2008 NSTI Nanotechnology Conference and Trade Show - Nanotech 2008 - 11th Annual

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Clean Technology 2008

Permeability and protein separations: functional studies of porous nanocrystalline silicon membranes

J. Snyder, M. Kavalenka, D. Fang, C. Striemer, P. Fauchet, J. McGrath
University of Rochester, US

nanomembranes, protein separations

We have developed an ultrathin (15nm) freestanding nanoporous silicon based membrane [1]. This new material, termed porous nanocrystalline silicon (pnc-Si), is fabricated using standard photolithography techniques. Pore sizes can be tuned in a thermodynamically driven self-assembly step during pnc-Si manufacture. The intrinsic characteristics of this new material and its relatively facile fabrication make it superior to commercial membranes and other currently studied nanomembranes. Pnc-Si air and water flow rates are an order of magnitude higher than those reported of carbon nanotube membranes and commercial track etched membranes. We have employed pnc-Si membranes in protein separations, and because of the well defined pores, observe sharp molecular weight cutoffs of complex protein mixtures. Additionally we have used pnc-Si membranes to perform blood protein separations, and have observed separations by diffusion alone that are difficult for standard hemodialysis membranes to achieve.

Nanotech 2008 Conference Program Abstract