WARF: P150015US01

Gemini Surfactant LLC Membranes from Thiol-Ene Polymerizations


Mahesh Mahanthappa, James Jennings

The Wisconsin Alumni Research Foundation (WARF) is seeking commercial partners interested in developing a more efficient method for synthesizing the kinds of highly desirable surfactants and LLC membranes prized in a range of chemical and industrial fields.
OVERVIEWLyotropic liquid crystal (LLC) assemblies are useful for highly selective chemical separations, such as water desalination and selective ion-transporting membranes. Bicontinuous cubic LLC assemblies are an especially useful subset because high-symmetry Q-phases, exemplified by the gyroid (G) phase, are ideal for membrane applications.

UW–Madison researchers recently developed a new class of Gemini (“twin-tail”) dicarboxylate surfactants that readily form bicontinuous cubic phases, including the gyroid phase (see WARF reference numbers P120009US01 and P120048US02). They continue to refine their methods and materials.
THE INVENTIONThe researchers have now developed a new and highly efficient approach for synthesizing crosslinkable Gemini surfactants that can be turned into membranes featuring the desired gyroid morphology.

In the new method, an LLC structure is formed from a mixture containing the functionalized surfactants, a thiol-ene crosslinking agent and a polar solvent. Upon crosslinking, the lyotropic phase morphology is substantially retained.
  • Development of new selective ion-transporting membranes
  • Protective clothing
  • Filtration, desalination and water purification
  • Exchange membranes for fuel cells
  • Lithium ion battery separators
  • Streamlines synthesis and potential for roll-to-roll manufacture
  • Cuts the number of production steps
  • Achieves desired phases over large concentration ranges and temperature windows
  • Improves yield
  • Utilizes commercially available starting materials
Contact Information
For current licensing status, please contact Mark Staudt at or 608-960-9845.
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