Materials Literature
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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…
A convective drying model is proposed which may be used to describe the drying behavior of leather. Using this model, the calculated transient leather temperature agrees well with experimental values. Variations in temperature and moisture content distribution are solved using the finite-difference method. The effects…
Polarized Cu K x-ray absorption near-edge structure spectra of CuO are measured and analyzed with the aim of extracting quadrupole and dipole partial spectral components. Theoretical spectral components are calculated within the framework of real-space multiple-scattering technique, relying on a non-self-consistent mu…
A novel method to reversibly modify the surface of gold nanoparticles is developed through electrostatic interaction between cationic tetraoctylammonium surfactant and anionic carboxylate groups. The particles can be extracted from the water phase into the toluene phase without aggregation after the adsorption of the…
Nanosize (5−7 nm) supported Co II Al-hydrotalcite-like compounds (Co II Al-HTlcs) on γ-Al 2 O 3 have been synthesized with a coprecipitation method in which the γ-Al 2 O 3 acts as a source of aluminum for coprecipitation and a support for the compound formation. The synthesis parameters identified are initial concentr…
Silylation reactions using liquid and supercritical CO 2 as the solvent were performed on both single surface (silicon wafers) and nanoporous (silica gel) silica samples. The alkylsilyl monolayers formed on single surfaces were characterized by wettability, ellipsometry, and X-ray photoelectron spectroscopy. Modified…
Partial Fischer esterification of poly(acrylic acid) allows tailoring of the hydrophobicity and charge density of multilayered films containing poly(allylamine hydrochloride) (PAH) and derivatized poly(acrylic acid) (d-PAA). As hydrophobicity and charge density strongly affect film permeability, control over these pro…
As high-throughput experimental techniques have become common in the area of materials research, entirely new types of experimental strategies have appeared. The kinds of problems, the desired outcomes, and the appropriate patterns are significantly different from those associated with conventional experimentation. Cl…
A few years ago we developed a new kinetic method for following transition-metal nanocluster formation in which the resultant nanocluster's catalytic activity was used as a reporter reaction via the pseudoelementary step concept. This method in turn yielded insights into a new, broadly applicable mechanism of nanoclus…
Hot solutions (>80 °C) of N -dodecanoyl- ( d - or l -) serine in toluene or water were cooled to room temperature to give gels and were then vitrified for cryo-TEM investigations. Electron micrographs showed multilamellar aggregates with a repetitive density profile of 33 Å as constituents of tubules and vesicles in t…