Figure |Two-Photon Polymerization of Shape Memory Microstructures Using a Green Laser Beam (IMAGE)
Caption
a, An illustrative image for a typical three-dimensional direct laser writing process. A femoto second later was tightly focused into a photosensitive material (hydrogel in our case). b, Fabrication result of 3D woodpile microstructure. The woodpile structure was imaged under reflective mode in a Nikon confocal microscope, and the 3D feature and the sub-micrometer resolution was clearly demonstrated. c, Fabrication and characterization of a microstructure with water-responsive shape memory effect. When the microenvironment is filled with water, the microstructure will swell into octagons due to its mechanical property. When the water content in the environment drops (evaporates), the octagons will shrink into squares. Due to the robustness of the material, this shape memory effect process can be reversed for several times at micrometer scale.
Credit
by Haoyi Yu, Haibo Ding, Qiming Zhang, Zhongze Gu, and Min Gu
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