Materials Literature
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Stainless steels undergo a sharp rise in pitting corrosion rate as the potential, solution concentration, or temperature is changed only slightly. We report experiments using real-time microscopic in situ visualizations that resolve the nucleation and evolution of individual pits during the transition. They suggest th…
We report on the experimental observation of magnetic hysteresis up to room temperature in thiol-capped Au nanoparticles with 1.4 nm size. The coercive field ranges from 860 Oe at 5 K to 250 Oe at 300 K. It is estimated that the Au atoms exhibit a magnetic moment of mu=0.036mu(B). However, Au nanoparticles with simila…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRecent Advances in the Liquid-Phase Syntheses of Inorganic NanoparticlesBrian L. Cushing, Vladimir L. Kolesnichenko, and Charles J. O'ConnorView Author Information Advanced Materials Research Institute, University of New Orleans, New Orleans, Louisiana 70148-2820 Cite this:…
Summary The organic matter (OM) of soils with andic properties has long been considered highly stable because of the presence of Al–humus complexes and sorption of organic ligands onto amorphous compounds. In this study, we characterized soils under different land use regimes located within an amphibolitic massif clos…
The conductivities of electrochemically prepared polyaniline (PAn) films have been determined using an atomic force microscopic tip with a conducting probe after the films were doped/dedoped at various potentials. The results indicate that the PAn films are rather inhomogeneous, even though the film is doped or dedope…
Abstract For Abstract see ChemInform Abstract in Full Text.
An effective strategy for making new ordered molecular materials by design is to build them from subunits that associate with their neighbors and thereby hold them in predetermined positions. Such tectons can be made by attaching multiple peripheral sites of association to geometrically suitable cores. In tectons 3 −…
https://doi.org/10.1021/ma048950i
We study heat conduction in a 1D chain of particles with longitudinal as well as transverse motions. The particles are connected by 2D harmonic springs together with bending angle interactions. The problem is analyzed by mode-coupling theory and compared with molecular dynamics. We find very good, quantitative agreeme…
We have developed a method to coat single-walled carbon nanotubes attached to AFM tips with conformal fluorocarbon polymer films formed in an inductively coupled plasma reactor. The polymer provides a chemically inert and electrically insulating outer layer and mechanically stabilizes the attached nanotube sufficientl…
A combined coarse-graining and back-mapping approach to preparing relaxed systems of amorphous polymers with atomistic detail is presented and applied to the case of bulk amorphous cellulose. The coarse-grained model is first developed using results from a standard molecular dynamics atomistic simulation of octaose, i…
Summary The use of ultrasonic energy for the dispersion of aggregates in studies of soil organic matter (SOM) fractionation entails a risk of redistribution of particulate organic matter (POM) to smaller particle‐size fractions. As the mechanical strength of straw also decreases with increasing state of decomposition,…
We consider a regular chain of quantum particles with nearest neighbor interactions in a canonical state with temperature $T$. We analyze the conditions under which the state factors into a product of canonical density matrices with respect to groups of $n$ particles each and under which these groups have the same tem…
The oxidation of CO over Ru/MgO and Ru/SiO 2 catalysts was used as a simple model reaction to derive turnover frequencies at atmospheric pressure, which were observed to agree with kinetic data obtained under high-vacuum conditions with supported ruthenium catalysts and the RuO 2 (110) single-crystal surface. Thus, it…
Highly crystalline and monodisperse manganese ferrite nanocrystals were synthesized via the thermal decomposition of metal-surfactant complexes followed by mild chemical oxidation. Particle sizes could be varied from 5 to 13 nm by changing the experimental parameters. The uniformity of the nanocrystals was demonstrate…
A homogeneous wurtzite-to-rocksalt phase transformation in $\mathrm{ZnO}$ is studied using a first-principles pseudopotential method. The calculated transformation enthalpy barrier at the phase equilibrium transition pressure is much lower than the barriers previously studied in $\mathrm{SiC}$ and $\mathrm{GaN}$. $\ma…
Disc-shaped hexa-peri-hexabenzocoronenes (HBCs) peripherally substituted by flexible dodecyl chains (molecule 1) or rigid polyphenylene dendrons (molecules 2a,b and 3) were efficiently synthesized. Steric hindrance arising from the substituents, from less hindered dodecyl to bulky dendrons, was utilized to program the…
By taking careful account of slab thickness and adsorbate orientation effects we present, for the first time, periodic density functional calculations predicting the preference of water to adsorb in a molecular state on the ideal rutile TiO2(110) surface at all coverages < or =1 monolayer (ML). Moreover, while this ha…
The polarized Raman spectra of layered ruthenates of the Srn+1RunO3n+1 (n=1,2,3) Ruddlesden-Popper series were measured between 10 and 300 K. The phonon spectra of Sr3Ru2O7 and Sr4Ru3O10 confirmed earlier reports for correlated rotations of neighboring RuO6 octahedra within double or triple perovskite blocks. The obse…
We show by ab initio calculations that the electron-phonon coupling matrix element M of the radial breathing mode in single-walled carbon nanotubes depends strongly on tube chirality. For nanotubes of the same diameter the coupling strength |M|^2 is up to one order of magnitude stronger for zig-zag than for armchair t…