PHA plays a key role in the superelasticity and flexibility of ACHAs, which can be summarized in three aspects.?

Second, PHA particles serve as pore-making to introduce a large number of pores into the cellular walls.

Aerogels usually serve as thermal insulator, but plenty of aerogels are hindered by fragility or plasticity.?

The structural superelasticity, parallel channels, and electrostatic nanofibers enable ACHA to be a biodegradable air filter material which can endure high flow rate without structural collapse.?

Even after 30 rounds of tests, the ACHA can still retains high PM removal efficiency (>90% for PM0.3 and PM2.5) and low pressure drop (~70 Pa), indicating excellent reusability and structural robustness.

?When passing through the channels, PM can be absorbed on cell walls due to the electrostatic interaction from oxygen-rich groups.

The anisotropic structures are able to accommodate both compressive and tensile deformations in a manner reminiscent of an accordion-like model .

The porous walls readily deform to dissipate the energy, so that the fracture or collapse of structure caused by local stress concentraiton can be avoided.

It is noteworthy that the recovery from compression has been extensively studied for many reported aerogels, while recovery speed after bending has scarcely been reported, which is probably due to the fact that bending-resilience is more difficult to achieve.

Oriented channels consolidates the whole architecture,?Porous walls of dehydrated cellulose derived from thermal etching not only reduce the rigidity and stickiness, but also guide the microscopic deformation and mitigate localized?large strain, preventing structural collapse.