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Cited by 137Graphene research and applicationsElectrostatics and Colloid InteractionsGraphite, nuclear technology, radiation studies

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Size-dependent aggregation of graphene oxide

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Szabo, Tamas, Maroni, Plinio, Szilagyi, Istvan·2020·Carbon
DOI 10.1016/j.carbon.2020.01.022
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Abstract

Graphene oxides (GO) of highly polydisperse size distribution were prepared by the Brodie method and their dispersion stability was characterized. Exfoliation and fractionation led to well-defined particle populations in the Nano, classical Colloidal (submicron) and Micrometer size ranges, as revealed by atomic force microscopy and light scattering measurements. Time-resolved dynamic light scattering experiments revealed that aggregation processes are fully impeded in the intermediate pH regime of 3–13 in the absence of electrolytes. While the resistance against salt-induced aggregation increases with the pH due to the progressive ionization of the surface functional groups of GO sheets, their dispersions are inherently unstable at supramillimolar concentrations of strong acids and submolar concentrations of bases, in line with the DLVO theory. However, the aggregation behavior quantified by the critical coagulation concentrations (CCCs) shows surprisingly substantial platelet size dependence. The CCC of Nano Brodie-GO reaches 360 mm at pH = 12, which is one of the highest values ever reported for GO aqueous dispersions. These results provide useful quantitative information to design processable GO dispersions of pH- and size-tunable stability for future applications.

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Metadata

Authors
Szabo, T., Maroni, P., & Szilagyi, I.
Affiliations
University of Geneva (CH)
ORCID
Szabo, Tamas
Venue
Carbon
Publisher
Elsevier BV
Published
2020-04
Volume
160
Pages
145-155
ISSN
0008-6223 (ISSN-L)
DOI
10.1016/j.carbon.2020.01.022
OpenAlex
W3000685112
Cited by
137
References
0
Citations by year
2026: 16 · 2025: 23 · 2024: 16 · 2023: 29 · 2022: 19 · 2021: 17 · 2020: 17
FWCI
7.98
Type
journal article
Language
en
Open access
Licence
Locations
  • Carbon (publishedVersion, cc-by)
  • SZTE Publicatio Repozitórium (University of Szeged) (acceptedVersion, other-oa)
  • Repository of the Academy's Library (Library of the Hungarian Academy of Sciences) (acceptedVersion)
Funders
  • Nemzeti Fejlesztési Minisztérium (20391-3/2018/FEKUSTRAT)
  • Szegedi Tudományegyetem (4529)
  • Nemzeti Kutatási, Fejlesztési és Innovaciós Alap
  • Université de Genève
  • Emberi Eroforrások Minisztériuma
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › Graphene research and applications
  • Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Electrostatics and Colloid Interactions
  • Physical Sciences › Materials Science › Materials Chemistry › Graphite, nuclear technology, radiation studies
Keywords
graphene oxide, dispersion stability, critical coagulation concentration, pH-dependent stability, salt-induced aggregation, DLVO theory, aqueous dispersions

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