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Daniel José Pochapski, Caio Carvalho dos Santos, Gabriel Wosiak, Sandra H. Pulcinelli, Celso Valentim Santilli
In this work, a set of experimental electrophoretic mobility (μ e ) data was used to show how inappropriate selection of the electrokinetic model used to calculate the zeta potential (ζ-potential) can compromise the interpretation of the results for nanoparticles (NPs). The main consequences of using ζ-potential values as criteria to indicate the colloidal stability of NP dispersions are discussed based on DLVO interaction energy predictions. For this, magnetite (Fe 3 O 4 ) NPs were synthesized and characterized as a model system for performing electrokinetic experiments. The results showed that the Fe 3 O 4 NPs formed mass fractal aggregates in solution, so the ζ-potential could not be determined under ideal conditions when μ 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 ζ-potential values for the Fe 3 O 4 NPs. The DLVO interaction energy predictions for the colloidal stability of the Fe 3 O 4 NP dispersions also depended on the electrokinetic model used to calculate the ζ-potential. The results obtained for the Fe 3 O 4 NP dispersions also suggested that, contrary to many reports in the literature, high ζ-potential values do not necessarily reflect high colloidal stability for charge-stabilized NP dispersions.
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Pochapski, D. J., Santos, C. C. D., Wosiak, G., Pulcinelli, S. H., & Santilli, C. V. (2021). Zeta Potential and Colloidal Stability Predictions for Inorganic Nanoparticle Dispersions: Effects of Experimental Conditions and Electrokinetic Models on the Interpretation of Results. Langmuir, 37(45), 13379–13389. https://doi.org/10.1021/acs.langmuir.1c02056
Pochapski, Daniel José, et al. "Zeta Potential and Colloidal Stability Predictions for Inorganic Nanoparticle Dispersions: Effects of Experimental Conditions and Electrokinetic Models on the Interpretation of Results." Langmuir, vol. 37, no. 45, 2021, pp. 13379–13389, https://doi.org/10.1021/acs.langmuir.1c02056.
Pochapski, Daniel José, Caio Carvalho dos Santos, Gabriel Wosiak, Sandra H. Pulcinelli, and Celso Valentim Santilli. "Zeta Potential and Colloidal Stability Predictions for Inorganic Nanoparticle Dispersions: Effects of Experimental Conditions and Electrokinetic Models on the Interpretation of Results." Langmuir 37, no. 45 (2021): 13379–13389. https://doi.org/10.1021/acs.langmuir.1c02056.
Pochapski D. J., Santos C. C. D., Wosiak G. [и др.] Zeta Potential and Colloidal Stability Predictions for Inorganic Nanoparticle Dispersions: Effects of Experimental Conditions and Electrokinetic Models on the Interpretation of Results // Langmuir. — 2021. — Vol. 37, № 45. — P. 13379–13389. — URL: https://doi.org/10.1021/acs.langmuir.1c02056
@article{pochapski2021zeta,
title = {{Zeta Potential and Colloidal Stability Predictions for Inorganic Nanoparticle Dispersions: Effects of Experimental Conditions and Electrokinetic Models on the Interpretation of Results}},
author = {Daniel José Pochapski and Caio Carvalho dos Santos and Gabriel Wosiak and Sandra H. Pulcinelli and Celso Valentim Santilli},
journal = {Langmuir},
year = {2021},
volume = {37},
number = {45},
pages = {13379--13389},
doi = {10.1021/acs.langmuir.1c02056},
url = {https://doi.org/10.1021/acs.langmuir.1c02056}
}TY - JOUR AU - Pochapski, Daniel José AU - Santos, Caio Carvalho dos AU - Wosiak, Gabriel AU - Pulcinelli, Sandra H. AU - Santilli, Celso Valentim TI - Zeta Potential and Colloidal Stability Predictions for Inorganic Nanoparticle Dispersions: Effects of Experimental Conditions and Electrokinetic Models on the Interpretation of Results JO - Langmuir VL - 37 IS - 45 SP - 13379 EP - 13389 PY - 2021 DA - 2021/10/12 DO - 10.1021/acs.langmuir.1c02056 UR - https://doi.org/10.1021/acs.langmuir.1c02056 ER -
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