Materials Literature
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A comprehensive discussion on the flammability of organic-inorganic nano-composites is presented based on different fire testing methods. Based on various flammability tests, reduced peak heat release rate, an increased oxygen index, and an enhanced thermal stability were observed, while faster burning rates were foun…
Single phase powders of BaTi2O5 and Ba6Ti17O40 were made by a sol-gel method with final heating at 1100–1200°C. Ceramic samples were prepared and fired at temperatures in the range 1100–1300°C. Both sets were highly insulating, with conductivities of, e.g., 10−6–10−7Scm−1 at 600°C and activation energies for conductio…
Abstract Summary: Blends of polyamide‐6 (PA6) and low density polyethylene (LDPE) were compatibilized by melt mixing with various polyolefins functionalized with glycidyl methacrylate (GMA), i.e., GMA grafted LDPE (LDPE‐ g ‐GMA), GMA grafted styrene‐ethylene/butylene‐styrene block copolymer (SEBS‐ g ‐GMA) and ethylene…
Ceramics of composition Bi3TiNbO9 (BTN) and perovskite-layered structure (Aurivillius type) [B. Aurivillius, Ark. Kemi 1, 463 (1949)] were processed by natural sintering and hot pressing from amorphous precursors. Precursors were obtained by mechanochemical activation of stoichiometric mixtures of oxides. These materi…
Analytical ultracentrifugation (AU) provides a general way to probe the polydispersity of nanoparticles and the formation of bioconjugates in solution. Unconjugated gold nanocrystals show sedimentation coefficient distributions that are in agreement with size distributions as measured by TEM. AU is sensitive to the si…
Dielectric response and electrical conduction properties of 0.94Pb(Fe1∕2Nb1∕2)O3–0.06PbTiO3 single crystals grown by the Bridgman method were studied. It was found that the single crystals did not show any sign of the presence of Curie temperature between room temperature and 300 °C. However, they exhibited very high…
Abstract Poly(ethylene terephthalate) (PET) and PET/montmorillonite(MMT) (2.5 wt %) nanocomposites with high molecular weight were prepared by solid‐state polycondensation and their fiber was spun and drawn under various conditions. The influence of MMT nanomaterials on the thermal shrinkage of PET fiber was investiga…
Effects of pulsed and continuous light illumination on field emission from CuO nanobelt arrays have been studied by using a transparent anode technique. It is found that, at low-field emission current level, the field emission current generally increases under a pulsed irradiation; at an emission current level of 1.1μ…
We report the bulk magnetic properties of hole-doped ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ $(0\ensuremath{\leqslant}x\ensuremath{\leqslant}0.14)$ in the paramagnetic and antiferromagnetic regions; the ${\mathrm{Mn}}^{4+}$ concentration was determined with chemical analysis. Significant…
Polymer networks made from oligo[( l -lactide- ran -glycolide)]dimethacrylates by UV curing are characterized by solid-state NMR. These polymer networks show a shape-memory effect and could be used as temporary implant materials for medical applications. The 13 C spectra enable the direct determination of the cross-li…
Raman scattering at room temperature is reported in Zn1−xMnxO nanoparticles for the range of 0⩽x⩽0.15. The effect of compositional disorder is obtained by analyzing the broadening and asymmetry of the first-order E2(high) phonon mode. It is found that the Raman line shapes for the ZnO E2(high) phonon in Zn1−xMnxO allo…
We clarified the adsorption sites inside the single-wall carbon nanohorns (SWNHs), a type of single-wall carbon nanotubes having thick diameters of 2-5 nm, through the thermogravimetric analysis of the desorption of xylene and benzene from SWNHs. The influence of the sizes of holes piercing through the SWNH walls was…
Magnetotransport properties of La1−xCaxMnO3 (x=0.33, 0.5) thin films on different substrates are systematically studied. Due to the different lattice-substrate mismatch between films and substrates, compressive, and tensile epitaxial strain can be induced, respectively. The structure distortion induced by the strain w…
A magnetic route has been applied for measurement of the average oxidation state (AOS) of mixed-valent manganese in manganese oxide octahedral molecular sieves (OMS). The method gives AOS measurement results in good agreement with titration methods. A maximum analysis deviation error of +/-7% is obtained from 10 sampl…
The binding sites and vibrational frequencies ω of H in ZnO are studied by first-principles total-energy calculations. In the past, different experiments have observed different primary H vibrational modes, making the comparison with theory, and hence the identification of the most favorable H site, difficult. Here, w…
1‐D (one‐dimensional) nanocarbon materials possess unique properties. However, they could become airborne and reach the lungs. In the present study the pulmonary toxicity of nanotubes was investigated. Guinea pigs were intratracheally instilled with different nanotubes and inflammatory response was measured. The resul…
We report on the fundamental electrochemical properties of inherently hydrophobic Multiwalled Carbon Nanotubes MWNT electrodes and acid treated MWNTs. The electrochemical response of the electrodes was investigated by cyclic voltammetry and ac impedance spectroscopy using the redox probe of (Fe(CN)6 3−/Fe(CN)6 4−, whi…
The processes of electro- (EL) and photoluminescence (PL) and charge trapping in Er-implanted SiO2 containing silicon nanoclusters have been studied. It is shown that in Er-doped SiO2 with an excess of silicon nanoclusters of 10 at. %, a strong energy transfer from silicon nanoclusters results in a ten-fold increase o…
Abstract We report the preparation and characterization of a series of novel electrochromic, aromatic poly(amine amide)s with pendent triphenylamine units. The synthesis proceeded via direct phosphorylation polycondensation between a novel diamine, N , N ‐bis(4‐aminophenyl)‐ N ′, N ′‐diphenyl‐1,4‐phenylenediamine, and…
We present ab initio density-functional and self-interaction-corrected calculations on the structure, long-wavelength vibrational modes, and static dielectric properties of the crystalline high-$\ensuremath{\kappa}$ distorted-perovskite oxide ${\mathrm{LaAlO}}_{3}$. The orientationally averaged dielectric constant $\e…