Materials Literature
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Several mixtures obtained by ultrasonic agitation of colloidal silica with a sol solution containing tetraethoxysilane (TEOS) were used to form crack-free monoliths. The dry gels that were submitted to mercury porosimetry showed differences in behavior according to the proportion of silica colloid in the gel. For low…
Abstract Three types of low‐density polyethylene materials were investigated with respect to the influence of the molecular architecture on the mechanical and use properties of blown films. The materials were a branched polyethylene synthesized by free‐radical polymerization under high‐pressure (HP‐LDPE), a linear eth…
A series of novel halogenated alkoxy and aryloxy polyphosphazenes have been synthesized via macromolecular substitution reactions carried out on poly(dichlorophosphazene). These polymers showed good film-forming properties and tunability of refractive index. Moreover, several examples combined low glass transition tem…
This review details the combination of supramolecular chemistry and dendrimer chemistry. The use of supramolecular chemistry in the synthesis and modification of dendrimers, along with the application of dendrimers in supramolecular chemistry, is described. Many excellent examples exist within these areas; this review…
We report on the synthesis and characterization of a first iron(II) spin-crossover coordination polymer of formula [Fe(pyim) 2 (bpy)](ClO 4 ) 2 ·2C 2 H 5 OH, where pyim = 2-(2-pyridyl)imidazole and bpy = 4,4‘-bipyridine, with zigzag chain structure. The chains are linked by π stacking into a two-dimensional network. V…
A [001](110) small-angle grain boundary ${\mathrm{SrTiO}}_{3}$ was studied by electron-energy-loss spectroscopy (EELS) and high-resolution transmission electron microscopy. The $a〈110〉$ grain boundary dislocations were dissociated into two partial dislocations involving climb of the partials. From their separation an…
Paraelectric behavior due to a dynamic Jahn-Teller (JT) effect is reported for the manganese(III) spin-crossover complex [Mn(taa)] $[{\mathrm{H}}_{3}\mathrm{taa}=\mathrm{tris}(1\ensuremath{-}(2\ensuremath{-}\mathrm{azolyl})\ensuremath{-}2\ensuremath{-}\mathrm{azabuten}\ensuremath{-}4\ensuremath{-}\mathrm{yl})\mathrm{a…
Angle-resolved photoemission data from Al(001) taken with photon energies up to several hundred electron volts show an unexpected surface sensitivity at high energies. The surface state at the center of the surface Brillouin zone can be clearly observed up to photon energies higher than 700 eV. The surface to bulk int…
Optical extinction due to surface plasmon resonances of spherical and polyhedral carbon onions prepared from diamond nanoparticles has been studied. Extinction spectra for the onions dispersed in the distilled water were obtained experimentally by optical transmission spectroscopy. Theoretical considerations were give…
A randomly alkylated copolymer of N-isopropylacrylamide, methacrylic acid and N-vinyl-2-pyrrolidone was characterized with regard to its pH- and temperature-triggered conformational change. It was then complexed to liposomes to produce pH-responsive vesicles. Light scattering and differential scanning calorimetry expe…
Models for predicting the shape of organic crystals use geometrical rules and intermolecular interaction energies between the building blocks of the crystal but often ignore the environment in which the crystal grows. The resulting shapes predicted by these models may differ from the actual grown shapes since shape ca…
The boron trifluoride-catalyzed Rothemund condensation of triisopropylsilyl (TIPS) propynal 1 with 3,4-diethylpyrrole in dichloromethane, followed by oxidation with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) generates a mixture of products, including [15]triphyrin(1.1.3) H3, corrole H(3)4, porphyrin H(2)2, [24]pe…
We have used several techniques, including hyper-Rayleigh scattering and Stark spectroscopy, to investigate the effects of polyene chain length on the optical properties of complexes containing ruthenium(II) electron donor groups and pyridinium electron acceptors. In marked contrast with all other known donor-acceptor…
The structures of optical spectra of a semiconducting sphere are studied over a wide range of radius. The calculation is based on a ``microscopic nonlocal theory'' and we reformulate the theory to simplify the procedure. The nonlocal theory enables us to analyze correspondences between spectral peaks and exciton state…
On a solid surface with a surface tension gradient, a liquid drop is driven toward the more wettable end. To investigate the mechanism for the movement of the drop, we first measured directly the driving force of the drop, using a flexible glass microneedle. We determined that the driving force results from an imbalan…
We study coherent strain in (001) Ge generated by an ultrafast laser-initiated high density electron-hole plasma. The resultant coherent pulse is probed by time-resolved x-ray diffraction through changes in the anomalous transmission. The acoustic pulse front is driven by ambipolar diffusion of the electron-hole plasm…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTPreparation of Oxide Nanocrystals with Tunable Morphologies by the Moderate Hydrothermal Method: Insights from Rutile TiO2Qinghong Zhang and Lian GaoView Author Information The State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of…
2-Anthracenecarboxylic acid (AC) makes a very stable 1:2 inclusion complex with gamma-cyclodextrin (gamma-CDx) (K(1) = 161 +/- 25 M(-1), K(2) = 38 500 +/- 3300 M(-1) at 25 degrees C). The formation of the 1:2 inclusion complex accelerated the photocyclodimerization of AC. The 1:2 inclusion could be clearly verified by…
Nanostructured carbon films produced by supersonic cluster beam deposition have been studied by in situ Raman spectroscopy. Raman spectra show the formation of a sp2 solid with a very large fraction of sp-coordinated carbyne species with a long-term stability under ultrahigh vacuum. Distinct Raman contributions from p…
Recent high-temperature studies of Raman-active modes in single-walled carbon nanotube (SWNT) bundles report a softening of the radial and tangential band frequencies with increasing sample temperature. A few speculations have been proposed in the past to explain the origin of these frequency downshifts. In the presen…