Solidifying water into an ultra-lightweight, structurally stable hydrogel using a PNIPAM matrix embedded with hollow foaming microspheres

https://www.eurekalert.org/news-releases/1120711

"overcomes water coolant's weight/ fluidity in portable/ structural applications... density as low as 0.041 g/cm³; 25X lighter than water, still maintaining >52% water content... hollow microspheres create sealed air pockets blocking heat conduction/ retained water provides evaporative cooling and high IR emissivity... at 80°C maintains >50°C temperature difference across its thickness... 100X better compressive strength (shape recovers)... aerospace, portable electronics, wearables, less need for air conditioning"