Materials Literature
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The piezoelectric effect in ferroelectric single crystals and ceramics is investigated considering intrinsic (lattice), and extrinsic (originating mainly from displacement of domain walls) contributions. The focus of the study of intrinsic properties is on piezoelectric anisotropy, which was examined using the Landau–…
The electronic properties of ZnO have traditionally been explained by invoking intrinsic defects. In particular, the frequently observed unintentional n-type conductivity has often been attributed to oxygen vacancies. We report first-principles calculations showing that the oxygen vacancy VO is not a shallow donor, bu…
Abstract New nonlinear‐laser properties of the non‐centrosymmetric cubic crystals CsLiMoO 4 and CsLiMoO 4 ·⅓H 2 O were studied by stimulated Raman scattering spectroscopy (SRS). Multiple Stokes and anti‐Stokes generation sidebands in the visible and near‐IR under picosecond laser pumping have been observed for the fir…
Abstract Sr 2 MgSi 2 O 7 :Eu 3+ nanotubes with red phosphor luminescent properties were successfully synthesized via a low‐temperature hydrothermal route in order to understand the underlying relationship between shape and luminescent properties. The one‐dimensional shape results in an obvious improvement of color pur…
This paper describes a gain-scheduled controller for a shape memory alloy (SMA) actuator. For accurate control of an SMA actuator, it is important to develop a precise model for the SMA. A model has been proposed based on concepts from physics. The equations include Joules heating - convectional cooling to explain the…
Scaled particle theory for a binary mixture of hard discorectangles and for a binary mixture of hard rectangles is used to predict possible liquid-crystal demixing scenarios in two dimensions. Through a bifurcation analysis from the isotropic phase, it is shown that isotropic-nematic demixing is possible in two-dimens…
Abstract Three series of semiflexible and rigid main‐chain polyesters containing photoreactive mesogenic units derived from p ‐phenylenediacrylic acid (PDA) and cinnamic acid have been synthesized by high‐temperature polycondensation. The thermal and mesomorphic properties of the polymers have been determined. The pho…
Abstract The aim of this study was on the one hand, to compare the fire behaviour of polyester/clay nanocomposites with that of the neat polymers added with the conventional flame retardant melamine isocyanurate (MIC) and on the other hand, to study the effect of the flame retardant added to the nanocomposites. Polyes…
We report an all-solid-state supercapacitor with device fabrication by a simple vacuum thermal evaporation method, which allows not only a multilayer stacking structure to further enhance the capacitance, but also permits the supercapacitor to be easily incorporated with other electronic devices, showing interesting c…
Theoretical studies available in the literature for investigating the quantum size effects in band-gap and luminescence properties have excluded lattice variations that may occur in the nanoscale regime. This work addresses the lattice dimensions of highly crystalline ZnO nanorods as a function of diameter. The corres…
Abstract Tris(β‐diketonato)europium( III ) complexes of general formula [Eu(TPI) 3 · L], with chelating ligands such as 3‐phenyl‐4‐(4‐toluoyl)‐5‐isoxazolone (HTPI) and adduct‐forming reagents [L = H 2 O, tri‐ n ‐octylphosphane oxide (TOPO), triphenylphosphane oxide (TPhPO), 1,10‐phenanthroline], have been synthesized…
Results of NMR studies of $^{23}\mathrm{Na}$ in $\mathrm{Na}\mathrm{N}{\mathrm{O}}_{2}$ confined within molecular sieves MCM-41 with pore size 37 and 20\AA{} and SBA-15 with pore size 52\AA{} are presented. $^{23}\mathrm{Na}$ spin-lattice relaxation and line shape were measured in a large temperature range up to 535 K…
Abstract Summary: New hyperbranched poly(arylene ether amides) with fluorine or hydroxy end groups were synthesized from AB 2 or A 2 B type monomers via a nucleophilic aromatic substitution (S N Ar) reaction. Monomer syntheses were facilitated by chemo‐selective amidation reactions, and even a direct synthesis of hype…
Abstract Cobalt( III ) corroles exhibit an infinite selectivity for the coordination of carbon monoxide towards dioxygen and dinitrogen. This peculiar property thus allows their use as sensing devices for CO detection. Here are described the syntheses and physico‐chemical characterization of meso mono‐, bis‐ and tris(…
Well-aligned ZnO nanowires were successfully synthesized on a silicon substrate at the low temperature of 550 degrees C by catalyst-free vapour phase deposition. The ZnO nanowires had diameters in the range of 70-100 nm and lengths over several tens of micrometres. The synthesized ZnO nanowires, which had a single-cry…
Microstructures that emerge during the crystallization of amorphous materials depend on nucleation and growth kinetics. The ability to predict these final microstructures, particularly the average grain size, would allow better control of material properties. Well-established crystallization theories have proposed mat…
Prefaces. PART I: INTRODUCTION. Geometry of crystal lattice. PART II: CLASSICAL DYNAMICS OF A CRYSTAL LATTICE. Mechanics of a one-dimensional crystal. General analysis of vibrations of monoatomic lattices. Vibrations of polyatomic lattices. Frequency spectrum and its connection with the Green's function. Acoustics of…
Vertically well-aligned and epitaxial ZnO nanorod arrays (NRAs) were synthesized by catalyst-free metalorganic chemical vapor deposition on Al2O3 (0001) substrates particularly using an epitaxially grown GaN buffer layer. ZnO NRAs grown directly on Al2O3 (0001) substrates are aligned vertically, but randomly oriented…
The influence of high pressures of carbon monoxide (CO) on the stability of a Au/Ni(111) surface alloy has been studied by high-pressure scanning tunneling microscopy. We show that CO induces a phase separation of the surface alloy at high pressures, and by means of time-lapsed STM movies we find that Ni atoms are rem…
Nanoindentation study of a single poly(L-lactic acid) nanofiber produced by the phase separation method was performed using an atomic force microscope (AFM) cantilever tip. Issues concerning the use of AFM for nanoindentation of polymer nanofibers were discussed. The Hertz theory of contact mechanics was used to analy…