hg22+, Hg32+, and Hg42+): the first example of mercury-mercury spin-spin couplingRonald J. Gillespie, Pierre Granger, Keith R. Morgan, and Gary J. SchrobilgenCite this: Inorg. Chem. 1984, 23, 7, 887–891Publication Date (Pri…
Through the use of modulation spectroscopy we have measured the absorption spectrum experienced by a weak probe beam in the presence of a saturating pump beam at two different wavelengths within the broad homogeneous absorption band of alexandrite. At 584 nm the absorption saturates at high pump intensities, and a hol…
We report a study of the magnetoresistance of the organic superconductor bis-tetramethyl-tetraselenafulvalenium perchlorate [${(\mathrm{TMTSF})}_{2}$Cl${\mathrm{O}}_{4}$] from 1.8 to 20 K in fields up to 79 kG, for current flow both parallel and perpendicular (${\stackrel{\ensuremath{\rightarrow}}{\mathrm{c}}}^{*}$) t…
Abstract The microstructure of polybutadiene produced by anionic initiation in diethyl ether and tetrahydrofuran with counterions Li + , Na + and K + was determined by 1 H‐ and 13 C‐NMR. Ionization suppressing salts were added in tetrahydrofuran to ensure that only the ion‐pair reaction was studied. Results are compar…
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…