Method for preparation of planar alginate hydrogels by external gelling using an aerosol of gelling solution

► Planar alginate hydrogels prepared by external gelling method. ► Controlled and slow exposure of alginate solution to aerosol of gelling solution. ► Dimensional stability and Young's modulus as a function of gelling conditions. ► Calcium ions after gelling by aerosol reach the maximum binding capacity. ► Principles of classical gelling mechanism of alginates apply for this method.