Materials Literature
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Femtosecond four-wave-mixing (FWM) experiments of individual suspended semiconducting single-walled carbon nanotubes (SWCNTs) are presented. The chiral indices of the tubes were determined by electron diffraction as (28,14) and (24,14) having diameters of 2.90 and 2.61 nm, respectively. The diameter and semiconducting…
We present a comparison of the results obtained in the antiferromagnetic (AFM) homometallic ring ${\text{Cr}}_{8}$ with the results in three heterometallic rings with a Cr ion replaced by Cd, Ni, and Fe ions, i.e., ${\text{Cr}}_{7}\text{Cd}$, ${\text{Cr}}_{7}\text{Ni}$, and ${\text{Cr}}_{7}\text{Fe}$, respectively. Th…
A new straightforward process for fabricating perfect uniaxial oriented Dion−Jacobson perovskite RbLaNb 2 O 7 thin films by excimer-laser-assisted metal organic deposition (ELAMOD) has been investigated. The oriented crystal growth occurred only as a result of excimer laser irradiation in air at 400 °C, after depositi…
Studying chemical reactions in computer simulations requires a reliable description of the atomic interactions. While for systems of moderate size precise electronic structure calculations can be carried out to determine the energy and the forces, for large systems it is necessary to employ more efficient potentials.…
The energy-filtered transmission electron microscopy (EFTEM) technique has been used to study ion-exchange processes in conductive polymer composite nanofibers. The elemental distributions of carbon, nitrogen, oxygen, chlorine, boron, phosphorus, molybdenum, and sulfur within polypyrrole-cellulose nanofibers, used as…
Poly(glycerol monomethacrylate)-stabilized polystyrene (PGMA-PS) latex particles undergo specific, pH-dependent adsorption onto regenerated cellulose film bearing surface phenylboronic acid groups (cellulose-PBA). Deposition occurs at pH 10 and is driven by the boronate ester formation with the polyol latex surface co…
Molecular encapsulation of water-soluble anionic fluorescent dye molecules, 8-anilino-1-naphthalenesulfonic acid (ANS), and its bimolecular derivative (bis-ANS), in the generation 3.5 polyamidoamine (G3.5 PAMAM) dendrimer was investigated in the bulk aqueous phase and at the polarized water|1,2-dichloroethane interfac…
A lithium ferrite with the general formula LiFe5O8 was prepared by a new variation of the ceramic method, in which high-energy mechanical milling and calcinations of Li2CO3 and Fe2O3 were used. In this paper, we present a study of the structural and electrical properties of this ceramic phase. We also investigate the…
The oxidation of ammonia (NH 3 ) and the reduction of nitrogen (N 2 ) are two important processes in chemistry. In this study, we used density functional theory calculations to investigate the adsorptions of NH x ( x = 0−3) and N 2 on IrO 2 (110) surfaces, with density of states (DOS) analysis providing information re…
We consider how all-angle negative refraction may be induced in anisotropic crystals by making use of the phonon response. We investigate the example of crystal quartz at far-infrared wavelengths. Reflection and transmission measurements confirm the expected behavior, and show relatively high transmission efficiency a…
Analytical and numerical studies are carried out on the shapes of two-dimensional and axisymmetric pendant drops hanging under gravity from a solid surface. Drop shapes with both pinned and equilibrium contact angles are obtained naturally from a single boundary condition in the analytical energy optimization procedur…
The realm of Tsai-type (YCd(6)-type) quasicrystals (QCs) and their approximants (ACs) continues to expand to the east in the periodic table. The heavy tetrel Sn is now one of the major components in the new Ca(15.0(5))Au(60.0(4))Sn(25.0(2)) (atom %) icosahedral QC and in the corresponding 1/1 and 2/1 ACs. (The 2/1 AC…
The effects of long-range and short-range interactions on the early stress–strain response and dislocation density evolution in hexagonal close-packed (hcp) metals are studied using three-dimensional discrete dislocation dynamics (DD). To examine long-range interactions, the DD code is developed such that elastic stre…
We have developed a reactive molecular dynamics (RMD) scheme to simulate irreversible polymerization of realistic polymer systems in a coarse-grained resolution. We have studied the chain propagation of styrene to polystyrene. For monodisperse polystyrene samples, we reproduce the results of equilibrium MD simulations…
We present an approach to mass produce high-quality graphene on insulator substrate. Ni dots with single or few grains were achieved by annealing. Electron backscattered diffraction indicated that almost all of the Ni dots had (111) surface that is parallel to the substrate. Single-layer graphene with good crystalline…
Pentadecanuclear cyano-bridged high spin {Mn II 9 W V 6 (CN) 48 (solv) 24 } clusters serve as bifunctional molecular building blocks in the construction of a {Mn II 9 [W V (CN) 8 ] 6 (dpe) 5 (MeOH) 10 }·14MeOH (dpe = trans -1,2-di(4-pyridyl)ethylene) organic−inorganic hybrid network of I 1 O 2 topology. The interclust…
The design and synthesis of a new class of dendritic multiferrocenyl hexagons have been achieved via [3+3] coordination-driven self-assembly. The relative distribution of dendritic and ferrocenyl subunits on the periphery of supramolecular metallocycles can be precisely controlled. The structures of all compounds are…
We present an atomic-scale theory of interface scattering of phonons in superlattices. In particular, we describe the scattering as a result of two features, mixing of atoms at interfaces and presence of dislocations at interfaces due to lattice mismatch. We apply the theory to quantitatively explain the thermal condu…
Recent experiments [C. H. Lui, L. Liu, K. F. Mak, G. W. Flynn, and T. F. Heinz, Nature (London) 462, 339 (2009)] on graphene grown on ultraflat substrates have found no rippling in graphene when subject to temperature cycling. Unsupported/unstrained films of graphene as well as films grown on various substrates on the…
Localized surface plasmon resonances of noble metal nanocrystals are powerful in enhancing a variety of linear and nonlinear optical signals and photorelated processes. Here we demonstrate the plasmonic enhancement of the light scattering from hollow mesoporous silica microspheres by attaching a dense layer of gold na…