Reconfiguring Alginate-Based Supra-amphiphiles via Redox-Responsive Pickering Emulsions for Enhancing Pesticide Droplet Retention

In view of the micro/nanostructure tunability of colloid particles, they acted as agrichemical delivery systems. Herein, supra-amphiphilic colloids were fabricated using a host-guest interfacial recognition-architected emulsion template strategy and controlled their agricultural interfacial interactions with the superhydrophobic target surface. Interestingly, the supramolecular interfacial system possessed redox-stimulated molecular reconfigurability by regulating aggregation/disaggregation behaviors. Therefore, the surface roughness of silver willow-like supramolecular colloids was readily modulated by tuning the micro/nanointerfaces of the emulsion template, which exhibited a topology and pliability that allowed them to adapt to the micro/nanostructures of leaf surfaces. It simultaneously solved comprehensive problems of adhesion, bounding, and rainwashing of pesticide droplets by the multiscale coupling effect. Intriguingly, the pesticide retention dominantly depended on the degree of surface roughness of silver willow-like supramolecular colloids, and the most roughened one showed greatest in vitro antifungal efficiency against Botrytis cinerea, reaching 91.8% even through multiple rainwashing. Results disclosed that the supra-amphiphilic colloids addressed the entire application processes for promoting the development of sustainable agricultural science.