Materials Literature
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Abstract A general approach, based on the polymer reference interaction site model (PRISM) integral equation theory, suitable for characterizing arbitrarily complex polyolefin melts is described. We tested the method by calculating the melt structures of linear polyethylene (PE) and isotactic polypropylene (iPP) and t…
Smectic blue phases (BP(sm)) are original physical systems of thermotropic liquid crystals, displaying a double geometrical frustration: the extension of chirality in the three spatial dimensions, such as classical blue phases, and the competition between smectic order and helical twist, such as twist grain boundary (…
[structure: see text] Acid-catalyzed [2 + 2] condensation reactions of polycyclic aromatic vicinal diketones including aceanthrenequinone, phenathrenequinone, and pyrene-4,5-dione with 5-mesityldipyrromethanes are outlined, and this methodology provides a flexible entry to spiro-tricyclic porphodimethenes. The porphod…
The quasistatic frequency response of a granular medium is measured by a forced torsion oscillator method, with forcing frequency ${f}_{p}$ in the range ${10}^{\ensuremath{-}4} \mathrm{Hz}$ to 5 Hz, while weak vibrations at high-frequency ${f}_{s},$ in the range 50 Hz to 200 Hz, are generated by an external shaker. Th…
Chain-chain interactions in a corona of polymers tethered to a spherical core under good solvent conditions are studied using Monte Carlo simulations. The total scattering function of the corona as well as different partial contributions are sampled. By combining the different contributions in a self-consistent approa…
We have studied the effect of strain on the electronic properties of multiwall carbon nanotubes using scanning tunneling microscopy and spectroscopy. While small elastic strain causes no change of the electronic properties of the nanotubes, tubes under large strain by lying over an inter-grain boundary of the Au subst…
Mercuric iodide, HgI2, is a substance of technological interest because of its opto-electronic properties. It is of chemical and crystallographic interest because of the wealth of different crystal structures and structural motifs it assumes. At moderate temperatures and pressures, seven different phases have been rep…
Recent full hydrodynamic simulations of a sonoluminescing bubble interior have shown that the bubble content is compressed to a very dense state during the violent collapse. In this paper, we numerically studied the shape stability of a radially oscillating gas bubble by using Hilgenfeldt et al. theoretical model with…
In this paper, the emitter of multicrystalline silicon solar cells has been chemically etched in order to form porous silicon (PS) layers, usually known as stain-etched PS, to be used at the same time as a selective emitter and as an efficient antireflective layer. The optical behaviour of the solar cells in the 250-8…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTIntrinsic Fluorescence and Quenching Effects in Photoactivated Reactively Sputtered Silver Oxide LayersChristophe Mihalcea, Dorothea Büchel, Nobufumi Atoda, and Junji TominagaView Author Information National Institute of Advanced Industrial Science and Technology, Labo…
We present results on soliton excitations in carbon nanotubes (CNT's) using Brenner's many-body potential. Our numerical simulations demonstrate high soliton stability in $(10,10)$ CNT's. The interactions of solitons and solitary excitation with CNT defect are found to be inelastic if the excitations and defects lengt…
Complexation of copper(II) bromide and chloride with 4-pyrimidinyl nitronyl nitroxide (4PMNN) as a bridging ligand gave discrete hexanuclear complexes carrying 12 spins, [CuX(2).(4PMNN)](6) [X = Br (1), Cl (2)], which crystallize in a trigonal space group. The crystallographic parameters are C(11)H(15)Br(2)CuN(4)O(2).…
Semiconductor nanowires of silicon have been synthesized within the pores of mesoporous silica using a novel supercritical fluid solution-phase approach. Mesoporous silica, formed by the hydrolysis of tetramethoxysilane (TMOS) in the presence of a triblock copolymer surfactant, was employed for the nucleation and grow…
In section 3, the effect of Doppler broadening on photodetachment microscopy interference patterns is calculated in two ways. The first way is to calculate the effect of spectral broadening directly and that yields a contrast reduction factor The second way is to estimate the imbalance of the interfering channels, in…
The syntheses of eight new star-shaped D(3)-symmetric arrays in which three 15-(pyrid-4-yl)porphyrin subunits are attached to the 1, 3, and 5 positions of a benzene core through linkers consisting of collinear repetitive phenylethynyl units have been carried out using Pd(0)-catalyzed coupling reactions. By the same pr…
The bending of a carbon nanotube is studied by considering the structural evolution of a carbon nanotorus from elastic deformation to the onset of the kinks and eventually to the collapse of the walls of the nanotorus. The changes in the electronic properties due to delocalized deformations are contrasted with those d…
Previous studies had demonstrated that the T g of polymer thin films is strongly dependent on the interactions, γ s, between the polymer and the underlying substrate. We present a study of the glass transition temperature, T g, in thin films of polystyrene, PS, as a function of film thickness and as a function of γ s…
Small drops sliding down a partially wetting substrate bifurcate between different shapes depending on their capillary number Ca. At low Ca, they are delimited by a rounded, smooth contact line. At intermediate values they develop a corner at the trailing edge, the angle of which evolves from flat to 60 degrees with i…
Controlling the surface properties of nanoparticulate materials is necessary if they are to be exploited in applications such as colloidal crystals or biolabeling. By tailoring the polymer flexibility and the electrostatic forces involved in polyelectrolyte adsorption onto highly curved gold surfaces, through variatio…
An accurate Patterson function, free of artifacts, is obtained by transforming low-energy electron diffraction I-V spectra at multiple incident angles. The demonstration is carried out using normal incidence measured spectra and calculated spectra at three angles of incidence. The errors between intensity spots in the…