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<p>In this work, the combustion energy of carboxylic acid functionalized single-walled carbon nanotubes (COOH-SWCNTs) was determined using an isoperibolic semi-micro combustion calorimeter. The value of the massic energy of combustion at <i>T</i> = 298.15&#xa0;K and <i>p</i><sup>o</sup> = 0.1&#xa0;MPa of the compound under study was obtained as Δ<sub>c</sub><i>u</i>° = − (24,110.4 ± 3.1) J&#xa0;g<sup>−1</sup>. After applying corrections for heteroatoms and metallic residues, a reduced specific energy of − (24,948.9 ± 55) J&#xa0;g<sup>−1</sup> was obtained. Consequently, the standard molar enthalpy of formation for COOH-SWCNTs was derived as Δ<sub>f</sub><i>H</i>° = − (60.03 ± 0.16) kJ&#xa0;mol<sup>−1</sup> relative to graphite. The results indicate that COOH-SWCNTs exhibit significantly higher thermodynamic stability compared to their carboxylic acid functionalized multi-walled counterparts (COOH-MWCNTs). This enhanced stability is attributed to the presence of –COOH groups at defect sites and bond ruptures, which partially oxidizes the material and lowers the energy of combustion. These findings provide a robust experimental framework for understanding the energetic interactions within single-walled mesh structures.</p>

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Enthalpy of formation of carboxylic acid functionalized single-walled carbon nanotubes by semi-micro combustion calorimetry

  • 期刊论文

  • 发表日期：

    2026年8月4日

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  • Guadalupe Mendoza-Pérez,
  • Juan Mentado-Morales,
  • Arturo Ximello-Hernández,
  • Javier Salinas-Luna,
  • Jorge Castro-López

摘要

In this work, the combustion energy of carboxylic acid functionalized single-walled carbon nanotubes (COOH-SWCNTs) was determined using an isoperibolic semi-micro combustion calorimeter. The value of the massic energy of combustion at T = 298.15 K and po = 0.1 MPa of the compound under study was obtained as Δcu° = − (24,110.4 ± 3.1) J g−1. After applying corrections for heteroatoms and metallic residues, a reduced specific energy of − (24,948.9 ± 55) J g−1 was obtained. Consequently, the standard molar enthalpy of formation for COOH-SWCNTs was derived as ΔfH° = − (60.03 ± 0.16) kJ mol−1 relative to graphite. The results indicate that COOH-SWCNTs exhibit significantly higher thermodynamic stability compared to their carboxylic acid functionalized multi-walled counterparts (COOH-MWCNTs). This enhanced stability is attributed to the presence of –COOH groups at defect sites and bond ruptures, which partially oxidizes the material and lowers the energy of combustion. These findings provide a robust experimental framework for understanding the energetic interactions within single-walled mesh structures.