Materials Literature
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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…
Some Acetobacter strains produce a cellulose called bacterial cellulose in culture medium. This cellulose has unique structural and mechanical properties compared with higher plant cellulose, and is expected to be a commodity material in various fields of industry. For economical mass production, it is essential to co…
The rational modification of porous and single‐crystalline silico surfaces is of particular interest for technologies based on silicon. Porous silicon, such as the layer shown in the Figure, has many potential technological applications. In this review of chemical reactions developed for Si surface modification, both…
We evaluate thermodynamic, structural, and transport properties from extensive molecular-dynamics computer simulations of the ST2 and TIP4P models of liquid water over a wide range of thermodynamic states. We find a line in the phase diagram along which the isothermal compressibility of the supercooled liquid is a max…
Self-assembly of silver sulfide, Ag 2 S, nanoparticles is reported for different particles sizes. Monolayers of particles organized in a hexagonal network are formed over very large domains. Small or large aggregates can also be produced. The observations indicate that the formation of self-assemblies of nanoparticles…
Metallophthalocyanine thin films, obtained by vacuum deposition as highly ordered, uniquely oriented films (the Figure shows an iron phthalocyanine film deposited at 200°C), have been sued to fabricated organic field‐effect transistors (FETs). It is demonstrated that the substrate temperature during deposition greatly…
Negatively charged amino acids (aspartic acid, glutamic acid) and a related polymer, poly(α,β-aspartate), have been intercalated within the gallery spaces of layered double hydroxides. Synthesis of these bioinorganic nanocomposites was achieved via co-precipitation involving simultaneous formation of the inorganic lay…
Temperature-dependent neutron diffraction studies on melt-grown crystals of the layered compound ${\mathrm{La}}_{1.2}$${\mathrm{Sr}}_{1.8}$${\mathrm{Mn}}_{2}$${\mathrm{O}}_{7}$ reveal a dramatic structural response to the onset of ferromagnetism and the coincident insulator-metal transition. Unlike the related mangani…
The measurement of current and voltage fluctuations on the same electrochemical cell allows the evaluation of a quantity R n known as noise resistance, which has been proposed as an indication of the corrosion resistance of the material under study. The theoretical basis for the relationship between R n and the electr…