Materials Literature
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The hydrogen bonding directed formation of a photochromic multilayer film was achieved on the basis of alternating assembly of poly(4-vinylpyridine) and poly(acrylic acid) bearing spironaphthoxazine. The assembling process was followed by UV−vis spectroscopy and X-ray diffraction measurement. Atomic force microscopy w…
On a solid surface a monolayer mixture may separate into two phases. The phases can self-assemble into a variety of patterns, with the feature size on the scale of 1--100 nm. This paper studies how the elastic anisotropy of the substrate affects the patterns. The substrate is taken to be of cubic crystal symmetry, alt…
We present an analytical theory on the heights of the quantum steps observed in the hysteresis loops of molecular magnets. By considering the dipolar interaction between molecular spins, our theory successfully yields the step heights measured in experiments, and reveals a scaling law for the dependence of the heights…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTFour-Phase Triple Coaxial Cylindrical Microdomain Morphology in a Linear Tetrablock Quaterpolymer of Styrene, Isoprene, Dimethylsiloxane, and 2-VinylpyridineKeiko Takahashi, Hirokazu Hasegawa, Takeji Hashimoto, Vasilios Bellas, Herm…
The synthesis of seven monoazo benzotriazole dyes for use in surface enhanced resonance Raman scattering, SERRS, is reported. The dyes are all capable of complexing to the silver surface used to provide the surface enhancement found in SERRS and hence act as 'model' analytes. One dye was examined in detail and showed…
The crystal structures of two new metal-cyanide clusters with record high nuclearities are reported. A direct assembly reaction involving [(Me(3)tacn)Cr(CN)(3)] (Me(3)tacn = N,N',N"-trimethyl-1,4,7-triazacyclononane), NiI(2), and KCN in aqueous solution affords [(Me(3)tacn)(12)Cr(12)Ni(12)(CN)(48)](12+). The structure…
In an effort to study viscoelastic (vector) percolation and conductivity (scalar) percolation within a single system, we demonstrate a conducting polymer/solvent system, which upon gelation undergoes a viscoelastic transition, followed by a separate conductivity transition. Polyaniline doped by camphorsulfonic acid, i…
The adhesive power of the mussel is the reason that mussel adhesive proteins have been studied as a (model) system for a possible medical adhesive. After oxidation, the Dopa groups of the blue mussel ( Mytilus edulis ) foot protein Mefp-1 form Dopa−Dopa-quinone cross-links, which leads to the formation of aggregates.…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTAsymmetric Allylation Polymerization of Bis(allylsilane) and Dialdehyde Containing Arylsilane StructureToshihiro Kumagai and Shinichi ItsunoView Author Information Department of Materials Science, Toyohashi University of Technology, Toyohashi, 441-8580 Japan Cite this: Macromol…
The computer program SnB implements a direct-methods algorithm, known as Shake-and-Bake , which optimizes trial structures consisting of randomly positioned atoms. Although large Shake-and-Bake applications require significant amounts of computing time, the algorithm can be easily implemented in parallel in order to d…
The effect of molecular weight on the crystallization behavior of isotactic poly(1-butene) (iPB) under quiescent, isothermal conditions is investigated by rheological and optical microscopy techniques. Small-amplitude oscillatory shear experiments are used to determine the critical gel behavior of the crystallizing me…
Absorption microspectrophotometry has been shown to be of considerable help to probe crystalline proteins containing chromophores, metal centres, or coloured substrates/co-factors. Absorption spectra contribute to the proper interpretation of crystallographic structures, especially when transient intermediate states a…
Photoreactive phenylazide-end-capped liquid copolymers were prepared by ring-opening copolymerization of epsilon-caprolactone (CL) and trimethylene carbonate (TMC) at an equimolar monomer feed ratio in the presence of a polyol, namely, a low-molecular-weight alcohol (di-, tri-, and tetraol) or poly(ethylene glycol) (P…
A comparison of the structure, spectroscopy, and oxygen atom-transfer reactivity of cofacial bisporphyrins anchored by xanthene (DPX) and dibenzofuran (DPD) pillars is presented. The synthesis and characterization of dicopper(II) and dinickel(II) complexes of DPD completes a homologous series of homobimetallic zinc(II…
The search for a model that can be used to describe the optical excitation migration in dendrimers has attracted great attention. In most cases in a dendrimer the conjugation is disrupted at the branching point; however, the excitation is delocalized. The strength of interactions among neighboring chromophores plays a…
Abstract A series of ferrocene‐containing liquid‐crystalline polyphosphonates with an even number of methylene groups are reported. All the polymers gave birefringent melts. The mesophase was identified as transparent with an increase in the spacer. The effects of pendant substitution and the spacer were studied with…
We derive the parallel upper critical field, Hc2, as a function of the temperature T in quasi-2D organic compound lambda-(BETS)2FeCl4, accounting for the formation of the nonuniform Larkin-Ovchinnikov-Fulde-Ferrell (LOFF) state. To further check the 2D LOFF model, we propose to study the Hc2(T) curve at low T in tilte…
Novel organoarsenic polymers, poly(vinylene-arsine)s, were synthesized by a free-radical alternating copolymerization of phenylacetylene with cyclooligoarsines as an atomic biradical equivalent. The polymerization between pentamethylpentacycloarsine (1a) or hexaphenylhexacycloarsine (1b) with phenylacetylene (2) in th…
Depth, number, and shape of the basins of the potential energy landscape are the key ingredients of the inherent structure thermodynamic formalism introduced by Stillinger and Weber [F. H. Stillinger and T. A. Weber, Phys. Rev. A 25, 978 (1982)]. Within this formalism, an equation of state based only on the volume dep…
Abstract A novel process for synthesizing nylon‐6 and poly(ϵ‐caprolactone) by microwave irradiation of the respective monomers, ϵ‐caprolactam and ϵ‐caprolactone, is described. The ring opening of ϵ‐caprolactam to produce nylon‐6 was performed in a microwave oven by the forward power being controlled to about 90–135 W…