Materials Literature
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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…
A method for simultaneously thermostatting an atomistic region and absorbing energetic pulses impinging on the atormstic/continuum interface from the atomistic region is developed to operate within the framework of the coupled atomistic/discrete dislocation method. The approach inserts an additional Langevin damping t…
Flower-shaped ZnO nanostructures were grown on Si(100) and Si(111) substrates by cyclic feeding chemical vapour deposition without the use of a metal catalyst. The structures obtained on the Si(100) substrate exhibited triangle-shaped leaves with lengths and diameters in the ranges 300-400 and 90-130 nm, respectively.…
Fiber surface-enhanced Raman scattering (SERS) sensors show great potential for in vivo and in vitro detection. However, current probes based on end-polished fibers suffer from small signal due to their small active region. To overcome this, we propose and demonstrate a D-shaped fiber configuration to increase the det…
We report on the fracture behavior of nanoporous (np)-Au with an open sponge-like morphology of interconnecting ligaments on the nanometer length scale. Despite its macroscopic brittleness, np-Au is microscopically a very ductile material as ligaments strained by as much as 200% can be observed in the vicinity of crac…
Possibilities to realize a negative refraction in chiral composites in in dual-phase mixtures of chiral and dipole particles is studied. It is shown that because of strong resonant interaction between chiral particles (helixes) and dipoles, there is a stop band in the frequency area where the backward-wave regime is e…