期刊
NANO LETTERS
卷 21, 期 7, 页码 2912-2918出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c05048
关键词
Small-molecule self-assembly; aramid amphiphile; photoisomerization; nanoribbon; nanotube
类别
资金
- National Science Foundation [CHE-1945500]
- Professor Amar G. Bose Research Grant Program
- Abdul Latif Jameel Water and Food Systems Lab
- Korea Institute of Science and Technology [2E31332]
- National Research Foundation of Korea [2021R1R1R1004226]
- National Science Foundation Graduate Research Fellowship Program [1122374]
- University of Evry Paris-Saclay
The passage introduces a photoswitchable aramid amphiphile that self-assembles in water to form nanostructures, with a reversible transition from nanoribbons to nanotubes upon UV irradiation. The stability and switchability of the photoresponsive AA nanostructures make them suitable for a range of future applications. Mechanisms for the nanoribbon-to-nanotube rearrangement and vice versa are proposed based on electron microscopy observations.
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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