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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Zeta Potential and Colloidal Stability Predictions for Inorganic Nanoparticle Dispersions: Effects of Experimental Conditions and Electrokinetic Models on the Interpretation of Results

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Author(s):
Pochapski, Daniel Jose [1] ; dos Santos, Caio Carvalho [1] ; Leite, Gabriel Wosiak [1, 2] ; Pulcinelli, Sandra Helena [1] ; Santilli, Celso Valentim [1]
Total Authors: 5
Affiliation:
[1] Sao Paulo State Univ UNESP, Inst Chem, BR-14800060 Araraquara, SP - Brazil
[2] Fed Univ Sao Carlos UFSCar, Chem Dept, BR-13565905 Sao Carlos, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Langmuir; v. 37, n. 45, p. 13379-13389, NOV 16 2021.
Web of Science Citations: 0
Abstract

In this work, a set of experimental electrophoretic mobility (mu(e)) data was used to show how inappropriate selection of the electrokinetic model used to calculate the zeta potential (zeta-potential) can compromise the interpretation of the results for nanoparticles (NPs). The main consequences of using zeta-potential values as criteria to indicate the colloidal stability of NP dispersions are discussed based on DLVO interaction energy predictions. For this, magnetite (Fe3O4) NPs were synthesized and characterized as a model system for performing electrokinetic experiments. The results showed that the Fe3O4 NPs formed mass fractal aggregates in solution, so the zeta-potential could not be determined under ideal conditions when mu(e) depends on the NP radius. In addition, the Dukhin number (Du) estimated from potentiometric titration results indicated that stagnant layer conduction (SLC) could not be neglected for this system. The electrokinetic models that do not consider SLC grossly underestimated the zeta-potential values for the Fe3O4 NPs. The DLVO interaction energy predictions for the colloidal stability of the Fe3O4 NP dispersions also depended on the electrokinetic model used to calculate the zeta-potential. The results obtained for the Fe3O4 NP dispersions also suggested that, contrary to many reports in the literature, high zeta-potential values do not necessarily reflect high colloidal stability for charge-stabilized NP dispersions. (AU)

FAPESP's process: 14/50249-8 - Green chemistry: sustainable synthetic methods employing benign solvents, safer reagents, and bio-renewable feedstock
Grantee:Arlene Gonçalves Corrêa
Support Opportunities: Research Grants - Research Centers in Engineering Program
FAPESP's process: 14/50948-3 - INCT 2014: advanced eco-efficient technologies in cementitious products
Grantee:Vanderley Moacyr John
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 18/24383-0 - Coupled electrochemical and microwave synthesis of new optimized electrode materials
Grantee:Gabriel Wosiak Leite
Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 17/11986-5 - Generation and storage of New Energy: bringing technological development for the country
Grantee:Ana Flávia Nogueira
Support Opportunities: Research Grants - Research Centers in Engineering Program