Macro Smart Device Movement By Supra-Amphiphiles Strategy

Supra-amphiphiles refer to amphiphiles that are fabricated by using noncovalent interactions or dynamic covalent bonds,and have broad application prospects such as controlled release of drugs,intelligent nanocarriers,and chemical analysis.For a long time,the research scope of supra-amphiphiles has mainly focused on the molecular structure and the functional of microscopic aggregates.Through a variety of stimuli responsive control methods,many smart material systems with dynamic transformation properties have been developed.However,the current smart material system gradually showed the development trend from micro-molecules to macro-materials.Therefore,whether the design of micro-molecular structure can guide the change of macro-material properties has become an urgent problem.So,this paper takes the self-driven device based on Marangoni effect as the research model.In the process of self-driven movement,we solved the problem of rapid saturation of surfactant molecules at the interface,by using two supra-amphiphiles strategies of " modulate amphiphilic" and "create amphiphilic".At the same time,the strategy is also applied to macro-supramolecular assembly and hydrophobic molecule solubilization.The main work contents are as follows:(1)We designed and prepared a macro-smart device based on the Marangoni effect.By introducing host-guest recognition supra-molecules into the solution to regulate the amphiphilic of surfactants,the movement time of smart devices can be extended by more than 20 times.Then,the supramolecular self-assembly process applied to the macro-structured primitives achieved efficient and accurate assembly.(2)We designed and synthesized supra-amphiphilic molecules linked by Schiff base dynamic covalent bonds,and developed a "create amphiphilic" strategy,which enables supra-amphiphiles to decompose at low pH.It uses its adsorption and decomposition dynamic balance at the gas-liquid interface to maintain the surface tension gradient and achieve long-term movement of smart devices.Then it is used to solubilize hydrophobic molecules.