Materials Literature
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Abstract Silicon‐methoxide‐containing modified clays were obtained through cationic exchange between the sodium clay and the ammonium cation of [3‐(trimethoxysilyl)propyl]octadecyldimethylammonium chloride (Si18). The nanocomposites were prepared through bulk polymerization of styrene in which the Si18 clay was disper…
The synthesis and characterization of diblock and triblock copolymers produced by a two-component iniferter system is reported. These materials, designed for possible water treatment applications, consist of a hydrophilic poly(2-dimethylaminoethyl methacrylate) (PDMAEMA) block and a very low surface energy poly(1,1‘-d…
Crystal-nucleation phenomena of supercooled liquid o-benzylphenol are studied by differential scanning calorimetry (DSC). While crystallization proceeds with crystal nucleation and growth processes, only the latter process can be observed calorimetrically. Whether there exist crystal nuclei in the supercooled liquid o…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTKinetics of Hyperbranched Polystyrenes by Free Radical Polymerization of Photofunctional InimerKoji Ishizu, Yoshihiro Ohta, and Susumu KawauchiView Author Information Department of Organic Materials and Macromolecules, International Research Center of Polymer Science, Tokyo Ins…
Abstract Bulk poly(ethylene terephthalate) (PET) and bisphenol A polycarbonate (PC) samples have been produced by the coalescence of their segregated, extended chains from the narrow channels of the crystalline inclusion compounds (ICs) formed between the γ‐cyclodextrin (CD) host and PET and PC guests, which are repor…
An electron paramagnetic resonance (EPR) study of photoexcited colloidal InP quantum dots (QD) shows the formation of electron and hole adducts. An EPR signal at g = 0.58 is assigned to a nonradiative hole trap that does not form immediately upon illumination, but forms only after the illuminated sample ages and becom…
The dielectric relaxation behavior of miscible poly(4-vinylphenol)/poly(ethyl methacrylate) (PVPh/PEMA) blends has been studied using broad-band dielectric spectroscopy in the frequency domain from 10 -2 to 10 7 Hz and at temperatures between 30 and 180 °C. The α and β processes are resolved from the dielectric spectr…
Mesoporous MCM-41 aluminosilicates were prepared through direct synthesis and surface grafting resulting in the incorporation of aluminum into the pore walls and onto the wall surface, respectively. 7Li and 23Na NMR studies of ion-exchanged Li and Na-Al-MCM-41 were able to distinguish between cations in the surface re…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTViscoelastic Properties of Polybutadiene in the Glassy Regime from Molecular Dynamic SimulationsOleksiy Byutner and Grant D. SmithView Author Information Department of Chemical and Fuels Engineering and Department of Materials Science and Engineering, 122 S. Central Campus Driv…
Dynamical process of helium bubbles in face‐centred cubic (fcc) metals has been studied by in situ irradiation and electron microscopy with a video recording system. Brownian type motion of helium bubbles was demonstrated quantitatively by establishing a proportional relation between the mean square of the bubble migr…
We present the fundamental problem of polar oxide surfaces and overview the different models for the stabilization of their diverging surface energy. We focus on contributions from ex situ and in situ electron microscopy and diffraction techniques toward distinguishing between competing stabilization mechanisms in oxi…
The influence of the preparation route on the microstructure of indium species in In−ZSM-5 catalysts for the selective reduction of NO by hydrocarbons has been investigated. Samples were prepared by aqueous ion exchange, by precipitation with or without previous ion exchange step, by reductive solid-state ion exchange…
Abstract Reactions producing Al‐rich index minerals in the south‐eastern part of the Lepontine Dome (Central Alps, Switzerland) are investigated using mineral distribution maps, microstructural observations and equilibrium phase diagrams. The apparent staurolite mineral zone boundary corresponds to the paragonite brea…
Aging was found to be an important step for obtaining high-surface-area zirconia aerogels prepared by the sol−gel method using zirconium n-propoxide and subsequent supercritical drying with carbon dioxide. A narrow and much sharper pore size distribution of calcined zirconia aerogels could be obtained only after exten…
The fabrication of cobalt oxide nanotubes (length 3−4 μm, width 200−400 nm) was achieved by a colloidal templating approach. In this approach, a Co(III)−cysteinato complex [Co(en) 2 (S-cys)] 2+ 2(BF 4 - ) was employed as the precursor of cobalt oxide. The infiltration behavior of the precursor into polyelectrolyte mul…
In this work, the formation of unusual flowerlike structures with 10-petals composed of BaSO 4 single crystalline platelets is described. The structures are obtained at pH 5 in an aqueous solution in the presence of a double hydrophilic block copolymer poly(ethylene oxide)- block -sulfonated poly(ethylene imine) (PEO-…
For fabrication of a planar array of 1D chains of gold nanoparticles prepared by a chemical process, the faceted (110) planes of sodium chloride crystals were used as templates to produce nanoscale ridge-and-valley structured carbon layers by a vacuum process. When these carbon layers loaded on copper grids were dippe…
Nanoscale tailored polymer crystalline morphology is studied in a polystyrene- b -poly(ethylene oxide) (PS- b -PEO) diblock copolymer with number-average molecular weights for the PS and PEO blocks being 17 000 and 11 000 g/mol, respectively. The PEO volume fraction is 0.39. After large amplitude planar reciprocating…
The study of the electron relaxation and dynamics of polaron charge carriers in undoped and ${\mathrm{H}}_{2}{\mathrm{SO}}_{4}$-doped polyaniline (PANI) by means 3-cm (9.7 GHz) and 2-mm (150 GHz) EPR spectroscopy, and ac, superconducting quantum interference device, and dc conductometries is reported. The existence in…
${\mathrm{CuS}}_{2}$ and ${\mathrm{CuSe}}_{2}$ with pyrite structures were systematically studied by transport, magnetization, and specific-heat measurements. In remarkable contrast to other $3d$ transition-metal pyrites, a clear indication of strong electron correlations was absent in the electronic properties of Cu…