Reversible pH-responsive aggregates based on the self-assembly of functionalized POSS and hyaluronic acid.

We report here the self-assembly of reversible pH intelligent aggregate from natural polysaccharide hyaluronic acid and functionalized polyhedral oligomeric silsesquioxane with tertiary amines and hydroxyls (POSS-AH). Various forms such as micelles, sacs and membranes were self-assembled through different procedures in this organic/inorganic hybrid system. The complex can be manipulated simply by changing pH to produce hydrogen-bond and ionic interaction. Furthermore the aggregates can form at a wide pH range by adjusting the proportion of the two constituents. These pH-responsive composites will offer potential opportunities in many fields, including cell immune barriers, drug and gene delivery systems and chemical sensors.