285943 Nanostructured Polymer Membranes with Sub-1-Nm Pores for Molecular Size Separations Via the Cross-Linking of Lyotropic Liquid Crystal Assemblies

Tuesday, October 30, 2012: 9:00 AM
401 (Convention Center )
Richard D. Noble, Department of Chemical and Biological Engineering, University of Colorado, Boulder, CO, Douglas L. Gin, University of Colorado, Boulder, CO, Brian Weisenauser, Chemistry and Biochemistry, University of Colorado, Boulder, CO and Blaine Carter, Chemical and Biological Engineering, University of Colorado, Boulder, CO

The development of polymers with ordered, interconnected, sub-1-nm size pores for molecular size separation is presented.  These nanostructured polymers are made by cross-linking lyotropic liquid crystal (LLC) assemblies formed by polymerizable surfactants in the presence of water.  Supported LLC polymer membranes with a type I bicontinuous cubic (QI) architecture made with a 1st-generation gemini phosphonium LLC monomer possess a 3-D interconnected water pore system with a uniform pore size of ca. 0.75 nm.  These LLC membranes are able to cleanly size-exclude hydrated salt ions and a variety of small organic solutes from water (i.e., water desalination) with good permeabilities. The water desalination/nanofiltration performance of this LLC polymer membrane is superior to that of conventional nanofiltration membranes, and close to that of commercial reverse-osmosis membranes.  The relationship between the nanoscale architecture of these polymerized LLC assemblies and their separation will be discussed.  The synthesis of a new, more modular QI-phase LLC monomer platform, and the separation performance of new LLC membranes made from this monomer, will also be presented.

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See more of this Session: Session I In Honor of Prof William Krantz
See more of this Group/Topical: Separations Division