Materials Literature
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The ZnO-LiYbO(2) hybrid phosphors were sintered by the solid-state reaction method, in which the intense near-infrared emission around 1000 nm due to Yb(3+ 2)F(5/2)-->(2)F(7/2) transition was obtained due to the efficient energy transfer from ZnO to Yb(3+) ions. The growth of the LiYbO(2) crystal and the formation of…
Abstract Organically modified and unmodified montmorillonite clays (Cloisite NA, Cloisite 30B and Cloisite 15A), sepiolite (Pangel B20) and nanosilica (Aerosil 300) were incorporated into hydrogenated nitrile rubber (HNBR) matrix by solution process in order to study the effect of these nanofillers on thermal, mechani…
The interest in the application of cholesteric liquid crystals for tunable lasers has risen in the past few years. Here, we want to obtain a mechanically tunable laser device using cholesteric liquid crystal (CLC) elastomers as resonant cavity mirrors in a three-layer configuration, which includes in between an isotro…
Abstract The microstructural evolution, microhardness, tensile properties and impact toughness of Ti‐5Al‐2Sn‐2Zr‐4Mo‐4Cr (Ti17) alloy joints welded by linear friction welding (LFW) are investigated. A narrow, sound weld is formed, consisting of a superfine α + β structure in the weld center. The structure gradually ch…
We measured the Seebeck coefficient of heavily P-doped silicon-on-insulator layers with P concentrations above 1×1019 cm−3. The coefficient decreased with increasing P concentration, and with a peak of the Seebeck coefficient around 5×1019 cm−3. We calculated the density-of-states (DOS) of bulk Si based on theoretical…
Abstract Four novel dioxidomolybdenum(VI) complexes [MoO 2 (L x )(CH 3 OH)] have been synthesized, using 2[( E )‐(2‐hydroxy‐2‐phenylethylimino)methyl]phenol derivatives as tridentate ONO donor Schiff base ligands (H 2 L x ) and MoO 2 (acac) 2 . A monoclinic space group was determined by X‐ray crystallography from sing…
We report the observation of a biaxial nematic phase in a bent-core molecular system using polarizing microscopy, electro-optics, and dielectric spectroscopy, where we find that the biaxiality exists on a microscopic scale. An application of electric field induces a macroscopic biaxiality and in consequence gives rise…
High-pressure extended x-ray absorption fine-structure measurements were performed on amorphous ${\text{GeO}}_{2}$ over increasing and decreasing pressure cycles at pressures up to 44 GPa. Several structural models based on crystalline phases with fourfold, fivefold, and sixfold coordination were used to fit the Ge-O…
Monodispersed metastable cubic AgInS2 nanocrystals with an average size of around 2.5 nm are obtained via a solution-phase reaction. In contrast with the usual chalcopyrite and orthorhombic phase, Ag+ and In3+ cations in metastable cubic AgInS2 are randomly coordinated by four S2− anions. A phase transition from catio…
We study short-time diffusion properties of colloidal suspensions of neutral permeable particles. An individual particle is modeled as a solvent-permeable sphere of interaction radius a and uniform permeability k, with the fluid flow inside the particle described by the Debye-Bueche-Brinkman equation, and outside by t…
Magnetization and magnetostriction measurements in constant tension and compression as a function of applied magnetic field are reported for ⟨100⟩ oriented, textured polycrystalline Fe81.6Ga18.4 and Fe79.1Ga20.9 Galfenol alloys. The susceptibility change with stress, or sensitivity, is maximum at zero field for both a…
Pb(In(12)Nb(12))O(3)-Pb(Mg(13)Nb(23))O(3)-PbTiO(3) (PIN-PMN-PT) single crystals have been developed recently, which can increase the operating temperature by at least 20 degrees C compared to PMN-PT crystals. We have measured a complete set of material properties of single domain PIN-PMN-PT crystal, which is urgently…
Covalent grafting of biomolecules is a strategy to improve the biocompatibility and bioactivity of materials. However, it is critical to maintain the biological activity of the biomolecule upon its attachment to the surface. In the present study we compared the biological properties of chitosan, in which the surface w…
In our numerical study based on a phenomenological description of strongly confined liquid crystalline blue phase I (BP I), we find several novel structures characterized by specific configurations of topological disclination lines. The thickness of the system is of the order of the dimension of the unit cell of the b…
Systematic variations in the structural and electronic properties of BiFeO3 with A-site substitutions were studied using first-principles density functional theory calculations. It is found that the ferroelectric distortion of BiFeO3 with group IIIA element (Sc3+, Y3+, and La3+) substitutions is significantly affected…
Point defects and volatile impurities (helium, xenon, oxygen) in uranium monocarbide UC are studied by first-principles calculations. Preliminarily, bulk properties of UC and of two other uranium carbide phases, ${\text{UC}}_{2}$ and ${\text{U}}_{2}{\text{C}}_{3}$, are calculated in order to compare them to experiment…
Hydrogen storage capacity by hydrogen spillover on metal-doped carbons can be significantly enhanced by introducing surface oxygen functional groups to the carbon. It is shown that the enhancement is greater by oxygen plasma treatment compared to air oxidation because different surface groups were formed. Oxygen plasm…
Copper-mesoporous molecular sieves type MCM-41 have been successfully prepared by different direct incorporation methods of the metal in the initial synthesis gel. Various techniques including XRD, AAS, adsorption/desorption of N 2, UV−vis−DR, TPR, and XPS were employed for the materials characterization. All of the m…
Room temperature ferromagnetic ordering is observed in chemically grown ZnO nanocrystals. Nanocrystals are simultaneously capped by two different organic molecules inducing p -type and n -type defects. A saturation magnetization of 0.008 emu/g is achieved at 300 K. Incorporation of Mn 2+ ions at substitutional sites i…
We propose and experimentally demonstrate a functional electron device, which is a polarity-controllable inverter constructed using a four-terminal ambipolar graphene field effect transistor (FET). The FET has two input terminals, both a top gate and a back gate, and the polarity of the FET can be switched by switchin…