Figure 7
From: Prediction of coating thickness for polyelectrolyte multilayers via machine learning

Film thickness determination by QCM-D. (A) Polyelectrolytes (chitosan, CHI, and hyaluronic acid, HA) are deposited on the crystal, where they form a multilayer film. (B) Growth of the film is followed by the measurements of the frequency and the dissipation variations with respect to the crystal in contact with the buffer solution only. As an example, the figure shows the measurements corresponding to the third overtone. (C) Film growth depending on polyanion.