Materials Literature
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Periodic mesoporous silicas SBA-1, SBA-2, and SBA-16 feature a unique cagelike pore topology consisting of large supercages interconnected by smaller windows. Compared to channel-like mesoporous silica MCM-48, these cagelike silicas display a distinct reactivity toward magnesium silylamides {Mg[N(SiHMe 2 ) 2 ] 2 } 2 a…
Differential scanning calorimetry has been used to study the kinetics of epoxy-amine curing reaction between diglycidyl ether of 4,4'-bisphenol and aromatic amines with different electron-withdrawing/-donating substituents. The substituents include -NO2, -CN, -OCH3, -OH, and -CH3 groups. An advanced isoconversional me…
The cylindrical geometry of nanotubes dictates a strong anisotropy of their physical properties. In practice, the difficulty in extracting individual components of the elastic tensor has limited the available information to only very partial and indirect experimental data. Here, the interlayer shear (sliding) modulus…
The synthesis of five new meso-tetraarylporphyrins having pyridine, pyrimidine, or nitrile groups extending tetragonally via alkynyl linkages from the para positions is described. The radial extension is nearly double that of common porphyrins such as tetra-p-pyridylporphyrin. Practical quantities can be produced by P…
SiO 2 and TiO 2 nanoparticles of 35−45 nm size were synthesized by hydrolysis of Si and Ti precursors, respectively, in aqueous dispersions of multiwalled carbon nanotubes, which were surface-modified by covalent bonds with dendrimers. Nanoparticle-attached carbon nanotubes were water-dispersible, owing to the contrib…
Unverkennbare Form: Durch Massenspektrometrie wurden trimere Silbercluster in wässrigen AgNO3-Lösungen identifiziert (siehe Schema). Die Cluster bestimmen die Keimbildung und sind somit maßgeblich für das Wachstum dreieckiger Silbernanoplättchen (SEM-Bild unten rechts).
Brought to a halt. Scanning electron microscopy and energy dispersive X-ray spectroscopy were used to examine morphology and silicon content around HepG2 cells treated with silicon nanowires. Morphological changes and alterations in adhesion and spreading were found to be associated with silicon around the cell bodies…
Using a modified “fixed-bed” chemical vapor deposition method, diamagnetic single-, double-, and multiwalled carbon nanotubes were synthesized. For the first time, we show that rhenium is a suitable catalyst for the synthesis of such diamagnetic nanotubes with uniform diameter and a defined numbers of shells. Scanning…
We have recently demonstrated a markedly photosensitive surface relief gratings (SRG) formation in thin films of liquid crystalline azobenzene-containing polymers, which proceeds from a cis-rich state of the azobenzene [Zettsu et al. Adv. Mater . 2001, 13, 1693; Macromolecules 2004, 37, 8692]. Such polymers exhibited…
The synthesis and photophysical properties are described for a series of porphyrin, phthalocyanine and pyrazinoporphyrazine derivatives which bear four or eight peripheral fluorenyl substituents as antennae. Representative examples are 5,10,15,20-tetra(9,9-dihexyl-9H-fluoren-2-yl)porphyrin (2), 5,10,15,20-tetrakis[4-(…
Hierarchically structured multimodal meso-macroporous carbon materials have been prepared by using the nanoreplication of the mesoporous walls of a meso-macroporous zirconia exotemplate. Like the zirconia exotemplate, the pure carbon material possesses funnel shaped straight macrochannels, parallel to each other and p…
What's next for wires? As reported in this journal and others, enormous research interest currently exists in the preparation and application of semiconductor nanowires, but is there justification for all of this work, particularly in terms of the actual utility of the devices that result? The Essay discusses what mig…
Bacterially derived poly(3-hydroxybutyrate) (P(3HB)) has been used to produce composite films by incorporating Bioglass particles (<5 microm) in 5 and 20 wt % concentrations. P(3HB) was produced using a large scale fermentation technique. The polymer was extracted using the Soxhlet technique and was found to have simi…
An investigation of hydrogen generation by the hydrolysis reaction of Al−Bi alloys in different media (pure water, 1 M NaCl solution, methanol, and ethanol) was performed at room temperature. The results show that the media have a great effect on the hydrolysis of Al−Bi alloys. In 1 M NaCl solution and in pure water,…
This paper describes the fabrication of hybrid nanoassemblies with polymer brushes and gold nanoparticles enabling detection of nanoscale optical changes based on localized surface plasmon resonance. The reversible and thermosensitive nanoscale actuation is achieved by combining stimuli-responsive polymer brushes and…
Recently developed electron-poor Pt(II) catalyst 1 with the "green" oxidant 35% hydrogen peroxide displays high activity and complete substrate selectivity in the epoxidation of terminal alkenes because of stringent steric and electronic requirements. In the presence of isolated dienes bearing terminal and internal do…
Micrometer-scaled hierarchical tubular structures of CuS assembled by nanoflake-built microspheres were first synthesized in high yield via a one-pot intermediate crystal templating process without surfactant or added templates, in which the intermediate complex Cu 3 (TAA) 3 Cl 3 formed in situ and subsequently served…
From the reaction of Ni(COD)(2) (COD = cyclooctadiene) in dry diethylether with 2 equiv of 2-phenyl-1,4-bis(isopropyl)-1,4-diazabutadiene (L(Ox))(0) under an Ar atmosphere, dark red, diamagnetic microcrystals of [Ni(II)(L*)(2)] (1) were obtained where (L*)(1-) represents the pi radical anion of neutral (L(Ox))(0) and…
The ultrafast electron transfer occurring upon Soret excitation of three new porphyrin-ferrocene (XP-Fc) dyads has been studied by femtosecond up-conversion and pump-probe techniques. In the XP-Fc dyads (XP-Fcs) designed in this study, the ferrocene moiety is covalently bonded to the meso positions of 3,5-di-tert-buty…
Differential scanning calorimetry has been used to study glassy indomethacin aged at 0 and -10 degrees C for periods of time up to 109 and 210 days, respectively. The results demonstrate the emergence of a small melting peak of the alpha-polymorph after aging for 69 days at 0 degrees C and for 147 days at -10 degrees…