Materials Literature
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The synthesis and materials properties of a new liquid crystalline phthalocyanine, octakis (2-benzyloxyethylsulfanyl) copper (II) phthalocyanine, 2, are reported. This phthalocyanine possesses eight benzyl-terminated side chains with thioether links to the Pc core, which promote greater interaction between the discoti…
The force generated by a polypyrrole (PPy) actuator operating under isometric conditions has been shown to decrease as the preload force applied to the actuator increases. The origin of the decrease in the force generated was found to be the change in modulus that occurs upon electrochemical stimulation of the polypyr…
Abstract Thermoelectric properties of camphorsulfonic acid (CSA) doped conducting polyaniline with different structures have been studied. The sample with special submicron-fibre structure exhibited 20 times higher thermoelectric power factor at 300 K than the sample with general grain structure, which could be ascrib…
Three types of heteropolyvanadates, [(C2H5)4N]4[PdV6O18] (1), [(C2H5)4N]4[Cu2V8O24] (2), and [(C6H5)4P]4[Ni4V10O30(OH)2(H2O)6] (3), were synthesized through the reaction between the [VO3]- anion and metal template cations of Pd(II), Cu(II), and Ni(II). The X-ray crystal structures of 1 (a = 29.952(4) A, b = 12.911(2)…
High surface area phosphosilicate glasses were synthesized by a new sol−gel method and characterized for structural, textural, and acid properties by X-ray diffraction, thermogravimetry/differential thermal analysis, IR spectroscopy (Fourier transform and diffuse reflectance Fourier transform), solid state 31 P and 29…
Three series of palladium(II) complexes 1 − 3 derived from 1,3,4-oxadiazoles exhibiting mesogenic properties are prepared and characterized. It was found that the formation of mesophases was sensitive to the numbers of alkoxy side chains. The compounds 3 appended with twelve side chains exhibited columnar (Col) phases…
We report on the formation of ordered arrays of micrometric holes on the surface of polystyrene (PS) films cast from volatile solvents in the presence of humidity at different temperatures. The formation mechanism is investigated for PS having different molecular weights, polydispersities, and carboxylic terminations.…
The mechanism of the discontinuous swelling/deswelling transitions exhibited by polyelectrolyte multilayers containing poly(allylamine hydrochloride) (PAH) was examined by FT-IR spectroscopy, in-situ atomic force microscopy (AFM), and in-situ ellipsometry. Assembly pH was found to play a critical role in determining t…
We have investigated the annealing effect on the structural, optical and electrical properties of copper oxide films prepared on glass substrates by chemical deposition. The films were annealed in air for different temperatures ranging from 200 to 350 °C. X-ray diffraction patterns showed that the films as-deposited a…
The ring-opening polymerization of l -lactide initiated by rare earth metal silylamido complexes [Ln(OSSO){N(SiHMe 2 ) 2 }(THF)] ( 1 − 3: Ln = Y, Lu; OSSO = 1, ω-dithiaalkanediyl-bridged bisphenolato) was studied. MALDI-TOF mass spectrometry and 1 H NMR spectroscopy suggested that the polymerization proceeded via a co…
Light emission from silicon based on quantum confinement in nanoscale structures has sparked intense research into this field ever since its discovery about 15 years ago. A barrier to the widespread utilization of luminescent silicon nanocrystals in such diverse application areas as optoelectronics, solid-state lighti…
A theoretical study based on a first-principles band-structure calculation is carried out for the hypothetical wurtzite (WZ) MBi (M=V, Cr, Mn). The lattice parameters a and c are determined to be 0.4524nm∕0.7384nm, 0.4496nm∕0.7352nm, and 0.4508nm∕0.7367nm for WZ VBi, CrBi, and MnBi, respectively. The total energy diff…
We show that double exchange does not always favour the ferromagnetic spin state. In transition metal oxides with strongly hybridized dp bands, the energy of conduction electrons can be minimized by an incommensurate helicoidal ordering of local spins. This explains the magnetic order observed in the iron perovskites…
Semi-solid multiple W/O/W emulsions with low concentrations (0.8, 1.6 and 2.4% w/w) of lipophilic polymeric primary emulsifier PEG-30-dipolyhydroxystearate (PDHS) have been formulated. Both emulsions, primary and multiple, were prepared with high content of inner phase (Phi1 = Phi2 = 0.8). All the formulations differ…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis of Water-Soluble Electroactive Ferrocene-Grafted Poly(p-phenylene-ethynylene) via Phase Transfer and Its Biosensing ApplicationCuihua Xue, Zhen Chen, Fen-Tair Luo, Kumaranand Palaniappan, David J. Chesney, Jian Liu, Jian Chen, and Haiying LiuView Author Information De…
Under appropriate growth conditions, transition-metal-doped TiO 2 (V/Cr/Fe/Co/Ni : TiO 2 ) thin films deposited on various types of substrates by laser ablation could be ferromagnetic above room temperature. As for LaAlO 3 substrates, which seem to be the best, when the growth temperature was 650°C, Fe/Co/Ni-doped TiO…
In exchange-coupled two-phase permanent magnets, the length scale of soft phase is limited to about twice of the domain-wall width of the hard phase. To optimize the energy product, it is important to realize this length experimentally. In this work, we investigate the Sm–Co∕Co hard/soft multilayers with varying thick…
Boron–silicon clusters are produced in various semiconductor-related processes. The exact structure and properties of these clusters are of great practical interest. No previous theoretical studies of these neutral clusters were found, and few experimental studies. The molecules B2Si, BSi2 and B2Si2 tend to form rings…
We consider the antiferromagnetic spin-$1∕2$ Heisenberg model on a two-dimensional bipartite quasiperiodic tiling. The broken symmetry ground state in this model is inhomogeneous, reflecting the fact that there are a variety of local environments in such a structure. An important symmetry of the quasicrystal, namely t…
Optical absorption and IR reflection measurements of MnO were performed under various pressures up to 140 GPa at room temperature. In IR reflection measurement, a drastic increase in reflectivity due to the metallization is observed from 94 GPa. On the other hand, in absorption, it is observed that the band gap does n…