Fig. 4: Areal strain, and mass ratio control for IR ink, and encoding/decoding, respectively. | Nature Communications

Fig. 4: Areal strain, and mass ratio control for IR ink, and encoding/decoding, respectively.

From: Chameleon-inspired tunable multi-layered infrared-modulating system via stretchable liquid metal microdroplets in elastomer film

Fig. 4

a Concept of changing the IR ink color when applying different areal strains (0%, 137%, 525%, and 1011%). The scale bar is 0.25 cm for IR images. b The optical image of the as-prepared “flower” pattern and IR images of the “flower” pattern placed on the hot plate under different temperatures. The scale bar is 1 cm for IR images. c Total reflectance spectra of the bottom layer of BLEE film with mass ratio of 1:10 before or after applying areal strain (green range represents the wavelength from 7.5 μm to 14 μm). d Concept of IR camera as a key to open the lock (decoding) and switch between visible light mode and IR mode. e The optical images of number pattern before and after applying areal strain. f IR images of the presentation of hidden numbers after applying a specific areal strain. The scale bar is 0.5 cm for IR images.

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