Materials Literature
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The complex Ni[S2C2(CF3)2]2 reacts with light olefins, including ethylene and propylene, selectively and reversibly. The reaction is not poisoned by hydrogen gas, carbon monoxide, acetylene, or hydrogen sulfide, which are commonly present in olefin streams, presumably because olefin binding occurs through the sulfur l…
Intramolecular junctions in single-walled carbon nanotubes are potentially ideal structures for building robust, molecular-scale electronics but have only been studied theoretically at the atomic level. Scanning tunneling microscopy was used to determine the atomic structure and electronic properties of such junctions…
In this paper, a systematic study of the influence of various experimental parameters on the morphology and size of CaCO3 crystals after room-temperature crystallization from water in the presence of poly(ethylene glycol)-block-poly(methacrylic acid) (PEG-b-PMAA) is presented. The pH of the solution, the block copolym…
Fluorescence microscopy of nanoscale silver oxide (Ag2O) reveals strong photoactivated emission for excitation wavelengths shorter than 520 nanometers. Although blinking and characteristic emission patterns demonstrate single-nanoparticle observation, large-scale dynamic color changes were also observed, even from the…
Author: Straumal, B. B. et al.; Genre: Book Chapter; Issued: 2001; Keywords: MPI für Metallforschung; Abt. Mittemeijer; PERCENT SI ALLOY, WETTING TRANSITION, ENERGY, TIN, SEGREGATION, AL, TRANSFORMATION, PENETRATION, IMPURITIES, VICINITY; Title: Influence of grain boundary phase transitions on the properties of Cu-Bi…
One ring, two oxidations: The first doubly ring-oxidized metal phthalocyanine complex has been synthesized by galvanostatic electrocrystallization. Copper phthalocyanine was oxidized in the presence of perrhenate anions to form the new molecular compounds [Cu(pc)(ReO4)] and [Cu(pc)(ReO4)2] (structure shown). Single-cr…
The magnetic structure of nonstoichiometric ${\mathrm{LuFe}}_{4+\ensuremath{\delta}}{\mathrm{Al}}_{8\ensuremath{-}\ensuremath{\delta}}$ and ${\mathrm{YFe}}_{4+\ensuremath{\delta}}{\mathrm{Al}}_{8\ensuremath{-}\ensuremath{\delta}}$ compounds with a small Fe excess $(\ensuremath{\delta}\ensuremath{\sim}0.40)$ was invest…
A monotropic smectic A phase is exhibited by adducts of tris(β-diketonato)lanthanide(III) complexes with a non-mesomorphic salicylaldimine Schiff base as Lewis base. Only four terminal alkyl chains were necessary in the Schiff base to induce mesomorphism in [La(dbm)3] (see formula). Hdbm = 1,3-diphenyl-1,3-propanedion…
We study a dynamic model of relaxor ferroelectrics based on the spherical random-bond--random-field model and the Langevin equations of motion written in the representation of eigenstates of the random interaction matrix. The solution to these equations is obtained in the long-time limit where the system reaches an eq…
Magnetic properties correlated to structural transformations, from metastable hexagonal ${\mathrm{CaCu}}_{5}$-type phases to equilibrium tetragonal 1:12 phases, are studied systematically for nanocrystalline $\mathrm{Sm}({\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}{)}_{11}\mathrm{Ti}$ alloys $(x<~2).$ The Riet…
Electrodeposition of dendrimers containing redox-active tetrathiafulvalene units and coordinating crown ether moieties provides a novel strategy for producing modified electrodes that respond to the presence of a particular metal cation. Application of the third-generation dendrimer (see schematic diagram) to platinum…
The mechanism of nitrogen sorption in porous silica was investigated by small-angle neutron scattering (SANS). Two samples of porous silica were studied containing mesopores (pore sizes 5.5 and 9.5 nm, respectively) and additional micropores of irregular shape and statistical distribution. SANS curves were recorded at…
The highest nuclearity cyclic structure for the 3d metals is the Ni24 cage reported. It can be described as an octamer of trinuclear units (shown schematically), held together by metal–ligand bonds and a large number of hydrogen bonds.
We develop a continuum theory of linear viscoelastic response in oriented monodomain nematic elastomers. The expression for dissipation function is analogous to the Leslie-Ericksen version of anisotropic nematic viscosity; we propose the relations between the anisotropic rubber moduli and new viscous coefficients. A n…
Zone-center phonon frequencies of polar lattices are calculated for uniaxial crystals from the symmetry arguments. Long-range Coulomb forces and crystal anisotropy are explicitly taken into account. Free-carrier contributions into a dielectric constant are included. The angular dispersion of optical-phonon modes is co…
We calculate the rate of energy flow between two macroscopic bodies, each in thermodynamic equilibrium at a different temperature, and joined by a weak mechanical link. The macroscopic solids are assumed to be electrically insulating, so that thermal energy is carried only by phonons. To leading order in the strength…
It has been recently shown that the double exchange Hamiltonian, with weak antiferromagnetic interactions, has a richer variety of first- and second-order transitions than previously anticipated, and that such transitions are consistent with the magnetic properties of manganites. Here we present a thorough discussion…
This work deals with the analysis of experimental data on the average magnetization of $Fe_{1-x}Me_x$ (Me=Sn,Si) disordered alloys, the average and local hyperfine fields (HFF) at the Fe nuclei. The effect of the metalloid concentration on the HFF is studied with the help of the results of first- principles calculatio…
The convergence of our understanding of structure-property relationships for selected biological macromolecules and our increased ability to prepare large synthetic macromolecules with a structural precision that approaches that of proteins have spawned a new area of research where chemistry and materials science join…
Abstract The present book is the second edition of Amikam Aharoni's Introduction to the Theory of Ferromagnetism, based on a popular lecture course. Like its predecessor, it serves a two-fold purpose: First, it is a textbook for first-year graduate and advanced undergraduate students in both physics and engineering. S…