Micellar Self-Assembly Constructed Microparticulate Shells Enable Dual-Responsive Release of Pesticide Microcapsules...

Existing polyurea membranes are continuous and dense. They are used to encapsulate pesticides to prevent the premature release of active ingredients. However, this also results in the inability of the active ingredients to be released on demand. We report a strategy in which amphiphilic molecules take turns "on duty". First, micelles are used to transport water to form a microparticle layer, and then a thin dense coating is formed on its surface. Eventually, a bionic interfacial membrane with a structure similar to that of the leaf epidermis or animal skin is obtained. Experiments in conjunction with molecular simulations verified the underlying membrane formation mechanism. As a microcapsule shell for encapsulating pesticides, this bionic membrane can accurately respond to the digestive and crawling behaviors of pests, thus enabling the on-demand release of insecticides. Additionally, this membrane has the potential to be used in the preparation of flat membranes for sewage treatment.