Abstract
We report a kind of shear thickening fluid (STF) which exhibits non-iridescent structural colors (defined as colorful shear thickening fluid, c-STF). The color of the c-STF can be tuned in a whole visible light range via changing the particle size, the filling fraction and temperature. The color of this c-STF is characterized by reflection and transmission spectrum and the inner structure was observed via confocal microscope. The relationship between the structure transitions, color, and rheological properties are systematically investigate. The measurements show that the occurrence of photonic band gap is responded for the short-range geometric order. The semitransparent colorful STF create the possibility to observe the transition of inner structure in shear thickening (ST) phenomenon, which will attribute to further study the mechanism of ST. And the tuned colors also extend the potential applications such as full-color displays with a wide viewing angle and color-tunable soft armor.
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