Fig. 2: Preparation and wettability regulation of iron oxide magnetic agent. | Nature Communications

Fig. 2: Preparation and wettability regulation of iron oxide magnetic agent.

From: Reactive wetting enabled anchoring of non-wettable iron oxide in liquid metal for miniature soft robot

Fig. 2: Preparation and wettability regulation of iron oxide magnetic agent.

A Schematic of the preparation process of Fe3O4@PDA@Ag (FPA) particles. B Transmission electron microscope (TEM) images of the core-shell structured FPA (5 mM) nanoparticle and the corresponding element mappings. Each experiment was repeated independently for 3 times with similar results. C Fourier-transform infrared (FT-IR) spectroscopy of Fe3O4 and Fe3O4@PDA. The yellow region indicated the common peaks for two kinds of particles, while the light blue region suggested the characterization peaks that only Fe3O4@PDA possessed. D X-ray diffraction (XRD) patterns of Fe3O4, Fe3O4@PDA, and FPA (5 mM). E Snap images and illustrations of the EGaIn droplet extension and contraction on the FPA (80 mM) membrane showing the wettability transition triggered by the alloying reaction between Ag and EGaIn. F Variation of contact angle as a function of time during the wettability tests on Fe3O4@PDA, FPA (5 mM), FPA (15 mM), and FPA (80 mM) membranes, where the whole dynamic process is divided into five stages. Source data are provided as a Source Data file.

Back to article page