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The temperature-driven color changes of five thermochromic photonic gels whose ACMO contents were 0, 15, 25, 35, and 50 mol %, respectively. Five photonic gels were templated by the same opal arrays on a single substrate. The time interval for each temperature was 30 min. As the ACMO content increased in the gel, the reflective colors tended to red-shift at a given temperature due to the more swollen state of the gel.
