Materials Literature
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The valley valve effect was predicted in a straight zigzag graphene nanoribbon (ZGR) p/n junction. In this work, we address a possible valley selection rule in a Y-shaped ZGR junction. By modeling the system as a three-terminal device and calculating the conductance spectrum, we found that the valley valve effect coul…
Abstract We succeeded in synthesizing a novel cuprate compound, [Cu2(CO3)2(bpp)2.5]·5.5H2O (1) (bpp: 1,3-bis(4-pyridyl)propane). Its structural determination reveals that 1 has a ladder-like configuration formed by the alternate stacking of two Cu2+ ions and a CO32− ion, each of which is linked by a bpp molecule. The…
Diglycidyl ether of bisphenol A (DGEBA) is widely exploited as an epoxy resin in adhesives and coatings. In this paper, it is used as an oligomer matrix for silica-filled nanocomposites. Rheological measurements show that the pure matrix obeys power-law relaxation dynamics in the vicinity of the dynamic glass transiti…
The oxidized single-walled carbon nanotubes (SWCNTs) and valine-functionalized SWCNTs were prepared and characterized by using X-ray diffraction (XRD), ultraviolet-visible (UV-Vis), Fourier transform infrared (FT-IR), electron paramagnetic resonance (EPR), scanning electron microscopy (SEM), and energy dispersive X-ra…
Nanosized precipitates have been observed in a Nb-lean gum metal-related alloy, Ti–20.0Nb–0.6Ta–1.7Zr–1.1O at.% (Ti–31.9Nb–2.0Ta–2.7Zr–0.3O wt.%) using probe-corrected high-resolution scanning transmission electron microscopy with a high-angle annular dark-field detector (HAADF). This characterization yields three dis…
The preparation of chiral metal complexes in NaY zeolite is reported. The guests, chiral metal complexes, were entrapped in the supercages of NaY zeolite (host) by a two-step process in the liquid phase: (i) inclusion of the selected transition metal (rhodium(III) and manganese(II)) by ion-exchange in the porous struc…
A hierarchical pore structured novolac-type phenol based-activated carbon with micropores and mesopores was fabricated. Physical activation using a sacrificial silicon dioxide (<TEX>$SiO_2$</TEX>) template and chemical activation using potassium hydroxide (KOH) were employed to prepare these materials. The morphology…
The paramagnetic center in triplet state occurring in electron-irradiated, synthetic ?-quartz has been investigated by using electron paramagnetic resonance (EPR) spectroscopy. The primary spin Hamiltonian parameter matrices g, D and A (hyperfine interactions for five 29Si nuclei) have now been determined. The princip…
Acrylonitrile‐styrene‐butyl acrylate (ASA) graft copolymers with different acrylonitrile (AN) contents, the core‐shell ratio, and tert‐dodecyl mercaptan (TDDM) amounts were synthesized by seed emulsion polymerization. Polyvinylchloride (PVC)/ASA blends were prepared by melt blending ASA graft copolymers with PVC resin…
The plasmon characteristics of two graphene nanostructures are studied using time-dependent density functional theory (TDDFT). The absorption spectrum has two main bands, which result from π and σ + π plasmon resonances. At low energies, the Fourier transform of the induced charge density maps exhibits anomalous behav…
This article deals with the theoretical prediction of the wetting hysteresis on nonideal solid surfaces in terms of the surface heterogeneity parameters. The spatially periodical chemical heterogeneity is considered. We propose precise definitions for both the advancing and the receding contact angles for the Wilhelmy…
We present a flexible model for a generic straight transport barrier in graphene in the specular limit. The specular limit applies for scattering of carriers sufficiently close to the Fermi level in three quarters of the transport barriers. Using the Lippmann-Schwinger equation, we obtain the wave function, from which…
Abstract The variation of bonding ratio in the press bonding of TC4 alloy at temperatures from 850 to 900 °C, pressures from 10 to 30 MPa, and time from 5 to 15 min was investigated. The bonding ratio increases with the increase of temperature, time and pressure. The maximum bonding ratio, i.e. 98 %, can be obtained a…
Metamaterials have been developed as a new class of artificial effective media realizing many exotic phenomena and unique properties not normally found in nature. Metamaterials enable functionality through structure design, facilitating applications by addressing the severe material issues in the terahertz frequency r…
Temperature-programmed desorption measurements have been applied to investigate the binding energies of four systems, namely the photochromic molecular compounds azobenzene and tetra-tert-butyl-azobenzene (TBA) adsorbed on the Au(1 1 1) and Ag(1 1 1) surfaces, respectively. The binding energy is a measure of the inter…
The Fe—Cu—Nb—Si—B alloy nanocomposite containing two ferromagnetic phases (amorphous phase and nanophase phase) is obtained by properly annealing the as-prepared alloys. High resolution transmission electron microscopy (HR-TEM) images show the coexistence of these two phases. It is found that Fe—Si nanograins are surr…
Amorphous agglomerates of carbon nanospheres (CNS) with a diameter range of 10-50 nm were synthesized using the solution combustion method. High-resolution transmission electron microscopy (HRTEM) revealed a densely packed high surface area of <TEX>$SP^2$</TEX>-hybridized carbon; however, there were no crystalline str…
ABSTRACT Poly(styrene‐ co ‐maleic anhydride) (SMA) ionomers were synthesized and designed as a new kind of nucleation agent according to the crystallization theory for improving the crystallization of poly(ethylene terephthalate) (PET). The crystallization behavior of PET with the addition of nucleation agents was inv…
The authors show that the National Institute of Standards and Technology database for the simulation of electron spectra for surface analysis (SESSA) can be used to determine detection limits for thin-film materials such as a thin film on a substrate or buried at varying depths in another material for common x-ray pho…
Thin oxidized copper films in various thickness values are deposited onto quartz glass substrates by electron beam evaporation. The ellipsometry parameters and transmittance in a wavelength range of 300 nm-1000 nm are collected by a spectroscopic ellipsometer and a spectrophotometer respectively. The effective thickne…