Ultrasound can be categorized as low frequency (20 to 100 kHz), middle frequency (100 kHz to 1 MHz), and high frequency (above 1 MHz) (1 to 10 MHz) . Acoustic cavitation, the emergence and dissolution of bubbles created in a solution during sonication, results in extremely high local temperatures and pressures (greater than 1000 K.s 1 ), as well as rapid heating and cooling rates, which are necessary to create crystallites . In 30 minutes, the SCL technique using 1-methyl-2-pyrrolidone (NMP) as the solvent produced outstanding MOF-5 nanocrystals with sizes ranging from 5 to 25 lm . After thorough analysis and comparison, it was discovered that the sample's physical characteristics were almost identical to those of a regularly generated sample. After 5 min of reaction time, HKUST-1 formed nanocrystalline powder (10 to 40 nm) using a DMF/EtOH/H2O mixed solution, and longer reaction times produced crystals with greater sizes (50 to 200 nm) and higher yields. However, the product only partially disintegrated as a result of the ongoing reaction .