Materials Literature
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Perfect dendrimers that contain perfluorinated shells have recently attracted attention because they have been shown to encapsulate polar molecules in supercritical CO(2) and catalytically active metal nanoparticles in perfluorinated solvents. Moreover, they can then be easily separated after reaction from the biphasi…
Ge 2 Sb 2 Te 5 films were deposited by RF magnetron sputtering on Si(100)/SiO 2 substrates. N + ion was implanted into Ge 2 Sb 2 Te 5 films. Two obvious steps were observed in the resistance–temperature curve of the Ge 2 Sb 2 Te 5 -N film with a minor nitrogen implant dose. The two steps may change into one step becau…
There's room at the top: In the coordination sphere of hexacoordinate organosilanes with O- and N-donor ligands (see picture) the SiC bond is elongated and activated. This effect is so strongly pronounced that cleavage of one SiC bond and migration of this organo substituent takes place upon irradiation with UV ligh…
Abstract A newly developed kind of layered clay, rectorite (REC), has been used to yield intercalated or exfoliated thermoplastic polyurethane rubber (TPUR) nanocomposites by melt‐processing intercalation. Because of the swollen layered structure of REC, similar to that of montmorillonite, organic rectorites (OREC) ca…
Molecular and material properties of major ampullate silk were studied for the cobweb-building black widow spider Latrodectus hesperus. Material properties were measured by stretching the silk to breaking. The strength was 1.0 +/- 0.2 GPa, and the extensibility was 34 +/- 8%. The secondary structure of the major ampul…
We report the use of electrolyte variations as a means to actively control redox and n-type doping processes in π-conjugated electroactive polyheterocycles. Specifically, a series of donor−acceptor bis-EDOT-pyridine polymers, poly[2,5-bis-(2,3-dihydro-thieno[3,4- b ][1,4]dioxin-5-yl)-pyridine] (PBEDOT-Pyr) and poly[5,…
A high-tech alternative to diamond and graphite: Supramolecular carbon allotropes are formed when single-walled carbon nanotubes are filled with C60 molecules. Similar “molecular peapods“ are also obtained by insertion of endohedral fullerenes and metallocenes into carbon nanotubes. Supramolecular nanotubes built up f…
Inversed micelles formed by polystyrene-block-poly(2-vinyl-pyridine) in toluene loaded with FeCl3 were used to synthesize and deliver discrete Fe2O3 nanoclusters with uniform diameters to flat substrates. Single-walled carbon nanotubes (SWNTs) were grown by chemical vapor deposition using these nanoclusters as the cat…
The different polytypic structures observed in transition metal dichalcogenides are described as the result of ordering processes from a common parent disordered polytype structure. Interpolytypic transitions are suggested to be favored by the intrinsic stacking faults induced in the ordering mechanisms. The influence…
Abstract The relation between the mechanical properties and the microstructure of PET has been investigated, combining results from WAXS, SAXS, FTIR, DSC, and uniaxial compression tests. The rigid amorphous fraction in the PET was explicitly taken into consideration in interpreting structure–property relations. WAXS r…
In this paper, we investigate the electrical, optical and structural properties of Li-doped SnO 2 transparent conducting films deposited on glass substrates by the spray pyrolysis technique. The SnO 2 :Li thin films were deposited at a substrate temperature of 480 °C using an aqueous ethanol solution consisting of tin…
Abstract The preparation and properties of nanocomposites, consisting of a poly(3‐Hydroxybutyrate‐ co ‐3‐hydroxyvalerate) and an organophilic clay are described. The effect of organophilic clay on the crystallization behavior of (PHBV) was studied. A differential scanning calorimeter (DSC) was used to monitor the ener…
Single-walled carbon nanotubes functionalized with the OH group-terminated moieties (“hydroxyl nanotubes”) have been prepared by fluorine displacement reactions of fluoronanotubes with a series of diols and glycerol in the presence of alkali, LiOH, NaOH, or KOH or with amino alcohols in the presence of Py as a catalys…
A simple and rapid two-step anodic oxidization method, including annealing- and polishing-free pretreatment and electrochemical membrane detachment, has been used to prepare ordered and through-hole porous alumina membrane.
Current induced switching in Co/Cu/Co trilayers is described in terms of ab-initio determined magnetic twisting energies and corresponding sheet resistances. In viewing the twisting energy as an energy flux the characteristic time thereof is evaluated by means of the Landau-Lifshitz-Gilbert equation using ab-initio pa…
The dependence of the magnetoresistance of quasi-one-dimensional metals on the direction of the magnetic field show dips when the field is tilted at the so called magic angles determined by the structural dimensions of the materials. There is currently no accepted explanation for these magic angle effects. We present…
The thermal behavior and molecular interaction of a new type of bacterial copolyester, poly(3-hydroxybutyrate- co -3-hydroxyhexanoate), P(HB- co -HHx) (HHx = 12 mol %), was investigated by using wide-angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC). The WAXD measurements were carried out over…
We present a density-functional-theory (DFT) study of the reactivity towards CO oxidation of Au nanoparticles supported by MgO(100). We model two geometrical aspects of the Au particles, the low index facets of the Au particles, and the Au-MgO interface boundary. The precise structure of the interface boundary depends…
The 18S ribosomal DNA molecular phylogeny and lipid composition of over 120 marine diatoms showed that the capability to biosynthesize highly branched isoprenoid (HBI) alkenes is restricted to two specific phylogenetic clusters, which independently evolved in centric and pennate diatoms. The molecular record of C25 HB…
We report the synthesis of a new nanocrystal (NC) mesophase through self-assembly of water-soluble NC micelles with soluble silica. The mesophase comprises gold nanocrystals arranged within a silica matrix in a face-centered cubic lattice with cell dimensions that are adjustable through control of the nanocrystal diam…