Materials Literature
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Down to the wire: PtII⋅⋅⋅PtII interactions provide the cohesive driving force for the construction of micro- and nanometer-scale luminescent wires, such as nanowires of [Pt(CNtBu)2(CN)2] (see picture; Pt pink, N blue, C gray), which is a potential candidate for applications in nano-optical, electronic, and sensory dev…
A combination of electron microscopy and theoretical calculations provides new insights into the structure, electronics, and energetics of point defects and vacancy lines in BN single-wall nanotubes (SWNT). We show that the point defects forming under electron irradiation in the BN SWNTs are primarily divacancies. Due…
We discuss the hysteretic behavior of the field-induced variations of the microwave surface resistance in superconductors in the critical state. Measurements have been performed in a bulk sample of Nb and a powdered one at different values of the temperature. We discuss a model, based on the Coffey and Clem theory, in…
The issues related to the structure refinement of Pb(ZrxTi1-x)O3 (PZT) solid solutions are discussed. Particular attention is paid on the modelling of the co-existing phases in the vicinity of the morphotropic phase boundary (MPB), where local symmetry is often significantly lower than the average symmetry. According…
A computer simulation has to be fast to be helpful, if it is employed to study the behavior of a multicomponent dynamic system. This paper discusses modeling concepts and algorithmic techniques useful for creating such fast simulations. Concrete examples of simulations that range from econometric modeling to communica…
The elasticity and piezoelectricity of zinc oxide $(\mathrm{ZnO})$ crystals and single layers are investigated from the first-principles calculations. It is found that a $\mathrm{ZnO}$ thin film less than three $\mathrm{Zn}\text{\ensuremath{-}}\mathrm{O}$ layers prefers a planar graphitelike structure to the wurtzite…
Abstract Composites of natural rubber (NR) and short pineapple leaf fiber (PALF) were prepared on a laboratory two‐roll mill. The influences of untreated fiber content and orientation on the processing and mechanical properties of the composites were investigated. The dependence of extent of orientation on fiber conce…
Abstract Polyacrylonitrile (PAN) was electrospun in dimethylformamide as a function of electric field, solution flow rate, and polymer concentration ( C ). The fiber diameter increased with C and ranged from 30 nm to 3.0 μm. The fiber diameter increased with the flow rate and decreased when the electric field was incr…
Nanofibers exist widely in human tissue with different patterns. Electrospinning nanotechnology has recently gained a new impetus due to the introduction of the concept of biomimetic nanofibers for tissue regeneration. The advanced electrospinning technique is a promising method to fabricate a controllable continuous…
Green to the core: CdxZn1−xSe alloy core nanocrystals are synthesized and overcoated with CdyZn1−yS to create core–shell nanocrystals with the ideal wavelength of emission for quantum dot light-emitting device (QD-LED) displays. These (CdxZn1−xSe)CdyZn1−yS core–shell nanocrystals are used to fabricate color-saturated…
Abstract Optically pure polylactides, poly( L ‐lactide) (PLLA) and poly( D ‐lactide) (PDLA), were blended across the range of compositions with poly(ε‐caprolactone) (PCL) to study their crystallization, morphology, and mechanical behavior. Differential scanning calorimetry and dynamic mechanical analysis (DMA) of the…
Abstract Electrospinning is a relatively simple method to produce submicron fibers from solutions of different polymers and polymer blends. The extensive application in future of electrospinning nanofibers is filtration. In this article, the filtration properties of electrospinning nanofibers were investigated. During…
Jet stream: Multi-walled carbon nanotubes grown by catalytic chemical vapor deposition were carboxylated in a two-step oxidation process. An aqueous dispersion of the functionalized nanotubes was dispensed using an inkjet printer to obtain electrically conductive patterns on paper and plastic surfaces (see picture). S…
The thermodynamical stabilities for the series of metal borohydrides $M{(\mathrm{B}{\mathrm{H}}_{4})}_{n}$ ($M=\mathrm{Li}$, Na, K, Cu, Mg, Zn, Sc, Zr, and Hf; $n=1--4$) have been systematically investigated by first-principles calculations. The results indicated that an ionic bonding between ${M}^{n+}$ cations and ${…
Quantum paraelectric SrTiO3 shows the ferroelectricity by the exchange of 16O for its isotope 18O. Raman scattering experiment is performed on the isotopically exchanged SrTi(O0.32 16 18O0.68)3 whose exchange rate is just below the critical exchange rate. Raman spectrum of ferroelectric soft mode in the paraelectric p…
Abstract : Polyimides (PIs) such as Kapton(R) are used extensively in spacecraft thermal blankets, solar arrays, and space inflatable structures. Atomic oxygen (AO) in low Earth orbit (LEO) causes severe degradation of Kapton(R). SiO(sub 2) coatings impart remarkable oxidation resistance and have been widely used to p…
K1−x Na x NbO3 is considered as an alternative system for lead-based functional ceramics widely used in transducers, sensors and actuators. In some applications however, the composites of electroactive ceramic and polymer, with low acoustic impedance and dielectric permittivity that can be tailored to various requirem…
Composition dependence of the Curie temperature in mixed ferroelectric-ferroelectric solid solutions with isomorphous crystalline lattices, like the perovskite solid solutions LiTaO3/LiNbO3 or PbZrO3/PbTiO3, has been analysed by means of a classical effective field approach using a two sublattice system. The observed…
The magnetoelectric coefficient, α = dE/dH, of different compositions of BaTiO3-CoFe2O4 composites was measured by using the dynamic method and also a new method developed in our laboratory which is based on pulsed magnetic fields. The values obtained by both methods are congruent, with the largest magnetoelectric coe…
Vertically aligned well-separated N-doped multiwalled carbon nanotubes (CNTs) were grown on a silicon substrate by plasma enhanced chemical vapor deposition (PECVD). Angular near-edge X-ray absorption fine structure (NEXAFS) was used to investigate the vertical alignment of as-grown CNTs. In addition, both individual…