Fig. 4From: Supercooling of Water Controlled by Nanoparticles and UltrasoundCombined effect of ultrasound and nanoparticles on the supercooling degree of water [a Al2O3 nanoparticles, b SiO2 nanoparticles]. ΔTN-U/ΔTW represents the ratio of supercooling degree required for the water solidification with nanoparticles and ultrasound to that without nanoparticles and ultrasoundBack to article page