Materials Literature
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We describe the synthesis of three tetraureacalix[4]arenes having four appended terminal azobenzene groups. In CD2Cl2 solution and at millimolar concentration, the thermally equilibrated all-trans-tetraureas dimerize quantitatively, encapsulating one Me4P(+) cation. The light-induced isomerization of the all-trans enc…
A dual-metasurface-based reflective device ("meta-mirror") has been proposed for broadband polarization manipulation, which is composed of orthogonal metallic cut-wire arrays separated from a grounded plane with different distances. The reflective phases of orthogonally linearly-polarized components can be independent…
Ab initio density functional theory was used to investigate the adsorption of oxygen molecule on the nickel-rich pentlandite (110) surface, which is important for mineral extraction. The three most reactive adsorption sites: Fe-top, Ni-top, and fcc-hollow have been considered. Firstly, the non-adsorbed pentlandite sur…
Enhancement of the fluorescence intensity of quantum dot (QD)-polymer nanocomposite arrays is an important issue in QD studies because of the significant reduction of fluorescence signals of such arrays due to nonradiative processes in densely packed polymer chains in solid films. In this study, we enhance the fluores…
Precursor powders of barium hexaferrite doped with vanadium, BaFe 12- x V x O 19 with ( x = 0.1, 0.2, 0.3, 0.4, 0.5), were prepared using the ball milling technique and then sintered at different temperatures for 2 h. The structural properties of the prepared samples were investigated by X-ray diffraction (XRD) and sc…
The negative magnetization and zero-field cooled exchange bias (ZFC EB) effect are observed in Co0.8Cu0.2Cr2O4 polycrystalline ceramics. 20% Cu substitution for Co in CoCr2O4 leads to the evident magnetization reversal at the compensation temperature (Tcomp ∼ 50 K) with applied magnetic field of 500 Oe. Besides, Tcomp…
2D crystals based on transition metal dichalcogenides (TMDs) provide a unique platform of novel physical properties and functionalities, including photoluminescence, laser, valleytronics, spintronics, piezoelectric devices, field effect transistors (FETs), and superconductivity. Among them, FET devices are extremely u…
A dual-phase structure consisting of the NaZn13-type (1:13) matrix and a secondary (Fe,Co)-Si phase is designed in Fe-rich La-(Fe,Co)-Si compounds. As the extra-Fe doping altered Co content of the 1:13 phase, the magnetic entropy change keeps to be a relatively large magnitude of 6.7–7.7 J/kg K in 265–290 K for 2 T fi…
Ferroelectric domain walls (DWs) do not only affect the properties of a ferroelectric material, but they also exhibit themselves fascinating functionalities. Hence, it is quite evident that the pathway of DWs is of major interest. Whereas, for thin films, mapping the domain pattern at the samples' surface is usually s…
Achieving low resistance contacts to graphene is a common concern for graphene device performance and hybrid graphene/metal interconnects. In this work, we have used the circular Transfer Length Method (cTLM) to electrically characterize Ag, Au, Ni, Ti, and Pd as contact metals to graphene. The consistency of the obta…
We use density functional theory to explain the preferred structure of partially reduced ${\mathrm{CeO}}_{2}(111)$. Low-energy ordered structures are formed when the vacancies are isolated (maximized intervacancy separation) and the size of the ${\mathrm{Ce}}^{3+}$ ions is minimized. Both conditions help minimize disr…
We designed a series of porous graphene as the separation membrane for hydrogen gas in coal gas. The permeation process of different gas molecules (H 2, CO, CH 4, and H 2 S) in porous graphene was evaluated under the atmospheric pressure and high pressure conditions. Our results indicate the hydrogen permeability and…
The magnetic, structural, and vibrational properties of $\mathrm{YM}{\mathrm{n}}_{2}{\mathrm{O}}_{5}$ multiferroic have been studied by means of neutron, x-ray powder diffraction, and Raman spectroscopy at pressures up to 6 and $30\phantom{\rule{0.28em}{0ex}}\mathrm{GPa}$, respectively. Application of high pressure, $…
A special design of a complex-ordered liquid crystal polymer film is developed into a holographic polarizer. The holographic polarizer shows over 90% transmittance, which provides a simple solution to make LEDs polarized. Furthermore, the holographic polarizer exhibits intensity and polarization maintenance properties…
Synthesis of barium hexaferrites BaFe 12 O 19 (BaM) is often accompanied by the presence of secondary nonmagnetic phases. The coexistence of these phases reduces the yield of the desired BaM magnetic phase and screens its intrinsic magnetic properties such as the saturation magnetization, and impacts the magnetic prop…
In this study we measured the degrees to which the Schottky barrier heights (SBHs) are lowered in ZnO nanowire (NW) devices under illumination with UV light. We measured the I-V characteristics of ZnO nanowire devices to confirm that ZnO is an n-type semiconductor and that the on/off ratio is approximately 10(4). From…
We report a general method for the fabrication of three-dimensional (3D) macroporous graphene/conducting polymer modified electrode and nitrogen-doped graphene modified electrode. This method involves three consecutive steps. First, the 3D macroporous graphene (3D MG) electrode was fabricated electrochemically by redu…
The mass scaling of the self-diffusion coefficient D of polymers in the liquid state, D ∼ M(β), is one of the most basic characteristics of these complex fluids. Although traditional theories such as the Rouse and reptation models of unentangled and entangled polymer melts, respectively, predict that β is constant, th…
BACKGROUND: The physicochemical properties of nanoparticles (NPs) influence their biological outcomes. METHODS: We assessed the effects of an amorphous silica coating on the pharmacokinetics and pulmonary effects of CeO2 NPs following intratracheal (IT) instillation, gavage and intravenous injection in rats. Uncoated…
Thermoelectric properties of semiconductors are intimately related to their electronic band structure, which can be engineered via chemical doping. Dopant Ga in the cage-structured skutterudite Co4Sb12 substitutes Sb sites while occupying the void sites. Combining quantitative scanning transmission electron microscopy…