Materials Literature
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This paper is concerned with the bending problem of micro- and nanobeams based on the Eringen nonlocal elasticity theory and Timoshenko beam theory. In the former theory, the small-scale effect is taken into consideration while the effect of transverse shear deformation is accounted for in the latter theory. The gover…
The dispersion functions for the refractive index and the extinction coefficient of single- and multiple-layer graphene oxide samples were measured by imaging spectroscopic ellipsometry in the wavelength range of 350−1000 nm and were compared to previously reported results measured by confocal microscopy. The dispersi…
Au nanoparticles are known to be a good catalyst or an effective promoter for a wide range of catalytic reactions. Bimetallic Au−Pd nanoparticles supported on activated carbon were synthesized following a two-step procedure: immobilization of Au sol onto activated carbon followed by immobilization of Pd(0). The cataly…
There are numerous examples of animals or plants that synthesize extracellular high-performance skeletal biocomposites consisting of a matrix reinforced by nano sized crystalline domains. Cellulose and chitin are classical examples of these reinforcing elements, which occur as whisker-like microfibrils that are biosyn…
The limiting steps of CO oxidation catalyzed by ceria via the Mars−van Krevelen reaction mechanism are identified and investigated by means of density functional theory calculations that account for the on-site Coulomb interaction via a Hubbard term (DFT+U). We address the adsorption of CO on the (111) and (110) surfa…
The variability of bird beak morphology reflects diverse foraging strategies. One such feeding mechanism in shorebirds involves surface tension-induced transport of prey in millimetric droplets: By repeatedly opening and closing its beak in a tweezering motion, the bird moves the drop from the tip of its beak to its m…
The current-voltage characteristics of a silicon nanochain is investigated. The nanochain is viewed as a superlattice structure of quantum dots (QDs), where silicon cores in a chain act as QDs while silicon dioxides covering the cores act as potential barriers. It is found that the whole nanochain structure can displa…
Deformation under the combined action of external stress and cyclic hydrogen charging/discharging is studied in a model material, titanium. Cyclic charging with hydrogen is carried out at 860 °C, which repeatedly triggers the transformation between hydrogen-lean α-Ti and hydrogen-rich β-Ti. Due to bias from the extern…
A facile aqueous sol–gel process is being reported for the first time for the synthesis of alumina–lanthanum phosphate (Al 2 O 3 –LaPO 4 ) nanocomposite. X‐ray diffraction (XRD) analysis confirms the absence of any reactive phase even after heating to 1600°C. Microstructural analysis reveals a mutually controlled grai…
In this work, the morphology, structure, surface chemical composition, and optical properties of very thin (10–70 nm) anodic silicon films grown on a silicon substrate by electrochemical dissolution of bulk crystalline silicon in the transition regime between the porous formation and electropolishing were investigated…
First-principles calculations were carried out to investigate the structural and electronic properties of the metal carbides FeC, CoC, NiC, and PtC in the rocksalt structure. The full-potential linearized augmented-plane wave (FP-LAPW) method was used in the framework of the density-functional theory with the generali…
Electrical characterization of dielectric slurries, as 0–3 composite systems, can provide valuable information on the dielectric properties of suspended particles. A new approach developed in our laboratory is based on impedance spectroscopy measurements of the slurries containing dispersed dielectric powders. Dielect…
The structural and optical properties of stain-etched porous silicon are investigated using optical microscopy, scanning electron microscopy, ex situ atomic force microscopy (AFM), photoluminescence (PL), and Fourier transform infrared (FTIR) spectroscopy. The stained layers were formed in a 50% HF solution with the a…
The fabrication of ordered macroporous silicon is obtained by exploiting the self-assembly properties of polymer nanospheres. Here, we demonstrate the method by using nanospheres of 200 nm and 500 nm. These self-assemble in monolayers of ordered hexagonal close-packed nanospheres. A controlled reactive ion etch of the…
Fabrication of high quality p-type ZnO is the main challenge in recent ZnO research that prevents the practical application of ZnO-based devices in optoelectronics. The mechanism behind is thought to be due to self-compensation of native defects and/or dopant-induced donors. In this report, we investigated the chemica…
Abstract In the past decades, 4‐phenylethynyl phthalic anhydride (4‐PEPA) has been the most important endcapper used for thermoset polyimide. As the isomer of4‐PEPA, 3‐phenylethynyl phthalic anhydride (3‐PEPA) has attracted our interest. In this article, 3‐PEPA was synthesized and a comparative study with 4‐PEPA on cu…
Mesoporous aluminophosphate thin films with 3D cubic (Im3m) pore arrangement were synthesized for the first time. Thin films were templated with block copolymer nonionic templates Pluronic F127 and F108 and deposited on a glass substrate by dip-coating. In situ SAXS investigations show the formation of a highly ordere…
Journal of the Korean Physical Society
The influence of a perpendicular electric field (F) on the optical properties of simple hexagonal and rhombohedral few-layer graphenes is studied through the tight-binding model. The electric-field-modulated absorption spectra depend on the stacking sequence. The low-energy absorption spectra of simple hexagonal few-l…
Magnetoelectric (ME) characteristics in a simple Pb(Zr,Ti)O3/Terfenol-D laminate composite are investigated. Both magnetomechanical and electromechanical resonances (EMRs) can enhance ME coupling and the latter plays a more important role. The phase spectra show a significant phase shift of 0.75π–π around each EMR fre…