Author, as appears in the article.: Formentín P; Marsal LF

Department: Enginyeria Electrònica, Elèctrica i Automàtica

URV's Author/s: Formentín Vallés, Pilar / Marsal Garví, Luis Francisco

Keywords: Wettability Perfluoro-silane Oleophilic Macroporous silicon Hydrophobic Contact angle

Abstract: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. The effect of the morphology and chemical composition of a surface on the wettability of porous silicon structures is analyzed in the present work. Hydrophobic and superhydrophobic macroporous substrates are attractive for different potential applications. Herein, different hydropho-bic macroporous silicon structures were fabricated by the chemical etching of p-type silicon wafers in a solution based on hydrofluoric acid and coated with a fluoro silane self-assembled monolayer. The surface morphology of the final substrate was characterized using a scanning electron microscope. The wettability was assessed from contact angle measurements using water and organic solvents that present low surface energy. The experimental data were compared with the classical wetting states theoretical models described in the literature. Perfluoro-silane functionalized macroporous silicon surfaces presented systematically higher contact angles than untreated silicon substrates. The influence of porosity on the surface wettability of macoporous silicon structures has been estab-lished. These results suggest that the combination of etching conditions with a surface chemistry modification could lead to hydrophobic/oleophilic or superhydrophobic/oleophobic structures.

Thematic Areas: Physics, applied Nanoscience & nanotechnology Materials science, multidisciplinary Materials science (miscellaneous) Materials science (all) General materials science General chemical engineering Engenharias ii Chemistry, multidisciplinary Chemical engineering (miscellaneous) Chemical engineering (all)

licence for use: https://creativecommons.org/licenses/by/3.0/es/

Author's mail: pilar.formentin@urv.cat pilar.formentin@urv.cat lluis.marsal@urv.cat

Author identifier: 0000-0002-5976-1408

Record's date: 2023-02-19

Papper version: info:eu-repo/semantics/publishedVersion

Link to the original source: https://www.mdpi.com/2079-4991/11/3/670

Licence document URL: http://repositori.urv.cat/ca/proteccio-de-dades/

Papper original source: Nanomaterials. 11 (3): 1-11

APA: Formentín P; Marsal LF (2021). Hydrophobic/oleophilic structures based on macroporous silicon: Effect of topography and fluoroalkyl silane functionalization on wettability. Nanomaterials, 11(3), 1-11. DOI: 10.3390/nano11030670

Article's DOI: 10.3390/nano11030670

Entity: Universitat Rovira i Virgili

Journal publication year: 2021

Publication Type: Journal Publications