Morphological Transitions of a Photoswitchable Aramid Amphiphile Nanostructure
- Morphological Transitions of a Photoswitchable Aramid Amphiphile Nanostructure
- 김대윤; 유기현; Ty Christoff-Tempesta; Guillaume Lamour; Xiaobing Zuo; Julia H. Ortony
- 아라미드; 나노구조체; 나노필러; 복합체; 고분자; 초분자; 자기조립
- Issue Date
- Nano letters
- VOL 21, NO 7-2918
- Self-assembly of small amphiphilic molecules in water can lead to nanostructures of varying geometries with pristine internal molecular organization. Here we introduce a photoswitchable aramid amphiphile (AA), designed to exhibit extensive hydrogen bonding and robust mechanical properties upon self-assembly, while containing a vinylnitrile group for photoinduced cis-trans isomerization. We demonstrate spontaneous self-assembly of the vinylnitrile-containing AA in water to form nanoribbons. Upon UV irradiation, trans-to-cis isomerizations occur concomitantly with a morphological transition from nanoribbons to nanotubes. The nanotube structure persists in water for over six months, stabilized by strong and collective intermolecular interactions. We demonstrate that the nanoribbon-to-nanotube transition is reversible upon heating and that switching between states can be achieved repeatedly. Finally, we use electron microscopy to capture the transition and propose mechanisms for nanoribbon-to-nanotube rearrangement and vice versa. The stability and switchability of photoresponsive AA nanostructures make them viable for a range of future applications.
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