Materials Literature
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Computer-based group-theoretical methods are used to enumerate structures arising in A(2)BB'X(6) perovskites, with either rock-salt or checkerboard ordering of the B and B' cations, under the additional assumption that one of these two cations is Jahn-Teller active and thereby induces a distortion of the BX(6) (or B'X…
An ethanol-thermal process was developed for in situ formation of dense and uniformly distributed Fe3O4 nanoparticles on the surfaces of multi-walled boron nitride nanotubes (BNNTs). The morphology, structures and compositions of the synthesized nanocomposites were characterized by X-ray diffraction (XRD), scanning tr…
Abstract The present study presents a novel method for preparing multi‐walled carbon nanotubes (MWCNTs) grafted with polyacrylicnitrile (PAN) through the process of plasma‐induced grafting polymerization. After the plasma grafting process, the MWCNTs were converted into acrylicnitrile modified CNTs (MWCNTs‐ g ‐AN), wh…
The early stages of crystallization of tetrahedral systems remain largely unknown, due to experimental limitations in spatial and temporal resolutions. Computer simulations, when combined with advanced sampling techniques, can provide valuable details about nucleation at the atomistic level. Here we describe a computa…
Hard x-ray photoelectron spectroscopy (HAXPES) is a new variant of the well-established photoemission technique, which extends its range to much higher photoelectron energies up to 10 keV and thus to enhanced probing depths of the order of 10 nm and beyond. This not only facilitates direct access to the intrinsic bulk…
We present a detailed investigation of the specific heat $(0.35<T<270\text{ }\text{K})$ and ordinary Hall effect (300 K) in ${\text{La}}_{1\ensuremath{-}x}{\text{Sr}}_{x}{\text{CoO}}_{3}$ single crystals at 11 doping values in the range $0.00<x<0.30$. The data reveal a considerable amount of information on…
Inspired by the biological cell structure, a novel and facile method for preparing organic–inorganic composite microcapsules is developed by a synergy of layer-by-layer (LBL) self-assembly and biomimetic mineralization. The LBL microcapsule is fabricated by the alternative assembly of a negatively charged polyelectrol…
Abstract The reaction between two non‐conducting chemicals, aniline and silver nitrate, yields a composite of two conducting components, polyaniline and metallic silver. Such conducting polymer composites combine the electrical properties of metals and the materials properties of polymers. In the present study, anilin…
On approaching the glass transition, the microscopic kinetic unit spends increasing time rattling in the cage of the first neighbors, whereas its average escape time, the structural relaxation time tau(alpha), increases from a few picoseconds up to thousands of seconds. A thorough study of the correlation between tau(…
Spectroscopic, structural, and computational studies of verdazyl radical-ruthenium complexes reveal the verdazyl to be a redox-active and non-innocent ligand. The ensuing delocalization of charge is highly sensitive to the nature of the beta-diketonate co-ligands.
Highly ordered microporous films containing polyolefin segment were successfully fabricated via the breath-figure (BF) method using well-defined polymethylene-b-polystyrene (PM-b-PS) diblock copolymers in CS2 under a static humid condition. The effects of molecular weight of diblock copolymers, relative humid, fabrica…
In situ, temperature dependent, XAFS proved that Cr(II) grafted on SiO(2) is extracted from the surface upon CO adsorption at 100 K: DeltaR(Cr-O) = +0.08 A. CO adsorption evolves into two coverage dependent steps: (i) displacement of weak siloxane ligands (non-classical carbonyls); (ii) relaxation of R(Cr-O) surface b…
The bialkali borohydride LiK(BH 4 ) 2 has a total H 2 content of 10.65 wt % and has been suggested as a potential candidate for hydrogen storage applications. We report first-principles calculations of the structure and reaction thermodynamics of LiK(BH 4 ) 2 . We have also examined KBH 4 and its structural analog NaB…
We investigate the relationships between structure and linear viscoelasticity of a model polymer nanocomposite system based on a mixture of fumed silica nanoparticles and polystyrene. Alterations in the viscoelastic behavior are attributed to the structuring of primary silica aggregates. Above a critical filler volume…
Nanoparticles that self-assemble on a liquid-liquid interface serve as the building block for making heterodimeric nanostructures. Specifically, hollow iron oxide nanoparticles within hexane form colloidosomes in the aqueous solution of silver nitrate, and iron oxide exposed to the aqueous phase catalyzes the reductio…
The effect of water on the reaction of 3-aminopropyltriethoxysilane (APTES) with mesoporous silica is investigated on two model systems. A MCM-41-type material with a well-defined pore size is used to investigate changes in the pore size distribution upon reaction with APTES in toluene containing various amounts of wa…
What do nanoparticles offer drug delivery to the eye that traditional formulations do not? The underlying concept of nanomedicine is that the nanomaterials have properties that their constituent components do not have. These unique properties are the benefit, but the cost can be more a complicated toxicology assessmen…
We use the finite difference time domain method to predict how optical plasmon properties are modified if the symmetrical geometry of gold shell nanostructures is broken. The simulations include three kinds of gold open shell nanostructures of nanobowls, open nanocages, and open eggshells. For all structures, the opti…
Alternating current (AC) nanocalorimetry was used to measure the reversing heat capacity C p of low-energy indomethacin glasses as they isothermally transform into the supercooled liquid. As the film thickness increases from 75 to 600 nm, the transformation time increases by more than an order of magnitude, consistent…
The glancing angle deposition (GLAD) technique is used to fabricate nanostructured thin films with high surface area. Quantifying this property is important for optimizing GLAD-based device performance. Our group has used high-sensitivity krypton gas adsorption and the complementary technique of cyclic voltammetry to…