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Polyelectrolyte Surface Diffusion in a Nanoslit Geometry
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DOI：10.1021/acs.macromol.9b02365.png)
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摘要
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The surface diffusion of poly-L-lysine (PLL) in a planar nanoslit was studied using convex lens-induced confinement (CLiC) single-molecule tracking microscopy. Three surface chemistries were employed to understand the interplay of electrostatic and short-range interactions: an amine-functionalized silica surface, an oligo(ethylene oxide) (OEG)-modified surface, and a 1:1 mixture of the two ligands. Effective surface diffusion coefficients increased rapidly with slit height until saturating for slit heights <30 nm. While diffusion at a semi-infinite interface was significantly faster for OEG surfaces, the diffusion coefficient increased most rapidly with slit height for amine-functionalized surfaces, resulting in surface diffusion within very thin slits being nearly independent of surface chemistry. Intermittent random walks were simulated within a planar slit geometry, using experimentally measured parameters obtained from diffusion at a single interface to account for the characteristic short-range interactions between PLL and each surface chemistry, and were in good agreement with experimental measurements.
Keyword:
ELECTROSTATIC INTERACTIONS
TRANSPORT PHENOMENA
POLYMER
ADSORPTION
CONFINEMENT
DYNAMICS
DNA
SIMULATION
DESORPTION
REGIMES
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5.2
论文数:
3.7W
被引数:
9.4W
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