Materials Literature
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A model of ferroelectric switching that describes crystals composed of a large number of relatively small grains is presented. It is shown that, if the grain boundaries stop or significantly affect domain-wall growth, then the observed switching current transients will deviate from those predicted by the infinite-grai…
The results of a study on silicone rubber and ethylene propylene diene monomer (EPDM) polymers are presented. The study was done to understand the mechanisms involved in the loss and subsequent recovery of surface hydrophobicity due to dry-band arcing and to investigate various experimental techniques which could be u…
When deposited on a silicon substrate, symmetric polystyrene/polymethylmethacrylate P(S-b-MMA) diblock copolymers form, at equilibrium, a multilayer structure parallel to the substrate. If the top layer is incomplete, islands or holes are formed in this layer. The kinetics of formation and growth of islands or holes i…
The synthesis and characterization of free-standing flexible films and powder forms of pernigraniline base, the fully oxidized form of polyaniline, by the oxidation of emeraldine base with m-chloroperbenzoic acid is reported.
A model is presented for the elasticity of networks composed of rigid chains. The elastic modulus as a function of polymer volume fraction is determined for two cases : (a) the chains are rigidly crosslinked to each other i.e. the network may only deform by bending the chains (energetic network) and, (b) the chains ar…
The measurement of the transverse modulus of single fibres having a diameter of 5–15 μm has become possible by the development of a new instrument. An account is given in this paper of an investigation of some typical high-performance fibres for their transverse modulus and their fibre strength in transverse compressi…
New antibiotic pumilacidins A, B, C, D, E, F and G were isolated from the culture broth of a strain of Bacillus pumilus. They are cyclic acylheptapeptide composed of a beta-hydroxy fatty acid, two L-leucine, two D-leucine, L-glutamic acid, L-aspartic acid and L-isoleucine (or L-valine). Pumilacidin components were inh…
Natural systems provide time-controlled experiments on scales unreachable in the laboratory, and with complexities unapproachable by computer experiments. Since temperature (undercooling) cannot be directly scaled with time, in situ crystallization experiments provide information unavailable by other means. The kineti…
By applying the Landau theory, the appearance of the antiferroelectric phase in smectic liquid crystals and the double hysteresis loop are interpreted. Several types of phase sequences including the antiferroelectric, ferroelectric and/or ferrielectric phase are obtained phenomenologically. The D - E curves in the ant…
Communicated Jan. 12, 1990
The first two editions of the E. coli Gene-Protein Index were published to provide identifications of protein spots resolved by two-dimensional gel electrophoresis as the products of known genes. This third edition has been expanded to include information about genes and proteins gained directly from two-dimensional g…
A series of Pt(diimine)(dithiolate) complexes has been synthesized and characterized spectroscopically. The diimine ligands include 2,2′-bipyridine (bpy), 1,10-phenanthroline (phen), 4,4′-dimethyl-2,2′-bipyridine (dmbpy), 4,4′-diphenyl-2,2′-bipyridine (dpbpy) and 4,7-diphenyl-1,10-phenanthroline (dpphen) while the dit…
A new density modification technique - histogram matching - is being developed with encouraging results. Its application to the known structure of pig 2Zn insulin refines the 6500 1.9 Å MIR phases from a mean error of 60° to one of 46°. With these refined phases as a starting point for phase extension to 1.5 Å, the me…
The addition of Ta 2 O 5 , Nb 2 O 5 , and HfO 2 enhanced the transformability of Y 2 O 3 ‐stabilized tetragonal ZrO 2 polycrystal (Y‐TZP), which was indicated by an increase in phase transformation temperatures and fracture toughness of Y‐TZP. Comparison of the alloying effects of these oxides on the transformability…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemically induced isothermal phase transition in polymer liquid crystals with mesogenic phenyl benzoate side chains. 1. Calorimetric studies and order parametersTomiki Ikeda, Shin Horiuchi, Durga B. Karanjit, Seiji Kurihara, and Shigeo TazukeCite this: Macromolecules 1…
Coverage includes: thin films; semiconductors; gallium arsenide; friction-reducing coatings; and tribological properties.
A model is used to predict solid particle formation during spray pyrolysis by correlating droplet shrinkage before salt precipitation with its relative solution saturation. For the rapid drying conditions and droplet size of ∼ 10 μm, which are characteristic of conventional spray pyrolysis, solid salt particles are fo…
The axisymmetric creeping motion of a neutrally buoyant deformable drop flowing through a circular tube is analysed with a boundary integral equation method. The fluids are immiscible, incompressible, and the bulk flow rate is constant. The drop to suspending fluid viscosity ratio is arbitrary and the drop radius vari…
Hydroboration of π-donor substituted alkynes D–CC–H [D = Ph2P, 4-X–C6H4-(X = H, MeS, MeO, H2N), and (η5-C5H5)Fe(η5-C5H4-)] with dimesitylborane {[(mes)2BH]2, mes = 2,4,6-Me3C6H2} yields air-stable ‘push–pull’E-alkenes of the form E-D–CHCH–B(mes)2, which possess large molecular hyperpolarizabilities, β, as shown by ele…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolvent- and mechanical-treatment-induced conformational transition of silk fibroins studies by high-resolution solid-state carbon-13 NMR spectroscopyMika Ishida, Tetsuo Asakura, Motoko Yokoi, and Hazime SaitoCite this: Macromolecules 1990, 23, 1, 88–94Publication Date (Prin…