Materials Literature
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An incommensurate composite phase with a monoclinic host-guest structure, designated $\mathrm{Sb}\text{\ensuremath{-}}\mathrm{IV}$, is found between the previously known $\mathrm{Sb}\text{\ensuremath{-}}\mathrm{I}$ and $\mathrm{Sb}\text{\ensuremath{-}}\mathrm{II}$ phases, and an incommensurate to incommensurate transi…
The continuous synthesis of fullerenes and carbon nanotubes (CNTs) in induction plasmas at the 40-kW plate power level has been studied. Kinetics calculations were conducted to predict the conditions for fullerenes formation at the high plasma temperatures. “Carbon black-iron” powder mixtures were used as starting mat…
Crystallization of helical polymers is a very big challenge for molecular simulation. It involves many significant issues, such as folding in biomolecules and molecular recognition during crystal growth. Though direct molecular simulations of the process still involve very difficult problems, we here report our recent…
Nanocrystal formation in annealed a-SiO0.17N0.07:H films, Kohli, Sandeep, Theil, Jeremy A, Dippo, Patricia C, Jones, K M, Al-Jassim, Mowafak M, Ahrenkiel, Richard K, Rithner, Christopher D, Dorhout, Peter K
Room temperature electroluminescence has been demonstrated from undoped silicon nanowires that were grown from disilane. Ensembles of nanowires were excited by capacitively coupling them to an ac electric field. The emission peak occurred at about 600 nm from wires of average diameter of about 4 nm. The emission appea…
A layered nanocomposite with poly(diallyldimethylammonium), PDDA, intercalated between manganese oxide layers can be formed on a platinum electrode in a thin film form through a direct electrochemical route. The process involves a potentiostatic oxidation of aqueous Mn(2+) precursors in the presence of PDDA by applyin…
The shape and stability of a liquid drop on a bare planar solid surface are analyzed by minimizing its total potential energy calculated microscopically. The solution of the obtained differential equation for the drop profile shows that there is a rapid variation of the angle between the tangent to the profile and the…
Electromigration phenomena in metallic lines are studied by using a biased resistor network model. The void formation induced by the electron wind is simulated by a stochastic process of resistor breaking, while the growth of mechanical stress inside the line is described by an antagonist process of recovery of the br…
We report a chemical route capable of making template-free, pure, and oriented polyaniline (PANI) nanotubes (60–130 nm in diameter) in bulk quantities containing azobenzene groups, which exhibited trans–cis photoisomerization upon irradiation with UV light. The specific morphology of the oriented PANI nanotubes with h…
The kinetics of oxidation and reduction of Al(2)O(3) supported Rh nanoparticles have been determined on a 50 millisecond timescale using energy dispersive EXAFS (EDE).
A new class of structurally simple fluorophores with strong long-wavelength emission have been developed through a very convenient procedure.
We now report photoinduced sulfur desorption from the surfaces of Au nanoparticles loaded on metal oxides. This reaction occurs in water at ordinary temperature and pressure. Nanometer-sized Au particles have been formed on the surfaces of various metal oxides by deposition-precipitation (Au/oxides). Elemental sulfur…
Copper nanoparticles have been synthesized by the flow-levitation method and coated with carbon-and-hydrogen films through the hollow-cathode glow discharge. The uncoated and coated Cu nanoparticles have been analysed by transmission electron microscopy, x-ray diffraction, and infrared absorption. Their size, dispersi…
Biologically-inspired peptide sequences have been explored as auxiliaries to mediate self-assembly of synthetic macromolecules into hierarchically organized solution and solid state nanostructures. Peptide sequences inspired by the coiled coil motif and "switch" peptides, which can adopt both amphiphilic alpha-helical…
CdS nanoparticles were successfully immobilized on multiwalled carbon nanotubes (MWNTs) via a simple solvothermal approach using dimethyl sulfoxide (DMSO) both as medium and sulfur source. The dependences of size and morphology of CdS nanoparticles on the reaction duration, Cd 2+ concentration, and medium were investi…
Progress in the development of generic molecular devices based on responsive polymers is discussed. Characterisation of specially synthesised polyelectrolyte gels, "grafted from" brushes and triblock copolymers is reported. A Landolt pH-oscillator, based on bromate/ sulfite/ferrocyanide, with a room temperature period…
Surface tension effects on the behavior of a pure vapor cavity or a cavity containing some noncondensible contents, which is growing, collapsing, and rebounding axisymmetrically near a rigid wall, are investigated numerically by the boundary integral method for different values of dimensionless stand-off parameter gam…
A method is presented for patterning polymers with nanoscale gold networks and using the pattern to measure strain in the polymer. A gold film is first coated on a porous alumina template. After coating, the template is impressed into a polymer, and the template is dissolved to leave a continuous metal network on or s…
Shear-induced smectic ordering and crystallisation of isotactic polypropylene (iPP) has been studied with in-situ small- and wide-angle X-ray scattering. Shear-induced smectic bundles with a periodicity of about 4 nm have been observed at temperatures below as well as above the melting point. This applies to iPP of di…
Textured silicon solar cells have been generally studied in the geometrical optics approximation. This description predicts no dependence of reflectance or other optical properties on the size of the texture pyramids. In this work textures are represented as two-dimensional periodic diffraction gratings and their opti…