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Slow polymer diffusion on brush-patterned surfaces in aqueous solution
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DOI：10.1039/c9nr00341j.png)
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Abstract
En 中文
A model system for the investigation of diffusional transport in compartmentalized nanosystems is described. Arrays of corrals enclosed within poly[oligo(ethylene glycol)methyl ether methacrylate] (POEGMA) walls were fabricated using double-exposure interferometric lithography to deprotect aminosilane films protected by a nitrophenyl group. In exposed regions, removal of the nitrophenyl group enabled attachment of an initiator for the atom-transfer radical polymerization of end-grafted POEGMA (brushes). Diffusion coefficients for poly(ethylene glycol) in these corrals were obtained by fluorescence correlation spectroscopy. Two modes of surface diffusion were observed: one which is similar to diffusion on the unpatterned surface and a very slow mode of surface diffusion that becomes increasingly important as confinement increases. Diffusion within the POEGMA brushes does not significantly contribute to the results.
Keywords:
FLUORESCENCE CORRELATION SPECTROSCOPY
LATERAL DIFFUSION
PLASMA-MEMBRANE
LIPID-BILAYERS
E-CADHERIN
MODEL
RECEPTOR
PROTEIN
MOTION
COEFFICIENT
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