Transpiration‐Driven Bionic Leaves With Conical Pores for Hyperspectral and Thermal Camouflage

Camouflage materials that replicate leaf spectral signatures and surface temperature are urgently needed to counter hyperspectral and thermal infrared detection. However, current materials display slow moisture‐exchange kinetics due to poor transpiration mimicry, causing hyperspectral and thermal infrared exposure. Herein, transpiration‐driven bionic leaves based on conical‐pore hydrogels are pioneered via acid‐induced phase separation to accurately replicate spectral and thermal signatures of natural leaves. The constructed conical pores facilitate Laplace‐pressure‐driven directional liquid movement within the tapered pores and enhance water loading and mass transfer. Combined with hygroscopic salts and hydrophilic groups, the system achieves rapid moisture response and sustained water supply under fluctuating conditions. This transpiration‐mimicking water regulation allows the bionic leaf to match natural leaves in spectral and thermal performance. The bionic leaf achieves spectral correlation coefficients of 0.983 in the visible‐near‐infrared band and 0.997 in the thermal infrared band, verifying outstanding dual‐band camouflage performance. Moreover, the bionic and natural leaves display closely consistent emissive features and radiation temperatures, with deviations less than 0.007 and 0.98°C, respectively, to deliver effective thermal infrared concealment. This work establishes a general strategy for constructing bionic materials based on Laplace‐pressure‐driven water regulation, unlocking new opportunities for the design of advanced camouflage systems.