Materials Literature
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Hollow polyelectrolyte microcapsules made of poly(allylamine hydrochloride) and sodium poly(styrene sulfonate), templated on various cores, manganese and calcium carbonate particles or polystyrene latexes, were investigated. The polyelectrolyte multilayers respond to a change of pH, leading to a swelling of the capsul…
Nanocomposites of polyaniline (PANI)–titanium dioxide (PANI–TiO 2 ) are prepared from a colloidal sol of TiO 2 nanoparticles. The dc and ac conductivities of samples with different concentrations of PANI have been investigated as a function of frequency and temperature. The dc conductivity follows three-dimensional va…
Membrane transport plays a leading role in a wide spectrum of cellular and subcellular pathways, including multidrug resistance (MDR), cellular signaling, and cell-cell communication. Pseudomonas aeruginosa is renowned for its intriguing membrane transport mechanisms, such as the interplay of membrane permeability and…
We calculated the free energy profiles of water and three metal ions (magnesium, calcium, and strontium) adsorbing on the [1014] calcite surface in aqueous solution. The approach uses molecular dynamics with parametrized equations to describe the interatomic forces. The potential model is able to reproduce the interac…
The mechanism of surfactant-assisted dispersion of single-walled carbon nanotubes in water is studied by small-angle neutron scattering. The previously hypothesized formation of cylindrical micelles with the nanotubes forming the core of cylinders is inconsistent with the data presented. The scattering data favor a ra…
Molecular simulations are performed to study the self-assembly of particles with discrete, attractive interaction sites - "patches" - at prescribed locations on the particle surface. Chains, sheets, rings, icosahedra, square pyramids, tetrahedra, and twisted and staircase structures are obtained through suitable desig…
Abstract For Abstract see ChemInform Abstract in Full Text.
The worldwide production capacity for all elastomers is around 17,500 kilotons per year (kt/yr) and is split between natural rubber and synthetic elastomers (1). Historically, the split has ranged from 40% to 50% natural rubber, though the level of natural rubber being used has been decreasing due to the emergence of…
Abstract For Abstract see ChemInform Abstract in Full Text.
Amorphous-Si:H∕SiO2 multilayers were layer-by-layer deposited and in situ plasma oxidized by a plasma-enhanced chemical vapor deposition system. Blue photoluminescence at room temperature was observed from as-fabricated samples without annealing. By controlling the thickness of the amorphous-Si:H sublayer from 4 to 1.…
Embedded in a flux of dehydrated B2O3, melts of pure germanium were undercooled by repeated melting and solidification of the specimens within a differential scanning calorimeter facility. The highest undercooling obtained in this way was 190K. The specific heat of the undercooled melt was measured by calorimetric dia…
Abstract Summary: We show that small quantities of dibenzylidene sorbitol dispersed in poly( ε ‐caprolactone) provide a self‐assembling nanoscale framework to yield high levels of crystal orientation. During modest shear flow of the melt, the additive forms highly extended nanoparticles which adopt a preferred alignme…
The correlation between the temperature dependence of the kinetic and thermodynamic properties of a series of metallic glass-forming liquids is investigated using the concept of fragility. The results indicate a correlation between the kinetic fragility and thermodynamic fragility in these liquids. The correlation dep…
Electron-transfer quenching of tris(2,2-bipyridine)ruthenium(II) by methylviologen in an aqueous suspension of clay in the presence of poly(vinylpyrrolidone) was investigated. The quenching behavior of the excited tris(2,2-bipyridine)ruthenium(II) on clay by the coadsorbed methylviologen indicated the homogeneous dist…
Applying the dynamical coherent potential approximation to a simple model, we have theoretically studied the behavior of the optical band edge in diluted magnetic semiconductors (DMS). For ${A}_{1\ensuremath{-}x}^{II}{\mathrm{Mn}}_{x}{B}^{VI}$-type DMS, the present study reveals that the linear relationship between sp…
We examine a simple one-dimensional (1D) model of dislocation activity, including a stress-activated source and mutually interacting dislocations. We demonstrate, through numerical and analytical steps, that the dislocations emitted from a 1D stress-activated source evolve towards a distribution which is self-similar…
Pure aluminium containing about 200 at.ppm Fe in solution is shown to creep about 106 times slower at 200°C than the same aluminium containing a negligible amount of iron in solution. The high creep resistance of the Al–200 at.ppm Fe alloy is attributed to the presence of subgrain boundaries containing iron solute ato…
We present first-principles transport calculations for bismuth utilizing the linearized-augmented plane-wave method. From the calculated transport distribution, we compute transport coefficients and our results agree well with experiment. Furthermore, we derive the power factor and find two pronounced maxima excelling…
A novel Cu(II)-Mn(II) hexanuclear complex of formula [[MnCuL](3)(tma)](ClO(4))(3).8H(2)O [H(2)L = macrocyclic Robson proligand; H(3)tma = trimesic acid] has been obtained by connecting three heterobinuclear [Cu(II)Mn(II)L](2+) cationic species through the trimesate anion. The complex exhibits a C(3) rotational symmetr…
${\mathrm{Mn}}_{5}$ and ${\mathrm{Mn}}_{6}$ clusters have recently been found to exhibit Stern-Gerlach profiles marked by a central peak that broadens with the increasing field gradient. The profiles neither exhibit a reminiscence of space quantization as observed through a splitting of beams for the case of free atom…