Charge quantity as a sole factor quantitatively governing curvature of Selemion

It was reported previously that the curvature of largely dehydrated silver-plated Selemion had a quantitatively direct correlation to the charge given to it, as long as the redox reaction of silver layers was induced. It was interpreted such that the control of charge quantity given to Selemion led to the precise control of its bending curvature, which was a quite preferable characteristic for the actuator. On the other hand, it was found previously that the curvature of Selemion was largely influenced by the environmental humidity. Therefore, such a quantitative correlation between the charge quantity and curvature might change once the environmental humidity changes. This paper discusses the limits of validity of this correlation. We derived a conclusion that the Selemion curvature was solely governed by the charge quantity, despite the occurrence of significant alteration of Selemion's electric property in accordance with environmental humidity change. Based on this conclusion, we further proposed a mathematical model which related the charge quantity with the Selemion bending curvature.