Materials Literature
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We have identified three smectic phases, smectic A, ferrielectric and antiferroelectric, in a free-standing film of the first component compound of the mixture which was reported to show the V-shaped switching usable for realizing attractive displays [Inui et al. .: J. Mater. Chem. 6 (1996) 671]. The switching in the…
Three axially bis-ligated Fe(II) porphyrinates, [PFeL 2 ], have been investigated by Mössbauer spectroscopy over the temperature range 4.2−230 K and in an applied field of 6 T. Relatively large differences in the quadrupole splitting Δ E Q were found among [TMPFe(2-MeImH) 2 ] ( 1 ), [TMPFe( N -MeIm) 2 ] ( 2 ), and [OE…
We consider the phase behavior of a symmetric AB diblock, blended with corresponding A and B homopolymers, all of equal chain length. Evaluating the phase diagram in mean-field theory at all compositions of the ternary blend, we find no hexagonal and cubic phases. However, up to three distinct lamellar phases can coex…
The direct reaction of liquid (or melted solid) 1-alkanols or 1,omega-alkanediols with solid finely ground VOPO(4). 2H(2)O in a microwave field leads to layered complexes of the composition VOPO(4).2C(n)()H(2)(n)()(+1)OH (n = 1-18) or VOPO(4).C(n)()H(2)(n)()(OH)(2) (n = 2-10), respectively. The results of X-ray diffra…
Bimetallic complexes of the type (C 5 Me 5 ) 2 Sm−R−Sm(C 5 Me 5 ) 2 were used for the living bis-initiated polymerization of methyl methacrylate and ε-caprolactone, giving polymers with discrete functionalities at the center of the backbone (“link-functionalized”). Poly(methyl methacrylate) containing olefin units was…
The synthesis and characterization of a polymer composite system containing quantum-confined II−VI semiconductor particles entrapped in a polyphosphazene network is discussed. A hybrid material was constructed using a guest:host approach in which the ion transporting ability of [NP(OCH 2 CH 2 OCH 2 CH 2 OCH 3 ) 2 ] n…
It is demonstrated that the current-voltage characteristics of platinum-thin insulator silicon carbide diodes react rapidly to changes of the concentration of oxygen and hydrocarbons in the ambient already at temperatures around 500/spl deg/C-600/spl deg/C. In this letter, we use moving gas outlets to, for the first t…
1,1‘,5,5‘-tetramethyl-6,6‘-dioxobis(verdazyl) (BVD) reacts with copper(I) halides in acetonitrile and copper(II) halides in methanol to give copper(I) coordination polymers of composition [Cu 2 X 2 (BVD)] x . When X = Cl and X = Br, these polymers crystallize in orthorhombic unit cells with dimensions a = 6.684(1) Å,…
Two magnetic molecular clusters containing almost coplanar rings of iron (III) ions with spin S=5/2 have been investigated by $^{1}\mathrm{H}$ NMR and relaxation measurements. The first system, which will be referred to as Fe6, is a molecule of general formula [${\mathrm{NaFe}}_{6}$(${\mathrm{OCH}}_{3}$${)}_{12}$(${\m…
Abstract An epoxy based polymer with nonlinear optical azo chromophores was designed to contain anionic groups to induce water solubility and self assembly. Using this polyanion with a polycation, multilayers were prepared on a glass substrate by alternating adsorption from dilute aqueous solutions. The azo chromophor…
Ultrathin films of a symmetrical polystyrene- block -poly(2-vinylpyridine) diblock copolymer with a degree of polymerization of 600 were prepared by spin coating from a nonselective solvent, i.e., CHCl 3, on mica. The concentration of the casting solutions was chosen to be too low to allow homogeneous coverage of the…
Abstract— Microstructure and mechanical properties of HP (Hot Pressed), HP/GP (Gas Pressed), and HP/HIP (Hot Isostatic Pressed)—Si 3 N 4 are studied using scanning electron microscopy, bending tests and the indentation fracture method. The grain diameter distribution is analyzed to clarify the relationship between mic…
The impact sensitivity of liquid nitroglycerin, 50% initiation level, was observed to be near 1.8 kg∗cm or 3.3 × 103 j/m2. The impact sensitivity of solid nitroglycerin, 50% initiation level, was observed by extrapolation to be near 200 kg∗cm or 4.4 × 105 j/m2. The impact sensitivity of a mixture of solid and liquid N…
A new manganite (${\mathrm{La}}_{0.7}$${\mathrm{Sn}}_{0.3}$${)}_{2}$${\mathrm{Mn}}_{2}$${\mathrm{O}}_{7}$ has been discovered that exhibits colossal magnetoresistance (CMR) near the Curie temperature and semiconductor-metal transition temperatures similar to that of ${\mathrm{La}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$…
The 119Sn magic angle spinning NMR spectra of the three tin sulfides SnS, SnS2 and Sn2S3 are discussed with respect to results from x-ray structure analysis. The distortion from an octahedral environment of tin in SnS and Sn(II) in Sn2S3 is reflected in the large chemical shift anisotropy. The denser coordination sphe…
Abstract ZnO films have been prepared by alternate supply of zinc acetate and H2O. A rate of film growth is nearly equal to an ideal rate expected for atomic layer epitaxy when both zinc acetate and H2O are sufficiently supplied. The morphology of ZnO films is affected by amount of zinc acetate and H2O per cycles.
ABSTRACT Diatom material from South Africa and Swaziland was examined with light and scanning electron microscopy. Five new taxa are proposed: Gomphonema crocodilei, G. quasicrocodilei, G. venusta, G. latistigmata, and G. cholnokyi. Gomphonema venusta has been previously misidentified as Gomphonema clevei Fricke and G…
Revised nomenclature, a new key to the species, improved classification, diagnostic characteristics, geographic distribution and habitat of Periploca L. and its fourteen species are presented. Cyprinia Browicz is reduced to synonymy with Periploca.
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTNovel Photocoupling Reaction in Two-Component Crystals of Tetracyanobenzene with Benzyl CyanideYoshikatsu Ito, Sotaro Endo, and Shigeru OhbaView Author Information Department of Synthetic Chemistry & Biological Chemistry Faculty of Engineering Kyoto University, Kyoto 6…
States that duplex (austenitic/ferritic) stainless steels offer properties of interest and a cost‐effective material selection solution for plant and equipment in the pulp and paper industry. Reviews characteristics of duplex steels leading to successful long‐term applications of 22 Cr duplex and a copper containing 2…