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    Plasma deposition of long-lasting hydrophilic coatings on alumina microparticles

    Year: 2019

    Journal: Thin Solid Films, Volume 686, SEP 30

    Authors: Sardella, Eloisa; Trulli, Marta Garzia; Palumbo, Fabio; Cosmai, Savino; Gristina, Roberto; Armenise, Vincenza; Favia, Pietro

    Organizations: SISTEMA [MIUR, Italy] - Italian Ministry of Education, University and ResearchMinistry of Education, Universities and Research (MIUR) [PONa3_00369]; LIPP [Laboratorio Pubblico di Ricerca Industriale Pugliese dei Plasmi, Rete di Laboratorio, Apulian Region, ITALY] - Italian Ministry of Education, University and Research [51]

    Country: Strasbourg, FRANCE

    Keywords: Plasma polymerization; Organic coatings; Carboxylic groups; Aging; Alumina microspheres; Mesoporous materials; Surface modification; Hydrophilic coatings

    The research of versatile, simple and inexpensive approaches for chemically decorating micro-nanomaterials is a challenge in the field of functional surfaces in general, and in particular in plasma processing. Decorating ceramic particles with oxygen containing (O-containing) functionalities can render such materials very suitable as catalyst supports and adsorbents, or for manufacturing membranes and sensors. This paper describes a material processing consisting of a plasma-deposition step with CO2/C2H4 mixtures followed, or not, by a plasmagrafting step in CO2/H-2 blends. In this way, alumina mesoporous microparticles have been functionalized with coatings decorated with carboxylic groups (COOH surface density up to 3.3 +/- 0.6x10(-9) mol/cm(2)) stable up to 1 month both in air and in water. A home-made rotating radiofrequency (RF, 13.56 MHz) driven plasma reactor has been used, whose gentle agitation allows homogeneous coating of the particles. The low environmental impact, the safety of the reagents used, together with the effective coating of the particles, render the proposed approach highly competitive with respect to conventional functionalization processes based on wet chemistry.
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