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000887797 1001_ $$0P:(DE-Juel1)138954$$aLiang, Yan$$b0
000887797 245__ $$aEvidence for the critical role of nanoscale surface roughness on the retention and release of silver nanoparticles in porous media
000887797 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2020
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000887797 520__ $$aAlthough 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.
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000887797 7001_ $$0P:(DE-HGF)0$$aZhou, Jini$$b1
000887797 7001_ $$0P:(DE-HGF)0$$aDong, Yawen$$b2
000887797 7001_ $$0P:(DE-Juel1)129484$$aKlumpp, Erwin$$b3
000887797 7001_ $$0P:(DE-HGF)0$$aŠimůnek, Jiří$$b4
000887797 7001_ $$0P:(DE-HGF)0$$aBradford, Scott A.$$b5$$eCorresponding author
000887797 773__ $$0PERI:(DE-600)2013037-5$$a10.1016/j.envpol.2019.113803$$gVol. 258, p. 113803 -$$p113803 -$$tEnvironmental pollution$$v258$$x0269-7491$$y2020
000887797 8564_ $$uhttps://juser.fz-juelich.de/record/887797/files/Liang%20et%20al._ENVPOL_2020_postprint.pdf$$yPublished on 2019-12-13. Available in OpenAccess from 2021-12-13.
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