Communication Dans Un Congrès Année : 2025

Wetting properties of titanium surfaces tuned by duplex treatments combining nanosecond laser treatment and chemical functionalization

Résumé

Duplex treatments combining different processing methods open up a wide range of possibilities for modifying the surface properties of materials. In the case of titanium, nanosecond laser treatments have demonstrated their ability to induce a surface oxidation layer whose stoichiometry and properties depend on treatment conditions [1-2]. The covalent grafting of organic molecules onto the surface of titanium oxide films [3-4] opens up interesting prospects for controlling the hydrophobicity and biocompatibility of titanium surfaces, as well as for developing self-cleaning surfaces, sensors, photocatalytic supports, etc. [3]. The aim of the present work is to tune the wetting properties of metallic titanium by laser-assisted surface oxidation followed by chemical functionalization to produce hydrophobic to superhydrophobic surfaces. A Q-switched and frequency-doubled Nd:YAG green laser (KALUTI) operating at 532 nm and delivering 5 ns pulse duration was used for laser treatments on CP-Ti plates. They produced a saw-tooth patterned surface covered by an oxidized surface layer containing mainly TiO2-anatase [5]. The chemical modification of laser-treated surfaces with octylphosphonic acid (OPA) in form of tetrahydrofuran (THF) or boiling water solutions was performed. The effect of concentrations of modifier going from 0.01 to 100 mM on the resulting organic load, layer structure and contact angles was investigated. The duplex-treated surfaces were characterized by SEM-EDS/WDS, XPS, XRD and Raman spectroscopy. OPA solutions in THF were found to give rise exclusively to monolayer formation (16 ± 5 Å), with surface coverage completed at a phosphorus concentration of around 4.8 at.% according to XPS results. Concentrated OPA solutions in water produced an additional layer of titanium (IV) octylphosphonate, bringing the total thickness of the organic layer to 37 ± 11 Å at a maximum phosphorus concentration of approx. 8 at.%. Despite the different nature of the organic layers, all surfaces containing at least 2.2 at.% P showed a similar static contact angle of around 155°. Based on dynamic contact angle measurements, superhydrophobic behavior was confirmed for surfaces bearing a full OPA monolayer and titanium phosphonate (IV) overlays. [1] F. Torrent et al., Surf. Coat. Technol. 255 (2014) 146–152 [2] Z. Liu et al., Biosurf. Biotribol., 8(2022) 95–120 [3] L. D. Trino et al., Colloids and Surfaces A 546 (2018) 168–178 [4] I. Tomashchuk et al., Appl. Surf. Sci. 609 (2023) 155390 [5] N. Zaitseva et al. , Adv. Eng. Mater. (2024) 2401046.

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Est complété par hal-05297819 Poster dans une conférence Nataliya Shevchenko Zaitseva, Iryna Tomashchuk, Anna Krystianiak, Virgil Optasanu, Jean-Marie Jouvard, et al.. Wetting properties of titanium surfaces tuned by duplex treatments combining nanosecond laser treatment and chemical functionalization. FEMS EUROMAT 2025, Sep 2025, Granada (Spain), Spain. ⟨hal-05297819⟩

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Dates et versions

hal-05322462 , version 1 (20-10-2025)

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  • HAL Id : hal-05322462 , version 1

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Nataliya Shevchenko Zaitseva, Iryna Tomashchuk, Anna Krystianiak, Virgil Optasanu, Jean-Marie Jouvard, et al.. Wetting properties of titanium surfaces tuned by duplex treatments combining nanosecond laser treatment and chemical functionalization. FEMS EUROMAT 2025, Sep 2025, Granada (Spain), Spain. ⟨hal-05322462⟩
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