Materials Literature
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Quasi-aligned ZnCdO single-crystal nanorods were prepared for the first time by using thermal evaporation of Zn and CdCl2 on a Si substrate with the presence of Au catalyst. The maximum Cd content was up to about 16.7at.%, which was significantly larger than the thermodynamic solid solubility limits. The ZnCdO nanorod…
Atomic-scale electromigration (EM) in unpassivated copper metal lines was directly observed in ultrahigh vacuum at room temperature by transmission electron microscopy. It was found that copper atoms on a (211) crystal plane vanished directionally within half an hour when applying an electric current with a density of…
Selective and independent dimerization of tri- and tetraurea derivatives was used to build up dendritic assemblies which are uniform in size and structure. Dendrimers with the total molecular masses of about 25 000 g/mol were obtained. The existence of uniform assemblies was proved by 1H and 1H DOSY NMR experiments an…
Boron nitride (BN) nanorings were synthesized using a sulfur vapor assisted solid-state method at 600 degrees C. The rings had typical diameters of 100-300 nm, and the shells were 5-20 nm thick and about 50 nm wide. On the basis of the characterization of X-ray powder diffraction pattern (XRD), X-ray photoelectron spe…
Abstract Methoxy poly(ethylene glycol)‐ b ‐poly( L ‐lactic acid) (MPELLA) was prepared by the melt polycondensation of methoxy poly(ethylene glycol) and L ‐lactic acid. The structure and properties of MPELLA were characterized by IR, 1 H‐NMR, differential scanning calorimetry, and wide‐angle X‐ray diffraction. To esti…
We report on the study of some new derivatives of the complex perovskite CaCu 3 Mn 4 O 12 . Ca 2+ cations can be replaced by rare earths in the RCu 3 Mn 4 O 12 (R = rare earths) family, implying an electron doping effect that dramatically affects the magnetic properties. These compounds must be prepared under high pre…
Abstract The melting behavior and nonisothermal crystallization kinetics of pure polyamide 6 (PA 6) and its molecular composites with polyamide 66 (PA 66) were investigated with differential scanning calorimetry. The PA 6/PA 66 composites had one melting peak, whereas the coextruded PA 6/PA 66 blends had two melting p…
An analytical algorithm is proposed to describe the buckling behaviour of multi-walled carbon nanotubes (CNTs) that are embedded in a matrix with consideration of the van der Waals (vdW) interaction. The individual tube is treated as a cylindrical shell, but the tube deflections are coupled with each other due to the…
Abstract Blending is a very effective method for manufacturing new polymeric materials; however, the process used to combine two polymers can influence the physicochemical properties of the final product. As such, the aim of this study was to investigate how the rapid removal of a solvent from a composite by the spray…
Random and block copolymers of 4-[2-(vinyloxy)ethoxy]azobenzene (AzoVE) and various vinyl ethers (exhibiting LCST-type phase separation) were prepared by living cationic polymerization using 1-(isobutoxy)ethyl acetate/Et1.5 AlCl1.5 in the presence of ethyl acetate at 0 °C. With random copolymers having thermally-respo…
A thermal interface material (TIM) is a crucial material for transferring heat from a die to a heatsink. We developed a new TIM composed of carbon nanotubes, silicon thermal grease, and chloroform. The thermal impedance of the TIM was measured using a new device based on thermometer principles to measure thermal imped…
Ni nanoparticle evaporation onto highly oriented pyrolytic graphite (HOPG), with low and high surface defect densities, has been studied in situ by X-ray photoelectron spectroscopic (XPS) techniques, including binding energy shifts, Auger parameters, and Wagner plots. Ni nucleates at defect sites, whether initially pr…
In order to identify all pairs of polymorphs in the Cambridge Structural Database (CSD), a method was devised to automatically compare two crystal structures. The comparison is based on simulated powder diffraction patterns, but with special provisions to deal with differences in unit-cell volumes caused by temperatur…
Macroporous poly(styrene- co -divinylbenzene) microparticles from reactive mixtures with various divinylbenzene and diluent contents have been synthesized. n -Heptane, which is a poor solvent for the copolymer, was used as diluent of the organic phase during the polymerization to obtain a high percentage of meso- and…
A large-scale single-crystalline ZnO hexangular prism was successfully synthesized through a simple gamma-irradiation method at room temperature and under ambient pressure. The product of a ZnO hexangular prism with a rim of 230 +/- 10 nm and a length up to 8.5 microm was well monodisperse and showed a very strong and…
Abstract A set of novel aromatic polyamides containing pyridine pendent groups was prepared from aromatic diamines and new monomers that are 5‐substituted derivatives of isophthalic acid bearing nicotinamide, isonicotinamide, or picolinamide groups. The polymers were obtained in high yield and high molecular weight by…
We present a quantitative theory for ferromagnetism in diluted III-V ferromagnetic semiconductors in the presence of the two types of defects commonly supposed to be responsible for compensation: As antisites and Mn interstitials. In each case we reduce the description to that of an effective random Heisenberg model w…
Surface immobilized polyamidoamine (PAMAM) dendrimer templated Pt nanoparticles were employed as precursors to heterogeneous catalysts. CO oxidation catalysis and in situ infrared spectroscopy were used to evaluate conditions for dendrimer removal. Infrared spectroscopy showed that PAMAM dendrimer amide bonds begin de…
Control of the size, shape, and structure of mesoporous transition metal oxide materials is important in their correlations with corresponding optoelectronic and photocatalytic properties. Highly ordered cubic phases of mixed-valent mesoporous molybdenum oxides have been prepared by the reduction and decomposition of…
Abstract Rubber compounds are reinforced with fillers such as carbon black and silica. The cure characteristics of a filled rubber compound vary with the filler type and content. The influence of the type of carbon black on the cure characteristics of carbon black filled natural rubber compounds is investigated using…