Materials Literature
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Membranes were prepared from chitosan with different molecular weights by a casting method. The molecular affinity and permeability of the membranes for sodium chloride, glucose, tyrosine, and bovine serum protein were measured at 4 degrees C and pH 7. The molecular permeability of the chitosan membranes was inversely…
We present a calculation of a fourth-order, time-dependent density correlation function that measures higher-order spatiotemporal correlations of the density of a liquid. From molecular dynamics simulations of a glass-forming Lennard-Jones liquid, we find that the characteristic length scale of this function has a max…
Simulations of realistically dense polymer melts filled with randomly distributed solid nanoparticles and calculations performed with various methods for single chains in the presence of filler do not show the large increase of chain dimensions with respect to the unfilled polymer predicted by previous RIS calculation…
This work aims to use the Palierne emulsion type model to describe the relationship between the rheological response to small amplitude oscillatory deformation and morphology of polypropylene/polyamide 6 (PP/PA6) blends compatibilized with maleic anhydride grafted polypropylene (PP- g -MAH). It was found that the Pali…
The reactions of the Mn(III)(3) and Mn(II)Mn(III)(2) complexes [Mn(3)O(O(2)CEt)(6)(py)(3)][ClO(4)] and [Mn(3)O(O(2)CEt)(6)(py)(3)] with pyridine-2,6-dimethanol (pdmH(2)) afford the mixed-valence Mn(II)(6)Mn(III)(2) octanuclear complex [Mn(8)O(2)(py)(4)(O(2)CEt)(8)(L)(2)][ClO(4)](2) (1) and the Mn(II)(7)Mn(III)(2) enne…
This article describes for the first time the direct observation of the nucleation and growth process of CdS nanowires in a typical vapor−solid synthetic route. Thermal evaporating of CdS nanosized powders at 1173 K for various time durations corresponds to different growth stages and leads to varied product morpholog…
The amplified quenching of an anionic conjugated polymer, sulfonated poly(phenylene ethynylene) (PPE-SO 3 - ), by a cationic quencher comprising a boronic acid functionalized benzyl viologen ( p -BV 2+ ), has been used to optically detect sugars. In the absence of sugar, a strong polymer/quencher interaction leads to…
A reconstruction technique based on the solution of the Radon transform in terms of Jacobi polynomials is used to obtain the 3D electron momentum density rho(p) from nine high-resolution Compton profiles (CPs) for a Cu0.9Al0.1 disordered alloy single crystal. The method was also applied to theoretical CPs computed wit…
We report the values of some thermal and electrical properties of Candelilla Wax (euphorbia cerifera). The open-cell photoacoustic technique and another photothermic technique - based on the measure of the temperature decay of a heated sample - were employed to obtain the thermal diffusivity ($α_{s} = 0.026 \pm 0.0009…
Measurements of magnetic hysteresis loops in Cu-Al-Mn alloys of different Mn content at low temperatures are presented. The loops are smooth and continuous above a certain temperature, but exhibit a magnetization discontinuity below that temperature. Scaling analysis suggest that this system displays a disorder induce…
We study the Mott insulating phase of the one-dimensional Hubbard model using a local-density approximation (LDA) that is based on the Bethe Ansatz (BA). Unlike conventional functionals, the BA-LDA has an explicit derivative discontinuity. We demonstrate that as a consequence of this discontinuity the BA-LDA yields th…
This paper describes a method, discovered and refined by parallel screening, for the epoxidation of alkenes. It uses hydrogen peroxide as the terminal oxidant, is promoted by catalytic amounts (1.0-0.1 mol %) of manganese(2+) salts, and must be performed using at least catalytic amounts of bicarbonate buffer. Peroxymo…
Tube-shaped nanostructures (nanotubes) have a number of attributes that make them potentially useful for biomedical applications such as drug delivery/detoxification and enzyme immobilization. Template synthesis provides a route for preparing monodisperse nanotubes of nearly any size and composed of nearly any materia…
Surface modification of nanocrystalline metal oxide particles with enediol ligands was found to result in altered optical properties of nanoparticles. The surface modification results in a red shift of the semiconductor absorption compared to unmodified nanocrystallites. The optical shift is correlated to the dipole m…
A variety of novel hierarchical nanostructures with 6-, 4-, and 2-fold symmetries have been successfully grown by a vapor transport and condensation technique. It was found that the major core nanowires are single-crystal In 2 O 3 with 6, 4, and 2 facets, and the secondary nanorods are single-crystal hexagonal ZnO and…
Abstract The synthesis and characterization of some novel cationic siloxanes copolymers containing quaternary ammonium salt (QAS) groups in the backbone is reported in this article. One cationic oligomer having QAS in the backbone and reactive groups like 2,3‐epoxypropyl and 2‐hydroxy‐3‐chloropropyl (RCO) as well as 1…
We demonstrate an approach to connect nanowires consisting of ligand-stabilized Au 55 clusters with metal arrays prepared by using metal evaporation through a mask of monodispersed latex beads. The metal arrays serve as a model for micro- or nanoelectrodes, depending on the size of the beads. The silicon surfaces bear…
Dynamic manipulation of droplets could be achieved by light in a nematic liquid crystal (LC) doped with photochromic azobenzene derivatives. On irradiation of ultraviolet light, the trans→cis photoisomerization drives a directional motion of the droplets towards the cis-rich region and assembled close-packed two-dimen…
Intergrowth Bi4Ti3O12–PbBi4Ti4O15 single crystals were grown, and their dielectric and ferroelectric anisotropy were investigated along the a and c axes. Dielectric measurements revealed that the Curie temperature was 550 °C, which was lower than that of Bi4Ti3O12 (675 °C) and PbBi4Ti4O15 (570 °C). Remanent polarizati…
The optical properties of SrAlF 5 :Pr 3 + are studied. Emission measurements up to 1200 nm under blue-light excitation in the 3 P 2 level reveal a large number of emissions all originating from the 3 P 0 level and the 1 D 2 level. Under vacuum ultraviolet excitation in the 4f 1 5d 1 bands, emission from the 1 S 0 leve…