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Scanning tunneling microscopy of ethylated Si(111) surfaces prepared by a chlorination/alkylation process

Article Abstract:

Computational modeling and scanning tunneling microscopy (STM) are used to study the structure of ethyl-terminated Si(111) surfaces, which are prepared by using a two-step chlorination/alkylation approach. The data is found to be consistent with a model in which Si(111) can be alkylated in a highly exoergic reaction to form a high coverage of ethyl groups and has indicated that the resultant surface structure has ordered regions consistent with ethylation of the atop sites of an unreconstructed Si(111) 1 by 1 surface as well as less ordered regions.

Silicon, Usage, Scanning tunneling microscopy, Chlorination, Chemical properties

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Crystalline, shape, and surface anisotropy in two crystal morphologies of superparamagnetic cobalt nanoparticles by ferromagnetic resonance

Article Abstract:

Superparamegnetic cobalt nanoparticles (NP's) with different crystalline structures and sizes raging from 4 to 9 nm in diameter is investigated using ferromagnetic resonance (FMR) techniques. The results from both single crystalline and polycrystalline cobalt NP's reveal that a particle's effective anisotropy and thus its magnetic properties, are extremely sensitive to internal structure and overall shape.

Cobalt Compounds, Anisotropy, Spectra

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Applied magnetic field rejects the coating of ferromagnetic carbon from the surface of ferromagnetic cobalt: RAPET of CoZr2(acac)2(O(super i)Pr)8

Article Abstract:

The results of the RAPET (reaction under autogenic pressure at elevated temperatures) dissociation of CoZr2(acac)2(O(super i)Pr)8 at 700 degree Celsius in a closed Swagelok cell under an applied magnetic field of 10 T are presented. It produces a mixture of carbon-coated and noncoated metastable ZrO2 nanoparticles, bare metallic Co nanoparticles, and bare carbon.

Zirconium Compounds, Magnetic fields, Magnetic properties, Carbon compounds

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