Schematic (IMAGE) U.S. Army Research Laboratory Caption (a) Schematic of a soft actuator device (left) and exploded view of the device and constituent material layers (right). (b) Schematic of depositing (3D printing) hydrogel on the surface of a silicone layer after surface treatment and under UV light exposure. (c) Printing of the ionic hydrogel on the passive layer after surface treatment (left), final 3-D printed DEA (middle), and microstructure image of the device cross-section (right). Credit U.S. Army illustration Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.