“…The melting point of ILs is also related to ionic size, delocalization of charge, and H-bonds. [47][48][49] Deep eutectic solvents (DESs) are mixtures based on ILs that have a lower melting point than any of their individual components (e.g., choline chloride and urea). 50 Generally, DESs can alter the physicochemical properties of ILs, such as the melting point, density, viscosity, and surface tension.…”