Materials Literature
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We study monolayers formed at an air−water interface on a Langmuir trough by telechelic poly(ethylene oxide) polymers end capped with hydrophobic alkane groups (C 12 and C 16 ). The pressure−area isotherms show two plateaus: the first plateau at low coverage already exists for nontelechelic PEO and is attributed to th…
A series of perylene-containing polyimides and copolyimides have been synthesized and characterized by DSC, TGA, NMR, UV−vis, and X-ray powder diffraction measurements. Xerographic electrical measurements indicated that perfectly alternating copolyimides had higher photosensitivities than those of homopolyimides and r…
The laser-induced anisotropy in thin films of an extensive number of cyanoazobenzene side-chain liquid crystalline polytetradecanedioates, -dodecanedioates, and -adipates selectively deuterated at different positions have been investigated with polarized FTIR spectroscopy. The analysis of the segmental orientation bas…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTEnhancing the Degree of Branching of Hyperbranched Polymers by Postsynthetic ModificationChristian Lach and Holger FreyView Author Information Freiburger Materialforschungszentrum FMF and Institut für Makromolekulare Chemie der Albe…
Poly( N -vinylpyrrolidone)-stabilized polystyrene (PS) latexes have been coated with thin overlayers of polyaniline (PANi) to produce electrically conductive “core−shell” particles. In this work we focused on the morphology of the PANi overlayer, the colloid stability of the coated latexes, and electrical conductivity…
Polyaniline base was protonated by blending with camphorsulfonic and picric acids in the solid state. The electrical conductivity of the equimolar mixture was more than 10 7 times higher compared with the conductivity of components used for blending. The electrical conductivity still increased several times after heat…
A silicalite-1 nanophase material with an elementary particle size of 18−100 nm is synthesized from clear solution and isolated and purified using supercentrifugation. The nanopowder is characterized in detail using scanning electron microscopy, high-resolution transmission electron microscopy, attenuated force micros…
We investigate both numerically and analytically the convective instability of granular materials by two dimensional traffic equations. In the absence of vibrations the traffic equations assume two distinctive classes of fixed bed solutions with either a spatially uniform or nonuniform density profile. The former one…
The molecular ion H3+ is considered the cornerstone of interstellar chemistry because it initiates the reactions responsible for the production of many larger molecules. Recently discovered in dense molecular clouds, H3+ has now been observed in the diffuse interstellar medium toward Cygnus OB2 No. 12. Analysis of H3+…
Introduction to the microstructural dependence of properties introduction to, and perspective on, the porosity dependence of properties porosity dependence of elastic properties at low to moderate temperatures porosity dependence of fracture energy and toughness, and related crack propagnation at 22C porosity dependen…
Detailed studies of elementary chemical processes on well-characterized single crystal surfaces have contributed substantially to the understanding of heterogeneous catalysis. Insight into the structure of surface alloys combined with an understanding of the relation between the surface composition and reactivity is s…
The paper introduces new developments of the original AREA method. A rigorous mathematical proof that the equilibrium points are the only ones which satisfy the maximum AREA criterion in the case of a two-component, two-phase system is given for the first time. A rigorous proof that the maximum AREA criterion is a nec…
Multilevel hysteresis comparators are discussed, including a new quasi-form, which incorporates standard hysteresis with error reference levels, for use in direct torque control schemes for induction motors.
The sequential bond dissociation energies (BDEs) for M + (NH 3 ) x ( x = 1−4) for M = Ti−Cu are determined by examining the collision-induced dissociation reactions with xenon in a guided ion beam mass spectrometer. In the cases of Fe, Co, Ni, and Cu, the BDE for the second ammonia molecule is determined to be greater…
The widely investigated organic substance o -terphenyl (OTP) displays thermal and kinetic behavior prototypical for “fragile” glass formers. The special relationship between its heat capacity in supercooled liquid, amorphous glass, and crystalline solid states provides simple access to the enumerating distribution fun…
A hybrid electrochemical/chemical (E/C) synthesis of zinc oxide (ZnO) nanoparticles and films is described. The E/C procedure involves two steps: Zinc metal was first electrochemically deposited at basal-plane oriented graphite electrode surfaces from dilute aqueous solutions; then this deposit was permitted to sponta…
DFT calculations on a series of oligomers have been used to estimate band gaps, ionization potentials, electron affinities, and bandwidths for polyacetylene, polythiophene, polypyrrole, polythiazole, and a thiophene−thiazole copolymer. Using a slightly modified hybrid functional, we obtain band gaps within 0.1 eV of e…
The LMTO method based on the density-functional theory and the semi-empirical INDO method based on the Hartree--Fock formalism are used for the supercell study of the F centers in cubic and orthorhombic ferroelectric KNbO3 crystals. Two electrons are found to be considerably delocalized even in the ground state of the…
The ternary azo dye/water/methanol systems were investigated by polarized microscopic and small-angle neutron scattering methods. The formation and structures of supramolecular self-assemblies were discussed in relation to methanol content in isotropic and anisotropic systems. Stripelike assemblies and their piles wer…
Competition between polaron and bipolaron inconjugated polymers with nondegenerate ground state is systematically studied in the extended Hubbard-Peierls model with the symmetry-breaking Brazovskii-Kirova term, using the density matrix renormalization group method combined with lattice optimization in the adiabatic ap…