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Title: Morphological Transitions of a Photoswitchable Aramid Amphiphile Nanostructure

Journal Article · · Nano Letters
 [1];  [2]; ORCiD logo [3];  [4];  [5]; ORCiD logo [2]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Korea Institute of Science and Technology (Korea)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. University of Evry (France); Univ. Paris-Saclay, Gif-sur-Yvette (France)
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  5. Korea Institute of Science and Technology (Korea)

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. This stability and switchability of photoresponsive AA nanostructures make them viable for a range of future applications.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF); Korea Institute of Science and Technology (KIST); National Research Foundation of Korea (NRF)
Grant/Contract Number:
AC02-06CH11357; 1122374; 2021R1R1R1004226; 2E31332; P30-ES002109; CHE-1945500
OSTI ID:
1833817
Journal Information:
Nano Letters, Vol. 21, Issue 7; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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