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@ARTICLE{Kelly:860975,
      author       = {Kelly, Elaine A. and Houston, Judith and Evans, Rachel C.},
      title        = {{P}robing the dynamic self-assembly behaviour of
                      photoswitchable wormlike micelles in real-time},
      journal      = {Soft matter},
      volume       = {15},
      number       = {6},
      issn         = {1744-6848},
      address      = {London},
      publisher    = {Royal Soc. of Chemistry},
      reportid     = {FZJ-2019-01608},
      pages        = {1253 - 1259},
      year         = {2019},
      abstract     = {Understanding the dynamic self-assembly behaviour of
                      azobenzene photosurfactants (AzoPS) is crucial to advance
                      their use in controlled release applications such as drug
                      delivery and micellar catalysis. Currently, their behaviour
                      in the equilibrium cis- and trans-photostationary states is
                      more widely understood than during the photoisomerisation
                      process itself. Here, we investigate the time-dependent
                      self-assembly of the different photoisomers of a model
                      neutral AzoPS, tetraethylene glycol
                      mono(4′,4-octyloxy,octyl-azobenzene) (C8AzoOC8E4) using
                      small-angle neutron scattering (SANS). We show that the
                      incorporation of in situ UV-Vis absorption spectroscopy with
                      SANS allows the scattering profile, and hence micelle shape,
                      to be correlated with the extent of photoisomerisation in
                      real-time. It was observed that C8AzoOC8E4 could switch
                      between wormlike micelles (trans native state) and fractal
                      aggregates (under UV light), with changes in the
                      self-assembled structure arising concurrently with changes
                      in the absorption spectrum. Wormlike micelles could be
                      recovered within 60 seconds of blue light illumination. To
                      the best of our knowledge, this is the first time the degree
                      of AzoPS photoisomerisation has been tracked in situ through
                      combined UV-Vis absorption spectroscopy-SANS measurements.
                      This technique could be widely used to gain mechanistic and
                      kinetic insights into light-dependent processes that are
                      reliant on self-assembly.},
      cin          = {JCNS-FRM-II / Neutronenstreuung ; JCNS-1},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106},
      pnm          = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
                      Neutron Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)KWS2-20140101},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:30418450},
      UT           = {WOS:000459588200009},
      doi          = {10.1039/C8SM01948G},
      url          = {https://juser.fz-juelich.de/record/860975},
}