Porous liquid crystal elastomers for thermal-driven tunable acoustic properties
Achieving tunable acoustic properties is crucial for adaptive sound regulation in dynamically changing environments across engineering and biomedical applications. However, conventional porous materials possess fixed pore structures that result in static acoustic responses, while existing active systems often rely on complex, bulky, and multi-component assemblies that limit practical integration. Here, we present a porous liquid crystal elastomer (LCE) as a structurally simple yet highly reconfigurable material platform enabling wide-range acoustic tuning. By exploiting reversible, thermal-driven reconfiguration of its pore structure, the porous LCE achieves full-range modulation of sound absorption, transitioning from near-zero to near-perfect absorption at target frequencies, while enabling frequency-selective tuning through on-demand shifts of absorption peaks.