Electrochemical study of the pore structure of sandstone and similar media

Article Abstract:

An electrochemical study has been made of the pore structure of sandstone and similar materials, fritted glass samples, with the goal of characterizing porous minerals, looking at tortuosity and porosity. The pores of the sample were filled with aqueous solution containing probe ion. Transport of the ion across the medium was then induced. The rate of passage and the time or frequency dependence give information about the structure of the pores. Three methods can be used to look at internal geometry of a porous insulator electrochemically. Each involves soaking with aqueous electrolyte solution and putting the lower face of the sample in contact with a mercury pool electrode; the other electrode used is also a mercury pool one, but in one technique it is remote and in the others it floods the upper surface of the sample.

Fourier transform infrared spectroscopy, Impedance (Electricity), Sandstone, Minerals, Minerals (Geology)

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Gold nanoclusters reductively deposited on porous silicon: morphology and electronic structures

Article Abstract:

Gold nanoclusters have been reductively deposited on porous silicon and the morphology and electronic structures have been studied. Silicon was the reducing agent and the substrate for the gold complex ions, negative AuCl4, in aqueous solution. The object was to put nanoparticles of gold on the surface of the porous silicon. Preparation conditions have a major effect on morphology of the deposits and on porous silicon from a p-type wafer, especially. Gold nanoparticles were observed and compared to bulk gold metal using three methods. The nanoparticles varied from strings that were about 10 nm to almost spherical clusters on the order of 10 nm to micrometric groups of clusters on the order of 10 nm.

Morphology (Biology), Nanotechnology, Materials, Semiconductor wafers, X-ray spectroscopy, Gold, Morphology, Silicon

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