title: Influence of nanotopography on phospholipid bilayer formation on silicon dioxide.
abstract: We have investigated the effect of well-defined nanoscale topography on the 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) lipid vesicle adsorption and supported phospholipid bilayer (SPB) formation on SiO2 surfaces using a quartz crystal microbalance with dissipation monitoring (QCM-D) and atomic force microscopy (AFM). Unilamellar lipid vesicles with two different sizes, 30 and 100 nm, were adsorbed on pitted surfaces with two different pit diameters, 110 and 190 nm, as produced by colloidal lithography, and the behavior was compared to results obtained on flat surfaces. In all cases, complete bilayer formation was observed after a critical coverage of adsorbed vesicles had been reached. However, the kinetics of the vesicle-to-bilayer transformation, including the critical coverage, was significantly altered by surface topography for both vesicle sizes. Surface topography hampered the overall bilayer formation kinetics for the smaller vesicles, but promoted SPB formation for the larger vesicles. Depending on vesicle size, we propose two modifications of the precursor-mediated vesicle-to-bilayer transformation mechanism used to describe supported lipid bilayer formation on the corresponding flat surface. Our results may have important implications for various lipid-membrane-based applications using rough or topographically structured surfaces.
authors: Department of Applied Physics, Chalmers University of Technology, SE-41296 Gothenburg, Sweden. pfeiffer@mpip-mainz.mpg.de
authors: Indriati
authors: I
authors: Pfeiffer
authors: Bastien
authors: B
authors: Seantier
authors: Sarunas
authors: S
authors: Petronis
authors: Duncan
authors: D
authors: Sutherland
authors: Bengt
authors: B
authors: Kasemo
authors: Michael
authors: M
authors: Zäch
mesh_terms: D003460:Crystallization; D008051:Lipid Bilayers / Q000737:chemistry*; D018625:Microscopy, Atomic Force; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D010743:Phospholipids / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D008051:Lipid Bilayers; D010743:Phospholipids; D012822:Silicon Dioxide