Hyperspectral camouflage coating using Palygorskite to simulate water absorption of healthy green leaves.

In hyperspectral remote sensing detection, existing camouflage technology is far behind detection technology, causing a mortal threat to the survival of military targets on the battlefield. In this study, Palygorskite is selected as an innovative water absorption simulation material, combined with Cr 2 O 3 and polyurethane (PU) to form a camouflage coating simulating the reflectivity spectrum of green vegetation to counter hyperspectral imaging technology. Water absorption peaks reflectivity of purified Palygorskite reaches 55.4% and 39.1% under ultrasonic dispersion for 30 min in 3 wt% (NaPO 3) 6 , demonstrating good reflection characteristics. The best camouflage coating is obtained with 1 g Cr 2 O 3 , 5 g Palygorskite, and PU varnish by a coating method, demonstrating a good spectral similarity coefficient of 0.9124 and a cosine value of 0.9316. The excellent simulation effect is attributed to the synergistic effect of the Palygorskite crystal structure and spectral terms splitting of Cr3+ in Cr 2 O 3. The reflectivity spectrum of coating meets USA military specifications for an ultralightweight camouflage net system, demonstrating the great potential of Palygorskite in this field. [ABSTRACT FROM AUTHOR]