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@ARTICLE{Burger:890562,
      author       = {Burger, Nikolaos A. and Mavromanolakis, Antonios and Meier,
                      G. and Brocorens, Patrick and Lazzaroni, Roberto and
                      Bouteiller, Laurent and Loppinet, Benoit and Vlassopoulos,
                      Dimitris},
      title        = {{S}tabilization of {S}upramolecular {P}olymer {P}hase at
                      {H}igh {P}ressures},
      journal      = {ACS Macro Letters},
      volume       = {10},
      number       = {3},
      issn         = {2161-1653},
      address      = {Washington, DC},
      publisher    = {ACS},
      reportid     = {FZJ-2021-01043},
      pages        = {321 - 326},
      year         = {2021},
      abstract     = {We utilize dynamic light scattering (DLS) and passive
                      microrheology to examine the phase behavior of a
                      supramolecular polymer at very high pressures. The monomer,
                      2,4-bis(2-ethylhexylureido)toluene (EHUT), self-assembles
                      into supramolecular polymeric structures in the nonpolar
                      solvent cyclohexane by means of hydrogen bonding. By varying
                      the concentration and temperature at atmospheric pressure,
                      the formation of the viscoelastic network (at lower
                      temperatures) and predominantly viscous phases, based on
                      self-assembled tube and filament structures, respectively,
                      has been established. The associated changes in the
                      rheological properties have been attributed to a structural
                      thickness transition. Here, we investigate the effects of
                      pressure variation from atmospheric up to 1 kbar at a given
                      concentration. We construct a temperature–pressure diagram
                      that reveals the predominance of the viscoelastic network
                      phase at high pressures. The transition from the
                      viscoelastic network organization of the tubes to a weaker
                      viscous-dominated structure of the filaments is rationalized
                      by using the Clapeyron equation, which yields an associated
                      volume change of about 8 Å3 per EHUT molecule. This change
                      is further explained by means of Molecular Dynamics
                      simulations of the two phases, which show a decrease in the
                      molecular volume at the filament-tube transition,
                      originating from increased intermolecular contacts in the
                      tube with respect to the filament. These findings offer
                      insights into the role of pressure in stabilizing
                      self-assemblies.},
      cin          = {IBI-4},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IBI-4-20200312},
      pnm          = {524 - Molecular and Cellular Information Processing
                      (POF4-524)},
      pid          = {G:(DE-HGF)POF4-524},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000636739700003},
      doi          = {10.1021/acsmacrolett.0c00834},
      url          = {https://juser.fz-juelich.de/record/890562},
}