skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: The competing effects of microbially derived polymeric and low molecular-weight substances on the dispersibility of CeO2 nanoparticles

Abstract

To 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.

Authors:
; ; ; ; ; ; ORCiD logo;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1427912
Report Number(s):
PNNL-SA-132531
Journal ID: ISSN 2045-2322
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
Microbially; Dispersibility of CeO2; Nanoparticles

Citation Formats

Nakano, Yuriko, Ochiai, Asumi, Kawamoto, Keisuke, Takeda, Ayaka, Ichiyoshi, Kenta, Ohnuki, Toshihiko, Hochella, Michael F., and Utsunomiya, Satoshi. The competing effects of microbially derived polymeric and low molecular-weight substances on the dispersibility of CeO2 nanoparticles. United States: N. p., 2018. Web. doi:10.1038/s41598-018-21976-9.
Nakano, Yuriko, Ochiai, Asumi, Kawamoto, Keisuke, Takeda, Ayaka, Ichiyoshi, Kenta, Ohnuki, Toshihiko, Hochella, Michael F., & Utsunomiya, Satoshi. The competing effects of microbially derived polymeric and low molecular-weight substances on the dispersibility of CeO2 nanoparticles. United States. doi:10.1038/s41598-018-21976-9.
Nakano, Yuriko, Ochiai, Asumi, Kawamoto, Keisuke, Takeda, Ayaka, Ichiyoshi, Kenta, Ohnuki, Toshihiko, Hochella, Michael F., and Utsunomiya, Satoshi. Mon . "The competing effects of microbially derived polymeric and low molecular-weight substances on the dispersibility of CeO2 nanoparticles". United States. doi:10.1038/s41598-018-21976-9.
@article{osti_1427912,
title = {The competing effects of microbially derived polymeric and low molecular-weight substances on the dispersibility of CeO2 nanoparticles},
author = {Nakano, Yuriko and Ochiai, Asumi and Kawamoto, Keisuke and Takeda, Ayaka and Ichiyoshi, Kenta and Ohnuki, Toshihiko and Hochella, Michael F. and Utsunomiya, Satoshi},
abstractNote = {To 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.},
doi = {10.1038/s41598-018-21976-9},
journal = {Scientific Reports},
issn = {2045-2322},
number = 1,
volume = 8,
place = {United States},
year = {2018},
month = {2}
}