Fig. 2: Total reflectance-based IR camouflage performance, reflectance spectra, and mechanical properties of BLEE films. | Nature Communications

Fig. 2: Total reflectance-based IR camouflage performance, reflectance spectra, and mechanical properties of BLEE films.

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

Fig. 2

a Schematic illustration of experimental observation of IR camouflage, where samples are placed on the hot plate and IR camera is used to take pictures. b IR images of BLEE films with specific mass ratio of Ecoflex/EGaIn (1:0, 1:2, 1:4, 1:6, 1:8, or 1:10) after applying various areal strains of 0%, 137%, 525%, 1011% and 1500%, respectively. c The temperature curves taken from the IR images of BLEE films in Fig. 2b. All error bars represent the standard deviation. d The total reflectance spectra of BLEE film with mass ratio of 1:10, after applying different areal strains (0%, 137%, 525%, 1011%, and 1500%). e The calculated average reflectances ranging from 7.5 μm to 14 μm. f Comparison of apparent temperatures of BLEE films with different mass ratios read from measured IR images (lines) and the calculated apparent temperatures from measured total reflectance spectra (dots). All error bars represent the standard deviation. g The measured stress-strain curves of pure Ecoflex and BLEE films with different mass ratios of Ecoflex/EGaIn (1:2, 1:4, 1:6, 1:8, and 1:10) in the range of strain from 0% to 400%. h The average reflectances calculated from total reflectance spectra and measured apparent temperatures of BLEE film with mass ratio of 1:10 placed on the hot plate (76 °C) after different cycles (0, 5, 100, 200, 400, 1000, and 2000). All error bars represent the standard deviation. i The IR and visible optical photos of stretched BLEE film with mass ratio of 1:10 wrapped human hand to show IR camouflage effect.

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