Fig 2. Scanning Electron Microscope (SEM) images of different shapes and sizes of micro-grippers that are used in the experiments and the size comparison with daisy pollen grains.

A) 980 μm six-finger; B) 250 μm six-finger; C) 100 μm six-finger and D) 750 μm two-finger. E) SEM image showing the scalability of fabrication where a large number of micro-grippers could be simultaneously fabricated using conventional microfabrication techniques. Bright field microscopy images of thermoresponsive actuation of, a F) 980 μm six-finger, and a G) 750 μm two-finger micro-grippers; the grippers close as the temperature is increased from room temperature to 37°C, the physiological temperature. H) The side view of a two-finger gripper when closed. The scale bar in all the images is 100 μm.