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In this work, we have described the characterization of hybrid silica nanoparticles of 50 nm size, showing outstanding size homogeneity, a large surface area, and remarkable CO 2  sorption/desorption capabilities. A wide battery of techniques was conducted ranging from spectroscopies such as: UV-Vis and IR, to microscopies (SEM, AFM) and CO 2  sorption/desorption isotherms, thus with the purpose of the full characterization of the material. The bare SiO 2  (50 nm) nanoparticles modified with 3-aminopropyl (triethoxysilane), APTES@SiO 2  (50 nm), show a remarkable CO 2  sequestration enhancement compared to the pristine material (0.57 vs. 0.80 mmol/g respectively at 50 °C). Furthermore, when comparing them to their 200 nm size counterparts (SiO 2  (200 nm) and APTES@SiO 2  (200 nm)), there is a marked CO 2  capture increment as a consequence of their significantly larger micropore volume (0.25 cm 3 /g). Additionally, ideal absorbed solution theory (IAST) was conducted to determine the CO 2 /N 2  selectivity at 25 and 50 °C of the four materials of study, which turned out to be >70, being in the range of performance of the most efficient microporous materials reported to date, even surpassing those based on silica.

APTES-Based Silica Nanoparticles as a Potential Modifier for the Selective Sequestration of CO2 Gas Molecules