Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
We present a novel model system for nanoparticle electrocatalysts. A surface consisting of alternating (100) and (111) facets, several nanometers across and nearly 1 microm long, were self-assembled by annealing Pt single crystal surfaces initially cut at the midpoint between [111] and [100] directions, i.e., Pt(1+ sq…
High pressure Raman experiments were performed on the model system of double-wall carbon nanotubes. Changes in the resonance Raman profile of the radial breathing modes provide a unique demonstration of the inner tubes' band gap reduction with pressure. The overall trend of the internal tubes' normalized mode pressure…
The glass-forming reactions between sodium carbonate (Na2CO3) and silica (SiO2) have been investigated by 23Na, 29Si, and 13C magic-angle spinning (MAS) NMR spectroscopy. The multinuclear MAS NMR approach identifies and quantifies reaction products and intermediates, both glassy and crystalline. A series of powdered b…
Nematic liquid crystals are well modeled as a fluid of rigid rods. Starting from this model, we use a Poisson-bracket formalism to derive the equations governing the dynamics of nematic liquid crystals. We treat the spin angular momentum density arising from the rotation of constituent molecules about their centers of…
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…