Materials Literature
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A chiral cationic surfactant that can form vesicle-like assemblies in pure water and fibrous aggregates in mixtures of water and alcohols was synthesized. Silicas having helical mesoporous nanostructures were prepared from TEOS using the self-assemblies of this surfactant as templates in mixtures of water and alcohols…
Abstract The equilibrium structural parameters, high‐ and low‐frequency dielectric tensors, Born effective charges, and Γ‐point vibrational frequencies of bulk Al 2 O 3 corundum are calculated by using the periodic, ab initio program CRYSTAL, which adopts an all‐electron Gaussian‐type basis set. The effect of basis se…
A generic design principle based on the use of organometallic (Li or Mg) reagents for the substitution of the fluoro ligands in difluoroboradiazaindacene is described. A library of compounds bearing various substituents (butyl, phenyl, naphthyl, pyrenyl, ethynylnaphthyl, ethynylfluorenyl, ethynylcarbazoyl, ethynylpery…
Desorption of bound and unbound water molecules from the nanoporous coordination framework ErIII[CoIII(CN)6].4(H2O) to form the apohost, ErIII[CoIII(CN)6], proceeds via a single crystal to single crystal transformation in which the Er(III) cations change from 8- to 6-coordinate; dehydration results in a striking chang…
A new bisboronate with five six-membered ring heterobicycles was prepared by reaction of [2-(2-hydroxy-4-diethylaminobenzylidene)amino]-5-nitroaminophenol and 1,4-phenyldiboronic acid, and its quadratic nonlinear optical (NLO) response was compared to that of a related monoboronate species. A computational investigati…
A new approach to the evaluation of the accessibility of acid sites in microporous/mesoporous materials is developed and tested using a series of dealuminated mordenites. This approach is based on an IR-spectroscopic study of the consecutive adsorption of substituted alkylpyridines (pyridine, 2,4,6-trimethylpyridine,…
We have devised a novel route towards a nanoscopically striped surface pattern with long range order the self-assembly of an ABC triblock terpolymer thin film exposed to an in-plane electric field. the interplay between surface interactions and the effect of the electric field the lamellae were oriented both perpendic…
Layer-by-layer approaches to the fabrication of nanostructured polymer assemblies have contributed to the design of thin films and composites of interest in a variety of areas. Here, we highlight recent contributions from our laboratory toward the design of multilayered assemblies that erode controllably and predictab…
A detailed model of the diffraction of plane and Gaussian beams on plane uniform phase Bragg gratings based on Kogelnik's theory of coupled waves is presented. The model describes transmitting gratings with arbitrary orientation in a plane-parallel plate taking into account spectral width and angular divergence of las…
Ground state structures and energies are predicted for (MO2)n, where n = 1 to 8 and M is one of three isovalent cations, titanium(IV), zirconium(IV) and hafnium(IV), with the minimised binding energies calculated using Density Functional Theory. An increased number of single coordinated oxygen atoms, as opposed to mor…
Ordered mesoporous SiC with high specific surface area (650-800 m(2) g(-1)) and well ordered pore structure was obtained via nanocasting of polycarbosilanes into SBA-15 and subsequent conversion of the polymer at 1300 degrees C.
A novel combined organic and inorganic process for preparing thin supported membrane was developed, using which a thin and defect-free Pd membrane with uniform thickness of 5 microm was directly coated onto porous alpha-Al2O3 hollow fiber without any interlayer and substrate penetration; at the same time, there existe…
Amplification properties have been compared in Er(3+), Er(3+)/Eu(3+) and Er(3+)/Ce(3+) doped tellurite glass fibers using a 980 nm pumping scheme. The pump efficiency has been compared in the 3 types of fibers. Er(3+) ion upconversion in bulk glasses and fibers in visible range has been measured and the Er(3+) ion IR…
Using first-principles calculations, we simulate grain boundary decohesion (embrittlement) in ferromagnetic bcc FeΣ3(111)[1\\bar10] and fcc NiΣ5(012)[100] symmetrical tilt grain boundaries by progressively adding sulfur atoms to the boundaries. We calculate the segregation energy of sulfur atom, tensile strength, and…
We report a method for creating synthetic diatom frustules the biomimetic silicification of polyamine-rich scaffolds assembled by direct ink writing (DIW) [G. M. Gratson, M. Xu and J. A. Lewis, , 2004, , 386, ]. A concentrated polyamine-rich ink is robotically deposited in a complex 3D pattern that mimics the shape of…
We present the design for a hexagonal cell made of quasi-periodic dendritic arranged collections of plasmonic metallic wires that may exhibit a resonant magnetic collective response. When such quasi-periodic dendritic cells are etched on a host medium, they may provide metamaterials with negative effective permeabilit…
Abstract Supported metal particles play an important role in heterogeneous catalysis. It has been shown lately that the size of the metal crystallites in the supported metal catalysts has a profound effect on the catalytic activity, thus necessitating the need for synthesis methods aimed at a strict control of the met…
Gamma (gamma)-irradiation is finding increasing use in the sterilization of pharmaceutical products. However, irradiation also might affect the performance of drug delivery systems. In this study, the influence of gamma-irradiation on the characteristics of chitosan microparticles was investigated. The diclofenac sodi…
The interface between the polymer and the filler particles influences the properties of dielectric materials. To understand how interfaces act, they should be considered as layers rather than interfaces. Therefore the term interphase is more appropriate for the polymer layer around a filler particle where the polymer…
Samples of polyhydroxybutyrate (PHB), poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) containing 4–20% (mol/mol) 3-hydroxyhexanoate (3HHx) were characterized as potential components of blood-contact biomaterials. In an erythrocyte contact hemolysis assay,…