Influencing Solvent Miscibility and Aqueous Stability of Aluminum Nanoparticles through Surface Functionalization with Acrylic Monomers

• Published in: ACS applied materials & interfaces Vol. 2; no. 9; pp. 2560 - 2569
• Main Authors: Crouse, Christopher A, Pierce, Christian J, Spowart, Jonathan E
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 22-09-2010
• Subjects: Acrylic Resins - chemistry; Aluminum - chemistry; Colloids - chemistry; Materials Testing; Nanoparticles - chemistry; Nanoparticles - ultrastructure; Solvents - chemistry; Surface Properties; Water - chemistry; functionalization; composites; oxidation; nanoparticles; monomer; Aluminum
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/am100402z

With growing interest in the development of new composite systems for a variety of applications that require easily processable materials and adequate structural properties with high energy densities, we have pursued the chemical functionalization of oxide-passivated aluminum nanoparticles (nAl) using three acrylic monomers, 3-methacryloxypropyltrimethoxysilane (MPS), 2-carboxyethyl acrylate (CEA), and phosphonic acid 2-hydroxyethyl methacrylate ester (PAM), to provide chemical compatibility within various solvent and polymeric systems. Fourier transform infrared and X-ray photoelectron spectroscopy suggest that attachment of MPS and PAM monomers occurs through the formation of bonds directly to the passivated oxide surface upon reaction with surface hydroxyls, whereas CEA monomers interact through the formation of ionic carboxylate binding to aluminum atoms within the oxide. The coated particles demonstrate enhanced miscibility in common organic solvents and monomers; MPS and PAM coatings are additionally shown to inhibit oxidation of the aluminum particles when exposed to aqueous environments at room temperature, and PAM coatings are stable at even elevated temperatures.