Materials Literature
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In this study, 30 at% Er:RETaO<sub>4</sub> (RE = Sc, Y, Gd, Lu) polycrystalline powders were synthesized by the solid-state method. Their structures were determined by the Retvield refinement to X-ray powder diffraction. The optical spectra of the trivalent erbium ions in monoclinic RETaO<sub>4</sub> (RE = Sc, Y, Gd,…
Abstract Ladderlike polysilsesquioxanes (LPSs) containing chloromethylphenyl groups were synthesized from ( p ‐chloromethyl)phenyltrimethoxysilane under basic conditions. Functionalized multiwalled carbon nanotubes (MWNT–COOH) were prepared by the acid treatment of pristine multiwalled carbon nanotubes (MWNTs). MWNT–C…
A new experimental protocol for the evaluation of the flow activation volume is proposed. It is based on step-shear experiments carried out on polymer melts. The flow activation volume evaluated agrees with the volume of a tube confining the chain, and is the same for the polymer melt and its composites with as receiv…
We reported the enhanced light extraction efficiency in InGaN/GaN multiple quantum well green light-emitting diodes (LEDs) with gallium oxide hydroxide (GaOOH) rods. The GaOOH rods were prepared by an aqueous gallium nitrate solution at 80°C and then coated on the surface of indium tin oxide electrodes of LEDs by a si…
Extraordinary Optical Transmission of TM waves impinging at oblique incidence on metallic or high permittivity dielectric screens with a periodic distribution of 1D slits or any other kind of 1D defects is analyzed. Generalized waveguide theory altogether with the surface impedance concept are used for modeling such p…
The electromechanical behavior of single-walled carbon nanotubes (SWNTs) in contact with different materials is investigated by scanning probe microscopy. An anomalous diamond/semiconducting nanotube behavior is observed, which is consistent with ab initio calculations: the formation of a broken-gap heterojunction bet…
This study is the first to show dry sliding wear properties of sub-microcrystalline ultra-low carbon steel produced by high-pressure torsion (HPT) straining. Effects of number of turns in HPT process and counter materials in wear tests were investigated using a ball-on-disc friction method. Wear tests were carried out…
Organic–inorganic hybrid nanoparticles of poly(styrene) (PSt) and fumed silica have been successfully synthesized via atom transfer radical polymerization (ATRP) and investigated as fillers for styrene–butadiene rubber (SBR). On the one hand, they were prepared by using the grafting from methodology, in which an ATRP…
In ceramic BaTiO 3 thin film prepared by chemical solution deposition, the influence of small grain size (10–150 nm) and grain boundaries on ferroelectric behavior is investigated by the studies of low‐frequency dielectric response. The apparent permittivity is suggested to result from an ensemble of grains possessing…
Abstract A novel method to produce uniaxially aligned nanofibers is described, in which a pair of parallel auxiliary electrodes at a positive potential is placed between the needle and the collector electrodes. Charged nanofibers ejecting from the polymer solution are pre‐aligned by the electrostatic repulsion origina…
Typical lenses suffer from Fresnel reflections at their surfaces, reducing the transmitted power and leading to interference phenomena. While antireflection coatings can efficiently suppress these reflections for a small frequency window, broadband antireflection coatings remain challenging. In this paper, we report o…
Vertically aligned single-crystal SnO(2) nanoshuttle arrays with uniform morphology and a relatively high aspect ratio were synthesized by a simple hot-wall chemical vapor deposition (CVD) method. It was found that regulating the growth temperature gradient could change the shape of the SnO(2) nanostructure from nanos…
Multistrand 7-1 helical Au(24), Au(32), and Au(40) structures with three, four, and five gold atoms in the central strand and 21, 28, and 35 gold atoms in the coaxial tube are investigated using relativistic density functional theory. We demonstrate that these helical gold nanorods are stable structures with a rather…
Nucleosides are chemical compounds that have an extremely important biological role; they can be found in all types of living organisms. They are crucial components from which DNA and RNA acids are built. In addition, nucleosides are key regulators of many physiological processes. In this paper, the molecular dynamics…
Compound drops comprise two or more immiscible phases, one of which entirely or partially engulfs the others. In this work we consider the thermocapillary-induced motion of partially engulfed compound drops, composed of two phases, in an immiscible fluid. If the capillary number is negligibly small, Ca << 1, the parti…
Grain boundaries (GBs) significantly affect the properties of materials. In an effort to examine the phenomena at GBs, many model boundaries, typically symmetric tilt GBs, have been investigated. However, the geometries of symmetric tilt GBs are too restricted to represent commonly occurring interface phenomena proper…
We describe a simple microrheology method to measure the viscosity coefficients of lyotropic liquid crystals. This approach is based on the use of a rotating laser-trapped optically anisotropic microsphere. In aligned liquid crystals that have negligible effect on trapping beam's polarization, the optical torque is tr…
Abstract Lysozyme, an enzyme with bactericidal activity over Gram‐positive bacteria cells, is incorporated into PEDOT to prepare films with high biological and electrochemical activity. Two different strategies are used: (1) PEDOT films are coated with a layer of enzyme, which was adsorbed on the surface; and (2) the…
It is well recognized that power consumption and heat removal in state-of-the-art integrated circuits (ICs) with the nanometer size of transistors is an urgent challenge. The electronic industry's transition to multicore designs, where the performance increase is achieved not via the increase in the clock frequency bu…
NiAl 2 O 4 , NiFe 2 O 4 , and their solid solution Ni(Fe z Al 1− z ) 2 O 4 have been studied using high temperature oxide melt solution calorimetry in molten 2PbO·B 2 O 3 at 973 K. X ‐ray absorption near edge structure ( XANES ) measurements and M össbauer spectroscopy investigation of the cation distribution showed t…