Materials Literature
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Comparisons of experimental optical and acoustical bubble size spectra disagree in size distribution at the low end of the spectrum. Previous methods of obtaining acoustic bubble size information relied strictly on resonant acoustical scattering and absorption theory. For some plausible distributions, these traditiona…
The concept of using engineering principles as an aid in designing textile fabrics with desirable aesthetic characteristics is further developed. Fundamental to this ap proach is the measurement of fabric mechanical and surface properties, e.g., fabric tensile, shear, bending, surface, and lateral compression properti…
New polyesters prepared by the intefacial polycondensation of 2,6-bis(4- hydroxybenzylidene ) cyclohexanone (I) and 2,6-bis(4-hydroxy-3-methoxybenzylidene)- cyclohexanone (II) with 4,4'-diphenic, isophthalolyl, terephthaloyl, adipoyl and sebacoyl dichlorides have been produced. The yield and the values of reduced visc…
Abstract The structure of solvated cadmium(II) ion and the tetrathiocyanatocadmate(II) complex in N,N-dimethylformamide (DMF) has been determined by means of X-ray diffraction at 25 °C. The radial distribution curve for a cadmium(II) perchlorate DMF solution is well explained in terms of the presence of the octahedral…
A two‐step electrolytic anodization process, denoted as the "soft/hard" process, has been studied as a means of fabricating a high quality dielectric. A layer of porous (soft) anodized aluminum followed by boric acid barrier (hard) anodization produced a dense amorphous aluminum oxide with excellent dielectric propert…
Abstract Aiming application of the high hole drift mobility in organopolysilanes, the organopolysilane-based organic layered photoreceptors for electrophotography have been developed with phthalocyanine pigments as a photo-generating material. The photoreceptor combined with titanylphthalocyanine exhibited the high se…
A combination of electrochemical and radiotracer methods offers a unique possibility of studying the motion of counter‐ and co‐ions during electrochemical transformations occurring in a polymer film. In addition, information can be obtained about the embedding of electrolytes during electropolymerization penetration o…
Twin‐related (tetragonal (T), rhombohedral (R)) adjacent ferroelectric domains, which require a smaller energy for the rotation of the polarization vector, have been found to occur in lead zirconate titanate type piezoceramics at the morphotropicphase boundary, explaining the triplet splitting observed in electron dif…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrostatic properties of L-alanine from x-ray diffraction at 23 K and ab initio calculationsRiccardo Destro, Riccardo Bianchi, and Gabriele MorosiCite this: J. Phys. Chem. 1989, 93, 11, 4447–4457Publication Date (Print):June 1, 1989Publication History Published online1 Ma…
Nonreciprocal devices based on a section of two coupled lines containing ferrite magnetized in the propagation direction are investigated. The necessary conditions for nonreciprocal operation are derived. Several configurations are proposed and their scattering matrices are given. An explanation of the action of exper…
The sexual reproduction of Navicula oblonga is described. Cells aggregate actively and lie side-by-side, touching each other as they enter meiotic prophase. In contrast to some other species traditionally included in Navicula, the gametangia do not subsequently separate and no copulation envelope is produced. Each gam…
Abstract During the thermo‐oxidation at 90°C of unsubstituted or N‐substituted aliphatic polyamides, formation of products which absorb in the UV and visible regions is observed. These products are photo‐instable either at short wavelengths or at long wavelengths and their photo‐reactivity is wavelength dependent. The…
Octasubstituted phthalocyanine derivatives have been synthesized and characterized. The mesophases were studied by optical microscopy, differential scanning calorimetry and small angle X-ray diffraction. For the 2-ethyl-hexyloxy-derivative, three transitions are observed at 170°C, 223°C and 270°C. In the latter temper…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSubstrate selectivity in epoxidation by metalloporphyrin and metallosalen catalysts carrying binding groupsRonald Breslow, Alan B. Brown, Richard D. McCullough, and Peter W. WhiteCite this: J. Am. Chem. Soc. 1989, 111, 12, 4517–4518Publication Date (Print):June 1, 1989Public…
Polarized reflectance spectra of the organic superconductors protonated and deuterated \ensuremath{\kappa}-(BEDT-TTF${)}_{2}$[Cu(NCS${)}_{2}$] (H and D salts) [BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene] were measured over the range from 500 to 28 000 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ at room temperatur…
The dissociation of O2 on Ni(100) has been studied using a cluster model approach. The three principally different reaction pathways, over an on-top position, over a bridge position, and over a fourfold hollow position, were considered. The dissociation mechanisms were found to be very similar for these pathways. In t…
The orientational freezing of a system of hard ellipses, as a first approximation for a nematogen adsorbed on a smooth substrate, is studied with the aid of an approximate density-functional theory used previously for the study of hard ellipsoids. The isotropic-nematic transition, which was first order for the ellipso…
Modulated phases that occur in tilted chiral smectic liquid crystals are discussed within mean-field theory in thin films and in bulk. A chiral term in the free energy containing three order parameters and one gradient can make the free energy of certain defects negative or the bend elastic constant negative. Assuming…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheory of optimization of the experimental conditions of preparative elution using the ideal model of liquid chromatographySadroddin. Golshan-Shirazi and Georges. GuiochonCite this: Anal. Chem. 1989, 61, 11, 1276–1287Publication Date (Print):June 1, 1989Publication History P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConductance control of porphyrin solids by molecular design and dopingKazuo Yamashita, Yutaka Harima, and Tatsuro MatsubayashiCite this: J. Phys. Chem. 1989, 93, 13, 5311–5315Publication Date (Print):June 1, 1989Publication History Published online1 May 2002Published inissue…