Materials Literature
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The alignment kinetics of the orientation/reorientation behavior of the microphase of a lamellarPS- b -PI diblock copolymer under large-amplitude oscillatory shear conditions is studied. By online monitoring the degree of the mechanical nonlinearity during the orientation process as determined via the higher harmonics…
Admicellar polymerizations were conducted in aqueous solutions to form electrically conducting poly(pyrrole) (PPy) ultrathin films on mica and graphite. Separate solutions were used for monomer adsolubilization and polymerization, so that at the start of the reaction step, the only monomer in solution was localized at…
Increasing the net fixed-charge density in multilayer polyelectrolyte membranes using postdeposition reactions results in large enhancements of ion-transport selectivity. To control the fixed-charge density in poly(acrylic acid)/poly(allylamine hydrochloride) (PAA/PAH) films, we partially derivatized PAA using 2-nitro…
Calorimetric and X-ray diffraction investigations of anhydrous α trehalose obtained by dehydration of its dihydrate form have been performed. The results show that the structural and thermodynamic properties of the dehydrated state strongly depend on the kinetics of water loss. A fast dehydration promotes the formatio…
The formation of CuS nanoparticles from Cu(NO 3 ) 2 and Na 2 S by the mixing of two separate water-in-carbon dioxide (W/C) microemulsions supported by the sodium salt of bis(2,2,3,3,4,4,5,5-octafluoro-1-pentyl)-2-sulfosuccinate (di-HCF4) was investigated. At a water-to-surfactant ratio of 10 and a copper concentration…
Straight acrylic composite nanoparticles with a mean diameter of 132 nm and a mushroomlike particle morphology consisting of a soft poly( n -butyl acrylate) phase with a caplike poly(methyl methacrylate) hard phase covering one side of the particle were prepared by emulsion polymerization. The particles show oriented…
The effect of entanglements on deformation properties of end-linked networks was investigated using Monte Carlo simulations. Model tetrafunctional networks were prepared by cross-linking precursor monodisperse chains in the framework of the bond fluctuation model (BFM). The degree of entanglement in these networks was…
Carbon nanoprobes were utilized in tapping mode atomic force microscopy investigations to highlight the topographic differences between poly(amidoamine) (PAMAM) dendrimers, two-dimensional arrays of PAMAM dendrimers, and PAMAM core−shell tecto(dendrimers). The PAMAM core−shell tecto(dendrimers) used for this study con…
Alternating deposition of oppositely charged polyelectrolytes on porous supports is an attractive way to synthesize selective, ultrathin ion-separation membranes. This study reports the use of Cu 2+ as a template in poly(acrylic acid) (PAA)/poly(allylamine hydrochloride) (PAH) membranes to control fixed charge density…
We present results of first-principles density functional calculations for the candidate multiferroic magnetoelectric, bismuth chromite. Although little is known experimentally about BiCrO 3, its chemical neighbors BiMnO 3 and BiFeO 3 are known to be ferromagnetic and ferroelectric respectively, with structural distor…
The phase behavior of a melt of monodisperse rod−coil diblocks is studied. We derive a Landau free energy functional for both a compositional and a nematic order parameter. The excluded volume interaction between the rod blocks is modeled by an attractive Maier−Saupe interaction. The incompatibility between rod and co…
In this report, a novel method for the synthesis of gold nanoparticles on an amorphous silica support is described wherein silanol groups on the surface of the fumed silica spontaneously reduce aqueous chloroaurate ions. This results in the formation of gold nanoparticles that are bound fairly strongly to the fumed si…
Surface modifying macromolecules (SMM) were synthesized and blended into the casting solution of poly(ether sulfone). The solution was cast to films with thickness of 0.12 and 0.24 mm. The cast films were placed in an oven with forced air circulation for periods of 3, 5, 7, and 2000 min to remove the solvent, before b…
We have calculated the maximally-localized Wannier functions of MnO in its antiferromagnetic (AFM) rhombohedral unit cell, which contains two formula units. Electron Bloch functions are obtained with the linearized augmented plane-wave method within both the LSD and the LSD+U schemes. The thirteen uppermost occupied s…
Rotated ripple structures (RRS) on sputter eroded surfaces are potential candidates for nanoscale wire fabrication. We show that the necessary condition for RRS formation is that the width of the collision cascade in the longitudinal direction has to be larger than that in the transverse direction, which can be achiev…
Using molecular dynamics simulations, we study dynamics of a model polymer melt composed of short chains with bead number N=10 in supercooled states. In quiescent conditions, the stress relaxation function $G(t)$ is calculated, which exhibits a stretched exponential relaxation on the time scale of the $α$ relaxation t…
Biodegradable aliphatic polyesters (BAPs), synthesized from diols and dicarboxylic acids, and organophilic montmorillonite (OMMT) were intercalated by a solvent-casting method using chloroform as a cosolvent to produce nanocomposite (BAP/OMMT). The d spacings of both BAP and BAP/OMMT were examined by X-ray diffraction…
New polylactide (PLA)/layered silicate nanocomposites have been prepared successfully by simple melt extrusion of PLA and organically modified montmorillonite. The d spacings of both the organically modified montmorillonite and intercalated nanocomposites were investigated by wide-angle X-ray diffraction (WAXD) analys…
The nucleation and growth of colloidal CdSe nanocrystals with a variety of elongated shapes were explored in detail. The critical size nuclei for the system were magic sized nanoclusters, which possessed a sharp and dominated absorption peak at 349 nm. The formation of the unique magic sized nuclei in a broad monomer…
Abstract Irradiation of aluminium covered by anodic oxide films 3–14 nm thick using 100 keV H + ions is shown to result in detachment of the oxide film. A dose of 6.6 × 10 16 H + ions cm −2 on a 6.5 nm thick film causes the removal of large pieces of oxide with dimensions at least 15 µm. Atomic force microscopy analys…