A porous, molecularly imprinted polymer and a process for its preparation are described. The propellant flow generates an oscillating pressure force in a resonance system which is then transmitted to a piezoelectric system. The radiation cured encapsulating material preferably has a tear resistance of less than about 2. The invention also relates to hair conditioning compositions. In accordance with another aspect of the invention, a method is provided for depositing a lithium alloy onto a substrate for producing a lithium alloy electrode, which exhibits enhanced surface diffusion of lithium.