Gas-Foaming Preparation of Fast Fading Porous Photochromic Hydrogels for Information Switching

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At present, inorganic photochromic hydrogels have aroused great interest among researchers and have shown great application prospects in the intelligent display field of optical information switching. However, long coloring and self-bleaching times have greatly limited their development. In this paper, the photochromic unit ammonium molybdate tetrahydrate (Mo) was embedded in a network of polyacrylamide. Pore creation via confinement of the decomposition gas from fixed sodium bicarbonate (SB) yielded a porous photochromic hydrogel. The porous hydrogel possessed macro-sized pores of 500–800 μm and exhibited rapid photoresponse and self-bleaching properties. The resulting porous hydrogel underwent a photochromic reaction after 40 s of UV light exposure. Simultaneously, the blue-green hydrogel returned to its initial color state within 1 h under natural conditions (indoors; temperature: 25 °C; light intensity: 22 W/m 2 ). This shows that the porous hydrogels have good reversibility. Compared with other photochromic hydrogels mixed with ammonium molybdate, the prepared porous hydrogels have good advantages. The as-prepared hydrogel exhibits excellent reversible repeatability, elasticity, and stable ultraviolet light response. In summary, its good stability and outstanding reversible repeatability make it a potential material for optical information switching, ink-free printing, information encryption, and rewritable systems.

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