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Please update the section #Research. I tried adding a study featured in 2022 in science but it was reverted and arguably rightly so e.g. as other necessary content is missing there (before this would be due) or because it should have been added using more refs (some of which you can find below).
One field that is notable and missing is the use of hydrogels in sustainable energy and atmospheric water generators. Please see the paragraph about both of these in combination at Atmospheric water generator#Power:
The minimum energy for atmospheric water harvesting [1]
Unless the air is super-saturated with vapor, an energy input is required to harvest water from the atmosphere. The energy required is a strong function of the humidity and temperature. It can be calculated using Gibbs free energy.
Potable water can be generated by rooftop solar hydropanels using solar power and solar heat.[2][3][4]
Hydrogels can be used to capture moisture (e.g. at night in a desert) to cool solar panels[5] or to produce fresh water[6][7] – including for irrigating crops as demonstrated in solar panel integrated systems where these have been enclosed next to[8][9] or beneath the panels within the system.[10][11][12][13][14][15]
^Rao, Akshay K.; Fix, Andrew J.; Yang, Yun Chi; Warsinger, David M. (2022). "Thermodynamic limits of atmospheric water harvesting". Energy & Environmental Science. 15 (10). Royal Society of Chemistry (RSC): 4025–4037. doi:10.1039/d2ee01071b. ISSN1754-5692. S2CID252252878.
^Guo, Youhong; Bae, Jiwoong; Fang, Zhiwei; Li, Panpan; Zhao, Fei; Yu, Guihua (12 August 2020). "Hydrogels and Hydrogel-Derived Materials for Energy and Water Sustainability". Chemical Reviews. 120 (15): 7642–7707. doi:10.1021/acs.chemrev.0c00345. ISSN0009-2665.