8 research outputs found

    Sorption Properties of Carbon Composite Materials Formed from Layered Clay Minerals

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    Selective and non-selective excitation/ionization processes in analytical glow discharges: excitation of the ionic spectra in argon/helium mixed plasmas

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    The increasing use of mixed gases, including helium mixtures, in glow discharge mass spectrometry has led to a need to understand the resulting signal enhancements due to changes in excitation and ionization processes. To understand more fully these processes in glow discharge, we have carried out complementary optical emission spectrometry experiments. The presence of added gases in the plasma gas can cause major changes in the number density of plasma gas ions and metastable atoms and so affects the intensities of spectral lines involving selective and non-selective excitation & ionization processes. We report the results of an experimental investigation on the effect of Ar/He mixed plasmas on the relative emission intensities of various analyte materials including copper, iron and titanium. Selective and non-selective excitation processes which are mainly dependent on the nature of the plasma gas and analyte material are observed and discussed

    Structural and optical anisotropy of nanoporous anodic aluminum oxide

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    Porous aluminum oxide has stimulated considerable interest as a nanostructural template, primarily because of the self-organized formation of extremely well-aligned cylindrical pores. One of the fascinating aspects is the tunability of the interpore distance and pore diameter by simple variation of the anodization parameters such as voltage and electrolyte solution composition. Apart from the application of aluminum oxide films as filtration membranes, they are frequently used to fabricate nanowires with large aspect ratios. Many different materials, such as metals, both magnetic and nonmagnetic, semiconductors, nanotubes, and even heterostructures, have been grown in the porous membranes using primarily electrodeposition. Furthermore, porous aluminum oxide membranes have also been used as humidity sensors, or as cathodes for organic light-emitting diodes
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