Materials Literature
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The algorithm for Dissipative Particle Dynamics (DPD), as modified by Español and Warren, is used as a starting point for proving an H -theorem for the free energy and deriving hydrodynamic equations. Equilibrium and transport properties of the DPD fluid are explicitly calculated in terms of the system parameters for…
A composite - 25% vol Teflon was prepared to prevent breakages in powder pellets due to the phase transition of and, thus, to study the effect of the phase transition on conduction. The composite microstructure, as followed by scanning electron microscopy, shows aggregated particles surrounded by Teflon regions which…
The observation of electron interference effects provides direct evidence of the coherence of the electrons emitted from a carbon nanotube. To demonstrate this, the low-energy electron point source microscope has been used to mount an individual carbon nanotube onto a tungsten tip. In subsequent experiments, the elect…
The metal - insulator (M - I) transition in conducting polymers is particularly interesting; critical behaviour has been observed over a relatively wide temperature range in a number of systems, including polyacetylene , polypyrrole (PPy), poly(p-phenylenevinylene) (PPV), and polyaniline (PANI). In each case, the meta…
Polycrystalline samples of the new semimagnetic semiconductor (x = 0.06, 0.12, 0.25, 0.39, 1.00, 1.40, 1.80) were obtained by ceramic technology. An x-ray diffraction experiment was performed on all of the samples at room temperature. These data provided the basis for Rietveld refinements. The refinements showed that…
It is widely believed that depletion force causes formation of colloidal crystal or flocculation in the stable colloidal suspension mixed with nonadsorbing polymers. This force works between a colloidal particle and plane, which can be regarded as a sphere with infinite radius. We report a novel technique that enables…
We present the thermal conductivity $(\ensuremath{\kappa})$ of several manganite perovskite compounds at temperatures 10--350 K and fields up to 6 T. In the metallic phase, $\ensuremath{\kappa}$ behaves as expected for a crystalline solid. In the high-temperature insulating phase, however, $d\ensuremath{\kappa}/dT>…
We describe and demonstrate a new class of devices that enable direct thermal conductance measurements on monocrystalline nanostructures. These are possible through our newly developed techniques for three-dimensional, successive surface nanomachining of GaAs-based heterostructures. Our methods allow the patterning of…
The temperature ( $T$) dependent dc conductivity ( ${\ensuremath{\sigma}}_{\mathrm{DC}}$) (down to 20 mK) and dielectric function at optical frequencies (0.002--6 eV) and 6.5 GHz are used to probe the inhomogeneous disorder-driven insulator-metal transition in conducting polymers. A correlation between large low $T$ $…
A nucleation picture of magnetization switching in single-domain ferromagnetic nanoparticles with high local anisotropy is discussed. Relevant aspects of nucleation theory are presented, stressing the effects of the particle size on the switching dynamics. The theory is illustrated by Monte Carlo simulations and compa…
Raman characterization of aligned carbon nanotubes of average diameter 10–15 nm, produced by chemical vapor deposition on a mesoporous substrate, has been carried out. The resonance behavior and higher-order Raman bands up to fourth order have been observed and compared with those of carbon nanotubes produced by arc d…
A new jet-cooked starch—oil composite has been blended with a polyester polyol and then reacted with isocyanate to give a polyurethane foam. Infrared spectroscopy and microscopy have been used to examine the resultant products. Infrared spectra have shown the products contain the urethane structures and light and elec…
The structure development and mechanical properties of blow extruded polypropylene containing β-phase nucleating additives was studied. Quinacridone red and cadmium red were both found to nucleate the β phase in polypropylene, the former being a much more efficient nucleator than the latter. The β-phase spherulites fo…
Nach dem Vorbild der Natur entstand die dem natürlichen Mineral Cetineit verwandte Phase 1 , die mit ihrer nanoporösen, templatfreien Wirtstruktur ein ideales Studienobjekt für zahlreiche Untersuchungen ist. So lassen sich an diesem nanostrukturierten Halbleitermaterial elektronische Anregungs‐ und Transportprozesse u…
A description as a composite of CU2TeS3 and CuI is possible for (CuI)3Cu2TeS3, the first representative of a series of compounds formed by complex chalcogenometalate ions and copper(I) halides. The (TeS3)2− groups are oriented in parallel columns between layers of iodide ions (section of the crystal structure depicted…
In this study, thermal and microscopic analyses were used to evaluate a variety of carbonate and bicarbonate salts (alkali, alkaline—earth, and other metals), having different thermal stability within the range of poly(ethylene terephthalate) (PET) processing temperatures, as nucleating agents for recycled bottle PET.…
Tausende einzelner Metall‐Nanokristalle mit einem Durchmesser von 2.5 nm bilden die in der rasterelektronenmikroskopischen Aufnahme rechts gezeigten fünf Partikelringe, von denen jeder einen Durchmesser von etwa 1 μm hat. Hier wird eine experimentelle und theoretische Erklärung für die Bildung derartiger Ringe vorgest…
Blends of polystyrene (PS) and polybutadiene (PBD) were investigated by differential scanning calorimetry. From the phase composition diagram of the blends, it appears that PBD dissolves more in the PS-rich phase than does PS in the PBD-rich phase. This result is consistent with the behavior of the specific heat incre…
To improve the mechanical properties and structure of HDPE/CaCO3 composites, a type of modifier, consisting mainly of carboxylated polyethylene (CPE), and a type of CaCO3 grafted with acrylamide (CaCO3(SINGLE BOND)A) were used. The carboxyl group content of CPE was from 1 to 10%. The amide group content on the surface…
Unprecedented structural and compositional features are exhibited by these large vanadium borate clusters (for example 1, see picture on the right). Facile solubilization and crystallization of transition metal oxides by these large, multidentate polyborate ligands portends a rich and diverse chemistry for transition…