Atmospheric water harvesting composite foams, and systems and methods for fabrication and use thereof

A method comprising:

• immersing at least part of a foam in a solution comprising a plurality of deliquescent particles, the plurality of deliquescent particles being formed of one or more hygroscopic materials, the foam comprising an organic polymer and having a pore size of at least 1 μm;
• and
• after the immersing, drying the foam to form an atmospheric water harvesting (AWH) composite,
• wherein, after the drying, the plurality of deliquescent particles are disposed on internal surfaces of the foam.

A method comprising:

• providing an atmospheric water harvesting (AWH) composite in an atmosphere having a relative humidity, such that water in the atmosphere is captured by the AWH composite;
• and
• after the providing, releasing the captured water from the AWH composite by heating the AWH composite,
• wherein the AWH composite comprises a foam and plurality of deliquescent particles,
• the foam comprises an organic polymer and has a pore size of at least 1 μm, and
• the plurality of deliquescent particles is disposed on internal surfaces of the foam and is formed of one or more hygroscopic materials.