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

Author(s)

de Castro, Lucas D. C. ^[1] ; Larocca, Nelson M. ^[2] ; Oliveira, Jr., Osvaldo N. ^[1] ; Pessan, Luiz A. ^[2]

Affiliation

^[1] Univ Sao Paulo, Sao Carlos Inst Phys, BR-13566590 Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Carlos, Grad Program Mat Sci & Engn, BR-13565905 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: ACS OMEGA; DEC 2021.
• Web of Science Citations: 0

Abstract

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. (AU)

• FAPESP's process: 20/02938-0 - Coloured patterns based on bioinspired photonic crystals for mechanocromic applications
• Grantee: Lucas Daniel Chiba de Castro
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 18/22214-6 - Towards a convergence of technologies: from sensing and biosensing to information visualization and machine learning for data analysis in clinical diagnosis
• Grantee: Osvaldo Novais de Oliveira Junior
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 15/20052-0 - Development of bioinspired superhydrophobic coatings via layer-by-layer deposition
• Grantee: Lucas Daniel Chiba de Castro
• Support Opportunities: Scholarships in Brazil - Doctorate