Intelligent Magnetically Reconfigurable Biomass Liquid Crystal Films with a Solid‐Shell/Fluid‐Core Anisotropic Architecture for Programmable Microwave Absorption

ABSTRACT The rapid advancement of intelligent electronics and radar technologies has created an urgent demand for stimuli‐responsive microwave absorbers with dynamically tunable electromagnetic properties. However, most high‐performance absorbers remain fixed in their electromagnetic properties after fabrication, limiting adaptability to varying electromagnetic environments. Here, a magnetically reconfigurable Ni@CNT—cellulose liquid crystal film (NCCF) is constructed with a solid‐shell/fluid‐core architecture based on renewable hydroxypropyl cellulose (HPC). The fluid cholesteric core endows Ni@CNT chains (NCC) with rotational freedom, while the solidified shell preserves mechanical robustness. Under magnetic fields, NCC rotation induces concurrent reorganization of the surrounding HPC matrix through interfacial hydrogen bonding, yielding a multiscale anisotropic framework. The films feature pronounced orientation‐dependent microwave absorption (MA), where magnetic‐field‐induced structural reconfiguration reorganize conductive pathways, dipolar interfaces, and magnetic coupling domains, enabling programmable modulation of Reflection loss (RL min ) and effective absorption bandwidth (EAB). This tunability follows a clear performance trend (NCCF‐H > NCCF‐R > NCCF‐V > NCPF), corresponding to progressively strengthened anisotropic dissipation networks. Consequently, the horizontally aligned NCCF exhibits the strongest attenuation (RL min = −42 dB at 12 GHz) with X−Ku‐band‐wide absorption. This work provides a sustainable and scalable strategy for constructing next‐generation adaptive electromagnetic absorbers by integrating renewable cellulose liquid crystals with magnetically responsive nanochains.