Materials Literature
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Diffusion coefficients of limonene in various linear low-density polyethylene (LLDPE) and low-density polyethylene (LDPE) resins have been determined from sorption data using a thermogravimetric methodology. From these data, one can determine whether polymer synthesis parameters such as the choice of catalytic process…
We report for the first time the formation of a new phase in a supercooled liquid molecular compound 2-biphenylmethanol by differential scanning calorimetry and x-ray diffraction measurements. It is found that at a crossover temperature T c ∼1.2 T g within a supercooled liquid metastable clusters (nuclei) start to app…
The deposition and coating of GdVO4:Eu3+ nanoparticles on spherical silica was carried out using a simple sol–gel method at low temperature. The GdVO4:Eu3+-coated silica composites obtained were characterized by differential thermal analysis (DTA), thermogravimetric (TG) analysis, x-ray diffraction (XRD), Fourier-tran…
The electrical properties of carbon microcoils (CMCs)/ silicone-rubber composites were studied on the changes in the values of the electrical parameters (impedance, phase angle, resistance, and capacitance) as a function of the CMC content in the matrix, using an impedance analyzer in the frequency range from 40to200k…
One-dimensional (1D) semimetals (e.g., antimony and bismuth) are excellent thermoelectric materials. We demonstrate the self-assembly of 1D Sb nanowires on highly oriented pyrolytic graphite, along with structures of other dimensionality. Comparing with an Sb crystal in ambient condition, our scanning tunneling micros…
The low-frequency dielectric response of thin-film and bulk ferroelectric or relaxor heterostructures was analysed. For epitaxial crystallographic strain-free thin films of ferroelectric (Ba,Sr)TiO 3 and relaxor PbMg 1/3 Nb 2/3 O 3 , more experimental data supporting the interface layer model were obtained. The combin…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Qiyu Huang, Whye-Kei Lye, Michael L. Reed; Observation of isolated nanopores formed by patterned…
The dielectric permittivity and loss spectra of glassy and liquid states of nicotine have been measured over the frequency range 10−2–109 Hz. The relaxation spectra are similar to common small molecular glass-forming substances, showing the structural α-relaxation and its precursor, the Johari–Goldstein β-relaxation.…
We report strongly enhanced thermoelectric characteristics for a misfit-layered oxide, [Bi2Ba2O4±ω]0.5CoO2, in a wide temperature range, as achieved through substituting up to 20% of Bi by Pb. The Pb substitution kept the thermal conductivity (κ) unchanged but decreased the electrical resistivity (ρ) and increased the…
Porphyrins with fluorenyl and fluorenone groups at the meso -positions, and their Zn(II) complexes have been synthesized and characterized by 1 H NMR, UV–visible and fluorescence studies. Following selective excitation of the pendant arms with UV light, the energy is transferred to the porphyrin core and reemitted as…
Double-walled carbon nanotubes (DWNTs) were synthesized used carbon black as the dot carbon source by a semi-continuous hydrogen arc discharge process. High-resolution transmission electron microscopy (HRTEM) observations revealed that most of the tubes were DWNTs with outer and inner diameters in the range of 2.67–4…
Isocitrate dehydrogenase (IDH) from the hyperthermophile Thermotoga maritima (TmIDH) catalyses NADP+- and metal-dependent oxidative decarboxylation of isocitrate to alpha-ketoglutarate. It belongs to the beta-decarboxylating dehydrogenase family and is the only hyperthermostable IDH identified within subfamily II. Fur…
The dependence on composition and loading direction of the strength of nanocrystalline α-Fe2O3+fcc-Al composites is analyzed using molecular dynamics simulations with a recently developed multicomponent interatomic potential. Compressive strength values are found to be higher than the tensile strength values at all vo…
Low-temperature plasmas of methane and oxygen mixtures were used to treat diamond nanoparticles to modify their surface characteristics and thus improve their dispersion capability in water. It was found that the plasma treatment significantly reduced water contact angle of diamond nanoparticles and thus rendered the…
We have grown epitaxial films of La0.67Sr0.33MnO3 (LSMO) and La0.67Ca0.33MnO3 (LCMO) on single crystalline LaAlO3 substrates by a cost effective polymer-assisted deposition technique. Film crystallinity, microstructure, resistivity, magnetization, and magnetoresistance (MR) were highly dependent on the annealing tempe…
Employing frequency-dependent dielectric susceptibility we characterize the aging in two supercooled liquids, sorbitol and xylitol, below their calorimetric glass transition temperatures. In addition to the alpha relaxation that tracks the structural dynamics, the susceptibility of both liquids possesses a secondary J…
It is shown that traces of 2,4,6-trinitrotoluene (TNT) display strong and distinct structures in differential reflectograms, near 420 and 250nm. These characteristic peaks are not observed from moth balls, nail polish, polyvinyl chloride, starch, soap, paper, epoxy, aspirin, polycarbonate, aspartame, polystyrene, poly…
We report on the enhancement of the mechanical properties of single wall carbon nanotube (SWNT)-polyvinyl alcohol (PVA) composites through functionalization of SWNTs with denatured collagen. In addition to improving compatibility with the matrix, the denatured collagen layer was found to increase the PVA matrix crysta…
Movements of ferroelastic 90° a -domains (twins) of sub-100 nm lateral size contribute greatly to the dielectric, piezoelectric, and elastic properties of ferroelectric materials. However, in thin films the mobility of twins is severely limited due to substrate clamping and pinning of domain walls. Here we demonstrate…
We report the magnetotransport properties of the heterojunction composed of La0.82Ca0.18MnO3 (LCMO) and 0.5wt% Nb-doped SrTiO3 (SNTO). At temperature below 120K, the heterojunction only exhibits a negative magnetoresistance (MR) independent of bias current. At temperatures above 120K, with increasing bias current a cr…