Morphological Transitions of a Photoswitchable Aramid Amphiphile Nanostructure

Title
Morphological Transitions of a Photoswitchable Aramid Amphiphile Nanostructure
Authors
김대윤유기현Ty Christoff-TempestaGuillaume LamourXiaobing ZuoJulia H. Ortony
Keywords
아라미드; 나노구조체; 나노필러; 복합체; 고분자; 초분자; 자기조립
Issue Date
2021-04
Publisher
Nano letters
Citation
VOL 21, NO 7-2918
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/73099
ISSN
1530-6984
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KIST Publication > Article
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