Materials Literature
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Caught in the net: A series of mixed copper(I)–silver(i) cyanide complexes of the form A[Ag2Cu(CN)4] (A=K, Rb, Cs) have been found to form interpenetrating layer structures and three-dimensional networks (see picture). Two different forms of the Rb and Cs compounds are observed, which are both topological isomers and…
The effect of confinement on the phase changes and dynamics of acetonitrile in mesoporous MCM-41 was studied by use of adsorption, FT-IR, DSC, and quasi-elastic neutron scattering (QENS) measurements. Acetonitrile molecules in a monolayer interact strongly with surface hydroxyls to be registered and perturb the triple…
The discovery of the fullerene molecule C60by Kroto, Heath, and Smalley in 1985 and the subsequent discovery of carbon nanotubes by Iijima in 1991 have launched entirely new fields of materials research and development. Carbon nanotubes are single molecules that can extend to lengths approaching 0.01 mm, and they are…
Bänderspiele: Lange Alkylketten werden durch Reaktion von Stearoylchlorid mit den Aminogruppen von Bornitridnanoröhren (BNNTs) an die BNNTs gebunden. Die funktionalisierten BNNTs (siehe Bild) sind in vielen organischen Solventien löslich. Kathodolumineszenz- und UV/Vis-Absorptionsexperimente deuten an, dass die langen…
Incorporation of Eu3+ and Tb3+ ions into single crystals of cubic boron nitride (c-BN) has been performed by mixing these fluorides into a solvent for crystal growth of c-BN under high pressure. This method consequently brings luminous features into c-BN. The doped c-BN single crystals show no discernible structural c…
Diblockcopolymere aus dem helicalen Polypeptid Poly(γ-benzyl-L-glutamat) und Zufallsknäuelpolymeren wie Polyferrocenylsilanen gelieren in verdünnter Lösung thermoreversibel (siehe Bild). Für die Selbstorganisation der Blockcopolymere aus helicalen Polypeptiden wird ein neuartiger Mechanismus vorgeschlagen.
Device structure dependence of the recording efficiency of organic bistable molecular memory using photochromic diarylethene (DAE) was studied. Devices with a thicker memory layer showed faster current decrease, that is, shorter writing time. This was attributed to effective isomerization at the many carrier traps in…
Knowledge about the structural features underlying cold adaptation is important for designing enzymes of different industrial relevance. Vibriolysin from Antarctic bacterium strain 643 (VAB) is at present the only enzyme of the thermolysin family from an organism that thrive in extremely cold climate. In this study co…
Abstract Summary: Plasma enhanced chemical vapor deposition was used to deposit organosilicate glass (OSG) thin films from trimethylmethoxysilane, dimethyldimethoxysilane, and methyltrimethoxysilane. Depositions were performed from the pure OSG precursor, as well as from mixtures where either oxygen or hydrogen was ad…
The phase transitions of polystyrene- block -poly( n -pentyl methacrylate) (PS−P n PMA) have been investigated by temperature-dependent infrared spectroscopy with two-dimensional correlation spectroscopy. PS−P n PMA was shown to exhibit a closed-loop type of phase behavior, where, upon heating, a disorder-to-order tra…
This article reports on the fabrication of WO(3) nanorods using an efficient straightforward synthetic technique, without a catalyst, and using a single precursor. The thermal dissociation of WO(OMe)(4) at 700 degrees C in a closed Swagelok cell under an air/inert atmosphere yielded W(18)O(49) nanorods. Annealing of W…
Whether molecular solids, oligomers, or polymers, organic materials have been shown to be attractive candidates for both passive and active roles in electronic devices because of their compatibility with high-throughput, low-cost processing techniques and their capability to be precisely functionalized through the tec…
Rare examples of monometallic high-spin and low-spin L3Fe(H3BH) complexes have been characterized, where the two L3 ligands are [TpPh2] and [PhBP3] ([TpPh2] = [HB(3,5-Ph2pz)3]- and [PhBP3] = [PhB(CH2PPh2)3]-). The structures are reported wherein the borohydride ligand is facially coordinated to the iron center in each…
We have investigated the interactions between single-walled carbon nanotubes, coated with polymer chains end-grafted to the tubes, and planar surfaces. By proper functionalization of the grafted polymers' free ends, we show how to obtain an attractive interaction that can be used to immobilize the tube at a desired di…
The dynamical origin of the x-ray diffuse scattering by crystals of a protein, Staphylococcal nuclease, is determined using molecular dynamics simulation. A smooth, nearly isotropic scattering shell at originates from equal contributions from correlations in nearest-neighbor water molecule dynamics and from internal p…
A major obstacle for utilization of carbon nanotubes is their tendency to bundle and pack into ropes that further entangle into networks, rendering the tubes insoluble in aqueous and organic liquids, and thus almost un-processable. As was shown recently, physically adsorbed block-copolymers may be used for exfoliating…
The room-temperature reactions of nitric oxide with 46 atomic cations have been surveyed systematically across and down the periodic table using an inductively-coupled plasma/selected-ion flow tube (ICP/SIFT) tandem mass spectrometer. Rate coefficients and product distributions were measured for the reactions of first…
The synthesis of a photolabile derivative of inositol-1,4,5-trisphosphate (IP3) is described. This new caged second messenger (6-ortho-nitroveratryl)-IP3 (6-NV-IP3) has an extinction coefficient of 5000 M(-1) cm(-1) at 350 nm, and a quantum yield of photolysis of 0.12. Therefore, 6-NV-IP3 is photolyzed with UV light a…
We demonstrate a preferential nucleation, epitaxial growth, and self-attraction of crystal orientation-ordered ZnO nanorod bundles on (0001) plane of single-crystal ZnO microcones.
Neutral ethylene glycol (EG) molecules have been intercalated into zinc hydroxide layers to produce a new hybrid material in which only one kind of metal ion is included. Initially, layered basic zinc acetate (LBZA, Zn(5)(OH)(8)(CH(3)COO)(2).2H(2)O) was prepared from a methanolic zinc acetate dihydrate solution. The i…