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A test‐paper‐like photonic crystal (PC) viscometer is fabricated based on the positive correlation between viscosity and the infiltration time for viscous liquid to entirely soak the PC film. It can be broadly used in different occasions to quickly determine the viscosity for many liquids, considering its portable and disposable characteristics and the requirement of little samples.
In article number 1603351, J. P. Ge and co‐workers demonstrate a portable and disposable photonic crystal based “test paper” for convenient monitoring of viscosity for many liquids with the requirement of little samples. The viscometer measures the viscosity according to the infiltration time of viscous liquid, which can be acquired by spectrometer measurement or naked‐eye observation due to the change...
A reversible color change of a polyaniline‐infiltrated TiO2 inverse opal photonic crystal (PC) film can be obtained when the PC is switched from an acidic to alkali vapor environment. In a saturated NH3 environment, the stopband of the as‐prepared PCs changes from 556 to 688 nm; such large shift of 132 nm could be observed, corresponding to a clear color change from green to red. After placing in...
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