“…The standard technical strategy involves employing specially designed stimulus-responsive polymers to solidify periodic structures within the droplets. Consequently, the variations in the structural color of these droplets can be harnessed for detecting parameters like temperature, pressure, pH, specific components in solutions (e.g., metal ions, proteins, DNA), and even volatile gases, among others [ 100 , 101 , 102 , 103 , 104 , 105 , 106 , 107 , 108 , 109 ]. Such applications necessitate the utilization of smart materials, such as polymers or surfactants, to accomplish the mentioned functions.…”