Materials Literature
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A number of specific examples are briefly given for the use of pores in engineering materials: a porous ceramic to produce minimum thermal conduction; thin skeleton walls in silicon to produce photoluminescence; low dielectric constant materials. The desirable nature of the pores in fuel cell electrodes and sieves is…
By resonant x-ray scattering at the Mn K edge on La(7/8)Sr(1/8)MnO3, we show that an orbital polaron lattice (OPL) develops at the metal-insulator transition of this compound. This orbital reordering explains consistently the unexpected coexistence of ferromagnetic and insulating properties at low temperatures, the qu…
Well ordered bridged organosilica highly functionalised with disulfide groups were obtained by self-assembly of alpha,omega-bis(trimethoxysilyl)alkyldisulfide under hydrophilic conditions; the reduction of disulfide cores to SH groups gave rise to material having a high mercury ion adsorption capacity.
We report on the spin dynamics of $^{13}\mathrm{C}$ isotope enriched inner walls in double-wall carbon nanotubes using $^{13}\mathrm{C}$ nuclear magnetic resonance. Contrary to expectations, we find that our data set implies that the spin-lattice relaxation time (${T}_{1}$) has the same temperature ($T$) and magnetic…
The fundamental laws governing the mechanical equilibrium of solid-fluid systems were formulated in 1805 and 1806. They are Laplace’s law, which describes the pressure drop across an interface, and Young’s equation for the contact angle. At that time, these laws were justified on purely mechanical grounds. In 1880 Gib…
The phase behavior of the symmetric long-chain bolaamphiphile dotriacontan-1,1'-diyl-bis[2-(dimethylammonio)ethyl phosphate] (MePE-C32-MePE) was investigated in aqueous suspensions of different pH by transmission electron microscopy (TEM), differential scanning calorimetry (DSC), and Fourier transform infrared spectro…
Bioresorbable linear poly(ester-ether urethane)s with different hydrophilic character were synthesized from block copolymers of poly(epsilon-caprolactone)-poly(ethylene oxide)-poly(epsilon-caprolactone) (PCL-PEO-PCL) as macrodiols, and L-lysine diisocyanate (LDI). A series of PCL-PEO-PCL triblock copolymers with diffe…
Crystalline silicon forms the basis of just about all computing technologies on the planet, in the form of microelectronics. An enormous amount of research infrastructure and knowledge has been developed over the past half-century to construct complex functional microelectronic structures in silicon. As a result, it i…
Composites were prepared from thermoplastic starch and layered silicates organophilized with different surfactants. Sodium montmorillonite and silicates treated with aminododecanoic acid, stearyl dihydroxyethyl ammonium chloride and distearyl dimethyl ammonium chloride surfactants, respectively, were added to plastici…
Abstract Plasticized polylactide (PLA) – layered silicate nanocomposites were obtained by melt blending PLA with polyethylene glycol as plasticizer (20 wt %) and with different montmorillonite fillers: Cloisite® 20A, Cloisite® 25A, and Cloisite® 30B (from 1 to 10 wt %). Comparative samples of melt‐blended polylactide…
We analyze the performance of a planar lens based on realistic negative index material in a generalized geometry. We demonstrate that the conventional superlens design (where the lens is centered between the object and the image) is not optimal from the resolution point of view, develop an analytical expression for th…
This paper reports on the electrical properties of thin-film transistors (TFTs) that use polymer-coated networks of single-walled carbon nanotubes (SWNTs) as the semiconductor with source and drain electrodes formed by high-resolution printing techniques. P-channel, n-channel, and ambipolar TFTs are demonstrated with…
In this paper, porous films with a honeycomb structure were fabricated by evaporating a poly(L-lactide) solution in THF under humid conditions. The influencing factors on pattern formation were investigated, such as atmosphere humidity, solution concentration and the molecular weight. The pore sizes could be controlle…
Quenching of quantum dot luminescence by nitroxides is extremely non-linear and dependent on nanoparticle size, being most effective for the smaller particles; it is proposed to involve an electron exchange mechanism.
In this letter we show that it is possible to drastically change electric double layer capacitance, from a large increase to complete disappearance, by introducing various surface functional groups on carbon nanotubes. The introduction of surface carboxyl groups created a 3.2 times larger capacitance due to the increa…
Complex micro- and nanostructured materials for optical sensing purposes are designed and fabricated using top technologies. A completely different approach to engineering systems at the nanoscale consists in recognizing the nanostructures and morphologies that nature has optimized during life’s history on earth. We h…
This article reviews Introductory Quantum Optics by Christopher C. Gerry, Peter L. Knight . 317 pp. , New York, 2005. Price: $55.00 (paper) ISBN 0-521-52735-X.
Spherical CdSe nanocrystals capped by a CdS rod-like shell exhibit interesting spectral dynamics on the single particle level. Spectral boxcar averaging reveals a high degree of correlation between the emission energy, spectral linewidth, phonon coupling strength, and emission intensity of the single nanocrystal. The…
Abstract Polylactide (PLA)‐layered silicate nanocomposites plasticized with 20 wt % of poly(ethylene glycol) 1000 were prepared by melt blending. Three kinds of organo‐modified montmorillonites—Cloisite® 20A, Cloisite® 25A, and Cloisite® 30B—were used as fillers at a concentration level varying from 1–10 wt %. Neat PL…
Materials with a low dielectric constant are required as interlayer dielectrics for the on-chip interconnection of ultra-large-scale integration devices to provide high speed, low dynamic power dissipation and low cross-talk noise. The selection of chemical compounds with low polarizability and the introduction of por…