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Nano Research

, Volume 11, Issue 2, pp 1018–1028 | Cite as

Entropy-driven self-assembly of chiral nematic liquid crystalline phases of AgNR@Cu2O hyper branched coaxial nanorods and thickness-dependent handedness transition

  • Guiqing Cheng
  • Yu Wang
  • Kun Liu
  • Jihong Yu
Research Article

Abstract

The chiral nematic liquid crystalline phase (CNLCP) of noble metal nanorods induces a strong chiroptical response due to their intrinsic physical and chemical properties. Here, we demonstrate that the formation of CNLCP of Ag nanorods (AgNRs) originates from their bent-shape and is the result of purely entropic effects. The chirality of the liquid crystalline phase of AgNR@Cu2O hyper branched coaxial nanorods (HBCNRs) can be switched from left-handed to right-handed by increasing Cu2O thickness. It is proposed that the increase of coating thickness decreases the curvature of nanorods, which induces variation of the twist constant (K2) and bend elastic constant (K3). The increased thickness also changes the direction of director with respect to the helical axis. In addition, hydrogen bonds can break the CNLCP, which can be attributed to their stronger effection compared to van der Waals forces and electrostatic interactions. In contrast to the variation of coating thickness, the surface morphology, constituents of the hybrid building blocks and polarity of the solvents do not play important roles in the handedness transition of the liquid crystalline phase. Furthermore, the results presented here give insight into the structure–property relationship and our strategy provides guidance for the synthesis of other inorganic chiral suprastructures driven by entropic effects.

Keywords

chirality circular dichroism Ag nanorod (AgNR)@Cu2liquid crystals chiroptical response 

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Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 20971051 and 21621001), and the Education Department of Jilin Province (No. 2016407). We are very grateful to Prof. Xudong Zhao for helpful discussion.

Supplementary material

12274_2017_1715_MOESM1_ESM.pdf (7.1 mb)
Entropy-driven self-assembly of chiral nematic liquid crystalline phases of AgNR@Cu2O hyper branched coaxial nanorods and thickness-dependent handedness transition

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Copyright information

© Tsinghua University Press and Springer-Verlag GmbH Germany 2018

Authors and Affiliations

  1. 1.State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of ChemistryJilin UniversityChangchunChina
  2. 2.State Key Laboratory of Supramolecular Structure and Materials, College of ChemistryJilin UniversityChangchunChina

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