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Light-Driven Crawling of Molecular Crystals by Phase-Dependent Transient Elastic Lattice Deformation |
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| Authors: | Yanjun Gong Yongxian Guo Fayuan Ge Wei Xiong Jie Su Yang Sun Chuang Zhang An-Min Cao Yifan Zhang Jincai Zhao Yanke Che |
| Affiliation: | 1. Key Laboratory of Photochemistry, CAS Research/Education Centre for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190 China University of Chinese Academy of Sciences, Beijing, 100049 China These authors contributed equally to this work.;2. State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023 P. R. China;3. Key Laboratory of Photochemistry, CAS Research/Education Centre for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190 China University of Chinese Academy of Sciences, Beijing, 100049 China;4. College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871 China;5. CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190 China;6. Department School of Chemistry, University of Bristol, Bristol, BS8 1TS UK;7. Key Laboratory of Photochemistry, CAS Research/Education Centre for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190 China |
| Abstract: | The light-driven crawling of a molecular crystal that can form three phases, (α, β, and γ) is presented. Laser irradiation of the molecular crystal can generate phase-dependent transient elastic lattice deformation. The resulting elastic lattice deformation that follows scanning irradiation of a laser can actuate the different phases of molecular crystal to move with different velocity and direction. Because the γ phase has a large Young's modulus (ca. 26 GPa), a force of 0.1 μN can be generated under one laser spot. The generated force is sufficient to actuate the γ-formed molecular crystals in a wide dimensional range to move longitudinally at a velocity of about 60 μm min−1, which is two orders of magnitude faster than the α and β phases. |
| Keywords: | crawling movement velocity transient elastic lattice deformation transitional phase Young's modulus |