Silicon Nanomembranes for Efficient and Precise Molecular Separations

Smith, K.; Winans, Joshua D.; McGrath, James L.

doi:10.1002/9783527691005.ch9

Cited by 1 publication

(1 citation statement)

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“…At membrane thicknesses below roughly 100 nm, the diffusive flux of molecular species through the pores can be comparable to the convective flux, leading to a Peclet number of approximately 1 [8]. Not only is the convective flux through the ultrathin membranes much greater than conventional filters due to higher hydraulic permeability, but diffusion presents an important enhancement that is no longer insignificant and can even exceed convective transport [9]. Diffusion-based separations are also critically important in laboratory and medical applications among others.…”

Section: General 2375mentioning

confidence: 99%

Fabrication techniques enabling ultrathin nanostructured membranes for separations

Mireles

Gaborski

2017

Electrophoresis

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The fabrication of nanostructured materials is an area of continuous improvement and innovative techniques that fulfill the demand of many fields of research and development. The continuously decreasing size of the smallest patternable feature has expanded the catalog of methods enabling the fabrication of nanostructured materials. Several of these nanofabrication techniques have sprouted from applications requiring nanoporous membranes such as molecular separations, cell culture, and plasmonics. This review summarizes methods that successfully produce through-pores in ultrathin films exhibiting an approximate pore size to thickness ratio of one, which has been shown to be beneficial due to high permeability and improved separation potential. The material reviewed includes large-area, parallel, and affordable approaches such as self-organizing polymers, nanosphere lithography, anodization, nanoimprint lithography as well as others such as solid phase crystallization and nanosphere lens lithography. The aim of this review is to provide a set of inexpensive fabrication techniques to produce nanostructured materials exhibiting pores ranging from 10 to 350 nm and exhibiting a pore size to thickness ratio close to one. The fabrication methods described in this work have reported the successful manufacture of nanoporous membranes exhibiting the ideal characteristics to improve selectivity and permeability when applied as separation media in ultrafiltration.

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Section: General 2375mentioning

confidence: 99%