New Si units! Only very recently has it been shown that it is possible to prepare nanotubes from silicon. The impact of such materials could be enormous in, amongst other fields, the electronics industry. Initial studies have shown that there is some complexity in understanding these materials and some diversity from their carbon-based cousins (the image shows various possible nanotubes, viewed parallel and perpendicular to the plane of the page).
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Perepichka et al. (2005) studied this question.
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