Materials Literature
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Density functional calculations of the electronic structure of the Fe${}_{12}$ cluster encapsulated inside finite single-wall zigzag carbon nanotubes of indices $(11,0)$ and $(10,0)$ have been performed. Several Fe${}_{12}$ isomers have been considered, including elongated shape isomers aimed to fit well inside the na…
Abstract Three polymeric polyoxometalate (POM) compounds, [PMo VI 10 Mo V 2 O 39 ](C 2 N 4 H 4 ) 2 [(CH 3 ) 4 N] 3 · H 2 O ( 1 ), [PW 11 CuO 39 ] 2 · [Cu(en) 2 H 2 O] 4 · [(CH 3 ) 4 N] 2 · 6H 2 O (en = ethenediamine) ( 2 ), and [SiW 11 CuO 39 ] 2 · [Cu(en) 2 ] 4 · [Cu(en) 2 H 2 O] 2 · 10H 2 O ( 3 ) were isolated under…
Electronic doping and screening effects in stacked graphene flakes on Ru and Cu substrates have been observed using scanning tunneling microscopy (STM). The screening affects the apparent STM height of each flake in successive layers reflecting the density of states near the Fermi level and thus the doping level. It i…
Abstract 6,7‐Bis[3‐( N ϵ ‐ tert ‐butyloxycarbonyllysine methyl ester)]‐1,3,5,8‐tetramethyl‐2,4‐divinylporphyrin ( 3 ) was synthesized and successfully immobilized in a silica matrix by a sol–gel method. Protoporphyrin (PP)‐derived amide 3 showed much higher photostability than its parent PP‐IX. Its UV/Vis absorption,…
The proposed model allows to analyze reasons for surface enhanced Raman scattering (SERS) by molecules adsorbed onto surface of metal particles. It considers multiple inelastic scattering of a photon, which moves along a closed loop inside a system of closely packed small metallic particles. During this motion, the ph…
We report the creation of a multiferroic field effect device with a BiFeO 3 (BFO) (antiferromagneticferroelectric) gate dielectric and a La 0:7 Sr 0:3 MnO 3 (LSMO) (ferromagnetic) conducting channel that exhibits direct, bipolar electrical control of exchange bias. We show that exchange bias is reversibly switched bet…
We introduce a variant of the banded random matrix ensemble and show, using detailed numerical analysis and theoretical arguments, that the phonon heat current in disordered quasi-one-dimensional lattices obeys a one-parameter scaling law. The resulting β function indicates that an anomalous Fourier law is applicable…
Abstract The soft chemical route was used in the synthesis of undoped and 5% Mn doped ZnO nanocrystalline powders. XRD, TEM, TGA/DTA, FTIR, and superconducting quantum interference device techniques were used to study the structural, nano/microstructural, thermal decomposition and metastability aspects as a function o…
Channel access resistance (Rsd) effects on the charge carrier mobility (μ) and low-frequency noise (LFN) in a polymethyl-methacrylate (PMMA) passivated tin-oxide nanowire (SnO2-NW) field effect-transistor were investigated. To this end, the Y function method was employed for direct electrical parameters extraction wit…
A simple and practical procedure to facilitate the determination of the design space for seeded cooling crystallization is proposed and demonstrated. Solute supersaturation is used as an effective link between six operational process factors and a chosen critical quality attribute, namely, fines fraction in the crysta…
In control: A facile solvothermal method was developed to construct core–shell Al2O3@CuO submicrospheres with a controllable shell thickness. Remarkably, the Al2O3@CuO submicrospheres have a much higher activity for CO oxidation than conventional supported CuO/Al2O3 catalysts prepared by a combination of impregnation…
Transformation electromagnetics has opened possibilities for designing antenna structures. Using an analytical approach, we demonstrate here how directive antenna radiation can be achieved from an omnidirectional source behind a diffuse surface. This diffuse surface has been obtained by an optical transformation of a…
The room-temperature photoluminescence (PL) spectra of hydrothermal grown ZnO film and nanowires coated with Al are investigated, which exhibit much less UV emission enhancement ratio as against that of nanowires fabricated by thermal evaporation method. A model is suggested at last to interpret the experimental resul…
We demonstrate modulations of electrical conductance and hysteresis behavior in ZnO nanowire transistors via electrically polarized switching of ferroelectric liquid crystal (FLC). After coating a nanowire channel in the transistors with FLCs, we observed large increases in channel conductance and hysteresis width, an…
A series polyacrylamide/Na-montmorillonite nanocomposites was prepared by in situ free radical polymerization in aqueous medium using benzoyl peroxide (Bz 2 O 2 ) as a radical initiator. To characterize the resultant nanocomposites, Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microsco…
A feature common to various solids, including single-alkali (SA) and mixed-alkali (MA) glasses, is a frequency-dependent ionic conductivity that shows the power law and the linear behavior with frequency. In spite of the advances made, the origin of this behavior continues to be controversial. We report our measuremen…
Fluorescence quenching effects on graphene or hydrogen-terminated graphene covered sliver nanoparticles are studied and the results are explained with energy transfer models. The fluorescence signal of R6G is suppressed by the graphene flakes via Förster resonance energy transfer and by the silver nanoparticles via su…
Parsons–Lee approach is formulated for the isotropic–nematic transition in a binary mixture of oblate hard spherocylinders and hard spheres. Results for the phase coexistence and for the equation of state in both phases for fluids with different relative size and composition ranges are presented. The predicted behavio…
This paper addresses a wideband reflector constructed using just a single-layer subwavelength grating with multi-subpart profiles. The properties of the grating reflector are investigated by rigorous coupled-wave analysis. It is shown that for a transverse electric (TE) polarized wave, over a broadband spectrum of 1.4…
Halloysite nanotubes (HNTs) have been used as a new type of filler for acrylonitrile–butadiene rubber (NBR) matrix. The NBR/HNT nanocomposites were prepared using a two-roll mill by adding 0–7 parts per hundred rubber (phr) HNTs, and the effect of the loading of HNTs on the curing behavior, mechanical, and microstruct…