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Lee H, Gu M, Hwang J, Hwang H, Kim Y, Lee SY, Kim S. Auxetic Photonic Patterns with Ultrasensitive Mechanochromism. Adv Sci (Weinh) 2024; 11:e2304022. [PMID: 37942590 PMCID: PMC10767460 DOI: 10.1002/advs.202304022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 09/11/2023] [Indexed: 11/10/2023]
Abstract
Photonic crystals with mechanochromic properties are currently under intensive study to provide intuitive colorimetric detection of strains for various applications. However, the sensitivity of color change to strain is intrinsically limited, as the degree of deformation determines the wavelength shift. To overcome this limitation, auxetic photonic patterns that exhibit ultra-sensitive mechanochromism are designed. These patterns have a regular arrangement of cuts that expand to accommodate the strain, while the skeletal framework undergoes torsional deformation. Elastic photonic crystals composed of a non-close-packed array of colloidal particles are embedded in the cut area of the auxetic patterns. As the cut area amplifies the strains, the elastic photonic crystals show significant color change even for small total strains. The degree of local-strain amplification, or sensitivity of color change, is controllable by adjusting the width of cuts in the auxetic framework. In this work, a maximum sensitivity of up to 60 nm/% is achieved, which is 20 times higher than bulk films. It is believed that the auxetic photonic patterns with ultra-sensitive mechanochromism will provide new opportunities for the pragmatic use of mechanochromic materials in various fields, including structural health monitoring.
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Affiliation(s)
- Hwan‐Young Lee
- Department of Chemical and Biomolecular EngineeringKorea Advanced Institute of Science and Technology (KAIST)Daejeon34141Republic of Korea
| | - Minbon Gu
- Division of Advanced MaterialsKorea Research Institute of Chemical Technology (KRICT)Daejeon34114Republic of Korea
| | - Jeonghee Hwang
- Division of Advanced MaterialsKorea Research Institute of Chemical Technology (KRICT)Daejeon34114Republic of Korea
- Advanced Materials and Chemical EngineeringUniversity of Science and Technology (UST)Daejeon34113Republic of Korea
| | - Hyerim Hwang
- Department of Chemical Engineering and Materials ScienceEwha Womans UniversitySeoul03760Republic of Korea
| | - Young‐Seok Kim
- Korea Electronics Technology Institute (KETI)SeongnamGyeonggi‐do13509Republic of Korea
| | - Su Yeon Lee
- Division of Advanced MaterialsKorea Research Institute of Chemical Technology (KRICT)Daejeon34114Republic of Korea
- Advanced Materials and Chemical EngineeringUniversity of Science and Technology (UST)Daejeon34113Republic of Korea
| | - Shin‐Hyun Kim
- Department of Chemical and Biomolecular EngineeringKorea Advanced Institute of Science and Technology (KAIST)Daejeon34141Republic of Korea
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Liu B, Dong B, Xin C, Chen C, Zhang L, Wang D, Hu Y, Li J, Zhang L, Wu D, Chu J. 4D Direct Laser Writing of Submerged Structural Colors at the Microscale. Small 2023; 19:e2204630. [PMID: 36382576 DOI: 10.1002/smll.202204630] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Revised: 10/06/2022] [Indexed: 06/16/2023]
Abstract
Biomimetic stimuli-responsive structure colors (SCs) can improve the visualization and identification in the micro functional structure field such as information encryption/decryption and smart actuators. However, it is still challenging to develop the ability to 4D print arbitrary submerged colorful patterns with stimuli-responsive materials at the microscale. Herein, a hydrogel photoresist with feature resolution (98 nm) for the fabrication of 4D microscopic SCs by the femtosecond direct laser writing method is developed. The 4D printed woodpile SCs are grouped as pixel palettes with various laser parameters and they spanned almost the entire color space. The coloring mechanism of diffraction gratings is not only investigated by optics microscopy and spectroscopy but also supported by simulation. Moreover, the 4D printed hydrogel-integrated amphichromatic fish constructions and pixelated painting can visually discolor reversibly by regulating the solution pH. This finding promises an ideal coloring method for sensors, anti-counterfeiting labels, and transformable photonic devices.
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Affiliation(s)
- Bingrui Liu
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui, 230027, P. R. China
| | - Bin Dong
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui, 230027, P. R. China
| | - Chen Xin
- Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Shatin NT, Hong Kong, 999077, P. R. China
| | - Chao Chen
- School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, P. R. China
| | - Leran Zhang
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui, 230027, P. R. China
| | - Dawei Wang
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui, 230027, P. R. China
| | - Yanlei Hu
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui, 230027, P. R. China
| | - Jiawen Li
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui, 230027, P. R. China
| | - Li Zhang
- Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Shatin NT, Hong Kong, 999077, P. R. China
| | - Dong Wu
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui, 230027, P. R. China
| | - Jiaru Chu
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui, 230027, P. R. China
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