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Abstract <p>The functional and mechanical properties of carbon aerogels (CAG) are studied during pyrolysis to make resorcinol-formaldehyde aerogels (RFAG). The synthesis involves two different solvents: acetonitrile and dimethyl sulfoxide. The solvent to resorcinol ratio is kept at the levels of 8 and 14.5. The relationship is established between the values of the specific surface area <i>S</i>, bulk density ρ and CAG compression strength <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\sigma \)</EquationSource> <!--InMatAR2670069Kolmakova-m1--> </InlineEquation> and the properties of the original RFAG. It is found that pyrolysis leads to an increase in <i>S</i> by ~2–4 times, ρ by ~1.5–3 times and <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\sigma \)</EquationSource> <!--InMatAR2670069Kolmakova-m2--> </InlineEquation> by ~2.5–26 times, whereas the value of porosity <i>P</i> remains practically unchanged. The most noticeable change in properties is observed during pyrolysis of RFAG synthesized using dimethyl sulfoxide as a solvent with a solvent to resorcinol ratio of 8. The pyrolysis induces a significant shrinkage in samples which is less pronounced in RFAG samples obtained using a larger amount of solvent.</p>

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Relationship between Functional and Mechanical Properties of Resorcinol-Formaldehyde Aerogels and Resultant Carbon Aerogels

  • 期刊论文

  • 发表日期：

    2026年8月4日

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  • A. A. Kolmakova,
  • V. K. Ivanov,
  • A. E. Baranchikov,
  • S. A. Lermontov,
  • A. N. Malkova,
  • A. D. Filippova,
  • O. S. Ivanova,
  • A. G. Kolmakov,
  • M. A. Kaplan

摘要

Abstract

The functional and mechanical properties of carbon aerogels (CAG) are studied during pyrolysis to make resorcinol-formaldehyde aerogels (RFAG). The synthesis involves two different solvents: acetonitrile and dimethyl sulfoxide. The solvent to resorcinol ratio is kept at the levels of 8 and 14.5. The relationship is established between the values of the specific surface area S, bulk density ρ and CAG compression strength \(\sigma \) and the properties of the original RFAG. It is found that pyrolysis leads to an increase in S by ~2–4 times, ρ by ~1.5–3 times and \(\sigma \) by ~2.5–26 times, whereas the value of porosity P remains practically unchanged. The most noticeable change in properties is observed during pyrolysis of RFAG synthesized using dimethyl sulfoxide as a solvent with a solvent to resorcinol ratio of 8. The pyrolysis induces a significant shrinkage in samples which is less pronounced in RFAG samples obtained using a larger amount of solvent.