The substitution of perfluorinated substances (PFAS) as chemical applied in anti-adhesive and hydrophobic applications has become an urgent need, due to raising concerns for their potential hazard. In this framework, chitosan-based coatings represent a promising alternative because of their properties of non-toxicity, biodegradability, and sustainability as raw materials. Our work developed modified chitosan-based coatings, with a fine-tuning of transparency and superhydrophobicity (Figure 1). Chitosan-based fluorine-free superhydrophobic coatings were obtained via functionality modification through esterification and amidation reaction with stearoyl chloride, followed by freeze-drying and coating deposition using a novel solvent-free approach followed by thermal treatment. A full characterization of the modified-chitosan was performed to assess its chemico-physical properties and confirmed the functionality modification. The application of an innovative and sustainable deposition method demonstrates to be effective in tuning the coating properties of transparency and superhydrophobicity, combining durability under physical abrasion.
Tagliaro, I., Seccia, S., Pellegrini, B., Bertini, S., Antonini, C. (2023). Chitosan-based Fluorine-free Superhydrophobic Coatings. Intervento presentato a: International Conference of the European Chitin Society (EUCHIS 2023), Siglufjörður, Iceland.
Chitosan-based Fluorine-free Superhydrophobic Coatings
Tagliaro, I;Seccia, S;Pellegrini, B;Antonini, C
2023
Abstract
The substitution of perfluorinated substances (PFAS) as chemical applied in anti-adhesive and hydrophobic applications has become an urgent need, due to raising concerns for their potential hazard. In this framework, chitosan-based coatings represent a promising alternative because of their properties of non-toxicity, biodegradability, and sustainability as raw materials. Our work developed modified chitosan-based coatings, with a fine-tuning of transparency and superhydrophobicity (Figure 1). Chitosan-based fluorine-free superhydrophobic coatings were obtained via functionality modification through esterification and amidation reaction with stearoyl chloride, followed by freeze-drying and coating deposition using a novel solvent-free approach followed by thermal treatment. A full characterization of the modified-chitosan was performed to assess its chemico-physical properties and confirmed the functionality modification. The application of an innovative and sustainable deposition method demonstrates to be effective in tuning the coating properties of transparency and superhydrophobicity, combining durability under physical abrasion.
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