Inkjet printing of alternate layers of anionic and cationic polyelectrolytes allows organized gels to form
with structures similar to those made by layer-by-layer dipping methods but very much faster.
Structures of gels formed using slow and fast inkjet printing systems are compared using elemental
analysis, swelling and diffusion kinetics as characterization methods. After printing and washing, most
sodium or chloride counter-ions are lost from the gel, leaving only the polymer complex. The swelling
properties of the printed and washed gel depend on the deposition rate and on the ratio of the two
polymers as originally printed.