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dc.contributor.authorNakano, Yuriko
dc.contributor.authorOchiai, Asumi
dc.contributor.authorKawamoto, Keisuke
dc.contributor.authorTakeda, Ayaka
dc.contributor.authorIchiyoshi, Kenta
dc.contributor.authorOhnuki, Toshihiko
dc.contributor.authorHochella, Michael F. Jr.
dc.contributor.authorUtsunomiya, Satoshi
dc.description.abstractTo understand the competing effects of the components in extracellular substances (ES), polymeric substances (PS) and low-molecular-weight small substances (SS) <1 kDa derived from microorganisms, on the colloidal stability of cerium dioxide nanoparticles (CeNPs), we investigated their adsorption to sparingly soluble CeNPs at room temperature at pH 6.0. The ES was extracted from the fungus S. cerevisiae. The polypeptides and phosphates in all components preferentially adsorbed onto the CeNPs. The zeta potentials of ES+CeNPs, PS+CeNPs, and SS+CeNPs overlapped on the plot of PS itself, indicating the surface charge of the polymeric substances controls the zeta potentials. The sizes of the CeNP aggregates, 100-1300 nm, were constrained by the zeta potentials. The steric barrier derived from the polymers, even in SS, enhanced the CeNP dispersibility at pH 1.5-10. Consequently, the PS and SS had similar effects on modifying the CeNP surfaces. The adsorption of ES, which contains PS+SS, can suppress the aggregation of CeNPs over a wider pH range than that for PS only. The present study addresses the non-negligible effects of small-sized molecules derived from microbial activity on the migration of CeNP in aquatic environments, especially where bacterial consortia prevail.en_US
dc.description.sponsorshipJapan Society for the Promotion of Science [16K12585, 16H04634, JP26257402]; Basic Research Fund of the Radioactive Waste Management Funding and Research Center
dc.format.extent11 pages
dc.publisherSpringer Nature
dc.rightsCreative Commons Attribution 4.0 International
dc.subjectcerium oxide nanoparticles
dc.subjectnatural organic-matter
dc.subjectaggregation kinetics
dc.subjecttio2 nanoparticles
dc.subjectenvironmental fate
dc.titleThe competing effects of microbially derived polymeric and low molecular-weight substances on the dispersibility of CeO2 nanoparticlesen_US
dc.typeArticle - Refereed
dc.description.notesThe authors would like to thank the members of the bio-actinide group at JAEA. This work was partially supported by the Grant-in-Aid for Scientific Research (KAKENHI) from the Japan Society for the Promotion of Science (16K12585, 16H04634, No. JP26257402), and the Basic Research Fund of the Radioactive Waste Management Funding and Research Center.
dc.title.serialScientific Reports

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