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<p>This study used graphene oxide (GO) as a carrier to construct a novel graphene oxide composite material exhibiting both controllable amphiphilicity and interfacial regulation properties. Through a synergistic “silane coupling-zwitterionic betaine” grafting strategy, the amphiphilic surfactant CAB was anchored onto the GO surface via the KH550 molecular bridge, and the successful synthesis was confirmed by SEM, FTIR, XPS, and <sup>1</sup>H NMR analyses. Interfacial performance tests showed that the graphene oxide-based composite can achieves ultralow oil-water interfacial tension (&lt; 0.1 mN·m<sup>− 1</sup>) at a low concentration of 0.5&#xa0;g·L<sup>− 1</sup> and significantly enhance the hydrophilicity of quartz substrates, reducing the contact angle from 88.5° to 42.2°, demonstrating excellent interfacial activity and wettability-altering capability. Thermogravimetric analysis revealed that the material maintains good thermal stability within 100–250&#xa0;°C, meeting the requirements of high-temperature reservoirs. Furthermore, molecular dynamics simulations elucidated its microscopic interfacial mechanism, showing that GO-KH550-CAB forms a dense adsorption layer at the oil-water interface, weakens the interfacial density gradient, suppresses water-molecule diffusion, and enhances affinity toward the oil phase. This work provides a new strategy for designing amphiphilic graphene-based colloidal materials for oil-water interfacial regulation and offers potential guidance for their application in enhanced oil recovery.</p>

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Construction of an amphiphilic GO-KH550-CAB colloidal system for oil–water interfacial regulation and molecular dynamics analysis

  • 期刊论文

  • 发表日期：

    2026年7月13日

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  • Fuzhen Liu,
  • Ming Hao,
  • Junying Wang,
  • Xuesong Zhang,
  • Yuxin Zhang,
  • Yao Wang,
  • Zhou Yang

摘要

This study used graphene oxide (GO) as a carrier to construct a novel graphene oxide composite material exhibiting both controllable amphiphilicity and interfacial regulation properties. Through a synergistic “silane coupling-zwitterionic betaine” grafting strategy, the amphiphilic surfactant CAB was anchored onto the GO surface via the KH550 molecular bridge, and the successful synthesis was confirmed by SEM, FTIR, XPS, and 1H NMR analyses. Interfacial performance tests showed that the graphene oxide-based composite can achieves ultralow oil-water interfacial tension (< 0.1 mN·m− 1) at a low concentration of 0.5 g·L− 1 and significantly enhance the hydrophilicity of quartz substrates, reducing the contact angle from 88.5° to 42.2°, demonstrating excellent interfacial activity and wettability-altering capability. Thermogravimetric analysis revealed that the material maintains good thermal stability within 100–250 °C, meeting the requirements of high-temperature reservoirs. Furthermore, molecular dynamics simulations elucidated its microscopic interfacial mechanism, showing that GO-KH550-CAB forms a dense adsorption layer at the oil-water interface, weakens the interfacial density gradient, suppresses water-molecule diffusion, and enhances affinity toward the oil phase. This work provides a new strategy for designing amphiphilic graphene-based colloidal materials for oil-water interfacial regulation and offers potential guidance for their application in enhanced oil recovery.