Materials Literature
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The solid solutions (x)PbTiO3-(1−x)Bi(Zn1∕2Ti1∕2)O3, (x)PbTiO3-(1−x)Bi(Zn1∕2Zn1∕2)O3, and (x)PbTiO3-(1−x)Bi(Zn1∕2Sn1∕2)O3, have been examined by x-ray diffraction, dielectric measurements, and thermal analysis. Unlike most PbTiO3-based solid solutions, these systems show enhanced tetragonality with substitution for Pb…
A liquid-phase redox process has been designed to prepare monodispersed Co 3 O 4 nanocrystals with particle sizes of 2 nm (spherical), 2.5 nm (cubelike), and 4.7 nm (cubelike). The nanocrystals were characterized by transmission electron microscopy (TEM), high-resolution TEM, X-ray diffraction, X-ray photoelectron spe…
The behavior of mixtures of polymers with carbon nanotubes are reviewed. The use of polymers as dispersing agents of individual CNT is described in detail. Two groups of polymer–CNT systems are presented. One corresponds to the case in which the polymer–CNT interactions modify the electronic properties of the tubes. T…
The three diamagnetic square planar complexes of nickel(II), palladium(II), and platinum(II) containing two S,S-coordinated 3,5-di-tert-butylbenzene-1,2-dithiolate ligands, (L(Bu))(2-), namely [M(II)(L(Bu))(2)](2-), have been synthesized. The corresponding paramagnetic monoanions [M(II)(L(Bu))(L(Bu)(*))](-) (S = (1)/(…
Strong photoluminescence in the blue region of the visible spectrum was observed for a dispersion of allylamine-capped silicon quantum dots in water. Their ease of synthesis and optical properties make them excellent candidates for biomedical applications, as demonstrated by their incorporation inside the cytosol of H…
Abstract Biodegradable composites were prepared using microcrystalline cellulose (MCC) as the reinforcement and polylactic acid (PLA) as a matrix. PLA is polyester of lactic acid and MCC is cellulose derived from high quality wood pulp by acid hydrolysis to remove the amorphous regions. The composites were prepared wi…
The accumulation of calcium carbonate (referred to as scale) on the surface of cross-linked polyethylene and polypropylene random copolymer tubes is compared to that on copper. Water with total calcium and carbonate concentration of 3×10−3M and a pH of approximately 9.1, yielding a supersaturation of 7.8, was pumped t…
We adopt the cluster size distribution model to investigate the effect of temperature on homogeneous nucleation and crystal growth for isothermal polymer crystallization. The model includes the temperature effects of interfacial energy, nucleation rate, growth and dissociation rate coefficients, and equilibrium solubi…
Abstract A novel synthetic method for soluble precursor polymers of poly( p ‐phenylene vinylene) (PPV) derivatives by the palladium‐catalyzed three‐component coupling polycondensation of aromatic diiodides, aromatic bis(boronic acid) derivatives, and norbornadiene is described. For example, the polymerization of 1,4‐d…
Purpose Copper and its alloys are widely used in industries because of their good resistance to corrosion and are often used in cooling water systems. Brass has been widely used for shipboard condensers, power plant condensers and petrochemical heat exchangers. Brass is susceptible to the corrosion process known as de…
Abstract Summary: A bacterial poly[(3‐hydroxybutyrate)‐ co ‐(3‐hydroxyvalerate)] biosynthesized by Pseudomonas sp. HJ‐2 was found to be a shape memory polymer. Permanent shapes were set by annealing at room temperature the samples that had been pre‐treated above 95 °C in specified shapes. The temporary shapes were set…
A highly (111) oriented CuI/beta-cyclodextrin inorganic/organic composite film on glass substrates was deposited from a dispersion of CuI and beta-cyclodextrin in a mixture of acetonitrile and dimethylformamide (DMF) solvents, in which DMF plays an important role in the orientation of CuI film. The composite film exhi…
Boundary driven shear flows and wall thermostats are being used in computer simulations of materials with increasing frequency. One attraction is that such boundary constraints offer a more realistic representation of the physical constraints imposed experimentally than the widely employed homogeneous constraints. In…
We demonstrate a new and versatile nonlithographic strategy for the lateral patterning of semiconducting quantum dots (QDs) in thin polymer films via phase separation between two immiscible polymer components, one of which is attached as a stabilizing layer to the QD surface. Simple spin-casting of blend solutions con…
Synchrotron-based high-resolution photoemission was used to study the adsorption and chemistry of SO(2) on AuCeO(2)(111) and AuO(x)CeO(2) surfaces. The heat of adsorption of the molecule on Au nanoparticles supported on stoichiometric CeO(2)(111) was 4-7 kcalmol larger than on Au(111). However, there was negligible di…
Abstract Heterotrinuclear pyridinecarboxylate complexes of nickel( II ) and palladium( II ) of the types [Ni(mcN 3 )(pyridinecarboxylate)] 2 {μ‐[Pd(C 6 F 5 ) 2 ]}(PF 6 ) 2 [mcN 3 = 2,4,4‐trimethyl‐1,5,9‐triazacyclododec‐1‐ene (Me 3 ‐mcN 3 ) or 2,4,4,9‐tetramethyl‐1,5,9‐triazacyclododec‐1‐ene (Me 4 ‐mcN 3 )] have been…
Dielectric spectroscopy, lattice structure, and thermal properties have revealed the relaxor dielectric response of Ba-substituted lead zirconate/titanate (PZT) having the composition $({\mathrm{Pb}}_{0.71}{\mathrm{Ba}}_{0.29})$ $({\mathrm{Zr}}_{0.71}{\mathrm{Ti}}_{0.29}){\mathrm{O}}_{3}$ and containing $2\phantom{\ru…
Hartree-Fock calculations and electron transfer (ET) theory were used to model the effects of compositional defects on ET in the brucite-like octahedral sheet of mica. ET was modeled as an Fe(IIIII) valence interchange reaction across shared octahedral edges of the M2-M2 iron sublattice. The model entails the hopping…
The large length and time scales involved in polymer simulation render the atomistic representation of polymer systems a computationally expensive and unnecessarily detailed procedure. We present a novel coarse-graining method for the description of nonbonded interactions between moieties composing the monomeric units…
Amorphous glassy CaCO3 colloidal spheres of monomodal size distribution were studied by high-resolution Brillouin light scattering. The Young modulus of 37 GPa and shear modulus of 14 GPa of glassy CaCO3 at a density of 1.9 g/cm3 were extracted from the particle vibration frequencies by employing acoustic wave scatter…