Simultaneous multiple-point adsorption of aluminum ions and charged molecules a polyampholyte thermosensitive gel: Controlling frustrations in a heteropolymer gel

We report the data on-concurrent multiple point adsorption of two oppositel y charged species of "target molecules" (aluminum ions and 1,3,6,8-pyrenete trasulfonic sodium salt' (Py-4)) by a polyampholyte gel of N-isopropylacryl amide (NIPA, 6 M) with methacrylic acid (MAA, 80 mM) and methacrylamidoprop yl trimethylammonium chloride(MAPTAC, 80 mM). The goal of this study is to test the mutual frustrations created by adsorption of one species on the ad sorption of the other. Understanding these frustrations is an important ste p toward elucidating the memory of conformations in heteropolymer systems. We found that in the absence of aluminum, the adsorption of Py-4 was suppre ssed by gel collapse, presumably because of an increase in MAA/MAPTAC ionic pairs that prevents the formation of potential adsorbing centers. Adding a moderate amount of aluminum significantly enhances adsorption of Py-4 by t he collapsed gel, indicating that aluminum ions compete for bonds with MAA and help release vacant MAPTAC centers. Finally, with further increase of a luminum, the Py-4 multiple point adsorption is again suppressed; pointing o ut the frustrations created by aluminum-mediated effective cross-links. We analyze also the cooperativity of the adsorption process.