Direct Ink Writing of Cholesteric Liquid Crystal Elastomers: Mechanochromic and Angle-Dependent Structural Color
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초록
내용
Here, we present a new processing method to prepare cholesteric liquid crystal elastomer (CLCE) via UV-assisted direct ink writing (DIW). Interestingly, the helical axis of the DIW-processed CLCE film is slanted by about 40˚ along the printing direction, which resulted in either blue- or red-shifting of the reflected structural color of the CLCE film depending on the printing direction and the viewing angle. In addition, complex mechanochromic properties of the CLCE were further demonstrated that can be manipulated by the printing direction as well as the degree of stretching. The combination of chirooptical and mechanochromic properties of CLCE along with 3D printing method will pave the way to develop an interesting class of anti-counterfeiting materials and strain sensors.