Enhancing Carbon Dioxide Solubility and Interfacial Behavior in Saline Systems Using Diamine-Functionalized Silica Nanoparticles
- Department of Chemical Engineering, Om. C., Islamic Azad University, Omidiyeh, Iran
- Department of Petroleum Engineering, Om. C., Islamic Azad University, Omidiyeh, Iran
- Department of Petroleum Engineering, Marv. C., Islamic Azad University, Marvdasht, Iran
- Department of Chemistry, Om. C., Islamic Azad University, Omidiyeh, Iran
Received: 2025-11-15
Revised: 2025-12-15
Accepted: 2025-12-30
Published in Issue 2025-12-30
Copyright (c) 2025 Moslem Cheraghi, Mohammad Amin Gholamzadeh, Amin Azdarpour, Ali Borsalani, Mohammad Reza Asghari Ganjeh (Author)

This work is licensed under a Creative Commons Attribution 4.0 International License.
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Abstract
Understanding and enhancing carbon dioxide (CO₂) solubility and interfacial behavior in saline aqueous systems are critical for improving the efficiency of subsurface CO₂ sequestration and related applications. In this study, diamine-functionalized silica nanoparticles were synthesized using N-(2-aminoethyl)-3-aminopropyltrimethoxysilane (AEAPTMS) and systematically evaluated for their ability to enhance CO₂ solubility and reduce CO₂ –brine interfacial tension (IFT) under reservoir-relevant conditions. CO₂ solubility measurements were conducted in fresh water, formation brine (FB), and single-salt solutions with controlled ionic strength over a wide range of temperatures (25–80 °C) and pressures (up to 300 bar). The results show that the synthesized nanoparticles significantly enhance CO₂ solubility in both low- and high-salinity environments, with an optimal nanoparticle concentration of 2000 ppm. Despite the strong salting-out effect observed at elevated ionic strength, nanoparticle addition consistently mitigated salinity-induced solubility reduction. IFT measurements further confirmed that AEAPTMS-functionalized silica nanoparticles effectively reduce CO₂–brine IFT across all investigated pressures. The combined solubility and interfacial results demonstrate that surface-engineered silica nanoparticles provide a robust and effective strategy for improving CO₂ –aqueous phase interactions in complex brine systems. This work offers new mechanistic insights into nanoparticle-assisted CO₂ behavior and highlights the potential of chemically tailored nanomaterials for enhancing CO₂ storage performance in saline reservoirs.
Keywords
- AEAPTMS-functionalized silica nanoparticles,
- CO₂ solubility,
- CO₂ sequestration,
- FB,
- IFT
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