Materials Literature
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A series of AB/AB 2 etherimide copolymers with compositions ranging from 0 to 1 mole fraction AB monomer ( x AB ) were prepared and characterized. The weight-average molecular weight ( M w ) determined from SLLS and TriSEC experiments showed good agreement. No systematic variations were found in M w over the entire co…
Two macrocyclic porphyrin sandwich systems, 4 and 5, together with the linear compound 6 have been prepared and examined as saccharide receptors. The cyclic porphyrin-cryptand conjugates 4 and 5 bind saccharides efficiently in highly competitive media with a preference for trisaccharides probably due to a complementar…
A multinutrient soil extraction procedure in routine soil testing is attractive. Therefore, it has been suggested to convert conventional soil testing programs into a 0.01 M calcium chloride (CaCl2) multinutrient soil testing program using the relationship between test values of the 0.01 M CaCl2 extractant and those o…
The kinetics of solid-state polymerization (SSP) of poly(bisphenol A carbonate) was investigated with N 2 as the sweep gas. The N 2 flow rate and prepolymer particle size were chosen to eliminate the influence of both external and internal phenol diffusion, and to ensure that the kinetics was controlled by the rate of…
Fibrillar collagens have a long triple helix in which glycine is in every third position for more than 1000 amino acids. The three chains of these molecules are assembled with specificity into several different molecules that have tissue-specific distribution. Mutations that alter folding of either the carboxy-termina…
Data on the interaction of carbon nanomaterials (fullerenes, carbon nanotubes, graphite nanofibres and their metal-doped modifications) with hydrogen are surveyed. New results on the preparation and properties of hydrofullerenes are presented. The prospects for the use of carbon nanomaterials as reversible hydrogen so…
Multinanometer-long end-capped poly(triacetylene) (PTA) and poly(pentaacetylene) (PPA) oligomers with dendritic side chains were synthesized as insulated molecular wires. PTA Oligomers with laterally appended Fréchet-type dendrons of first to third generation were prepared by attaching the dendrons (8, 13, and 17, res…
Peer reviewed: Yes
Four forms of nickel(II) and two of zinc(II) dibenzoylmethanates have been isolated and characterized with powder and single-crystal X-ray diffraction analyses, differential scanning calorimetry, magnetic susceptibility measurements, and solid-state 13C cross-polarization/magic angle spinning NMR. Nickel dibenzoylmeth…
The mechanism of diffusion-free (thermoelastic) martensitic transitions in solids is theoretically examined using a thermodynamic approach together with a self-consistent-field order parameter model. Based on the resulting equations, a theory of smeared martensitic transitions is constructed as a kinetic equilibrium t…
The new metal-metal bonded diruthenium(II,III) compounds [Ru2(O2CCH3)4(mu-L)]infinity (L = N(CN)2-, 1; C(CN)3-, 2) and [[Ru2(O2CCH3)2(mhp)2]2(mu-DM-Dicyd)] (3) (mhp = 2-oxy-6-methylpyridinate, DM-Dicyd = 1,4-dicyanamido-2,5-dimethylbenzene dianion) have been synthesized and fully characterized. Compounds 1 and 2 were…
We report the rational design and development of nanostructured thin-film materials that are highly efficient for surface-enhanced optical processes such as surface-enhanced Raman scattering (SERS). These materials consist of fractionated colloidal Ag particles in the size ranges of 30−50, 50−80, 80−100, and >100 nm.…
The catalytic asymmetric epoxidation of enones using the La-BINOL-Ph(3)As=O complex generated from La(O-i-Pr)(3), BINOL, and Ph(3)As=O in a ratio of 1:1:1 is described herein. Using 1-5 mol % of the asymmetric catalyst, a variety of enones, including a dienone and a cis-enone, were found to be epoxidized in a reasonab…
In this review the double exchange (DE) model forming a basis for the description of the physics of colossal magnetoresistance manganites is discussed. For a limiting case of exchange interaction which is large compared with the band width, the effective Hamiltonian of the DE model is derived from that of the sd-excha…
In ferromagnetic thin films, the Curie temperature variation with the thickness is always considered as continuous when the thickness is varied from $n$ to $n+1$ atomic planes. We show that it is not the case for Fe in Fe/Ir superlattices. For an integer number of atomic planes, a unique magnetic transition is observe…
The high-temperature cubic-tetragonal phase transition of pure stoichiometric zirconia is studied by molecular dynamics (MD) simulations and within the framework of the Landau theory of phase transformations. The interatomic forces are calculated using an empirical, self-consistent, orthogonal tight-binding (SC-TB) mo…
High-pressure resistivity experiments were performed on the recently discovered superconductor, MgB2. Tc decreases quasi-linearly with applied pressure to 1.4 GPa at a rate of -2.0(1) K/GPa, which is somewhat larger than that derived from recently-reported ac susceptibility measurements. The reduction of Tc is consist…
In this paper, we'll answer several abstract, formal questions about the nature of crack growth and nucleation. Bringing a field theory point of view to fracture illuminates things in what I hope will be an entertaining way. Formally, what is the crack nucleation rate? Fracture is an instability of elastic theory unde…
The reactivities of metallic nanosystems in catalytic processes are considered. The activities of nanoparticles in catalysis are due to their unique microstructures, electronic properties and high specific surfaces of the active centres. The problems of increasing the selectivities of catalytic processes are discussed…
A series of nanocomposite materials that consisted of emeraldine base of polyaniline and layered montmorillonite (MMT) clay were prepared by effectively dispersing the inorganic nanolayers of MMT clay in organic polyaniline matrix via in-situ polymerization. Organic aniline monomers were first intercalated into the in…