Orientation and order of aqueous organic ions adsorbed to a solid surface

Article Abstract:

Polarized infrared spectroscopy in attenuated total reflection was used to investigate the orientation and adsorption of an aqueous organic ion having an anisotropic shape at an oxidized silicon surface with an opposite charge. The organic ion considered is the 1,4-dimethylpyridinium cation. The sticking behavior of the organic ion was found to be slightly greater than that of small inorganic ions of the same charge. Results also suggested that the organic ion at the surface act as an embryonic amphiphile.

Cations, Adsorption

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Morphological and compositional evolution of Pt-Si intermetallic thin films prepared by the activated adsorption of SiH4 on Pt(111)

Article Abstract:

The growth and evolution of Pt-Si intermetallic phases formed through chemical vapor deposition has been studied with scanning tunneling microscopy and Auger electron spectroscopy. The thin films were prepared by exposing a Pt(111) crystal to silane and then subjected to annealing treatments. Si forms clusters at the step edges which avoids centers of Pt terraces. Results indicate the clusters have an intermetallic nature with heights much larger than a Pt(111) step height.

Composition, Thin films, Crystallization, Epitaxy

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Electrostatic stitching in gel-phase supported phospholipid bilayers

Article Abstract:

Zwitterionic lipids when mixed with 20% mole % cationic lipids produce gel-phase supported lipid bilayers that are morphologically free of defects detectable using noncontact mode atomic force microscopy (AFM). A simple electrostatic argument suggests that the presence of cationic lipids might 'stitch' together the structure, even when the temperature is lowered below the gel-to-fluid phase transition.

Analysis, Lipid membranes, Atomic force microscopy, Chemical properties

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