Materials Literature
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The giant, nanoporous Keplerate (NH4)42[Mo132O372(CH3COO)30(H2O)72] was incorporated into a permeable ultrathin film using a stepwise self-assembly strategy. Alternating adsorption of the Keplerate anions and PAH results in single layers with an apparent surface coverage of ≈50%. Such permeable composite coatings may…
Detailed EXAFS (extended X-ray absorption fine structure spectroscopy) measurements have been collected for two nanocrystalline forms of zirconia, namely, dense films of yttria-stabilized cubic zirconia (YSZ) and tetragonal phase powders of pure ZrO 2 . Zr and Y K edge EXAFS spectra for the YSZ films with grain sizes…
Attempts were made to prepare completely regioregular poly(3-dodecylthienylenevinylene) (PDDTV) and the completely regiorandom PDDTV. However, attempts to prepare the regioregular PDDTV by a Heck polymerization of 2-bromo-3-dodecyl-5-vinylthiophene leads to a regioirregular PDDTV that also contains cross-conjugated de…
Glycidol as latent branching AB 2 monomer was used in combination with glycidyl ethers as linear AB comonomers for the preparation of hyperbranched random copolymers with controlled degree of polymerization ( DP n = 42−72) and relatively low polydispersity ( M w /M n < 1.7). Extending previous theoretical consideratio…
The elastic-like and viscous-like viscosity components of model, Brownian hard sphere suspensions were determined. The elastic-like component, sometimes called the thermodynamic component, is due to Brownian motion while the viscous-like component, sometimes called the hydrodynamic component, is due to hydrodynamic in…
Optically active photochromic ( S )- and ( R )-1-(2-methyl-5-phenyl-3-thienyl)-2-[2-(3-methyl-1-penten-1-yl)-5-phenyl-3-thienyl]-3,3,4,4,5,5-hexafluorocyclopentenes ( ( S )-1a and ( R )-1a ) were synthesized. X-ray crystallographic measurement showed that ( S )-1a and ( R )-1a single crystals adopted orthorhombic chir…
Latex beads are used as a combined template and porogen in the fabrication of monolithic silica containing a hierarchy of pores. Prefabricated core/shell particles, prepared by the layer-by-layer assembly of zeolite (silicalite) nanoparticles onto spherical latex templates, are assembled into macroscopic close-packed…
Layered hydroxide metal acetates (metal = zinc, cobalt, and nickel) have been prepared by a new route belonging to the chimie douce method. This novel method involves the hydrolysis, in polyol medium, of in situ-formed complexes supposed to be alkoxyacetates. These layered hydroxide metal acetates present poorly order…
An electrochemical procedure, based on the dissolution of a metallic anode in an aprotic solvent, has been used to obtain silver nanoparticles ranging from 2 to 7 nm. By changing the current density, it is possible to obtain different silver particle sizes. The influence of the different electrochemical parameters on…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTThe First Example of Ammonium Selenothioates: Isolation and CharacterizationToshiaki Murai, Takeshi Kamoto, and Shinzi KatoView Author Information Department of Chemistry, Faculty of Engineering Gifu University, Yanagido, Gifu 501-1193, Japan Cite this: J. Am. Chem. So…
The synthesis and the spectroscopic and structural characterization of lower-rim-silylated and rare-earth-metalated calix[4]arenes are presented. Hexamethyldisilazane, HN(SiMe3)2, reacted in a selective manner with [p-tert-buttylcalix[4]arene]H4 (1) in refluxing mesitylene to give the 1,3-silylated product [p-tert-but…
Analytical expressions for predicting the depletion interaction in charged systems where long-range electrostatic effects are important are presented. The approach used was to model the nonadsorbing materials as hard particles but with an effective size representing the hard-core size and the effective size of the cha…
The effect of local heterogeneity on the distribution of dielectric relaxation times was studied for concentrated solutions of poly(vinyl acetate) (PVAc) in 1-methylnaphthalene (MN) and those of poly(vinyl octanoate) (PVOc) in toluene (Tol). The half-widths Λ of the dielectric loss curves for the primary processes of…
Polymer-induced interactions between two small mesoscopic particles of radius R and between a particle and a wall are investigated for dilute or semidilute embedding solutions of long flexible nonadsorbing polymer chains with radius of gyration Rg. Asymptotically exact predictions are obtained using a “small radius ex…
The UV-vis absorption spectra and the formation kinetics of sitting-atop (SAT) complexes (M(H2tpp)2+) of 5,10,15,20-tetraphenylporphyrin (H2tpp) with a series of divalent metal ions (M2+ = Mn2+, Fe2+, Co2+, Ni2+, Cu2+, and Zn2+) in acetonitrile have been investigated. The structural characteristics of the SAT complexe…
This paper addresses one of the fundamental questions in the theory of hard-disk packings—how order within a system relates to packing density. The algorithm presented is a seed-based, growth protocol in which new disks are added sequentially to the surface of a growing cluster. The angular position of the new disk is…
X-ray absorption fine structure (XAFS) spectroscopy and diffuse reflectance spectroscopy (DRS) were applied to assess the solubility-limiting phase of Ni in cement systems. The study provides first direct spectroscopic evidence for the formation of Ni- and Al-containing hydrotalcite-like layered double hydroxides (Ni−…
The interactions of H 2 O with solid H 3 PW 12 O 40 have been studied by IR spectroscopy, and the results are compared with those obtained for H 2 O interacting with other acidic or superacidic solid systems (acidic zeolites and the perfluorosulfonic membrane H-Nafion). In fully dehydrated HPW a heterogeneous family o…
The drying of thin nanocrystal solution films creates a varied range of structured aggregate spatial patterns as a function of surface coverage. These images can be understood as predicted kinetic stages in the fluid-fluid spinodal phase separation of a 2D van der Waals particle system. It is suggested that phase sepa…
Irradiation induced structural damage and evolution of mechanical properties in high entropy fluorite oxide,