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Reduced Graphene Oxide–Polytetrafluoroethylene Composite Aerogels, Their High Hydrophobicity and Superhydrophilicity

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Abstract—

Composite aerogels based on reduced graphene oxide (rGO) and polytetrafluoroethylene (PTFE) have been synthesized at different component ratios. It has been found by the sessile droplet method that the external surface is highly hydrophobic with water contact angles of 166–170°. The porous structure of aerogel granules has been studied by the standard contact porosimetry method (SCPM). The porosimetric curves obtained with the use of octane and water intersect in the region of small pores, thereby indicating that the specific surface area of the aerogel with respect to water is much larger than that with respect to octane, in spite of the fact that octane is known to wet all materials almost ideally. This phenomenon, which we have classified as superhydrophilicity, is explained by swelling of the sample in water in the region of mesopores due to the hydration of the –CO and –COH surface groups, which have been identified by IR spectroscopy. Thus, the granules of the rGO–PTFE composite aerogel, which have a highly hydrophobic outside surface, have a superhydrophilic inside surface in the area of small pores, which is a unique phenomenon. It has also been found that the degree of superhydrophilicity decreases with an increase in the fraction of PTFE in the aerogels. The reasons for the high hydrophobicity of the external surface of aerogel particles have been considered.

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Authors and Affiliations

  1. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071, Moscow, Russia

    Yu. M. Volfkovich & V. E. Sosenkin

  2. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia

    S. A. Baskakov, E. N. Kabachkov & Y. M. Shulga

Authors
  1. Yu. M. Volfkovich
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  2. V. E. Sosenkin
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  3. S. A. Baskakov
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  4. E. N. Kabachkov
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  5. Y. M. Shulga
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Correspondence to Yu. M. Volfkovich.

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Translated by V. Kudrinskaya

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Volfkovich, Y.M., Sosenkin, V.E., Baskakov, S.A. et al. Reduced Graphene Oxide–Polytetrafluoroethylene Composite Aerogels, Their High Hydrophobicity and Superhydrophilicity. Colloid J 84, 394–403 (2022). https://doi.org/10.1134/S1061933X22040123

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  • DOI: https://doi.org/10.1134/S1061933X22040123

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