Materials Literature
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We calculate, employing the classical theory of nucleation and growth, the effective diffusion coefficients controlling crystal nucleation of nanosize clusters and the subsequent growth of micron-size crystals at very deep undercoolings, below and above Tg, using experimental nucleation and growth data obtained for st…
Eine ganze Familie: Organophosphonatkomplexe des Vanadiums in hoher Oxidationsstufe sind verbreitet, ihre VIII-Analoga sind dagegen äußerst dünn gesäht. Aus VCl3 und Phosphonaten entsteht unter Solvothermalbedingungen eine ganze Familie entsprechender Vanadium(III)-phosphonate, darunter der schichtförmige Cluster {VII…
Abstract Quiescent melt crystallization rates of various polyolefins including high density polyethylene (PE), isotactic form of polypropylene (PP), polybutene‐1 (PB1), and poly(4‐methyl pentene‐1) (P4MP1) were investigated under both isothermal and nonisothermal conditions using differential scanning calorimetry (DSC…
A novel hyperbranched polymer with aryl borate backbone was obtained by a facile A2+B3 method. Thermal analysis revealed that HBb exhibited excellent thermal stability with a Tg of 221 °C and a weight residue of 71.3% at 800 °C under nitrogen atmosphere. HBb displayed good solubility with readily soluble in common pol…
Understanding electronic communication among interacting chromophores provides the foundation for a variety of applications. The ground-state electronic communication in diphenylethyne-linked zinc-porphyrin dyads has been investigated by a novel molecular design strategy that entails introduction of a 13C-atom (*) at…
Abstract Friedel–Crafts self‐grafting of polystyrene (PSt) under quasiliving carbocationic polymerization was utilized to develop a new rapid one‐pot method for the preparation of star‐shaped polyisobutylene (PIB). First, the polymerization of isobutylene led to PIB with predetermined molecular weight ( $\overline M _…
Kavitationsblasen: Ihr Zerfall erzeugt eine mechanische Spannung, die durch zwei mechanosensitive Polymere an den Enden eines Benzocyclobutens gezielt auf eine bestimmte Bindung übertragen wird. So überraschend es scheinen mag, werden die Moleküle durch Ultraschall auf verbotene Reaktionswege gelenkt, indem unabhängig…
Abstract A TEMPO bromide salt is used to functionalize a silica surface with nitroxyl moieties. The functionalization reaction takes place in 48 h under mild conditions. In a second step, grafts of styrene‐maleic anhydride copolymer are grown from the functionalized silica surface by heating it in the presence of the…
Diblock copolymer nanostructures with metal oxide nanoparticles are prepared on solid supports by spin-coating. The maghemite nanoparticles (Fe 2 O 3 ) are masked with grafted polystyrene chains to allow a tailored positioning on top of nanostructures created by the symmetric polystyrene- block -polyisoprene diblock c…
Ultrathin amorphous carbon ( a -C) films were synthesized on Si(100) substrates by low-pressure, radio-frequency sputtering under different plasma discharge conditions. X-ray photoelectron spectroscopy (XPS) revealed different contents of C, Ar, Si, O, and N in the a -C films. The percentages of tetrahedral (sp 3 ) an…
Abstract Sodium fluorohectorite (FH) was dispersed in polystyrene (PS) by direct melt blending with and without a master batch composed of PS and FH and produced by latex compounding. FH was not intercalated by PS when it was prepared by direct melt compounding. In contrast, FH was well dispersed (mostly intercalated)…
Abstract Nanostructured TiO 2 thin films were prepared using an amphiphilic PS‐ b ‐PEO block copolymer as a templating agent. A good–poor solvent pair‐induced pair phase separation process was coupled with sol–gel chemistry to control the morphology of the TiO 2 film in a solution of 1,4‐dioxane, concentrated HCl, and…
A series of novel tri- and pentanuclear complexes composed of dinuclear LM(2) units (M=Co, Ni, Zn; L=24-membered macrocyclic hexaazadithiophenolate ligand) and ferrocenecarboxylate ([CpFeC(5)H(4)CO(2)](-)) or 1,1'-ferrocenedicarboxylate ([Fe(C(5)H(4)CO(2))(2)](2-)) groups is reported. The complexes [LM(II) (2)(O(2)CC(…
Reduced and reoxidized: Thin films (100 nm) of tetrakis(thiadiazole)porphyrazine (see picture) are highly ordered in an unusual orientation of the molecular planes owing to the strong self-assembling ability of these crystals. Electrochemical reduction of the thin films induces reversible electrochromism and n-type ca…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of Homo- and Copoly(arylene bicarbazole)s via Nucleophilic Substitution Polycondensation Reactions of NH Groups with Activated DihalidesYan Gao, Antisar Hlil, Jinyan Wang, Ke Chen, and Allan S. HayView Author Information D…
Polyelectrolyte complexes (PECs) between (quaternized) poly[2-(dimethylamino)ethyl methacrylate] (PDMAEMA) and (crosslinked) N-carboxyethylchitosan (CECh) or poly(2-acrylamido-2-methylpropane sodium sulfonate) (PAMPSNa) were prepared and characterized in terms of their stability, equilibrium water content, and surface…
The good, the bad, and the poly: Amphiphilic poly(methyl methacrylate)-block-poly(ethylene oxide) can be used as a template to give anatase TiO2 films with stable nanovesicle morphology (see image). The process couples a good/poor solvent-pair-induced phase-separation process and sol–gel chemistry. The multilayer tita…
The density functional theory is used to explore structural, electronic, and vibrational properties of NO, NO(2), and NO(3) adsorption on small silver clusters, Ag(n), with n =1-8. Generally, NO adsorbs in a top configuration, whereas NO(2) and NO(3) are adsorbed in bridge configuration. NO2 and NO3 introduce pronounc…
We report on a carbon nanotube network which is composed of aligned metallic and randomly oriented semiconducting single-walled carbon nanotubes. The material is formed by using a novel radio frequency dielectrophoresis setup, which generates very large dielectrophoretic force fields and allows dielectrophoretic assem…
Abstract Carbon nanofibers were produced from a polyacrylonitrile/ N,N ‐dimethylformamide precursor solution by an electrospinning process and later pyrolysis at temperatures ranging from 500 to 1100°C in an N 2 atmosphere for about 1 h. The morphological structure of the nanofibers was studied with scanning electron…