title: A class of supported membranes: formation of fluid phospholipid bilayers on photonic band gap colloidal crystals.
abstract: We report the formation of a new class of supported membranes consisting of a fluid phospholipid bilayer coupled directly to a broadly tunable colloidal crystal with a well-defined photonic band gap. For nanoscale colloidal crystals exhibiting a band gap at the optical frequencies, substrate-induced vesicle fusion gives rise to a surface bilayer riding onto the crystal surface. The bilayer is two-dimensionally continuous, spanning multiple beads with lateral mobilities which reflect the coupling between the bilayer topography and the curvature of the supporting colloidal surface. In contrast, the spreading of vesicles on micrometer scale colloidal crystals results in the formation of bilayers wrapping individual colloidal beads. We show that simple UV photolithography of colloidal crystals produces binary patterns of crystal wettabilities, photonic stopbands, and corresponding patterns of lipid mono- and bilayer morphologies. We envisage that these approaches will be exploitable for the development of optical transduction assays and microarrays for many membrane-mediated processes, including transport and receptor-ligand interactions.
authors.affiliation: Department of Applied Science, University of California, Davis, CA 95616, USA.
authors.forename: Adrian M
authors.initials: AM
authors.lastname: Brozell
authors.forename: Michelle A
authors.initials: MA
authors.lastname: Muha
authors.forename: Babak
authors.initials: B
authors.lastname: Sanii
authors.forename: Atul N
authors.initials: AN
authors.lastname: Parikh
mesh_terms: D003102:Colloids / Q000737:chemistry*; D036681:Fluorescence Recovery After Photobleaching; D057927:Hydrophobic and Hydrophilic Interactions; D008051:Lipid Bilayers / Q000138:chemical synthesis* / Q000737:chemistry; D010713:Phosphatidylcholines / Q000737:chemistry; D010743:Phospholipids / Q000138:chemical synthesis* / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D014966:Xanthenes / Q000737:chemistry
chemical_list: D003102:Colloids; D008051:Lipid Bilayers; D010713:Phosphatidylcholines; D010743:Phospholipids; D014966:Xanthenes; D012822:Silicon Dioxide; C034657:Texas red; C028694:1-palmitoyl-2-oleoylphosphatidylcholine