Fig. 6.
Additional properties and potential applications of the Bio-RC film. (A) Photograph of a hydrophobic Bio-RC film sustaining dyed spherical water drops. (B) Comparison of CAs between a flat film and the Bio-RC film with the same components. (C) Stress–strain curve of the Bio-RC film. Insets show that the film remained intact and remarkable mechanical damage was not observed through hundreds of twists and stretches. (D) Photograph of an umbrella made of Al2O3–PDMS hybrid films, suitable for both sunny and rainy days. (E) Demonstration of the potential application of the film in wearable devices. (F) Mobile phone covered with the film tailored for its shape and size for cooling purposes. (G) Temperature tracking for a bare phone and the phone covered with the film, running the same application under the same environmental conditions. (H and I) Digital picture and corresponding temperature variation of a piece of paper and the Bio-RC film with the similar size and thickness on the surface of a car hood.