Materials Literature
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Cu(II) was used as a probe to investigate the structure and ion binding ability of full-generation poly(amidoamine) starburst dendrimers ( n SBDs). Computer-aided analysis of the EPR spectra provided information on the formation of copper complexes in various internal or external locations of the dendrimers, as well a…
The synthesis, characterization, and vis−NIR−IR vapochromic/spectroscopic studies are reported for isocyanide compounds of the form [Pt(arylisocyanide) 4 ][Pt(CN) 4 ] (where arylisocyanide = p -CNC 6 H 4 C n H 2 n +1; n = 1, 6, 10, 12, 14). The dark blue, solid materials change color in the NIR (near-infrared) spectra…
Polyaniline (PANI), one of the most interesting members of the group of conducting polymers, has been the subject of intense experimental and theoretical studies because of its outstanding behaviour during electrochemical redox processes and during changes of pH. In this work the electrochemical doping and protonation…
Thiol-derivatised nanoparticles of Au, Pt and Ag (diameter 1–10 nm) forming superstructures, are prepared by the acid-facilitated transfer of well characterized particles in a hydrosol to a toluene layer containing the thiol.
In the respiratory system, electron carriers such as ubiqui-none and cytochrome c play an important role in the electron transfer (ET) reaction between oxidoreductases embedded in the mitochondrial membrane. This review focuses on a strategy for constructing porphyrin–electron acceptor pairs via specific interactions…
Near-monodisperse, micrometre-sized poly(N-vinylpyrrolidone)-stabilized polystyrene latexes have been coated with polypyrrole by in situ deposition of the conducting polymer from aqueous solution. If the conducting polymer overlayer is sufficiently thin, it lies inside the steric stabilizer layer and the coated latexe…
The excellent field emission characteristics of carbon nanotube films , i.e., the property that the tips of the nanotubes emit electrons when placed in an electric field, are discussed in some detail. The experimental configurations used (see Figure) and the results obtained are reviewed. It is suggested that carbon n…
Photostructural change in amorphous selenium has been studied in situ by extended x-ray-absorption fine structure at 30 K. The essential features of the amorphous state are in agreement with the previous reports; the average bond length is shortened and the second-nearest-neighbor peak is smeared out, suggesting stren…
Partial recrystallization of the interporous aluminosilicate surface of MCM-41 and HMS by ion-exchanged tetrapropylammonium template results in a mesoporous material with surface-tectosilicate structures giving enhanced acidity and catalytic cracking activity.
The interface microstructure of the state‐of‐the‐art cathode material for solid oxide fuel cells, Sr x La 1 − x MnO 3 (SLM), was investigated with respect to its electrochemical performance. The interface microstructure was characterized by grain size and coverage of SLM on the electrolyte surface. Variation of the gr…
The low potential, redox‐active, highly stable conducting polymer PEDOT (poly(3,4‐ethylenedioxythiophene)) has received much attention recently because of these properties, which are likely to lead to many applications. Here the synthesis of EDOT‐TMS 2 is reported (where TMS stands for trimethylsilyl and Bi indicates…
Yttria‐stabilized‐zirconia samples with fairly narrow pore size distributions give well‐defined microstructure impedance semicircles which can be characterized by a blocking factor α R , a capacitance ratio α C and a frequency ratio α F . On an α R vs . α C diagram, the regimes where either the pores or the grain boun…
Gold exhibits very high catalytic activities, comparable with that of a conventional Cu/ZnO/Al 2 O 3 catalyst, for forward and reverse water–gas shift reactions when supported on titanium oxide by the deposition–precipitation method.
Abstract The behavior of clays in soils, groundwater aquifers, and aquatic environments is controlled to a large extent by flocculation and dispersion phenomena. Dispersed clay particles can become mobile and facilitate the translocation of strongly sorbed pollutants in the environment. In this study, the adsorption o…
a-C:H films prepared by DC-magnetron sputtering in an H/sub 2/:Ar mixture exhibit strong photoluminescence (PL) peaks superimposed upon the Raman scattering spectrum. PL becomes observable at a hydrogen content of ca. 34%, and increases exponentially thereafter, driven by the progressive saturation of carbon dangling…
Ruthenium(II) meso-tetrakis(4-chlorophenyl)porphyrinencapsulated in MCM-41 modified with 3-aminopropyltriethoxysilane is a stable catalyst for alkene oxidation by tert-butyl hydroperoxide with high product turnovers.
Abstract This paper presents routines to compute the Mott cross section used in the CASINO program (Monte CArlo SImulation of electroN trajectory in sOlid). The routines used tabulated values of the Mott cross section computed in the work of Czyzewski et al . (1990). The cross section is available over the range 0.02…
A post-synthesis route, through which various metal elements can be grafted onto siliceous frameworks using non-aqueous solutions of AlCl3, Al(NO3)3, SnCl2, Zn(O2CMe)2 Mn(O2CMe)2, etc., is developed as a generalised means to obtain mesoporous metallosilicates molecular sieves with various structures such as MCM-41 (he…
Free access1 January 1997 Share on O-Acetyltransferases for chloramphenicol and other natural productsAuthors: I A Murray, W V ShawAuthors Info & AffiliationsDOI: https://doi.org/10.1128/AAC.41.1.1 PDF/EPUB
Free-standing block copolymer films containing magnetic iron oxide nanoclusters within the microdomains were produced by static casting. The thickness of the nanocomposite films was easily controlled to make optically transparent thin films. The size distribution of the nanoclusters was relatively narrow and the nanoc…