Preparation of Asymmetric Al2O3-SiO2 Janus Nanoparticles in Aqueous Phase and Its Interfacial Property

In this study, asymmetric Al2O3-SiO2 Janus nanoparticles with a dumbbell-like structure were synthesized by a facile chemical process in the aqueous phase. Prior to synthesis, Al2O3 nanoparticles in hydrosol were amino-modified using 3-aminopropyl triethoxysilane (KH550) and then carboxyl acid-funct...

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Bibliographic Details
Published in:Materials 2024-03, Vol.17 (6), p.1251
Main Authors: Jia, Xinli, Xiao, Peiwen, Yang, Liqiang, Luo, Jianhui, He, Meiying, Wang, Pingmei, Jiang, Bo, Xiao, Bo
Format: Article
Language:English
Subjects:
Aluminum oxide
Asymmetry
Chemical synthesis
Chemicals
Composite materials
Contact angle
Emulsion polymerization
Fourier transforms
Interfacial properties
Methods
Morphology
Nanomaterials
Nanoparticles
Photon correlation spectroscopy
Polymers
Ring opening
Silicon dioxide
Zeta potential
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Summary:In this study, asymmetric Al2O3-SiO2 Janus nanoparticles with a dumbbell-like structure were synthesized by a facile chemical process in the aqueous phase. Prior to synthesis, Al2O3 nanoparticles in hydrosol were amino-modified using 3-aminopropyl triethoxysilane (KH550) and then carboxyl acid-functionalized using a ring-opening reaction of the amine functions with succinic anhydride, imparting unique anionic properties to the Al2O3 end. SiO2 nanoparticles were rendered hydrophobic through modification with hexamethyldisilazane (HMDS) and further functionalized with 3-chloropropyl triethoxysilane (KH230). The two nanoparticle hydrosols were then mixed, and the asymmetric Al2O3-SiO2 Janus nanoparticles were synthesized via the reaction between the –NH2 and −CH2Cl groups. The prepared Janus nanoparticles were primarily characterized by dynamic light scattering (DLS), Zeta potential (ZP), and transmission electron microscopy (TEM). The results indicated that about 90% of the modified Al2O3 and SiO2 nanoparticles were covalently coupled in a one-to-one manner to form the dominant dumbbell-like structure. These Janus nanoparticles exhibit amphiphilic properties, making them highly promising surfactants for emulsifying oil–water mixtures.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma17061251