Materials Literature
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Mesoporous and dense sol−gel titania films have been synthesized and processed in similar conditions to make a comparative study of crystallization to anatase in porous and dense samples. We have performed a correlative analysis combining THz spectroscopy with synchrotron radiation, variable angle incidence infrared s…
Abstract A novel photodegradable poly(vinyl chloride)‐polyoxometalate/TiO 2 (PVC‐POM/TiO 2 ) nanocomposite film was prepared by embedding nano‐TiO 2 photocatalyst modified by POM into the commercial PVC plastic. The solid‐phase photocatalytic degradation behavior of as‐prepared film under UV light irradiation was inve…
Abstract Bi 12 M x O 20± δ (hereafter BMO; M=Ti, Si, Ge) materials, which have been used as ferroelectric materials, actuators, capacitors, and dielectric and photorefractive materials, have attracted attention as photocatalysts and exhibit high photocatalytic activities in many reactions. However, seldom has work bee…
Flower-like hierarchical Ni3(NO3)2(OH)4 and Zn5(OH)8(NO3)2(H2O)2 compounds were synthesized by a simple solvothermal method. Absolute ethanol was adopted as solvent, and the precursor is the corresponding nitrate. The as-prepared products were studied by XRD, SEM, TEM, and SAED. It is noted that compared to the conven…
The currently available results of the isotope effect on the superconducting transition temperature ${T}_{c}$ in Fe-based high-temperature superconductors (HTSs) are highly controversial. The values of the Fe isotope effect exponent ${\ensuremath{\alpha}}_{\text{Fe}}$ for various families of Fe-based HTS were found to…
An acyclic amino-receptor based bi-fluorophoric signaling system 3 exhibits water-induced simultaneous dual channel chromogenic and fluorogenic signal modulation. Its micromolar solution in various organic solvents exhibits an enhancement in absorption in the presence of water in trace amounts through the water-induce…
A series of d(10) dicyanometallate polymeric compounds were studied by electronic spectroscopy and density functional theory (DFT) calculations. In these materials, the negatively charged one-dimensional (1D) polymeric chains are linked together by [M(en)(2)](2+) (M = Cu(II) and Zn(II); en = ethylenediamine). More tha…
Time-resolved space-charge profiles obtained in low-density polyethylene under sinusoidal or square ac stress for frequencies going from dc to 10 Hz, temperature from 25 to 50 °C and fields of 30 or 40 kV mm −1 are presented. It is shown that most of the features observed under dc stress (generation of carriers of the…
Abstract The development of electrically activated chromogenic materials is important for their potential applications in smart windows. Several previous works have reported on reverse mode operation polymer dispersed liquid crystals (PDLCs) based on negative dielectric anisotropy liquid crystals. They have a transpar…
O conhecimento da estabilidade térmica da madeira e materiais celulósicos é um importante fator na utilização destes materiais de fontes naturais como carga de reforço em matrizes poliméricas. Entretanto, estes materiais possuem baixa resistência à degradação térmica causado principalmente pela presença de espécies vo…
A tetragonal BC 2 (t-BC 2 ) phase originating from the cubic diamond structure was predicted by first-principles calculations. The t-BC 2 structure has a tetragonal lattice (space group I 4 1 / amd, No. 141) and possesses the simple stacking sequence BC 2 BC 2 ... along its c axis. The structural stability of the prop…
We report the application of resonant inelastic x-ray scattering to explore the nature of the single conducting interface in the oxide heterostructure ${\text{LaAlO}}_{3}/{\text{SrTiO}}_{3}$. From the $\text{Ti}\text{ }3d$ crystal-field excitations measured at the $\text{Ti}\text{ }{L}_{3}$ resonance we not only deriv…
Synthesis of segmented all-Pt nanowires is achieved by a template-assisted method. The combination of a suitably chosen electrolyte/template system with pulse-reverse electrodeposition allows the formation of well-defined segments linked to nanowires. Manipulation of the morphology is obtained by controlling the elect…
Three anionic polyoxometalates contain catalytically active vanadium(IV) centers and peripheral metal sites of Mn(2+), Co(2+) or Ni(2+) cations, which synergistically affect the catalytic selectivities of unprecedented oxidative cyclization of acetylacetone to form two interesting multifunctional furan derivatives.
We report here a facile synthetic and analytical approach that allows us to identify and characterize functionalized polyoxomolybdate clusters that form upon the partial reduction of Mo(VI) salts in the presence of organoarsonate ligands. We demonstrated that electrospray ionization mass spectrometry, in combination w…
Understanding the bonding of sulfur at the germanium surface is important to developing good passivation routes for germanium-based electronic devices. The adsorption behavior of ethyl disulfide (EDS) and 1,8-naphthalene disulfide (NDS) at the Ge(100)-2 × 1 surface has been studied under ultrahigh vacuum conditions to…
Precipitation of calcium carbonate in different carrageenan gelling environments was initiated by fast mixing of calcium chloride and sodium carbonate solutions. Carrageenan concentration and the gelling mechanism, controlled by the addition of different cross-linking cations, calcium or sodium, were varied in order t…
Low resistivity and high transmittance of Al-doped ZnO (AZO) and Ga-doped ZnO (GZO) transparent conductive thin films have been achieved by use of pulsed dc magnetron sputtering in a hydrogen environment at room temperature. The addition of hydrogen to the sputtering gas can reduce the resistivity of the films and imp…
The bis(pyridyl)-substituted TTF derivative, 2,6(7)-bis(4-pyridyl)-1,4,5,8-tetrathiafulvalene (TTF(py)(2)), and an inorganic analogue, [Ni(4-pedt)(2)] (4-pedt = 1-(pyridin-4-yl)ethylene-1,2-dithiolate), were used as bridging ligands to construct two multinuclear complexes {Co(II)(2)(Tp(Ph2))(2)(OAc)(2)[TTF(py)(2)]} (1…
We report that a graphene sheet has an unusual mode of atomic-scale fracture owing to its structural peculiarity, i.e. single sheet of atoms. Unlike conventional bond-breaking tensile fracture, a graphene sheet can be cut by in-plane compression, which is able to eject a row of atoms out-of-plane. Our scale-bridging m…