Designing High-Damping, Optically Clear Ionogels through Competitive Binding for Flexible and Impact-Resistant Applications.

Developing damping materials that are both optically transparent and mechanically robust, while offering broad frequency damping capacity, is a significant challenge─particularly for devices that require protection without compromising visual clarity. Conventional methods often either fail to maintain transparency or involve complex designs that are difficult to implement. Here, we present an ionogel system that integrates a physically cross-linked elastic copolymer network with a viscous ionic liquid. The competitive interactions between the ionic liquid and the polymer network enable fine-tuning of the mechanical stability and damping capacity. The resulting ionogel is transparent and mechanically robust and exhibits excellent damping over a wide frequency range. Remarkably, a thin layer (0.15 mm) absorbs nearly 60% of the impact force and retains its performance after exposure to extreme conditions. This approach offers a straightforward method for designing advanced damping materials that meet both the aesthetic and functional demands of modern technologies.