High-Resolution Erasable Live Patterns Based on Controllable Ink Diffusion on the 3D Blue-Phase Liquid Crystal Networks

Colorful blue phase liquid crystal (BPLC) patterns have attracted wide research attention owing to their intriguing and advantageous properties and promising applications. However, it remains a challenge to develop novel and high-resolution patterns from BPLC owing to the complicated synthetic procedure for the functional molecules. This study reports a high-resolution live pattern by well-designed diffusion of 5CB ink on the wettability-modified BPLC networks. Interestingly, the shape and color of the as-prepared pattern change with time, which results in unique spectra change of the printed pattern, first red-shift and subsequent blue-shift of the stopband position and continuous growth in reflectivity intensity with time. The hydrophobic substrate greatly suppresses the random spreading and diffusion of ink, contributing to high-resolution patterns. The promising applications of live patterns for program display and active labels are demonstrated. Various high-resolution erasable colorful patterns are obtained. The structure reconfiguration of the writing and erasing processes is proved by transmitted electronic microscope images and Kossel diffraction diagrams, which ensures the reversible writing/erasing of the pattern on the membrane. This work is of significance for the development of novel rewritable paper and high-quality optic devices based on BPLC materials.

Automated summary

This study reports a high-resolution live pattern created by diffusion of ink on modified BPLC networks. The shape and color of the pattern change with time, resulting in unique spectrum changes. The hydrophobic substrate suppresses ink diffusion, enabling high-resolution patterns. The research is significant for the development of novel rewritable paper and high-quality optic devices based on BPLC materials.