Abstract
Line arrays of poly(methacrylic acid) brush gratings (PBGs) were prepared to hybridize azobenzene (Azo) cationic surfactants. The change in the free volume of the Azo unit between the cis-state and its trans counterpart under 365-nm irradiation resulted in geometrical-parameter variations of the PBGs. The effective refractive index (neff) of the PBGs changed from 1.202 to 1.245 under 365-nm irradiation. To observe the color change under 365-nm irradiation, the correlation between the reflection wavelength and the reflection angle at a diffraction order ranging from 1 to 5 was established to obtain the optimal observation angle. The PBG exhibited yellow light initially, which was observed at 60°–70° by the naked eye. This is consistent with our prediction. The yellow changed to red under irradiation at 365 nm and returned to yellow under irradiation at 460 nm. The photomechanical (contraction and expansion) color of the dry polymer brush was reversible with repeated irradiation cycles, indicating potential for applications in photomanipulable sensors or actuators.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
