Abstract
Stearic acid (SA) has a low grafting density on silica nanoparticle (NP) surfaces. However, alumina coating on the particle surface effectively increases the surface reactivity with SA, significantly increasing the grafting density of SA. When the alumina coating amount reaches 15 %, the grafting density of SA increases by 350 % compared to that of the reference sample, while the water contact angle reaches 124°. The coated alumina is chemically bonded to the surfaces of the SiO2 particles. After alumina coating, the particle surface is loaded with electron acceptor sites with strong electron-receiving ability, allowing SA to undergo Lewis acid–base reactions with the particle surface.
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