Materials Literature
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Corrosion inhibition of a mild steel in acid solutions by alkylamines (ALK-AM) and aniline hydrochloric (ANL-HCl) salts was investigated in the presence of sodium sulfate (Na2SO4) and sodium chloride (NaCl) using a potentiostat, a contact-angle goniometer, a scanning electron microscope (SEM), a Fourier transform infr…
A new way to synthesize trans-disubstituted cyclam tetraazamacrocycles 1 is reported. The synthesis proceeds in three steps via the tricyclic 1,4,8,11-tetraazatricyclo[9.3.1.14,8]hexadecane system 2, which can be selectively dialkylated and hydrolyzed under basic conditions to give the final product 1. An understandin…
The efficiency of various imidazole derivatives as corrosion inhibitors for copper in hydrochloric and sulfuric acids (HCl and H2SO4) was investigated. Electrochemical measurements showed the organic compounds investigated have fairly good inhibiting properties, except for 4-methyl-5-imidazolecarbaldehyde in HCl. Prot…
The effective anisotropy of hard-soft magnetic nanostructures is analyzed using the concept of the exchange correlation length of both phases. The dependence of coercivity on volume fraction, fluctuation length, temperature, and magnetic properties of the components is derived from the degree of magnetic coupling, def…
Rapid percolation enhances dissolved organic matter (DOM) transport in soils. One reason for this is nonequilibrium conditions, which make the time-dependence of the sorption/desorption an important parameter. We investigated the time-dependent DOM release and sorption of four soils (one topsoil, three subsoils) with…
Photon scattering angular distributions from various animal tissues were measured at two energies of a monochromatic synchrotron x-ray beam. Two plastics and human breast tissue were also measured. From these two measurements, the molecular coherent scattering form factor of each material was extracted. A new data ana…
The plasma chemistry of an argon/hydrogen expanding thermal arc plasma in interaction with silane injected downstream is analyzed using mass spectrometry. The dissociation mechanism and the consumption of silane are related to the ion and atomic hydrogen fluence emanating from the arc source. It is argued that as a fu…
Abstract Soil organic matter (SOM) in many tropical soils is less stable than that of temperate soils, in part due to faster decomposition processes in the tropics, but possibly also due to different mechanisms of organomineral stabilization. We studied the mineral associations of SOM in the surface horizons of two se…
Previously we reported P 2 W 15 Nb 3 O 62 9- polyoxoanion- and Bu 4 N + -stabilized, 20 ± 3 Å, Ir(0) ∼ 300 nanoclusters. These nanoscopic materials are synthesized from the reduction of [(C 4 H 9 ) 4 N] 5 Na 3 [(1,5-COD)M·P 2 W 15 Nb 3 O 62 ] (M = Ir) by H 2 in acetone and are isolable, highly catalytically active, wi…
The chemical synthesis of linear polyesters with various hydrophilic functional groups is difficult, involving a multistep reaction pathway and synthesis of a suitable monomer with a protected functional group. A straightforward conventional synthesis from a trifunctional compound, such as glycerol, and a diester or d…
Summary The rate at which minerals in the soil weather is affected by pH and concentration of organic solutes (DOC). The rates of release of Al, Ca, Fe, K, Mg, Na, P and Si from a mineral soil sample to solutions of natural organic solutes and HCI (control) were determined at pH 3 and 4 for up to 17 weeks. Soil soluti…
The resistivity in the ferromagnetic state of flux-grown ${\mathrm{La}}_{2/3}{(\mathrm{P}\mathrm{b},\mathrm{C}\mathrm{a})}_{1/3}{\mathrm{MnO}}_{3}$ single crystals, measured in magnetic fields up to 7 T, reveals a strong quadratic temperature dependence at and above 50 K. At lower temperatures, this contribution drops…
High-resolution NMR data for lithium and sodium in silicate, aluminosilicate, germanate, borate, and tellurite glasses and glass melts all show systematic effects of composition on isotropic chemical shift. The most reliable interpretation of these data is through well-established correlations of increased (higher fre…
Abstract We report the photogeneration of solitons and polarons in the quasi-one-dimensional (1-D) halogen (X)-bridged metal (M) compounds (simply abbreviated as the MX chain compounds). The most significant feature of this system is the remarkable tunability of the charge density wave (CDW) ground states. By substitu…
The early stages of crystallization are not fully understood, a particularly challenging problem being crystallization from solution. The processes involved at an atomic level remain elusive to experiment. Furthermore, crystallization from solution has been thought to be inaccessible by atomistic computer simulations.…
Particles of nanometer size (nanoparticles) supported on well-characterized oxide surfaces are of particular interest to model the high complexity of real catalysts to answer questions such as the role of intrinsic size effects and the influence of the support. 1,2 Model systems so far consisted of size-distributed na…
Synchrotron-based photoemission spectroscopy and low-energy electron diffraction were used to study the reaction of water vapor at 300 K and different water vapor pressures, p(H2O), ranging from 5×10−9 Torr to 10−3 Torr (3 min exposure at each pressure), with vacuum-cleaved MgO(100) surfaces that had low (5–10%) defec…
High-resolution NO3- profiles in freshwater sediment covered with benthic diatoms were obtained with a new microscale NO3- biosensor characterized by absence of interference from chemical species other than NO2- and N2O. Analysis of the microprofiles obtained indicated no nitrification during darkness, high rates of n…
The process of Ag colloid self-assembly onto organosilane-functionalized glass, carbon, and Au surfaces has been studied using UV−visible spectrophotometry, quartz crystal microgravimetry, and atomic force microscopy. Ag colloids prepared by citrate reduction and by ethylenediaminetetraacetic acid reduction of Ag + yi…
We show that the simplest model fluids in two and three dimensions, namely, the hard-disk and hard-sphere fluids, exhibit a structural precursor to the freezing transition, which manifests itself as a shoulder in the second peak of the radial distribution function. This feature is not present in the radial distributio…