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- W3045984992 abstract "Abstract Since the discovery 25 years ago, many investigations have reported light-induced macroscopic mass migration of azobenzene-containing polymer films. Various mechanisms have been proposed to account for these motions. This study explores light-inert side chain liquid crystalline polymer (SCLCP) films with a photoresponsive polymer only at the free surface and reports the key effects of the topmost surface to generate surface relief gratings (SRGs) for SCLCP films. The top-coating with an azobenzene-containing SCLCP is achieved by the Langmuir–Schaefer (LS) method or surface segregation. A negligible amount of the photoresponsive skin layer can induce large SRGs upon patterned UV light irradiation. Conversely, the motion of the SRG-forming azobenzene SCLCP is impeded by the existence of a LS monolayer of the octadecyl side chain polymer on the top. These results are well understood by considering the Marangoni flow driven by the surface tension instability. This approach should pave the way toward in-situ inscription of the surface topography for light-inert materials and eliminate the strong light absorption of azobenzene, which is a drawback in optical device applications." @default.
- W3045984992 created "2020-08-03" @default.
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- W3045984992 date "2020-07-29" @default.
- W3045984992 modified "2023-10-10" @default.
- W3045984992 title "Photo-triggered large mass transport driven only by a photoresponsive surface skin layer" @default.
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- W3045984992 doi "https://doi.org/10.1038/s41598-020-69605-8" @default.
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