Materials Literature
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The surface-enhanced Raman spectrum of 2,2’-bipyrimidine adsorbed on silver sol has been obtained and analyzed by using a vibrational assignment previously determined for this azoaromatic molecule. Evidence was found for Ag-N bond formation with the silver substrate and a model is proposed for the adsorption on the ba…
Orbital angular momentum is necessary in order to have magnetic anisotropy. In a magnetic system, orbital angular momentum is caused by spin-orbit coupling as well as by many-body correlation effects. Standard band-structure calculations only include the first of these two contributions. In this paper it is argued tha…
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Rosette‐shaped clusters of barite crystals were found on the depositional surface and in the inner, complex crossed‐lamellar shell layer of Corbicula fluminea collected from the Maurice River, New Jersey. Morphological analyses revealed that barite crystallized directly from the extrapallial fluid onto the inner shell…
Magnetic and structural characteristics of RCo5−xAlx have been established for R=Y, La, Ce, Pr, Nd, Sm, Gd, Dy, Er, and Tm. All systems have the CaCu5 structure. Al and Co are randomly distributed over the Co-sublattice sites. Al-substitution decreases μCo and Tc and significantly alters magnetic anisotropy. Analysis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVisible-light-mediated living and immortal polymerizations of epoxides initiated with zinc complexes of N-substituted porphyrinsYoshihiko Watanabe, Takuzo Aida, and Shohei InoueCite this: Macromolecules 1990, 23, 10, 2612–2617Publication Date (Print):May 1, 1990Publication H…
In this paper three examples of new liquid crystalline compounds with azamacrocyclic cores are described. A part from a substituted hexacyclene with twelve alkoxy sidechains, two triazacrownether derivatives are presented. Their discotic molecular shape causes mesomorphic behaviojr, which is characterized by means of…
The temperature dependence of the layer compressional elastic constant B has been studied in four different compounds. Two of them, 4-cyano-4'-(n-octyl)biphenyl and 4-cyano-4'-(n-octyloxy)biphenyl, are polar and give partially bilayered smectic-${\mathit{A}}_{\mathit{d}}$ phases while the remaining two are nonpolar an…
Electrostatic energies of interaction between type I collagen molecules were calculated, using models developed by Timasheff and Hill. These energies, along with a contribution from hydrophobic forces, were then incorporated into an equation due to Flory that described phase equilibria of rod-like polymers. The Flory…
The resonance Raman spectra of water-soluble porphyrins, Cu(TMpy-P4) and Ni(TMpy-P4), and their mixtures with DNA, Poly(dG-dC).Poly(dG-dC), and Poly(dA-dT).Poly(dA-dT) were measured using 426 nm pulsed laser excitation (and 556 nm for some applications). At high laser power, the solution of Cu(TMpy-P4) mixed with DNA…
Structural and magnetic properties of the ternary R14Fe78C8 compounds, where R=Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, and Lu, were systematically investigated. By means of properly annealing treatment, the tetragonal structure isotropic to the Nd2Fe14B phase could be well formed in the above compounds. The lattice constants…
Thermoluminescence characteristics of a new phosphor, LiNaSO4:Eu, are reported. The phosphor has a prominent glow peak around 405 K, emission around 412 nm, which lies in the most sensitive region of the common photomultiplier tubes, good sensitivity, excellent reusability and moderate fading. It is suggested that the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRectifying bi-layer electrodes: layered conducting polymers on platinumWalter Torres and Marye Anne FoxCite this: Chem. Mater. 1990, 2, 3, 306–311Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Published inissue 1 May 1990https://pubs.acs.or…
An experiment was carried out to investigate the effect of La/sub 2/O/sub 3/ on the magnetic and physical properties of strontium ferrite magnets. It was found that the La/sub 2/O/sub 3/ addition to SrO-6Fe/sub 2/O/sub 3/ (stoichiometric composition) was very useful in stabilizing the magnetoplumbite structure and tha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of various exposure histories on sorption and dilation in a family of polycarbonatesD. S. Pope, G. K. Fleming, and W. J. KorosCite this: Macromolecules 1990, 23, 11, 2988–2994Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Published i…
Abstract The prominence of carbonates in nature and their potential competitiveness with organic acids for sorption sites in soils may be underestimated by researchers who study the mobility of natural organic matter. The pH‐dependent adsorption envelopes of Na salts of acetic acid (AcOH) and carbonates (H 2 CO 3 , HC…
We examined the usefulness of MnCl2 entrapped in liposomes as a liver specific contrast agent for magnetic resonance imaging. Toxicity experiments showed that the effective dose for imaging experiments was 7 to 11 times lower than the LD50 of free MnCl2. In rats with implanted liver tumors, liposome encapsulated MnCl2…
The ternary alloy Dy0.7Tb0.3Fe1.9, known as Terfenol-D, is a highly magnetostrictive alloy with magnetostriction coefficients along the principal crystallographic directions of λ111=1640×10−6 and λ100≤100(±30)×10−6. The bulk magnetostriction λ is dependent on the state of magnetization M, on the original domain config…
Visual observations and preliminary light scattering experiments on the crystallization process in various colloidal systems are reported. In the first place we studied the influence of the stabilizing coating of the colloidal particles on the rate of crystallization. The various coatings give rise to different ranges…
Three new rare earth–iron ternary compounds with the La6Ga3Co11 structure (I4/mcm), Pr6Ga3Fe11, Nd6Ga3Fe11, and Sm6Ga3Fe11, are found to be ferromagnetic with Curie temperatures of 320, 397, and 462 K, respectively. Large anisotropies have been observed from the magnetization curves and the anisotropy field is larger…