Polar solvents such as isopropyl alcohol and DMF have been found to be more effective in exfoliating boron nitride layers than nonpolar solvents .
These solvents possess a similar surface energy to the surface energy of boron nitride nanosheets .
Polar solvents such as isopropyl alcohol and DMF have been found to be more effective in exfoliating boron nitride layers than nonpolar solvents because these solvents possess a similar surface energy to the surface energy of boron nitride nanosheets .