['Several', 'reports', 'have', 'demonstrated', 'the', 'preparation', 'of', 'stable', 'particles', 'of', 'hydrophilic', 'and', 'water', '-', 'soluble', 'polymers', '[', '86–89', ']', ',', 'polyaniline', 'nanoparticles', '[', '90', ']', ',', 'and', 'organic', '–', 'inorganic', 'hybrid', 'particles', '[', '91–93', ']', '.']