Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The ac conductivity of a new class of disordered solids, i.e. mechanochemically synthesized amorphous fast ion conducting Ag2S–Sb2S3 materials, has been investigated in the audio frequency range (10–107 Hz) down to cryogenic temperatures (∼10 K). The conductivity spectra exhibit the usual signature of a disordered sys…
In this paper we report the observation of enhanced field emission properties from thiolated multi-wall carbon nanotubes (MWCNTs) produced by a simple and effective two-step chemical surface modification technique. This technique implements carboxylation and thiolation on the MWCNTs synthesized by microwave plasma che…
Abstract Electrically conducting elastomer fibers based on natural rubber (NR) and up to 10% w/w polyaniline (PANI) in its emeraldine base (EB) form were fabricated by a wet spinning process. The resulting fibers at various PANI contents were doped by immersion in aqueous HCl solution, which converted the PANI to the…
Abstract An experimental technique, crystallization analysis fractionation (Crystaf), is used to analyze compositional uniformity of ethylene/α‐olefin copolymers and isotactic polypropylene. A computerized method for quantifying Crystaf data is developed based on resolution of Crystaf curves into their elemental compo…
In this paper, we suggest a facile and effective method for water-repellent coating of oxide surfaces. As a coating material, we synthesized a new random copolymer, referred to as poly(TMSMA-r-fluoroMA), by the radical polymerization of 3-(trimethoxysilyl)propyl methacrylate (TMSMA) and a fluoromonomer(®) bearing meth…
The vibrational spectroscopy of (SO4(2-)).(H2O)n is studied by theoretical calculations for n=1-5, and the results are compared with experiments for n=3-5. The calculations use both ab initio MP2 and DFT/B3LYP potential energy surfaces. Both harmonic and anharmonic calculations are reported, the latter with the CC-VSC…
Bridging the materials and pressure gaps: The adsorption of CO on ZnO surfaces becomes much stronger in the presence of preadsorbed CO2 (see picture; O red, Zn gray, C green). The increased strength of the interaction between CO and polycrystalline ZnO powder originates from the formation of tridentate carbonate speci…
To the bursting point: The molecule shown forms a complex liquid-crystalline phase in which core–shell columns are embedded in a polygonal honeycomb formed by supramolecular cylinders (see picture; RF=perfluorinated end groups). Temperature-induced anisotropic swelling of the cylinders occurs, and a transition to a la…
A good connection: A polyphilic oligothiophene derivative (see formula) forms a complex liquid-crystalline phase, in which the π-conjugated rods are organized in a honeycomb-like network of square cylinders (see picture). This arrangement opens new possibilities for the directed organization of π-conjugated organic ma…
Additives play an important role in improving the properties of ferroelectric barium titanate. Barium titanate ceramics doped with alkali were prepared. These additives replaced other cations and changed the structure of the crystal. The interaction between different ions in the material affected the related vibration…
Stoichiometric tungsten oxide (WO(3)) nanorods are synthesized on tungsten (W) substrates by a high-temperature, catalyst-free, physical deposition process and by subsequent annealing in oxygen atmosphere. Tungsten oxide nanorods are grown by thermal evaporation of WO(3) powder at elevated temperature in a tube furnac…
We predict a most likely structure of superhard ${\mathrm{BC}}_{2}\mathrm{N}$, named $z\text{\ensuremath{-}}{\mathrm{BC}}_{2}\mathrm{N}$, which is constructed from the sixteen-atom supercell of diamond by using first-principles calculations. $z\text{\ensuremath{-}}{\mathrm{BC}}_{2}\mathrm{N}$ is a more stable metastab…
Molecular dynamics simulations are carried out on the isothermal crystallization process of single polyethylene chains with different chain lengths on the single wall carbon nanotube. This process is summarized as two steps, i.e., adsorption and orientation, and the bond-orientational order parameter is used to show t…
Two dimensional metal nanoparticle arrays with a size gradient (see figure) are generated by shadow deposition of a finely-collimated low energy cluster beam under an oblique incident configuration. The length of the gradient region is tunable from hundreds of nanometers to several micrometers, by adjusting the incide…
Abstract Semi‐empirical quantum chemical study of the oxidative polymerization of aniline with ammonium peroxydisulfate, in aqueous solutions without added acid, has been based on the MNDO‐PM3 computations of thermodynamic, redox, and acid–base properties of reactive species and the intermediates, combined with the MM…
The collapse and stability of carbon nanotubes (CNTs) have important implications for their synthesis and applications. While nanotube collapse has been observed experimentally, the conditions for the collapse, especially its dependence on tube structures, are not clear. We have studied the energetics of the collapse…
Based on electromagnetic wave scattering theory, we demonstrate that magnetic and electric surface currents are induced at the inner boundary of a cylindrical cloak by incoming waves. These surface currents have no counterparts in the coordinate transform theory. In addition, electromagnetic fields can penetrate into…
Inside and out: Organic–inorganic mesoporous nanospheres (see image) are prepared by a method in which ethylene glycol plays a key role in improving the structural order and controlling the particle size and morphology. The external surface of the mesoporous nanocarriers is modified with receptor-specific ligands befo…
The excitation and emission properties of Pr3+ and Tb3+ ions doped into YNbO4 (hereafter YNB) and CaNb2O6 (hereafter CNB) have been studied as a function of the temperature in the 10–600 K range. The observed quenching of the luminescence from the 3P0 (Pr3+) and 5D3 (Tb3+) states has been related to an electron transf…
Abstract Practical application to three‐dimensional (3‐D) tissue culture has been limited by the structural restriction of two‐dimensional (2‐D) nature of electrospun nanofiber mat. In this study, for constructing 3‐D nanofibrous structure as real 3‐D tissue engineering scaffold, we developed new fabrication process w…