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    Physicochemical and magnetic properties of functionalized lanthanide oxides with enhanced hydrophobicity

    Year: 2021

    Journal: Appl. Surf. Sci., Volume 542, MAR 15

    Authors: Kujawa, Joanna; Al-Gharabli, Samer; Wrzeszcz, Grzegorz; Knozowska, Katarzyna; Lagzdins, Renars; Talik, Ewa; Dziedzic, Arkadiusz; Loulergue, Patrick; Szymczyk, Anthony; Kujawski, Wojciech

    Organizations: National Science Centre, Poland [2017/26/D/ST4/00752]; Franco-Polish Hubert Curien's Partnership Program Polonium -CAMPUS France PHC Polonium 2019 [PPN/BIL/2018/1/00222, 42903VH]

    Keywords: Lanthanide oxide; Functionalization; Physicochemistry; Superhydrophobicity; Petal and lotus effect

    According to the developed bioinspired method in the one-step procedure, the material with the petal effect was switched to lotus one. Therefore, highly hydrophobic and super-hydrophobic materials with tunable adhesive properties and fractal-like structures were successfully produced with high efficiency (67-84%). The work's essence was to modify chemically selected powders of lanthanide oxides (CeO2, Pr6O11, Nd2O3, and Gd2O3). High effectiveness of the functionalization process with 1H,1H,2H,2H-perfluorooctyltriethoxysilane (FC6) and n-octyltriethoxysilane (C6) was proven by various techniques, e.g. XPS, HR-TEM, ATR, XRD, zeta potential. Materials with water contact angle between 143.6 degrees (CeO2-C6) and 175.5 degrees (Nd2O3-FC6) with thermally stable nanolayer (up to 380 degrees C) were generated. Surfaces functionalized with FC6 possessed a polar component of surface free energy (SFE) close to zero. Water behavior in contact with the modified materials was studied, taking into consideration the unique electron structure of lanthanides assessed by goniometric measurement, also adhesion and spreading pressure were determined. Very low adhesion and polar SFE partly resulted in immediate bouncing of water droplet upon contact with the modified surface. The presented method allows preparing stable materials with a high potential in materials chemistry and modulation of surface features and engineering (e.g. heat transfer fluids, specific coating).
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