Materials Literature
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Abstract The existence of single‐wall carbon nanotubes (SWNTs) in organic solvents, in the form of clusters, is discussed. A theory is developed based on a bundlet model for clusters, describing the distribution function of clusters by size. The phenomena have a unified explanation in the bundlet model of clusters, in…
Abstract In this article, we assess the ability of common molecular descriptors issued from quantum chemistry calculations (geometrical parameters, atomic charges, isodesmic energies, polarizabilities, and descriptors from conceptual DFT) to predict the butene selectivity in the mixed (P,N)‐nickel(II) catalyzed ethyle…
Negative capacitance has been observed in conducting polymer nanowires. These nanowires exhibit features of one-dimensional Wigner crystals, such as switching transition that reduces resistance by several orders of magnitude, negative differential resistance, and enhancement of noise in the switched state. Negative ca…
Abstract A standard sol‐gel method was used to deposit ZnO thin films of suitable thickness on glass substrate.The optical characteristics of the visible to infrared range on thermal stress were critically observed. Morphological signature of the films was detected by X‐ray diffraction (XRD) and the crystallite size d…
Characteristics of phase transitions of lead barium niobate compositions around the morphotropic phase boundary were investigated. Using structural characterizations, it was found that the morphotropic phase boundary extends toward a wide composition range, in which both tetragonal (4mm) and orthorhombic (m2m) tungste…
External field-induced phase transition in the lanthanum-doped lead zirconate titanate stannate antiferroelectric ceramics near morphotropic phase boundary were studied as a function of electric field and temperature. Upon application of an electric field to the antiferroelectric ceramics that was larger than the fiel…
The anomaly in dielectric constant versus temperature plot, around the Néel temperature TN (∼150 K), is found to be frequency dependent in a single crystal of bilayer manganite Pr(Sr0.1Ca0.9)2Mn2O7. The anomaly in the permittivity (ε′∥c) occurs at a temperature Tf which moves within a temperature window (ΔTf) of ∼40 K…
We theoretically investigate multifrequency cloak based on multishell by using transformation medium. As for each shell, we use the Maxwell–Garnett theory and the spectral representation theory to design the permittivity profile for the transverse magnetic wave. The plasma frequencies of the metals used in the inner (…
Influence of thermal annealing on electroluminescence (EL) from multiple-Si-implanted silicon nitride films has been investigated. A reduced injection current and an enhanced EL intensity have been obtained simultaneously by increasing the annealing temperature, which results in a higher EL quantum efficiency. In addi…
Abstract The ability of a ceramic to resist penetration by projectiles depends, in a coupled manner, on its confinement and its mechanical properties. In order to explore the fundamental inter-relationships, a simulation protocol is required that permits the microstructure and normative properties (hardness and toughn…
Summary Sericin is a natural silk protein which is removed from silk in a process called degumming. Thus, finding a use for the extracted sericin as a biopolymer film will create added value which will benefit both the economy and society. It was found that extracted sericin could not form stand‐alone films. Therefore…
In this work, an X-ray Absorption Spectroscopy (XAS) measurement was employed to determine the local structure of Mn in BaTiO 3 . A combination of Synchrotron X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) experiments was performed on Mn-doped BaTiO 3 samples. The BaT…
Abstract In order to understand the influence of crucible geometry combined with natural convection and Marangoni convection on melt flow pattern, temperature and pressure fields in silicon Czochralski crystal growth process, a set of numerical simulations was conducted. We carry out calculation enable us to determine…
Perovskite oxide Pb(Fe1/2Nb1/2)0.52Ti0.48O3 crystals, which were grown using a modified Bridgman method, show a high low-frequency dielectric constant response at room temperature. The Curie phase transition occurs at 523 K. The characteristic frequency of the dielectric dispersion versus the inverse of temperature ob…
Abstract Both MM3 and semi‐empirical electronic structure calculations were performed for studying different conformations of PANI oligomers. The results were compared with experimental findings and analyzed to predict the relationship among individual conformations of single PANI chains, structures of packed PANI bas…
Abstract The recovery behaviors of vulcanized natural rubber from circular deformation were studied by varying sample length to investigate the influence of the degree of applied strain to the sample. The stress and strain varied uniformly across the thickness of the sample, and the degree of applied stress and strain…
Abstract The modeling of thermal decomposition process of ten natural fibers commonly used in polymer composite industry was performed by assuming a global model occurring within the entire degradation range with consideration of fiber as one pseudocomponent. Málek method with activation energy values previously obtai…
Micron-crystalline diamond (MCD) films with a unique microstructure were synthesized using a modified nucleation and growth process, in which a thin layer of ultrananocrystalline diamond (UNCD) was used as nucleation layer for growing diamond films in H2-plasma. Thus obtained (MCD)UNCD diamond films consist of nanosiz…
Abstract Filmvorstellung : Dünne Filme, die durch exponentielles Schichtenwachstum erzeugt wurden, zeigen hohe Diffusivitäten und lassen sich leicht mit anorganischen Nanopartikeln infiltrieren. Die Filme können molekulare Systeme abhängig von der Schichtzusammensetzung aus Lösungen sequestrieren und liefern oberfläch…
In this paper we investigated the most important family of proton conducting oxides, i.e., cerates, by means of neutron diffraction and of pair distribution function analysis (PDF). The paper describes the structural effects of Y-doping and water incorporation in cerates proton conductors from a viewpoint of the avera…