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@ARTICLE{Liang:887797,
      author       = {Liang, Yan and Zhou, Jini and Dong, Yawen and Klumpp, Erwin
                      and Šimůnek, Jiří and Bradford, Scott A.},
      title        = {{E}vidence for the critical role of nanoscale surface
                      roughness on the retention and release of silver
                      nanoparticles in porous media},
      journal      = {Environmental pollution},
      volume       = {258},
      issn         = {0269-7491},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2020-04427},
      pages        = {113803 -},
      year         = {2020},
      abstract     = {Although nanoscale surface roughness has been theoretically
                      demonstrated to be a crucial factor in the interaction of
                      colloids and surfaces, little experimental research has
                      investigated the influence of roughness on colloid or silver
                      nanoparticle (AgNP) retention and release in porous media.
                      This study experimentally examined AgNP retention and
                      release using two sands with very different surface
                      roughness properties over a range of solution pH and/or
                      ionic strength (IS). AgNP transport was greatly enhanced on
                      the relatively smooth sand in comparison to the rougher
                      sand, at higher pH, and lower IS and fitted model parameters
                      showed systematic changes with these physicochemical
                      factors. Complete release of the retained AgNPs was observed
                      from the relatively smooth sand when the solution IS was
                      decreased from 40 mM NaCl to deionized (DI) water and then
                      the solution pH was increased from 6.5 to 10. Conversely,
                      less than $40\%$ of the retained AgNPs was released in
                      similar processes from the rougher sand. These observations
                      were explained by differences in the surface roughness of
                      the two sands which altered the energy barrier height and
                      the depth of the primary minimum with solution chemistry.
                      Limited numbers of AgNPs apparently interacted in
                      reversible, shallow primary minima on the smoother sand,
                      which is consistent with the predicted influence of a small
                      roughness fraction (e.g., pillar) on interaction energies.
                      Conversely, larger numbers of AgNPs interacted in deeper
                      primary minima on the rougher sand, which is consistent with
                      the predicted influence at concave locations. These findings
                      highlight the importance of surface roughness and indicate
                      that variations in sand surface roughness can greatly change
                      the sensitivity of nanoparticle transport to physicochemical
                      factors such as IS and pH due to the alteration of
                      interaction energy and thus can strongly influence
                      nanoparticle mobility in the environment.},
      cin          = {IBG-3},
      ddc          = {690},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:31864922},
      UT           = {WOS:000519655100053},
      doi          = {10.1016/j.envpol.2019.113803},
      url          = {https://juser.fz-juelich.de/record/887797},
}