A new approach to study electric-stimuli-response of rare-earth doped hydrogel

摘要

In this work, the rare-earth element is doped into GEL/P(AA/AM) hydrogels system based on chemical bonding. The stimuli-response, the deformation of rare-earth doped hydrogels responding to the application of direct current electric field, has been first studied using high speed camera system and microscope with digital speckle correlation method (DSCM). It was shown that the deformation displacement of rare-earth doped hydrogels increases with the increasing of electric field intensity and was more sensitive then that of non-doped hydrogels. The direction of generated deformation displacement of hydrogels doped with rare-earth was along the electric field direction, while in non-doped hydrogels, the direction of formation displacement was against the electric field direction. To improve the accuracy of the measurement, a bilinear interpolation of gray value was used to obtain the sub-pixel gray value. The experiment results have demonstrated clearly the feasibility and advantages of DSCM in measuring the deformation of rare-earth doped hydrogels, which is a new approach to test and investigate the mechanical behavior of the stimuli-response for these materials.