Anisotropic Biomass Microfluidics via Directed Moisture Transport and Enhanced Water‐Binding Capacity for High‐Yield Solar‐driven Atmospheric Water Harvesting

ABSTRACT Solar‐driven adsorption–desorption‐based atmospheric water harvesting (AD‐AWH) presents a promising strategy for sustainable freshwater production. However, conventional hygroscopic materials typically feature disordered internal architectures, severely hindering vapor diffusion and heat transfer. These structural limitations constrain adsorption kinetics and elevate the energy demand for desorption. Here, we report a biomass‐based hygroscopic aerogel (BHA) with vertically aligned microfluidic channels, fabricated via directional freeze‐drying. This anisotropic architecture enables directed vertical moisture transport combined with radial diffusion into secondary pores, effectively reducing vapor…

• NN
  National Natural Science Foundation of China

  Awards: W2412102, 52376063, 62501320
• CP
  China Postdoctoral Science Foundation

  Award: 2025M770595