Materials Literature
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The complex dielectric functions, ε ( E )= ε 1 ( E )+ i ε 2 ( E ), of ZnO have been measured by spectroscopic ellipsometry (SE) in the photon-energy range between 1.5 and 5.0 eV at room temperature. The SE measurements are carried out on the surface parallel to the optic axis c , which allows the determination of the…
We review the present state of understanding of the structure, growth and properties of nanometre-size tubes of carbon. Two different types of carbon nanotubes, namely single-shell nanotubes made of single layers of graphene cylinders and multishell nanotubes made of concentric cylinders of graphene layers have now be…
The kinetics of solid state reactions generally cannot be assumed to follow simple rate laws that are applicable to gas-phase reactions. Nevertheless, a widely practiced method for extracting Arrhenius parameters from thermal analysis experiments involves force fitting of experimental data to simple reaction-order kin…
The electrical conductivity, sigma, of donor‐doped and undoped strontium titanate (SrTiO 3 ) ceramics and, in some cases, single crystals, Sr1‐xLaxTiO 3 (0 ≤ to x ≤ 0.1), was investigated in the temperature range of 1000°‐1400°C under oxygen partial pressures, PO 2 , of 10 ‐20 ‐1 bar. In conjunction with Hall data and…
The observation that the nematode cell death effector gene product Ced-3 is homologous to human interleukin-1beta-converting enzyme (caspase-1) has led to the discovery of at least nine other human caspases, many of which are implicated as mediators of apoptosis. Significant interest has been given to aspects of the c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExpanded Porphyrins and Their HeterologsAyub Jasat and David DolphinView Author Information Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, B.C., Canada V6T 1Z1 Cite this: Chem. Rev. 1997, 97, 6, 2267–2340Publication Date (Web):October 1,…
Five massive gold-cluster molecules have been isolated in high yield and have undergone separate structural characterization, and their electronic structure has been deduced by optical absorption spectroscopy. These new molecules are distinguished by a crystalline (or quasicrystalline) core of densely packed Au atoms,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTShape-Persistent Molecular Architectures of Nanoscale DimensionJeffrey S. MooreView Author Information Departments of Chemistry and Materials Science & Engineering and The Beckman Institute for Advanced Science and Technology, University of Illinois, Urbana, Illinois 61801 C…
Antimicrobial film was extruded using LDPE resins and potassium sorbate powder; its tensile properties, transparency and antimicrobial activity were measured to examine the adaptability as a packaging material. The tensile properties were not affected significantly by the incorporation of potassium sorbate to 3% (w/w)…
The evolution of the structural properties of ${A}_{1\ensuremath{-}x}{A}_{x}^{\ensuremath{'}}{\mathrm{MnO}}_{3}$ was determined as a function of temperature, average $A$-site radius $〈{r}_{A}〉,$ and applied pressure for the ``optimal'' doping range $x=0.25,$ 0.30, by using high-resolution neutron powder diffraction. T…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemical Control in Organic Synthesis Using Silicon-Containing CompoundsIan Fleming, Asuncion Barbero, and David WalterView Author Information Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, England Cite this: Chem. Rev. 1997, 97, 6…
Following an overview of the primitive state of mechanistic studies of the formation of nanoclusters, with a focus on LaMer's classic work on the formation of sulfur sols, kinetic and mechanistic studies of the formation of our recently reported novel P 2 W 15 Nb 3 O 62 9 - polyoxoanion- and Bu 4 N + - stabilized Ir ∼…
A new formulation of the Fourier modal method (FMM) that applies the correct rules of Fourier factorization for crossed surface-relief gratings is presented. The new formulation adopts a general nonrectangular Cartesian coordinate system, which gives the FMM greater generality and in some cases the ability to save com…
Polypropylene (PP)−clay hybrids (PPCH) have been prepared by simple melt-mixing of three components, i.e., PP, maleic anhydride modified polypropylene oligomers (PP-MA), and clays intercalated with stearylammonium. The dispersibility of 10-Å-thick silicate layers of the clays in the hybrids was investigated by using a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFrom Microporous to Mesoporous Molecular Sieve Materials and Their Use in CatalysisAvelino CormaView Author Information Instituto de Tecnología Química, UPV-CSIC, Universidad Politécnica de Valencia, Avda. de los Naranjos s/n, 46022 Valencia, SpainCite this: Chem. Rev. 1997,…
Computer Program Abstracts The category Computer Program Abstracts provides a rapid means of communicating up-to-date information concerning both new programs or systems and significant updates to existing ones. Following normal submission, a Computer Program Abstract will be reviewed by one or two members of the IUCr…
This article deals with the characterization of the structural changes induced by uniaxial extension in the amorphous phase of an ethylene/butene copolymer. Volume change measurements indicate a reversible densification relevant to a strain-induced organization in the amorphous phase. The dynamic mechanical behavior s…
The fundamental results of the Coupling Model, i.e . crossover from independent relaxation at short-times to slowed down cooperative relaxation at a temperature independent time t c, are represented by three equations. They are shown to be in accord with experimental data in molecular glass formers, glass-forming, gla…
Poly(OxyMethylene) (POM) and its miscible blends were studied by multifrequency A.C. dielectric and thermally stimulated currents (TSC). The blends contained small amounts of either poly(vinyl phenol), which is a high glass transition (Tg) diluent, or a styrene-co-hydroxy styrene oligomeric low Tg diluent. The variati…
We describe an original QSPR model called the EVM model (Energy, Volume, Mass) to calculate the glass transition temperature (Tg) of aliphatic acrylate and methacrylate homopolymers using classical molecular mechanics and dynamics. The latter was used to calculate an energy density function related to the cylindrical…