Materials Literature
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Electrical conductivity, Seebeck coefficient, and nonstoichiometric oxygen content of La2-xSrxNiO4+δ (x = 0, 0.2, 0.4) were measured as a function of Sr content, temperature, and oxygen partial pressure. At above around 873 K, mobility of hole decrease as temperature increase. The temperature dependence of hole mobili…
We report the epitaxial growth and physical properties of Eu0.5Sr0.5CoO3 (ESCO) thin films deposited on (001) LaAlO3 (LAO) and (001) SrTiO3 (STO) substrates by off-axis rf sputtering. The magnetic properties of a grown film are governed by the crystallinity of the thin film and strain effects due to the substrate. The…
To investigate carbon deposition on Ni anode for solid oxide fuel cells, in situ microscopic observation was performed, Carbon deposition and oxidation was successfully observed by in situ Raman microscopy combined with electrochemical setup. It is generally believed that carbon deposition is determined by steam / car…
Understanding the performance volatility of carbon nanotube-based devices will expedite their applications. We performed in situ electrical and Raman scattering studies on an individual semiconducting single-walled carbon nanotube in the field-effect transistor geometry under different ambient and temperatures. The Ra…
The structure and conductivity of cerium and lanthanum phosphate glasses and glass-ceramics were investigated. The effects of varying the metal to phosphate ratio in the glasses, doping LaP3O9 glasses with Ce, and recrystallization of CeP3O9 glasses, on the glasses' microstructure and total conductivity were investiga…
We present the realization of an electrically tunable wave plate, which uses a nematic liquid-crystal (LC) phase retarder that allows fast and continuous control of the polarization state. This device is built using a quadripolar electrode design and transparent conductive polymer layers in order to obtain a uniform e…
The $E(J)$ characteristics of well-characterized fully strained epitaxial ${\text{La}}_{0.7}{\text{Sr}}_{0.3}{\text{MnO}}_{3}$ films have been investigated up to high current densities $(J\ensuremath{\sim}{10}^{4}--{10}^{5}\text{ }\text{A}/{\text{cm}}^{2})$. Different electric contact resistances and different current…
The crystal structures and characterizations of Ba(4)EuM(3)O(12) (M = Ru and Ir) are reported. They crystallize in a monoclinic 12-l-perovskite-type structure with space group C2/m. The M(3)O(12) trimers and EuO(6) octahedra are alternately linked by corner-sharing and form the perovskite-type structure with 12 layers…
The equilibrium structure, electronic, and magnetic properties of ${\text{Ni}}_{3n}{\text{Al}}_{n}$, $(n=1,\text{ }8)$ clusters are investigated using ab initio total-energy calculations based on density functional theory. Asymmetric and amorphous structures are observed for $n>1$ clusters, in contrast with the ear…
The authors report on a complex diffraction efficiency dynamics of the holographic grating recording process in azobenzene-functionalized polymer for a long recording time. The nonexponential dynamics was explain by the mechanism which assumes (i) simultaneous formation of three coupling phase gratings with constant,…
Zinc nitride (ZnN) films were prepared by electron beam evaporation technique. The effect of heat treatments on the structural and optical properties of these films were studied. The as-deposited films show amorphous structure and some peaks which are related to Zn3N2 and ZnO can be observed for annealed films. The st…
We report on the grafting-from living cationic polymerization of isobutylene from SiO 2 -nanoparticles surfaces. After modification of the NP-surfaces (SiO 2; 6 nm) initiators (I) for the cationic polymerization of isobutylene (IB) were grafted onto the NP surface in variable densities (0.1−0.85 molecules initiator/nm…
Rice straw (Oryza sativa L.) pulp was treated by high intensity ultrasonication to make fibrils. The rice straw fibril (RSF) material was used as reinforcement in an RSF/polypropylene (PP) composite. The influences of RSF and coupling agent (MAPP) contents on tensile properties of the composite were tested. The result…
Asymptotic methods are used to analyse a recent numerical model for the electrochemical pickling of steel. Although the process is characterized by an excess of supporting electrolyte, the asymptotic structure of the solution turns out not to be the same as that given classically for such situations. In the original t…
Epitaxial films of LaFeO3 (LFO) were grown on SrTiO3(001) (STO) substrates using pulsed laser deposition. Two epitaxial orientations were observed: α where LFO(110)∥STO(100) and β where LFO(001)∥STO(100). By controlling the deposition conditions, LaFeO3 films could be grown with just the α orientation or with simultan…
A study of the free energy of the perovskite manganites was performed by fitting experimental results for the temperature dependence of the crystal cell volume using a detailed semiclassical model of the free energy. The fitted results coincide with the experimental results for the samples La1−xCaxMnO3 (x=0.2, 0.25, 0…
Abstract Differential scanning calorimetry (DSC) was employed to investigate the thermal properties of segmented aliphatic poly(ester amide)s (PEA)s. Three different series of PEAs were synthesized, each containing amide blocks of defined lengths which are randomly placed in the poly(butylene adipate) (PBA) backbone.…
Multifunctional hyperbranched oligo(fluorene vinylene) ( HOFC ) containing pendant crown ether was synthesized from 2,4,7-trivinyl-9,9-dihexylfluorene and 2,7-dibromo-9-(15-crown-4)-9 H -fluorene via Heck coupling reaction. Their chemosensory, photophysical, and electrochemical properties were investigated and compare…
Carbon-based nanostructures continue to attract a disproportionate share of research effort because of their wide range of properties. This research includes synthesis techniques and controlling the structure and morphology of nanomaterials, since for many applications tedious manipulations are often required. One of…
A procedure is proposed for generating rigorous closed-form orthonormal bases for the expansion of strongly focused (high-numerical-aperture), monochromatic, electromagnetic fields. The performance of three such bases is tested in terms of a parameter that determines their directional spread, for several truncation or…