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。
We report on a high-speed flexible display based on a deformed helix ferroelectric liquid crystal (DHFLC) in a vertically aligned configuration. The mechanical stability of the flexible DHFLC display was achieved using a periodic array of columnar spacers formed directly on the top side of in-plane electrodes by the p…
The behavior of cubic $\mathrm{Zr}{\mathrm{W}}_{2}{\mathrm{O}}_{8}$ on compression in a DAC to $7.6\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ was examined in situ by a combination of synchrotron x-ray diffraction and x-ray absorption spectroscopy (XAS). These data were compared with x-ray absorption measurements on an a…
Filling-control metal-insulator transitions (MITs) and related electronic phase diagrams have been investigated for hole-doped vanadium oxides ${\mathrm{Pr}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}\mathrm{V}{\mathrm{O}}_{3}$, ${\mathrm{Nd}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{V}{\mathrm{O}}_{3}$, and ${\mathrm{Y}}_…
From inelastic neutron scattering experiments, we demonstrate quantum tunneling of the Néel vector in the antiferromagnetic molecular ferric wheel CsFe8. Analysis of the linewidth of the tunneling transition evidences coherent tunneling.
A nonplanar metallacrown [Ni-N-N]12 was achieved using a pentadente ligand, salicylaldehyde 2-pyridinecarboxylhydrazone (H2L) via a new modular self-assembly approach. The special bridging models of the ligand forced the macrocycle to form in a specific size with the wavelike conformation.
We report magnetotransport measurements on the quasi-two-dimensional charge-transfer salts ${\ensuremath{\beta}}^{\ensuremath{''}}\text{\ensuremath{-}}{(\mathrm{BEDT}\text{\ensuremath{-}}\mathrm{TTF})}_{4}[({\mathrm{H}}_{3}\mathrm{O})M{({\mathrm{C}}_{2}{\mathrm{O}}_{4})}_{3}]Y$, with $Y={\mathrm{C}}_{6}{\mathrm{H}}_{5…
In search of purity: As technologies requiring the use of carbon nanotubes become more refined, the purity of the nanotubes becomes an ever-increasingly important factor. This Highlight not only takes a look at some attempts to improve the purity of single-walled carbon nanotubes (SWNTs) but also puts forward some new…
Flower- or cake-shaped particles with uniform particle size ranging from nanometers to micrometers were prepared from the stereo multiblock copoly(rac-lactide)s (smb-PLAs) by precipitating the polymer from its solution in methylene chloride/ethanol via three different methods: slowly lowering the solution temperature,…
Visible light irradiation of 5-acyloxymethyl- and 5-phenoxymethyl-2-pyrrolidino-1,4-benzoquinones effects photoisomerization to labile oxazolidines, which undergo elimination of carboxylate or phenolate leaving groups in high yields to generate trappable o-quinone methide intermediates. [reaction: see text]
A complete procedure for the preparation of clean surfaces of especially hard ionic crystals by ultrahigh vacuum (UHV) cleavage is given and exemplified by the preparation of the (001) surface of single MgO crystals. All important tools that are needed for the preparation are explained in detail. We present a device t…
MoO3 thin films were fabricated in this work by the laser evaporation method operating in continuous wave mode. The samples were prepared at different substrate temperatures, in vacuum and at different oxygen pressures. Oxidation states of the films were obtained by X-ray photoelectron spectroscopy (XPS) and the cryst…
Discrete transition-metal nanoparticles are spontaneously formed on the sidewalls of single-walled carbon nanotubes (SWNTs), which are noncovalently functionalized with 2,2′;6,2′′-terpyridine (Terpy). Such nanotubes are electron-rich hybrid systems, which overcome the energy barrier that prohibits spontaneous electron…
We report the synthesis of aligned N-doped carbon nanotube bundles via CVD (over the temperature range 700−800 °C) using ammonium-exchanged zeolite-β as the substrate, ferric nitrate as the catalyst, and acetonitrile as the carbon precursor. Ammonium exchange of the zeolite was found to be necessary for the formation…
We report on band gap states in C-doped TiO2 films that were prepared by oxidative annealing of sputtered TiC films at 550°C in flowing O2 gas. Deep-level optical spectroscopy measurements revealed three deep levels located at ∼0.86, ∼1.30, and ∼2.34eV below the conduction band. The first level is probably attributabl…
Bundles of single-walled carbon nanotubes are cut by applying a focused energetic electron beam. During cutting, the displaced atoms from the walls are injected into the tubes and migrate in the axial direction. After cutting, the tube ends close, and interstitial atoms become trapped in the hollow core (see picture).…
A simple, one-step method has been utilized to synthesize functional ternary alkali titanate nanowires of single crystallinity. Nanostructural characterization shows that the nanowires are Na2Ti6O13 with [010] growth direction and KTi8O16.5 with [001] growth direction.
The evolution of the iron catalyst during carbon single-walled nanotube growth is studied using calorimetry, temperature-programmed oxidation and Raman measurements. Carbon-induced solid-liquid, and solid-liquid-solid phase transitions of the nanocatalyst during the synthesis were observed. We found that liquid phase…
The adsorption and separation of linear $({\mathrm{C}}_{1}\text{\ensuremath{-}}n{\mathrm{C}}_{5})$ and branched (${\mathrm{C}}_{5}$ isomers) alkanes on single-walled carbon nanotube bundles at 300 K have been studied using configurational-bias Monte Carlo simulation. For pure linear alkanes, the limiting adsorption pr…
The inhibition of calcite precipitation by natural organic material (NOM) in solutions seeded with calcite was investigated using a pH-stat system. Experiments were carried out using three NOMs with different physical/chemical properties. For each of the materials, inhibition was found to be more effective at lower ca…
Thermoresponsive and injectable semi-interpenetrating polymer networks (sIPNs) containing a biospecific cell-adhesive signal and proteolytically degradable domains were developed as a synthetic equivalent of the extracellular matrix (ECM). The sIPNs synthesized define a modular hydrogel ECM where different properties…