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Transport of ions and electrons in nanostructured liquid crystals

Abstract

The nanosegregated structures of columnar, smectic and bicontinuous cubic liquid crystals can provide well-organized, nano- and sub-nanosized 1D, 2D and 3D channels capable of ion and electron transport. The molecular shape, intermolecular interactions and nanosegregation of the molecular structures can influence their self-assembly into a range of functional liquid-crystalline nanostructures. The formation of stable and soft liquid-crystalline materials leads to their application as electrolytes for batteries and photovoltaics, semiconductors, electroluminescence and electrochemical devices. In addition, electrochemical devices are obtained by using redox-active liquid crystals. In this Review, we focus on the design of liquid-crystalline phases, the resultant self-assembled structures, the transport mechanisms, and the fabrication, function and future development of devices incorporating nanostructured liquid crystals.

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Figure 1: A timeline of the molecular design of liquid crystals.
Figure 2: A timeline of the development of liquid crystals for transport.
Figure 3: Dimension control of ion conduction channels.
Figure 4: Orientation control of smectic liquid-crystalline domains.
Figure 5: Orientation control of columnar liquid-crystal domains.
Figure 6: The design of charge-transport (electron or hole) liquid crystals.
Figure 7: The design of charge-transport (electron or hole) smectic and nematic liquid crystals and their chiral derivatives.
Figure 8: Organic electronic devices using charge-transport liquid crystals.
Figure 9: Redox-active liquid-crystalline materials.

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Acknowledgements

T.K. appreciates support by Core Research for Evolutional Science and Technology (CREST), Japan Science & Technology Agency (JST), Grant-in-Aid for Scientific Research (KAKENHI) from Ministry of Education, Culture, Sports, (MEXT), and FIRST programme from Cabinet Office, Government of Japan. The authors thank K. Takimiya at RIKEN and T. Okamoto at the University of Tokyo for helpful suggestions.

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Kato, T., Yoshio, M., Ichikawa, T. et al. Transport of ions and electrons in nanostructured liquid crystals. Nat Rev Mater 2, 17001 (2017). https://doi.org/10.1038/natrevmats.2017.1

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