Abstract
Dumbbell-like SiO2 nanoparticles were synthesized by a simple chemical process in aqueous phase. Prior to the preparation, 3-aminopropyl triethoxysilane (KH550) and 3-chloropropyl triethoxysilane (KH230) were used as modifiers for the surface modification of SiO2 nanoparticles in SiO2 hydrosol. By mixing the SiO2 hydrosol modified by KH550 and KH230, respectively, the dumbbell-like SiO2 nanoparticles were obtained via the reaction between the –NH2 and –CH2Cl groups on the surface of the two SiO2 nanoparticles. The dumbbell-like SiO2 nanoparticles were characterized by dynamic light scattering (DLS), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS). The results showed that the modified SiO2 nanoparticles are covalently coupled in a one-to-one manner. Detailed DLS analysis indicated that about 90% of the single nanoparticles were involved in the coupling reaction and formed new dumbbell-like SiO2 nanoparticles when the ratio of the two kinds of surface modified SiO2 was 1:1. Furthermore, the dumbbell-like SiO2 nanoparticles can be deployed as particle emulsifiers for stabilizing oil-water model systems during emulsification.
Highlights
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Asymmetric SiO2 nanoparticles with dumbbell-like structure has been successfully synthesized in a one-to-one coupling manner in aqueous phase.
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About 90% of the single SiO2 nanoparticles were transformed into new dumbbell-like SiO2 nanoparticles in the 1:1 hybrid system.
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The asymmetric dumbbell-like SiO2 nanoparticles can be used as stabilizers in oil-water system.
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Acknowledgements
The authors gratefully acknowledge the support from Key Laboratory of Nano Chemistry (KLNC), Petro China. We are thankful to Experimental Testing Center College of Chemistry, Sichuan University for their help in sample analysis.
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Jia, X., Xiao, P., Luo, J. et al. Synthesis of asymmetric dumbbell-like SiO2 nanoparticles in aqueous phase and their emulsification properties. J Sol-Gel Sci Technol 105, 152–162 (2023). https://doi.org/10.1007/s10971-022-05984-w
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DOI: https://doi.org/10.1007/s10971-022-05984-w