Materials Literature
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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…
Synthetic phytochelatin-related peptides are used as an organic coat on the surface of colloidal CdSe/ZnS semiconductor nanocrystals synthesized from hydrophobic coordinating trioctyl phosphine oxide (TOPO) solvents. The peptides are designed to bind to the nanocrystals via a C-terminal adhesive domain. This adhesive…
Ornithine cyclodeaminase (OCD) is a member of the micro-crystallin protein family, the biological activity of which is the conversion of L-ornithine to L-proline and ammonia. In order to elucidate the functional groups of this enzyme that are involved in catalysis, the crystallization of OCD from Pseudomonas putida wa…
The investigation deals with the recycling of high resiliency polyurethane (PU) foam by the application of high-power ultrasound in a continuous ultrasonic reactor. The foam has been decrosslinked at various screw speeds and various amplitudes, then blended at different ratios with the virgin polyurethane rubber (PUR)…
This work presents the novel binary and ternary composite materials, based on a low-density polyethylene, metal alloy, which have a melting point close to those of polyethylene and carbon black. Oriented structures were obtained when high-viscosity polyethylene was used as a matrix material. Resistivity of the composi…
Abstract This study focused on the crystallization promotion of poly(trimethylene terephthalate) (PTT), with an aim at engineering thermoplastics applications. The effects of organic sodium (Na) salts, including Na stearate, Na benzoate, disodium‐ p ‐phenolsulfonate (2Na‐ p ‐PS), disodium‐ p ‐hydroxybenzoate (2Na‐ p ‐…
Abstract The thermooxidative degradation of poly(oxymethylene) copolymer (CPOM‐Y) powder was studied in air in 150°C. The effect of the sequence distribution of degraded poly(oxymethylene) (POM) samples on the thermal decomposition behavior was investigated with 1 H‐NMR and gas chromatography/mass spectrometry. The re…
Ultrastructural study of cell-cell connections in the outer mantle epithelium (OME) on high-pressure-frozen specimens revealed zonula adherens, septate junctions and gap junctions in Anodonta cygnea. In order to evaluate the permeability of the paracellular pathway, the OME was incubated under gradients of lanthanum a…
Abstract The multiscale morphology of rigid poly(vinyl chloride) (PVC) formulations (in the nanometre to the micrometre range) was investigated by high resolution scanning electron microscopy, ultra‐small‐, small‐ and wide‐angle X‐ray scattering, as a function of thermo‐mechanical history. It has been shown that the h…
Abstract Functional polymers are used as additives in the formulation of fuels either for their detergency properties or for retaining cold weather operability. Examples of recent research work aimed at a better understanding of the physico‐chemical phenomena involved and at the design and synthesis of new polymers ar…
A series of N-methylated polyarylurea oligomers have been reduced with potassium metal in HMPA. These reductions result in the transient formation of arylurea anion radicals, which undergo reductive elimination of the urea linkages. The aryl moieties appear in the products as the anion radicals of oligoaryl systems. T…
We have studied relaxation in the Coulomb glass from a nonequilibrium state arising due to an abrupt change of the electron density. Our results are of relevance to some recent experiments on doped and amorphous semiconductors using metal-oxide-semiconductor field-effect transistor geometry, in which the relaxation of…