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@ARTICLE{Burger:909821,
      author       = {Burger, Nikolaos A. and Meier, G. and Bouteiller, Laurent
                      and Loppinet, Benoit and Vlassopoulos, Dimitris},
      title        = {{D}ynamics and {R}heology of {S}upramolecular {A}ssemblies
                      at {E}levated {P}ressures5241},
      journal      = {The journal of physical chemistry / B},
      volume       = {126},
      number       = {35},
      issn         = {1089-5647},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {FZJ-2022-03442},
      pages        = {6713 - 6724},
      year         = {2022},
      abstract     = {A methodology to investigate the linear viscoelastic
                      properties of complex fluids at elevated pressures (up to
                      120 MPa) is presented. It is based on a dynamic light
                      scattering (DLS) setup coupled with a stainless steel
                      chamber, where the test sample is pressurized by means of an
                      inert gas. The viscoelastic spectra are extracted through
                      passive microrheology. We discuss an application to
                      hydrogen-bonding motif 2,4-bis(2-ethylhexylureido)toluene
                      (EHUT), which self-assembles into supramolecular structures
                      (tubes and filaments) in apolar solvents dodecane and
                      cyclohexane. High levels of pressure (roughly above 20 MPa)
                      are found to slow down the terminal relaxation process;
                      however, the increases in the entanglement plateau modulus
                      and the associated persistence length are not significant.
                      The concentration dependence of the plateau modulus,
                      relaxation times (fast and slow), and correlation length is
                      practically the same for all pressures and exhibits distinct
                      power-law behavior in different regimes. Within the tube
                      phase in dodecane, the relative viscosity increment is
                      weakly enhanced with increasing pressure and reaches a
                      plateau at about 60 MPa. In fact, depending on
                      concentration, the application of pressure in the tube
                      regime may lead to a transition from a viscous (unentangled)
                      to a viscoelastic (partially entangled to well-entangled)
                      solution. For well-entangled, long tubes, the extent of the
                      plateau regime (ratio of high- to low-moduli crossover
                      frequencies) increases with pressure. The collective
                      information from these observations is summarized in a
                      temperature–pressure state diagram. These findings provide
                      ingredients for the formulation of a solid theoretical
                      framework to better understand and exploit the role of
                      pressure in the structure and dynamics of supramolecular
                      polymers.},
      cin          = {IBI-4},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IBI-4-20200312},
      pnm          = {5241 - Molecular Information Processing in Cellular Systems
                      (POF4-524)},
      pid          = {G:(DE-HGF)POF4-5241},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {36018571},
      UT           = {WOS:000849329000001},
      doi          = {10.1021/acs.jpcb.2c03295},
      url          = {https://juser.fz-juelich.de/record/909821},
}