Used as a coupling agent in sol-gel processes and surface modification of silica-based materials. Enhances adhesion between organic polymers and inorganic substrates, particularly in coatings, sealants, and composites. The amine group facilitates compatibility with resin systems, while the triethoxysilyl group hydrolyzes to form stable bonds with glass or metal oxides. Commonly applied in hybrid organic-inorganic coatings where durability, hydrophobicity, and chemical resistance are required. Also utilized in the synthesis of functionalized silica nanoparticles and porous materials for controlled release or catalysis.