Materials Literature
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Langmuir−Blodgett (LB) films (nine double layers) of 2-[4-( N -dodecanoylamino)phenyl]-5-(4-nitrophenyl)-1,3,4-oxadiazole on gold were analyzed by means of infrared (IR) ellipsometry followed by theoretical interpretation of the measured spectra in a uniaxial anisotropic layer model. The same material in a KBr pellet…
The local spin method suggested previously for defining the spin state of an atom in a molecule is applied to model manganese complexes with three and four manganese centers. This method extracts from the wave function a spin for the manganese centers that has been compared to the one suggested by chemical intuition.…
Hydrogen/deuterium exchange rates in amide-functionalized monolayer protected gold clusters (MPCs) are controlled by the radial nature of the surface, with inhibition and catalysis observed at different chain lengths.
Sweating operations were explored for various crystalline layers obtained during layer-melt crystallizations. The crystalline layers used in sweating operations were crystallized at different cooling rates of 0.1, 1, and 5K/min, and different feed compositions of 80, 85, and 90 wt% caprolactam–cyclo hexanone mixtures.…
The Langmuir, Freundlich, and Temkin isotherms were fitted to copper (Cu) adsorption data of 20 highly calcareous soils of Fars Province, ranging widely in relevant physical and chemical characteristics. One-gram samples of each soil were equilibrated for 24 h with 30 mL of 0.01 M CaCl2 containing 50 to 500 mg Cu L−1.…
Abstract The deformation behavior of homogeneous ethylene‐1‐octene copolymers was investigated as a function of the crystallinity and the crystal size and perfection, respectively, by wide‐ and small‐angle X‐ray scattering using synchrotron radiation. The crystallinity and the crystal size and perfection, respectively…
Stable and structurally simple chiral tetrafluorophenyl-gold(I) isocyanide complexes [Au(C 6 F 4 OR 1 )(C⋮NC 6 H 4 C 6 H 4 OR 2 )] [R 1 = (R)-2-butyl, R 2 = C n H 2 n +1 ( n = 2, 10); R 1 = C m H 2 m +1 ( m = 2, 10), R 2 = (R)-2-butyl; R 1 = R 2 = (R)-2-butyl] displaying a twist-grain boundary phase (TGBA*) and blue p…
Abstract We report the first in situ XPS analysis of thin epitaxial films of the ferromagnetic double perovskite Sr 2 FeMoO 6 , which have been prepared by pulsed laser deposition on (100) SrTiO 3 substrates under different oxygen pressures. The films consist mainly of the c ‐axis‐oriented SFMO phase over a wide range…
Abstract Electrically conducting polypyrrole films doped with dodecylbenzenesulphonic acid (PPy–DBSA) have been electrochemically polymerized on stainless steel. The surface and electrochemical properties of the films were investigated by a combination of cyclic voltammetry (CV), scanning electron microscopy (SEM) and…
The room-temperature microstructure of the giant magnetocaloric material ${\mathrm{Gd}}_{5}{\mathrm{Si}}_{2}{\mathrm{Ge}}_{2}$ is investigated using transmission electron microscopy and selected area diffraction. Nonmerohedral twinning is identified and its twin law, which relates one twin component to the other, is r…
Several testable models for stress-corrosion cracking (SCC) of metals are discussed in terms of the main experimental variables: stress, metallurgy, and environment. Slip-dissolution, film-induced cleavage, and hydrogen embrittlement models are all shown to be consistent with experimental data in particular systems. O…
The total contents of potassium (K) and magnesium (Mg) in selected Brazilian soils (Oxisols, Ultisols, Inceptsols, and Alfisols) developed from different parent materials were investigated to estimate the contribution of clay minerals to K and Mg reserves. Total K and Mg contents in the Na-saturated clay were determin…
A chiral azobenzene derivative containing a cyclic syn-carbonate moiety functions as a gelator for various organic solvents; the dipole-dipole interaction drives the fibrous self-assembly of the rodlike gelator.
Abstract Blends of poly( L ‐lactic acid) (PLA) and poly(butylene succinate) (PBS) were prepared in various compositions via melt mixing, and the morphological changes were investigated with differential scanning calorimetry and synchrotron wide‐angle and small‐angle X‐ray scattering techniques at a heating rate of 10…
Thin AgO films are readily photoactivated at room temperature to produce dynamic, multicolored fluorescent Ag n nanoclusters. Writing efficiencies were separately examined as functions of excitation wavelength, intensity, and environmental interactions. The effects of external conditions on written nanocluster fluores…
Melt surface tensions and pressure−volume−temperature ( PVT ) data were obtained for many hydrophobic and hydrophilic polymers including high melting polyesters and polyamides such as poly(ethylene terephthalate) and nylon 66. A model is developed that uses surface tension to convert PVT data (from which the thermodyn…
Using Langevin simulations, we examine driven colloids interacting with quenched disorder. For weak substrates the colloids form an ordered state and depin elastically. For increasing substrate strength, we find a sharp crossover to inhomogeneous depinning and a substantial increase in the depinning force, analogous t…
The cylinder-to-gyroid transition in a block copolymer solution has been studied using a combination of rheology and small-angle X-ray scattering (SAXS). A poly(styrene- b -isoprene) diblock copolymer with block molecular weights of 11 000 and 32 000 g/mol, respectively, dissolved in the styrene-selective solvent di-…
In solution phase synthesis of nanoparticles, processes such as coarsening and aggregation can compete with nucleation and growth in modifying the particle size distribution in the system. We show that coarsening of ZnO and ${\mathrm{TiO}}_{2}$ nanoparticles in solution follows the Lifshitz-Slyozov-Wagner rate law for…
Nanostructures (e.g., nanotubes and nanofibers) of polyaniline (PANI) with an average diameter of 110−130 nm and a conductivity of 2.5 × 10 - 2 S/cm were synthesized by a self-assembly process in the presence of azobenzenesulfonic acid (ABSA) as a dopant. It was found that the formation probability and size of PANI−AB…