Superhydrophobic to superhydrophilic wettability transition of functionalized SiO2 nanoparticles

Lilia Guadalupe Arellano-Galindo; Ana Cecilia Reynosa-Martínez; Juniet Rebeca Gaitán-Arévalo; María Fernanda Valerio-Rodríguez; Gregorio Vargas-Gutiérrez; Eddie López-Honorato

doi:10.1016/j.ceramint.2022.04.137

Superhydrophobic to superhydrophilic wettability transition of functionalized SiO₂ nanoparticles

Lilia Guadalupe Arellano-Galindo, Ana Cecilia Reynosa-Martínez, Juniet Rebeca Gaitán-Arévalo, María Fernanda Valerio-Rodríguez, Gregorio Vargas-Gutiérrez, Eddie López-Honorato

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Abstract

The superhydrophobic and superhydrophilic surfaces and their transitions are of great interest for the production of self-cleaning, anti-biofouling, or corrosion-resistant materials. This work reports the wettability transition from superhydrophobic to superhydrophilic SiO₂ nanoparticles functionalized with 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (POTS) and induced by temperature. The functionalization of these nanoparticles was confirmed by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy. The functionalization of SiO₂ nanoparticles with POTS resulted in superhydrophobic surfaces with water contact angles up to 157°. A sudden transition to superhydrophilic behavior with water contact angles (WCA) below 5° was observed when the sample was heat-treated at 500 °C, despite the presence of fluorine on the surface of these nanoparticles, as confirmed by XPS and transmission electron microscopy. XPS suggested that the transition was caused by the change in orientation of the fluoroalkyl molecules and its partial decomposition due to the loss of the –CF₃ group, resulting in shorter chains with a tail-end group with C–O bonds, which promoted the superhydrophilicity.

Original language	English
Pages (from-to)	21672-21678
Number of pages	7
Journal	Ceramics International
Volume	48
Issue number	15
DOIs	https://doi.org/10.1016/j.ceramint.2022.04.137
State	Published - Aug 1 2022

Funding

This work was supported by a grant from the Secretaría de Energía and Consejo Nacional de Ciencia y Tecnología (SENER- CONACYT ) as part of the Mexican Center for Innovation in Ocean Energy (CEMIE-Océano, project number 249795 ). The authors would like to acknowledge CONACYT for the MSc and PhD scholarships awarded to Lilia Arellano Galindo, Juniet Gaitan Arevalo, María Fernanda Valerio-Rodríguez, and Ana Cecilia Reynosa-Martínez. This work was supported by a grant from the Secretaría de Energía and Consejo Nacional de Ciencia y Tecnología (SENER-CONACYT) as part of the Mexican Center for Innovation in Ocean Energy (CEMIE-Océano, project number 249795). The authors would like to acknowledge CONACYT for the MSc and PhD scholarships awarded to Lilia Arellano Galindo, Juniet Gaitan Arevalo, María Fernanda Valerio-Rodríguez, and Ana Cecilia Reynosa-Martínez. Notice: This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ).

Keywords

Functional applications
Interfaces
SiO
Surfaces

Access to Document

10.1016/j.ceramint.2022.04.137

Cite this

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title = "Superhydrophobic to superhydrophilic wettability transition of functionalized SiO2 nanoparticles",

abstract = "The superhydrophobic and superhydrophilic surfaces and their transitions are of great interest for the production of self-cleaning, anti-biofouling, or corrosion-resistant materials. This work reports the wettability transition from superhydrophobic to superhydrophilic SiO2 nanoparticles functionalized with 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (POTS) and induced by temperature. The functionalization of these nanoparticles was confirmed by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy. The functionalization of SiO2 nanoparticles with POTS resulted in superhydrophobic surfaces with water contact angles up to 157°. A sudden transition to superhydrophilic behavior with water contact angles (WCA) below 5° was observed when the sample was heat-treated at 500 °C, despite the presence of fluorine on the surface of these nanoparticles, as confirmed by XPS and transmission electron microscopy. XPS suggested that the transition was caused by the change in orientation of the fluoroalkyl molecules and its partial decomposition due to the loss of the –CF3 group, resulting in shorter chains with a tail-end group with C–O bonds, which promoted the superhydrophilicity.",

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AU - Valerio-Rodríguez, María Fernanda

AU - Vargas-Gutiérrez, Gregorio

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