Fig. 10. (a) Color and reflection spectral changes of information hidden in MSN structural colored patterns and multicolor MSN structural colored patterns in N2 and saturated EtOH vapor atmospheres. Each reflection spectrum was marked by colors of the corresponding patterns in the panels. Reproduced with permission.136 Copyright 2014, American Chemical Society. (b) Reflectance spectra of blue and red films responding to a change in the humidity level. Reproduced with permission.137 Copyright 2016, American Chemical Society. (c) Optical image after blowing onto it and the model of liquid propagation on the hydrophobic surface of the hollow SiO2 PCSs. Reproduced with permission.138 Copyright 2018, John Wiley and Sons.
