• Tas, Niels R.
• Gardeniers, Han
• Berenschot, Erwin J. W.
• Malankowska, Magdalena
• Tiggelaar, Roald M.
• Mallada, Reyes
• Pina, María Pilar
• Schlautmann, Stefan

Abstract

The novel concept of a microfluidic chip with an integrated three-dimensional fractal geometry with nanopores, acting as a gas transport membrane, is presented. The method of engineering the 3D fractal structure is based on a combination of anisotropic etching of silicon and corner lithography. The permeation of oxygen and carbon dioxide through the fractal membrane is measured and validated theoretically. The results show high permeation flux due to low resistance to mass transfer because of the hierarchical branched structure of the fractals, and the high number of the apertures. This approach offers an advantage of high surface to volume ratio and pores in the range of nanometers. The obtained results show that the gas permeation through the nanonozzles in the form of fractal geometry is remarkably enhanced in comparison to the commonly-used polydimethylsiloxane (PDMS) dense membrane. The developed chip is envisioned as an interesting alternative for gas-liquid contactors that require harsh conditions, such as microreactors or microdevices, for energy applications. ; The authors would like to acknowledge the financial support from the Government of Aragon and the Education, Audiovisual and Culture Executive Agency (EU-EACEA) within the EUDIME—“Erasmus Mundus Doctorate in Membrane Engineering” program (FPA 2011-0014, SGA 2012-1719, http://eudime.unical.it). ; Peer reviewed

Topics

• impedance spectroscopy
• pore
• surface
• Carbon
• Oxygen
• anisotropic
• Silicon
• etching
• lithography