Materials Literature
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Abstract Recently, electromagnetic materials with negative permittivity and permeability values (sometime called “media with negative refraction index”) have been given much attention in the literature. Negative values of the material parameters can be achieved in composite media near resonances, which implies very di…
We present a unique method for converting circularly polarized light into radially and azimuthally polarized beams. The method is based on the use of computer-generated space-variant subwavelength metal stripe gratings. The elements were realized on GaAs substrates and produced beams with high polarization purity at a…
Abstract The transport properties of oxygen and water vapor through EVOH films as functions of relative humidity (RH) and temperature were studied. The results of oxygen and water vapor permeation demonstrated that temperature and RH markedly affected barrier properties of these films. In general, the EVOH films had m…
We model friction acting on the tip of an atomic force microscope as it is dragged across a surface at non-zero temperatures. We find that stick-slip motion occurs and that the average frictional force follows $|\ln v|^{2/3}$, where $v$ is the tip velocity. This compares well to recent experimental work (Gnecco et al,…
Carbon nanotubes are one dimensional and very narrow. These obvious facts imply that, under doping with boron and nitrogen, microscopic doping inhomogeneity is much more important than for bulk semiconductors. We consider the possibility of exploiting such fluctuations to create interesting devices. Using the self-con…
A simple Monte Carlo procedure is described for simulating the multiple scattering and absorption of electrons with the incident energy in the range 1-50 keV moving through a slab of uniformly distributed material of given atomic number, density and thickness. The simulation is based on a screened Rutherford cross-sec…
Boron nitride nanotubes (BNNTs) were synthesized in gram quantities using a continuous ${\mathrm{CO}}_{2}$ laser ablation reactor without the benefit of a metal catalyst. High-resolution transmission electron microscopy analyses have shown the samples to be composed of single-wall nanotubes organized in long and well-…
We have developed nanotweezers consisting of carbon nanotubes that will operate in an atomic force microscope. The two nanotubes were attached on the metal electrodes patterned on a conventional Si tip and their fixations were made by carbon deposition. These processes were made under the view of a scanning electron m…
Information on the energy of $5d$ levels of ${\mathrm{Ce}}^{3+}$ ions coordinated by ${\mathrm{CO}}_{3}^{2\ensuremath{-}},$ ${\mathrm{SO}}_{4}^{2\ensuremath{-}},$ ${\mathrm{PO}}_{4}^{3\ensuremath{-}},$ ${\mathrm{BO}}_{3}^{3\ensuremath{-}},$ and ${\mathrm{SiO}}_{4}^{4\ensuremath{-}}$ ionic complexes or by neutral water…
Although many experimental studies over the years have shown strong (inverse) correlation between excess viscosity and excess volume of a binary mixture, there does not seem to exist any microscopic theoretical study of such behavior. In this work, we introduce and study two new models of binary mixture with the aim o…
Direct particle sizing of colloidal suspensions at high solid concentrations is difficult due to confounding effects of multiple scattering and particle interactions. In this work, the frequency domain photon migration (FDPM) technique, based upon multiple light scattering, is extended for particle sizing of colloidal…
The photodissociation of ICN initially adsorbed at the liquid/vapor interface of chloroform is studied using classical molecular dynamics computer simulations. The photodissociation and subsequent geminate recombination on the ground state of ICN is compared with the same reaction in the bulk liquid. We find that the…
As models for inhomogeneous polymer networks, we investigate the Rouse dynamics of regular lattices built from subunits with arbitrary internal structure. We analyze as an example a two-dimensional lattice, consisting of small-world networks (SWNs). Using analytical and numerical calculations we study the stretching o…
Dicyanoaurate and dicyanoargentate ions doped in A-type zeolite were prepared and analyzed spectroscopically. Data from luminescence and Raman spectroscopies along with extended Hückel calculations indicate the formation of [M(CN) 2 - ] n oligomers (M = Ag, Au) in the zeolite host. Variations in luminescent properties…
We present a theoretical analysis of O2 adsorption on a reduced TiO2 (110) rutile surface, based on periodic ab initio Hartree–Fock calculations. Three different orientational approaches, three different spin symmetries, and two different adsorption sites are considered. We also consider the possibility that the surfa…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMMo3Se3 (M = Li+, Na+, Rb+, Cs+, NMe4+) Nanowire Formation via Cation Exchange in Organic SolutionJae Hee Song, Benjamin Messer, Yiying Wu, Hannes Kind, and Peidong YangView Author Information Department of Chemistry University of California Berkeley, California 94720…
Activated dihydridocarbonyltris(triphenylphosphine)ruthenium ( Ru ) catalyzes the dehydrogenative silylation condensation copolymerization of o -quinones with α,ω-dihydridooligodimethylsiloxanes to give high molecular weight copoly(arylene-1,2-dioxy/oligodimethylsiloxanylene)s in good chemical yield. These copolymers…
[structure: see text] The conformational properties of intramolecularly hydrogen-bonded dendrimers constructed from (S)-1,1'-bi-2-naphthol as a chiral central core are described. Circular dichroism studies revealed that chirality transfer to the periphery occurs only when sterically demanding terminal esters are emplo…
Knudsen cell mass spectrometric equilibrium measurements together with theoretical computations have been employed to gain structural and thermodynamic information of the OsC and OsC2 molecules. Several levels of theory have been applied to determine the structures, molecular parameters, and physico-chemical propertie…
The most important contribution to nonresonant vibrational nonlinear optical properties arises from nuclear relaxation (NR). In previous work a set of static field-induced vibrational coordinates (FICs) has been developed to simplify calculation of the NR contribution within the infinite optical frequency approximatio…