Eco‐Friendly Centroidal Voronoi‐Tessellated Nanowire Networks for Efficient Ingress Protection and Broadband Acoustic Transparency

ABSTRACT Environmental water and dust ingress pose serious threats to human‐machine interaction (HMI) electronics, necessitating reliable protection from fibrous acoustic vents. However, most existing membranes in acoustic vents face inevitable trade‐offs between waterproofness and acoustic transmittance, while relying heavily on toxic solvents and fluoropolymers. Here, inspired by centroidal Voronoi tessellation (CVT), we use a unique green electro‐nanopatterning technique to develop eco‐friendly CVT nanowire network (EcoCVT‐net) acoustic membranes. Manipulation of a green ternary metastable solution system, and the rapid phase separation induced by non‐solvent seeds in the sprayed droplets of the Taylor cone, enable the assembly of 2D CVT‐nanostructured networks with deep‐subwavelength nanowires (diameter of 15 nm). Such membranes generate a nanoscale pore size of ∼190 nm, superhydrophobicity, and a low airflow resistivity of 7.6 × 10 6 Pa s m −2 , exhibiting both efficient water resistance (110 kPa) and broadband acoustic transparency with negligible sound transmission loss (<0.35 dB) across 63–20 000 Hz. Demonstrated in voice‐based artificial intelligence electronics, our acoustic vents deliver high‐fidelity voice transmission and long‐term IP68‐level protection for over 1000 h. This work provides a sustainable design pathway for fibrous acoustic metamaterials and should prove instrumental for the development of voice‐based HMI technologies.