Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of thiazole rings to enhance molecular second-order nonlinear optical susceptibilitiesC. W. Dirk, H. E. Katz, M. L. Schilling, and L. A. KingCite this: Chem. Mater. 1990, 2, 6, 700–705Publication Date (Print):November 1, 1990Publication History Published online1 May 2002…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer-supported poly(amino acids) as new asymmetric epoxidation catalyst of .alpha.,.beta.-unsaturated ketonesShinichi Itsuno, Minako Sakakura, and Koichi ItoCite this: J. Org. Chem. 1990, 55, 24, 6047–6049Publication Date (Print):November 1, 1990Publication History Publis…
A model is proposed to relate segregation of dopants with the development of fine ceramic microstructures and electrical properties in polycrystalline donor‐doped BaTiO 3 . As the average dopant concentration is increased, the dopant concentration at the grain boundary increases compared with the bulk. This has two im…
Precipitation causes changes in the modes of plastic deformation and recrystallisation, as well as in the development of rolling and recrystallisation textures. The nature of these changes varies strongly with the size, shape, and density of the particles and, in particular, on whether the particles are cut by disloca…
Whereas xenogeneic collagen has provided a safe and effective biomaterial for numerous medical applications, there are few instances in which data permit the correlation of the immunologic profile of well-defined devices with their clinical sequelae. A major exception is the use of injectable bovine dermal collagen fo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescent and redox-reactive building blocks for the design of photochemical molecular devices: mono-, di-, tri-, and tetranuclear ruthenium(II) polypyridine complexesGianfranco Denti, Sebastiano Campagna, Luigina Sabatino, Scolastica Serroni, Mauro Ciano, and Vincenzo Bal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotophysical investigation of starburst dendrimers and their interactions with anionic and cationic surfactantsGabriella Caminati, Nicholas J. Turro, and Donald A. TomaliaCite this: J. Am. Chem. Soc. 1990, 112, 23, 8515–8522Publication Date (Print):November 1, 1990Publicati…
We compare specific-heat-spectroscopy and dielectric susceptibility measurements of salol (phenyl salicylate) near the glass transition. The specific-heat-spectroscopy measurements cover 5 decades in frequency; the dielectric susceptibility measurements cover 13 decades. Over their common range, both probes measure th…
The evolution of the cold deformation microstructure is described for medium to high stacking fault energy, single phase fcc metals. Macroscopic strain accommodation for polycrystalline metals is considered, and it is suggested that grains subdivide during deformation on a smaller and smaller scale, and that each volu…
The first‐principles orthogonalized linear combination of atomic orbitals (OLCAO) method for electronic structure studies has been applied to a variety of complex inorganic crystals. The theory and the practice of the OLCAO method in the local density approximation are discussed in detail. Recent progress in the study…
X-ray structures of the peripherally crowded porphyrins, (2,3,7,8,12,13,17,18-octaethyl-5,10,15,20-tetraphenylporphinato) Zn(II)-3MeOH solvate (ZnOETPP·3MeOH) and (2,3,7,8,12,13,17,18-octamethyl-5,10,15,20-tetraphenylporphinato) Zn(II)-pyridine-2HCCl3 (ZnOMTPP·py·2HCCl3) are reported. Both molecules are severely nonpl…
Direct observations using scanning transmission electron microscopy (STEM) of the grain‐boundary chemistry of selectively doped SrTiO 3 and BaTiO 3 show the predominant solute segregation in both systems to be that of acceptors (negative effective charge). Appreciable donor segregation is not observed even at lattice…
One important mechanical property of dental ceramics is fracture toughness, KIC, which represents the serviceability in the oral cavity, such as the resistance to marginal fracture. KIC values of several dental ceramics, natural tooth enamel and industrial ceramics were examined by use of the indentation microfracture…
Summary Direct visual studies of foam flow in etched-glass micromodels containing residual oil demonstrate that foam decays as a result of breakage of pseudoemulsion films. Foam films collapse whenever nearby thin aqueous films separating gas bubbles and oil rupture. Consequently, surfactant formulation for foam insen…
Boron and nitrogen KVV Auger electron spectroscopy (AES) and core level x-ray photoelectron spectroscopy (XPS) features are shown to be conspicuously different for the cubic and hexagonal phases of boron nitride, i.e., cBN and hBN, respectively. The origin and assignments of these features are discussed in terms of th…
Abstract A round robin test organized by the European Federation of Corrosion (EFC) Working Party on Surface Science and the Mechanisms of Corrosion and Protection, supported by the European Community Bureau of References (BCR), and further extended under VAMAS (Versailles Project on Advanced Materials and Standards),…
When blending incompatible polymers in the melt, the resulting morphology is strongly dependent on the interfacial tension. One stage of the mixing process is now used to determine this interfacial tension: in the absence of an overall flow field, extended liquid threads in a liquid matrix exhibit sinusoidal disturban…
Aluminum nitride possesses a unique ability to accommodate oxygen via lattice dissolution to levels exceeding 4 at.%. The mechanism for this large accommodation of oxygen is of technological and scientific interest due to the established delecterious effects of oxygen on the thermal conductivity in this material. When…
A general discussion of the designs and functions of the silk structures spiders use to capture prey has not been attempted since the book of Witt et al (319). Knowledge has increased so greatly in the intervening years that complete coverage is now impossible in a review article. I have cited primarily more recent an…
Anisotropic gels were produced by photopolymerization of an oriented liquid-crystalline (LC) mixture containing LC diacrylates and conventional LC molecules. Gels produced in this way were clear and did not give rise to excess scattering of light. Upon application of an electric field across the gel, the system turned…