Self-Immobilization of reactive molecules and nanoparticles in two-dimensional organic networks

Two-dimensional organic and organic/inorganic networks containing functiona l groups or nanoparticles were formed using Langmuir monolayer technique. K inetics of chemical transformations in monolayers of epoxy oligomer on the surface of aqueous solutions of oligoamine or 12-phosphotungstic acid were studied. Using combination of film balance, FTIR spectroscopy and sol-gel t echniques, we found that molecules of oligoamine and heteropolyacid are imm obilized in network of epoxy polymer. Nanoparticles of polyacid introduced in the epoxy matrix can not be withdraw from the monolayer neither by neutr alization of subphase leading to decomposition of polyanions, nor by extrac tion of polyanions with strong solvents. The compositions of 2D networks of epoxy polymers with each reactive agent were evaluated. Such systems with enhanced stability can serve as a matrix for immobilization of molecules an d nanoparticles with the desired chemical, physical, and biological behavio r. (C) 1999 Elsevier Science S.A. All rights reserved.