I purchased PEDOT:PSS (1.3% suspension in water) from Sigma-Aldrich. Currently, I am preparing a conductive hydrogel using PEDOT:PSS. In the paper the volume of PEDOT:PSS is mentioned as 0.01%, 0.03% and 0.05%. I need to mix these amounts in 40 ml DI water. What should be these amounts in ml? Do you have any idea?