Fig. 3. (a) Pictures of gel particle suspensions. The suspensions have different viscosities and colors depending on the particle concentration. Reproduced with permission.70 Copyright 2009, American Chemical Society. (b) Schematic of assembling soft cohesive particles into colored microspheres, and the photographs and SEM images of the obtained colored microspheres. Reproduced with permission.73 Copyright 2014, Wiley-VCH. (c) Schematic of the spraying method used for amorphous structural color and different colors obtained that are tuned by the particle size. Reproduced with permission.74 Copyright 2017, Royal Society of Chemistry. (d) Schematic of assembling oppositely charged particles in a layer-by-layer manner and the obtained colored films. Reproduced with permission.75 Copyright 2018, John Wiley and Sons.
