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@ARTICLE{Niebuur:1038244,
      author       = {Niebuur, Bart-Jan and Pipich, Vitaliy and Appavou,
                      Marie-Sousai and Mullapudi, Dharani and Nieth, Alec and
                      Rende, Eric and Schulte, Alfons and Papadakis, Christine M.},
      title        = {{PNIPAM} {M}esoglobules in {D}ependence on {P}ressure},
      journal      = {Langmuir},
      volume       = {40},
      number       = {42},
      issn         = {0743-7463},
      address      = {Washington, DC},
      publisher    = {ACS Publ.},
      reportid     = {FZJ-2025-01280},
      pages        = {22314 - 22323},
      year         = {2024},
      abstract     = {Poly(N-isopropylacrylamide) (PNIPAM) in aqueous solution
                      forms mesoglobules above its cloud point temperature Tcp.
                      While these are small and compact at atmospheric pressure,
                      they are large and water-rich at high pressure. To identify
                      the transition between these states, we employed optical
                      microscopy and carried out isothermal pressure scans. Using
                      very small angle neutron scattering, we determined the size
                      and water content of the mesoglobules in pressure scans at
                      different temperatures above Tcp. We observe a distinct
                      transition at pressures of 35–55 MPa with the transition
                      pressure depending on temperature. While the transition is
                      smooth at high temperatures, i.e., far away from the
                      coexistence line, it is abrupt at low temperatures, i.e.,
                      close to the coexistence line. Hence, at high temperatures,
                      the swelling of the mesoglobules dominates, whereas at low
                      temperatures, the coalescence of mesoglobules prevails.
                      Subsequently decreasing the pressure results in a gradual
                      deswelling of the mesoglobules at high temperature. In
                      contrast, at low temperatures, small and compact
                      mesoglobules form, but the large aggregates persist. We
                      conclude that, on the time scale of the experiment, the
                      disintegration of the large swollen aggregates into small
                      and compact mesoglobules is only partially possible. Erasing
                      the history by cooling the sample at the maximum pressure
                      into the one-phase state does not result in qualitative
                      changes for the behavior with the only difference that Fewer
                      mesoglobules are formed when the pressure is decreased
                      again. The newly identified transition line separates the
                      low-pressure from the high-pressure regime.},
      cin          = {JCNS-1 / JCNS-4 / MLZ / JCNS-FRM-II},
      ddc          = {540},
      cid          = {I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)JCNS-4-20201012 /
                      I:(DE-588b)4597118-3 / I:(DE-Juel1)JCNS-FRM-II-20110218},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ)
                      (POF4-6G4) / 632 - Materials – Quantum, Complex and
                      Functional Materials (POF4-632)},
      pid          = {G:(DE-HGF)POF4-6G4 / G:(DE-HGF)POF4-632},
      experiment   = {EXP:(DE-MLZ)KWS3-20140101},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {39395149},
      UT           = {WOS:001337668000001},
      doi          = {10.1021/acs.langmuir.4c02952},
      url          = {https://juser.fz-juelich.de/record/1038244},
}