Materials Literature
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A printed planar Z-shaped meta-atom has recently been proposed as an alternative design to the conventional electric-LC resonator for achieving negative permittivity. Transforming the LC topology of the resonator helps to facilitate transposition of geometrical parameters for the optical regime and also to improve the…
We study the structure and properties of perfect and defect zigzag silicene nanoribbons (SiNRs) with cobalt (Co) atom adsorbed on different sites of SiNRs using density-functional theory (DFT) calculations. A variety of electronic and magnetic behaviors have been demonstrated, which are found to be strongly dependent…
Polybenz‐3,1‐oxazinone‐4 (PBOZ) films are prepared via the thermal rearrangement of poly[(methylene‐bis‐anthranilamide) 4,4′‐diphenyloxidicarboxylic acid] (PAA) films by heating to 300 °C. PAA is synthesized by low‐temperature polycondensation. The PBOZ film exhibits excellent mechanical properties and a high glass‐tr…
The growth dynamics of 1D nanorods (NRs) composed of noble metals is ambiguous during glancing angle deposition (GLAD). The continuum equation (CE) model describes ballistic deposition limited by adatom diffusion, not verified in GLAD of noble metal NRs. In this work, GLAD is operated at Ts (substrate temperature) bel…
In this study, graphene field effect transistor arrays were fabricated, using solid-phase growth of graphene on a SiO2/Si substrate. Transfer-free fabrication was made possible by the fact that the graphene was grown not on a metal catalyst film, but on an insulating SiO2 substrate. Electrical isolation process was al…
Novel amphiphilic copolymers have been synthesized based on a biocompatible poly(hydroxyethylaspartamide) (PHEA) backbone, bearing both anchoring groups for gold nanoparticles, such as thiols and disulfide, and conjugable moieties, such as amino groups, the latter as points suitable for appending further functional ag…
The rate of potassium (K) release from soils can significantly influence K fertility of soils. The aim of this study was to assess the impact of different land uses on K release from calcareous soils, within agricultural areas of western Iran. The kinetics of K release in 0.01 M CaCl2 was studied in surface samples of…
By means of an envelope function analysis, we perform a numerical investigation of the conductance behavior of a graphene structure consisting of two regions (dots) connected to the entrance and exit leads through constrictions and separated by a potential barrier. We show that the conductance of the double dot depend…
Using molecular mechanics simulations, the elastic properties of multi-layer graphene (MLG) are investigated; this includes both the linear analysis based on the indentation load-displacement relationship and the nonlinear analysis based on the strain energy. The elastic properties of graphene layers in MLG are simila…
Using silicotetraetilortosilicate (TEOS) mixed with aluminum tri-sec-butoxide (TSBAI) or aluminum cloaures mullite ceramics were created by the sol-gel method. The quantities used of each substance were those that led to obtain stoichiometric mullite (3Al2O3·2SiO2). The experimental methodology used for obtaining mull…
Evanescent wave dynamic light scattering and Stokesian dynamics simulations were employed to study the dynamics of hard-sphere colloidal particles near a hard wall in concentrated suspensions. The evanescent wave averaged short-time diffusion coefficients were determined from experimental correlation functions over a…
Metallacarboranes are promising towards realizing room temperature hydrogen storage media because of the presence of both transition metal and carbon atoms. In metallacarborane clusters, the transition metal adsorbs hydrogen molecules and carbon can link these clusters to form metal organic framework, which can serve…
The electric field induced structural transformation in (Na0.52K0.48)(Nb1−ySby)O3 ceramics near the rhombohedral (R)-orthorhombic (O) phase boundary was investigated by means of ex-situ and in-situ synchrotron x-ray diffraction and dielectric measurements. An intermediate monoclinic (M) phase was irreversibly induced…
We report white light generation (WLG) in Tm3+/Ho3+/Yb3+ doped PbO-GeO2 glass under continuous-wave excitation at 980 nm. Intense blue (≈477 nm), green (≈545 nm), and red (≈ 658 nm) emissions were simultaneously observed at room temperature. The blue light is mainly due to the Tm3+ transition 1G4 → 3H6. The green emis…
The phase transition mechanism of AZADO radical has been examined in terms of the molecular rotation. Drastic changes in optical, magnetic and dielectric properties associated with the phase transition can be explained by molecular rotation and an associated order–disorder transition.
We report the results of non‐resonant and resonant Raman scattering in orthorhombic nanocrystalline CuInS2 semiconductor, supported by density functional first principle lattice dynamics calculations. A larger number of dominant phonon modes in comparison with standard tetragonal CuInS2 phases is shown to be associate…
Lead telluride (PbTe) is a well-known functional material with current applications in fields such as nanostructured thermoelectrics. Here, we report comprehensive first-principles simulations for important crystal surfaces of rocksalt-type PbTe. Surface energies have been computed for pristine (001), (011), and (111)…
We report on the voltage response of carbon nanotube devices to sub-terahertz (THz) radiation. The devices contain carbon nanotubes (CNTs), which are over their length partially suspended and partially Van der Waals bonded to a SiO2 substrate, causing a difference in thermal contact. We observe a DC voltage upon expos…
In this study, we describe a rational design strategy to develop a latent ratiometric fluorescent pH probe from self-assembled seminaphthorhodafluor (SNARF) derivatives in aqueous conditions. Analysis of the characteristics of SNARF derivatives with protected phenolic groups allowed classification of the threshold bet…
In this study, the rotational dynamics of hydration water confined in calcium-silicate-hydrate (C-S-H) gel with a water content of 22 wt.% was studied by broadband dielectric spectroscopy in broad temperature (110-300 K) and frequency (10(-1)-10(8) Hz) ranges. The C-S-H gel was used as a 3D confining system for invest…