Materials Literature
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In situ synchrotron FTIR experiments have been performed during evaporation-induced self-assembly (EISA) of mesoporous films and the role of silica polycondensation in obtaining highly organized mesostructures has been illuminated.
OBJECTIVE: The use of transgenic and knockout mice has led to a need for a consistent model of mouse transient focal cerebral ischemia. In a great majority of the published mouse middle cerebral artery (MCA) occlusion studies, the methods indicated the type of intraluminal suture used without indicating the actual sut…
Isothermal crystal growth from evaporating fluxes of alkaline chlorides allowed the reproducible, high yield synthesis of micron thick and millimetre long whiskers of two manganese-rich phases, BaMn8O16 hollandite and Ba6Mn24O48 manganite, with a tunnel crystal structure. The crystal morphology suggests that they grow…
We report the preparation and magnetic properties of magnetite Fe 3 O 4 nanostructures grown by electrodeposition in the form of ( i ) nanocrystalline film (200 nm thick) and ( ii ) nanocylinders (50 nm diam, 200 nm long) inside the pores of polycarbonate membranes. According to x-ray diffraction and magnetic measurem…
Abstract This article analyzes the estimates of the cost of corrosion, made in various countries at various times. The data are extrapolated to a 2004 base and then projected to the global economy. The chronological order of the countries are the United States of America, the United Kingdom, Australia, Japan, Canada,…
To reach its most competitive long-term position, photovoltaics must push towards ever-increasing energy conversion efficiency while retaining low areal production costs. The most developed approach for improving this efficiency beyond that of a standard cell is to use a tandem stack of cells, with each cell in the st…
Dislocations influence many properties of crystalline solids, including plastic deformation, growth and dissolution, diffusion and the formation of polytypes. Some of these processes can be described using continuum methods but this approach fails when a description of the structure of the core is required. To progres…
Abstract Several key issues concerning surface‐enhanced Raman scattering (SERS) are discussed, especially the surface orientation of the adsorbate, the enhancement mechanism relevant in a particular experiment, and the dependence of SERS frequencies and intensities on the electrode potential. It is shown that ab initi…
This study represents a preliminary stage in the development of a process aimed at the selective uptake and release of metal ions from wastewater. The process involves the immobilisation of highly selective natural chelates secreted by bacteria or other living species inside mesoporous micelle-templated silicas (MTS)…
The copper(I) complexes of diphenylglycoluril basket receptors and , appended with bis(2-ethylpyridine)amine (PY2) and tris(2-methylpyridine)amine (TPA), respectively, and their dioxygen adducts were studied with low-temperature UV-vis and X-ray absorption spectroscopy (XAS). The copper(I) complex of, [.Cu(I)2] or, fo…
A carboxyl-containing conducting oligomer, poly(pyrenebutyric acid) (PPBA), has been synthesized for non-covalent sidewall functionalization of single-walled carbon nanotubes (SWNTs) by direct oxidation of α-pyrenebutyric acid (PBA) in boron trifluoride diethyl etherate (BFEE) containing SWNTs. The initial feeding wei…
Polycarbonate (PC)/acrylonitrile-butadiene-styrene (ABS) polymer alloy/montmorillonite (MMT) nanocomposites were prepared using a direct melt intercalation technique. The pyrolytic degradation and the thermo-oxidative degradation of the polymer alloy and the nanocomposites were studied by thermogravimetric analysis (T…
This paper describes the synthesis of Au–Ag bimetallic and Au–Ag–Hg trimetallic nanorods (NRs) from gold NRs, which acted as seeds, under alkaline conditions (pH ≥ 8.0) and in the presence of hexadecyltrimethylammonium bromide (CTAB), ascorbic acid, and other metal ions. The Hg2+, Fe3+, and Co2+ ions are stable at pH…
A catalyst preparative procedure is described that produces a high surface area alumina-supported palladium catalyst that yields an atypical chemisorbed carbon monoxide infrared spectrum. This inherently residue-free substrate provides a useful reference for evaluation of catalyst crystallite morphology and its effect…
Abstract The equilibrium geometries, electronic and vibrational properties, and static polarizability of B 24 , B , and B clusters are reported here. First‐principles calculations based on density functional theory predict the staggered double‐ring configuration to be the ground state for B 24 , B , and B , in contras…
This work is aimed at improving our knowledge of the Nb and Fe precipitation in the low α-temperature range as a function of Fe and Sn contents in ZrNb based alloys. Several experimental variants, with Nb contents ranging from 0.3–0.8 wt%, Fe from 0.01–0.5 wt% (and also Sn additions), have been studied, with special a…
Porous metals are useful as catalysts, biosensors, and as porous electrodes. We review here three new chemical methods for the preparation of macroporous gold. The article focuses on our new approach, which uses emulsion-templated polymers as scaffolds for the production of macroporous metals or other materials from n…
Analogues of chorismate and isochorismate were designed and tested as potential inhibitors in the first inhibition study against a salicylate synthase.
In this paper, we present a scheme for the development of Si–O, O–O and Au–O modified embedded atom method (MEAM) potential models which can be combined with previously developed Si–Si, Au–Si and Au–Au MEAM potential functions to describe the structural properties of the Au–silica interface as well as several importan…
We present a new texturing technique applicable to silicon solar cells. The technique is based on the isotropic etching of silicon through a very thin layer of silicon nitride, deposited by low-pressure chemical vapor deposition. Spectrophotometry measurements show that the resulting surface texture displays low refle…