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13 March 2024 Dynamic heterogeneity in nematic liquid crystal gels and glasses observed by the novel fluctuation microscopy
Jun Yamamoto
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Proceedings Volume PC12907, Emerging Liquid Crystal Technologies XIX; PC129070I (2024) https://doi.org/10.1117/12.3001040
Event: SPIE OPTO, 2024, San Francisco, California, United States
Abstract
In the glass or gel states, materials have perfect isotropic symmetry and transparency. However, even if physical quantities such as density, concentration, and orientation are uniform, spatial heterogeneity in mobility may appear, which is called “dynamic heterogeneity”. we have invented a new fluctuation microscope that directly visualizes the dynamic inhomogeneity. In this report, as a model system for observing dynamic inhomogeneity, we observed swollen liquid crystalline nematic gels and polymers. Orientational order is encapsulated in polymer chains. Both dynamics of the nematic director and conformation of polymer chains are dynamically coupled with each other. We have recorded this polymerization process using a fluctuation microscope from immediately after UV irradiation, and directly confirmed that the dynamics of the orientation fluctuation gradually decelerates with the passage of polymerization process. We also success to confirm that the dynamic inhomogeneity appears in space, based on the time evolution analysis of the image of special distribution of the amplitude and the relaxation time of the director fluctuation observed by the fluctuation microscopy.
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Jun Yamamoto "Dynamic heterogeneity in nematic liquid crystal gels and glasses observed by the novel fluctuation microscopy", Proc. SPIE PC12907, Emerging Liquid Crystal Technologies XIX, PC129070I (13 March 2024); https://doi.org/10.1117/12.3001040
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KEYWORDS
Liquid crystals
Glasses
Inhomogeneities
Polymers
Microscopes
Optical microscopy
Polymerization
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