Journal
CHEMICAL ENGINEERING JOURNAL
Volume 429, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.132342
Keywords
Sensitive mechanochromic photonic crystals; Broad tuning range; Fast responsive speed; High-resolution; Display
Categories
Funding
- NSFZJ for Distinguished Young Scholars [LR16B010002]
- National Natural Science Foundation of China [21673160, 51920105004, 11574058]
- General Program of the Natural Science Foundation of Guangdong Province [2019A1515011563]
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Extremely sensitive MPCs film with outstanding optical performances was fabricated through the self-assembly of silica particles into DEGEEA and fixing the ordered structures by photopolymerization. The strong electrostatic repulsion between the particles was experimentally proved to be the key for the self-assembly. Compared with conventional MPCs, the as-fabricated MPCs exhibit significant improvements in optical performances.
Mechanochromic photonic crystals (MPCs) that can change their colors under pressures are highly desired. However, the poor sensitivity of MPCs (including the limited tuning range of photonic bandgap and responsive speed) and stability restrict their practical applications. Here, extremely sensitive MPCs film with outstanding optical performances was fabricated through the self-assembly of the silica particles into di(ethylene glycol) ethyl ether acrylate (DEGEEA) and fixing the ordered structures by photopolymerization. The strong electrostatic repulsion between the particles was experimentally proved to be the key for the self-assembly of silica particles in nonpolar DEGEEA, ruling out the solvation force as the driving force. Compared with the conventional MPCs, the as-fabricated MPCs exhibit significant improvements in optical performances, including broad tuning range of photonic bandgap (362 nm), high sensitivity (7.55 nm/kPa), fast responsive speed (7.0 nm/ms), long-lasting usability (>2 months), wide working temperature range (-20 to100 celcius) and excellent reversibility (>1000 times) in cycling test. Based on these characteristics, the MPCs can be used for display applications with highresolution (up to 5.0-mu m resolution) and full colors. This work provides new insight for the self-assembly of colloids and will extend the applications of MPCs in sensitive sensors, multicolor displays, and smart windows.
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