Materials Literature
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We simulate the natural frequencies and the acoustic wave propagation characteristics of graphene nanoribbons (GNRs) of the type (8,0) and (0,8) using an equivalent atomistic-continuum FE model previously developed by some of the authors, where the C-C bonds thickness and average equilibrium lengths during the dynamic…
In this article, the effect of hot forging parameters (deformation temperature, strain, and cooling rate) on the microstructure and mechanical properties of commercial vanadium microalloyed forging steel (30MSV6) was investigated. Final, microstructures and mechanical properties were evaluated by optical microscopy, C…
Abstract A polycarbazole–gold nanocomposite is synthesized based on two polymerization techniques, i.e., emulsion and interfacial using aqueous gold chloride and non‐aqueous carbazole monomer solutions. Use of gold chloride as an oxidant for carbazole not only provides a new chemical synthesis for polycarbazole conduc…
We present the design and measurement of broadband, volumetric negative-permeability and negative-refractive-index (NRI) media. Both of these media are fabricated using standard printed-circuit-board techniques and operate at X-band frequencies. The S-parameters of four-cell slabs of the negative-permeability and NRI…
Abstract Inexpensive, large area patterning of ex‐situ synthesized metallic nanoparticles (NPs) at the nanoscale may enable many technologies including plasmonics, nanowire growth, and catalysis. Here, site‐specific localization of Au NPs onto nanoscale chemical patterns of polymer brushes is investigated. In this app…
Ba 0.8 Sr 0.2 Co 0.8 Fe 0.2 O 3-δ exists as a single cubic phase at 1000 °C in air. Upon slow cooling, it transforms, between 900 and 700 °C, to a mixture of cubic, hexagonal, and rhombohedral phases, as evidenced by X-ray diffraction and transmission electron microscopy. The reversible phase change is accompanied by…
B3LYP DFT study revealed that the planar tetracoordinate carbon (ptC) molecules, C 2 Al 4 E 8 (E = CH 3, NH 2, and OH), could be condensed to one-dimensional molecular chains containing planar or quasi-planar C 2 Al 4 units by eliminating CH 4, NH 3, and H 2 O molecules. Natural bond orbital analyses indicate that the…
Abstract This manuscript studies the formation of nanopatterns onto PET films under different experimental conditions. Homogeneous patterns with randomly distributed bumps or nanofibrils were observed depending on the plasma parameters. The influence of the power, oxygen pressure and electrode charge in the etching ra…
Based on the earlier revealed hidden pseudo Jahn-Teller effect which essentially involves excited electronic states we show that, with extension to solids, polyatomic systems with half-filled degenerate shells, e(2) or t(3), form a novel (practically inexhaustible) class of molecular and solid state materials with cor…
Look both ways: Coordination bonding of verdazyl radicals to diamagnetic metal ions dramatically modifies the crystal packing of the electronic spin bearers. The face-to-face positioning of two radicals leads to a magnetic behavior that is more relevant to a S=0 to S=1 spin-transition phenomenon than to the usual exch…
Isolated, infinitely long multiwall carbon nanotubes (MWCNTs) interacting with electromagnetic waves in the microwave and far-infrared frequency regime are analyzed using a semi-classical approach. An expression for the bulk effective conductivity of MWCNTs is obtained, valid up to THz frequencies. The influence of th…
High temperature thermoelectric (TE) properties for triple-filled skutterudites (Sr(x)Ba(x)Yb₁₋₂x)(y)Co₄Sb₁₂ were investigated for alloy compositions in two sections of the system: (a) for x = 0.25 with a filling fraction y ranging from 0.1 to 0.25 and (b) for 0 < x < 0.5 and y = 0.11 + 0.259x. The representation of t…
We have comprehensively investigated the reactivity of hydroxyls on FeO x (111) monolayer islands with different amounts of oxygen vacancy concentrations grown on Pt(111) by means of X-ray photoelectron spectroscopy, temperature-programmed desorption/reaction spectroscopy, and low energy electron diffraction. Hydroxyl…
Formation and characteristic properties of organized double-electrochromic films consisting of electrochromic poly(4-(2,2':6,2″-terpyridyl)phenyliminofluorene) (P-1)-zinc ion complexes and electrochromic anions are reported. The anions are 2,2'-azino-bis(3-ethylbenzo-thiazoline-6-sulfonate) (ABTS) and poly((4-sulfonat…
Abstract We report on the synthesis and catalytic properties of a class of hybrid organic–inorganic mesoporous bifunctional heterogeneous catalysts for efficient catalysis of two‐step tandem reactions in one pot. With a solvent‐assisted grafting method, two different catalytic groups, that is, an organoamine and a pal…
It is experimentally verified that a two-dimensional planar focusing antenna based on gradient-index metamaterials has a similar performance as that of its parabolic counterpart. The antenna is designed using quasi-conformal transformation optics, and is realized with non-resonant I-shaped metamaterial unit cells. It…
Parameters for CdX, SeX, and TeX (X = H, C, N, O, S, Se, Te, and Cd) have been generated within the self-consistent-charge density-functional tight-binding (SCC-DFTB) framework. The approach has been tested against ab initio density-functional theory calculations for the relevant bulk phases, surfaces, nanowires, and…
With the appropriate approximation, we have formulated the equation of multibubble motion for two cases: a filament of bubbles and a small spherical cluster of bubbles. Our results have yielded a collective mode of bubble motion in which individual bubbles of similar size expand and compress almost simultaneously. Eac…
The economic and environmentally friendly flame‐retardant compound, tetramethyl (6‐chloro‐1,3,5‐triazine‐2,4‐diyl)bis(oxy)bis(methylene) diphosphonate ( CN‐1 ), was synthesized by a simple two‐step procedure from dimethyl phosphate, and its chemical structure was characterized by 1 H, 13 C, and 31 P nuclear magnetic r…
We report a facile method of preparing few-layer graphene nanosheets (FLGs), which can be soluble in ethanol. Atomic force microscopy and high-resolution transmission electron microscopy studies reveal that FLGs have average thicknesses in the range of 2.6-2.8 nm, corresponding to 8-9 layers. A graphene/nafion composi…