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    An Efficient Substrate-Free Method of Producing SiO2-Based Nanoparticles for Superhydrophobic Applications

    Year: 2022

    Journal: ACS Omega, Volume 7, JAN 11, page 1259–1263

    Authors: de Castro, Lucas D. C.; Larocca, Nelson M.; Oliveira Jr, Osvaldo N.; Pessan, Luiz A.

    Organizations: Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior, Brasil (CAPES) [001]; CNPq; INEO; FAPESP [2015/20052-0, 2020/02938-0, 2018/22214-6]

    We report on the preparation of SiO2-based nanoparticles readily available for superhydrophobic applications. In contrast to usual approaches, our process is substrate-free and based on electrostatic adsorption of small SiO2 particles onto large SiO2 cores with the aid of poly(diallyldimethylammonium chloride) followed by calcination and chemical modification with trichlorododecylsilane. The as-prepared nanoparticles are in powder form and exhibit stable superhydrophobic behavior at room temperature because of the unique combination between the hierarchical raspberry-like structure and low surface energy. If properly stored, the nanoparticles retain their functional properties for several months.
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