Supramolecular Assembly And Disassembly Based On Electrostatic Interation

Electrostatic force is an important driving force in the process of supramolecular assembly with a simple principle, a wide range of applications and other characteristics, through the electrostatic force can be simple and fast to achieve supramolecular assembly and form the supramolecular aggregates.When the blocks’ scale is in micron level, the study of macroscopic supramolecular assembly by electrostatic force is still at the initial stage. For the non-hydrogel system of the millimeter scale blocks, the increase of surface roughness reduces the freedom degree of the surface functional groups, so it is difficult to realize macroscopic supramolecular assembly. At present, it has been reported that the millimeter scale hydrogel assembly system based on electrostatic force has only achieved its assembly process and has not promoted the assembly system to practical application.First PDMS building blocks were prepared by template method, a stable flexible spacing coating were prepared on the surface of PDMS by Layer-by-Layer technique and glutaraldehyde crosslinking. Then the PDDA/PAA polyelectrolyte multilayer films were prepared with Layer-by-Layer technique. Finally the PDMS blocks assembled by electrostatic interaction between polycation PDDA and polyanionic PAA under the condition of shaking, and we can control its disassembly proces by adding strong electrolyte NaCl solution.In order to realize the functional response of the macroscopic supramolecular assembly system under the electrostatic interaction, we introduced the prepared gold nanosheets into the poly (N-isopropylacrylamide)(PNIPAM) hydrogel basis material with temperature responsiveness. The macroscopic supramolecular were assembled by electrostatic force between two kinds of basis materials, the dual stimulus responsiveness of photothermal and thermo assembly systemby electrostatic force was also realized. In order to enable the prepared assembly system to achieve responsive movement, we prepared the micrometer scale hydrogel with by photolithography and embossing technology, then completed the assembly and disassembly process.We have extended the research scope and potential application field of the electrostatic force supermolecule assembly system.