Deposition of aminosilane coatings on porous Al₂O₃ microspheres by means of dielectric barrier discharges

Abstract

Advances in the synthesis of porous microspheres and in their functionalization are increasing the interest in applications of alumina. This paper deals with coatings plasma deposited from 3‐aminopropyltriethoxysilane by means of dielectric barrier discharges on alumina porous microspheres, shaped by a vibrational droplet coagulation technique. Aims of the work are the functionalization of the particles with active amino groups, as well as the evaluation of their surface coverage and of the penetration of the coatings into their pores. A multi‐diagnostic approach was used for the chemical/morphological characterization of the particles. It was found that 5 min exposure to plasma discharges promotes the deposition of homogeneous coatings onto the microspheres and within their pores, down to 1 μm.

Recent Advancements in the Use of Aerosol-Assisted Atmospheric Pressure Plasma Deposition

“…M. Garzia Trulli et al deposited 3-aminopropyltriethoxysilane-based coatings onto porous alumina microparticles [93]. The latter were placed on a 3-µm-thick PVDF membrane foil on the bottom ground electrode, in a parallel-plate DBD system, equipped with a vacuum system to hold the powders in place during the plasma treatments and avoiding their removal.…”