Materials Literature
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The synthesis, structure, and optical and electrochemical properties of thiophene-containing hybrid calixphyrins are reported. The 5,10-porphodimethene type 14pi- and 16pi-S,N2,X-hybrid calixphyrins (X = NH, O, S) were prepared by acid-promoted dehydrative condensation between a thiatripyrrane and the corresponding 2,…
The homologous series of mesogenic (S)-4″[n-(perfluoroalkanoyloxy)hexyl-1-oxy]-4-(1-metylheptyloxy-carbonyl)terphenyl compounds exhibiting low temperature, wide range, near orthoconic antiferroelectric phase has been synthesized [1 Kula, P., Dabrowski, R., Kenig, K. and Chyczewska, D. 2006. New antiferroelectric compo…
The promising materials for applications are Antiferroelectric Liquid Crystals. Two dielectric modes were detected in AFLCs, as far [1 Lagerwall, S. T. 1999. Ferroelectric and Antiferroelectric Liquid Crystals, Wiley-VCH. [Crossref] , [Google Scholar], 2 Haase, W. 2003. St. Wróbel, Relaxation Phenomena, Springer-Verla…
The recent observation of a pressure-induced insulator to metal ($I\mathrm{\text{\ensuremath{-}}}M$) transition in pure ${\mathrm{LaMnO}}_{3}$ [I. Loa et al., Phys. Rev. Lett. 87, 125501 (2001).], opens the way to a study of the role of the orbital degrees of freedom on the electronic structure in a stoichiometric mat…
The products derived from thermal decomposition of NH 4, K, and Na dawsonites have structural memory; that is, the original mineral structure in ammonium form (NH 4 AlCO 3 (OH) 2 ) is recovered upon treatment of the oxide in aqueous (NH 4 ) 2 CO 3 solution under mild conditions at pH ∼ 10. The memory effect holds in a…
The influence of hydrogen passivation on luminescence-center-mediated excitation of ${\text{Er}}^{3+}$ in Er-doped Si-rich ${\text{SiO}}_{2}$ films with significantly different microstructures is studied. Photoluminescence measurements are presented for samples containing no detectable silicon nanocrystals (annealed a…
Halogen-containing polymers and copolymers have been discovered to provide excellent encapsulation matrixes for making bright and monodispersed phosphorescent nanoparticles. The phosphorescent nanoparticles exhibit strong phosphorescence with long lifetime and large Stoke shift under ambient conditions. The cross-link…
We calculate here the dielectric constant ϵ as a function of temperature for the AC* phase transition of a ferroelectric liquid crystal using a mean field model. Using the values of the polarization P and the tilt angle θ, calculated from the mean field model with the P2θ2 coupling for 4-(3-methyl-2-chlorobutanoyloxy)…
The temperature dependence of the polarization P and the tilt angle θ is calculated here in the presence of a constant electric field near the smectic AC* phase transition of a ferroelectric liquid crystal using a mean field model. We demonstrate here the temperature dependence of P and θ under some fixed electric fie…
Abstract Two grafted ethylene–octene copolymers [POEs; i.e., POE‐g‐maleic anhydried (MAH) and aminated POE (denoted by POE‐g‐NH 2 ) were used as compatibilizers in immiscible blends of thermoplastic polyurethane (TPU) and POE. The effects of the compatibilizers on the dynamic rheological properties and morphologies of…
Two homologous series of achiral banana-shaped liquid crystals with an asymmetric central core based on 1,6- and 1,7-dihydroxynaphthalene and with side wings containing Schiff's based moiety, N(1,7)-n-O-PIMB and N(1,6)-n-O-PIMB (n = 4, 8, 12, and 16) were synthesized. The mesophases and phase structures of all the com…
In situ Fourier transform infrared (FTIR) spectroscopy was employed to characterize the adsorption behavior (as a function of pressure or time) and surface species of CO2 molecules on pure, phosphated, and phosphonated CaO. Carbonate and bicarbonate species were found to form on the pure oxide, whereas on the phosphat…
Abstract The synthesis and crystal structure of a Dawson‐type dirhenium(V)‐oxido‐bridged polyoxotungstate are described. The potassium salt K 14 [O{Re V (OH)(α 2 ‐P 2 W 17 O 61 )} 2 ] · 21H 2 O (K‐ 1 ) was obtained as analytically pure, homogeneous, black‐purple crystals by the reaction of a monolacunary Dawson polyox…
Abstract The reaction of succinyl succinates with aniline, iodoaniline and iodobiphenylamine yielded 2,5‐bis(arylamino)terephthalates. Suzuki cross‐coupling reactions of the iodo‐functionalized compounds with phenyl‐ and biphenylylboronic acids gave 2,5‐diaminoterephthalates with N ‐biphenylyl, N ‐terphenylyl and N ‐q…
A solution-based etching process often takes place in remodeling natural minerals and building natural wonders such as stalactites and stalagmites. Enlightened by this spontaneous mineralization process, we proposed a surfactant-assisted etching in biomimetic mineralization aiming at a better imitation of natural envi…
We report the facile wet-method to synthesize the cobalt hollow microspheres without surfactants, and then a series of Co@CoO composite hollow structures including Co@CoO concentric double-shell hollow spheres (CDSHS), Co@CoO hollow sphere in hollow sphere (HSIHS), and CoO hollow spheres are fabricated by simply oxida…
The distributions of interatomic distances of the first four coordination shells of copper and their leading cumulants have been determined by a path-integral Monte Carlo calculation on a many-body potential model, in the temperature range of 4--300 K. The asymmetry of the distance distribution, measured by the third…
NMR chemical shifts of N–R-functionalized ( n, 0) single-walled carbon nanotubes (SWNTs) with n = 11, 13−17 were computed from first principles. The chemical shifts of functionalized carbons at a bond diagonal to the SWNT axis are strongly dependent upon the C−C distance in the C−NR−C moiety. This distance, in turn, i…
The formation of OH radicals and its diffusion into the gas phase during the excitation of TiO 2 in the presence of H 2 O has been studied using the very sensitive and selective detection method of laser-induced fluorescence (LIF). The time-resolved evolution of the OH radical concentration has been observed at pressu…
Al 2 O 3 -coated cordierite has been widely used as a catalyst’s support. In this work, three Al 2 O 3 precursors or alumina sols are studied to understand the effect of type, viscosity, and grain size of the sols and Cl − on properties and SCR activities of honeycomb CuO/Al 2 O 3 /cordierite catalysts. X-ray diffract…