Materials Literature
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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…
HSSP is a derived database merging structural (3-D) and sequence (1-D) information. For each protein of known 3-D structure from the Protein Data Bank (PDB), the database has a multiple sequence alignment of all available homologues and a sequence profile characteristic of the family. The list of homologues is the res…
The performance of a novel optical compensation film utilizing a negatively birefringent discotic compound was optimized by both simulation and experiment to achieve wide-viewing-angle characteristics of twisted-nematic liquid-crystal displays (TN-LCDs). It was shown that the film remarkably enlarges the viewing angle…
Asymmetric manganese salen epoxidation catalysts are assembled and trapped in a multistep synthesis in the cages of zeolite EMT; these heterogeneous catalysts produce high enantiomeric excess in the epoxidation of aromatic alkenes with NaOCl.
SummaryThe anodic oxidation of aluminium alloys is reviewed and discussed with reference to recent results of the authors on the anodizing of model binary aluminium alloys. Attention is given primarily to the oxidation of alloying elements at the alloy/film interface during the formation of barrier-type anodic films.…
Control of the electrical and optical properties of different polythiophene derivatives can be achieved, to some extent, by adjusting the nature of their substituents. The effects of flexible side chains (increase in solubility, modification of the stability of the conducting state, induction of thermo‐, iono‐, photo‐…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphogenesis of Biomineral and Morphosynthesis of Biomimetic FormsGeoffrey A. OzinView Author Information Materials Chemistry Research Group, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6 Cite this: Acc. Chem. Res. 19…