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Chirality enhancement in macro-chiral liquid crystal nanoparticles

Yu, Huanan; Welch, Chris; Qu, Wentao; Schubert, Christopher J.; Liu, Feng; Siligardi, Giuliano; Mehl, Georg H.

Authors

Huanan Yu

Chris Welch

Wentao Qu

Christopher J. Schubert

Feng Liu

Giuliano Siligardi



Abstract

The amplification of molecular chirality by metal nanoparticles (NPs) is an important and rapidly evolving field in nanomaterial research with wide applications in smart materials, catalysis, and solvent-solute interactions. Here we present the results of the synthesis of gold nanoparticles (AuNPs) functionalized both with chiral ligands based on the binaphthol motif and with nematogenic groups (ChirAuLC). The materials were characterized chemically and the ratios between chiral groups and LC groups was determined. Synchrotron radiation circular dichroism (SRCD) and synchrotron based X-ray diffraction (XRD) studies show that the AuNPs favoured by the LC state arrange themselves into ordered columns and a helical superstructure appears in the mesophase of collective NPs. A specific focus has been the investigation of the chiral induction of ChirAuLC composites in two different nematic LC hosts. For a number of selected mixtures, the helical twisting power (HTP) of these NPs in systems was calculated from systematic optical observations based on optical polarizing microscopy (OPM). The experimental data show that the HTP of the investigated ChirAuLC composite is significantly larger than that of free "small molecule"chiral groups when dispersed in the same LC host and the chiral transfer efficiency of ChirAuLC is higher than NPs functionalized only with chiral groups (ChirAuNP). This is new and can be explained by a combination of a surface chirality and the domino effect of bound mesogens interacting with the bulk. This journal is

Citation

Yu, H., Welch, C., Qu, W., Schubert, C. J., Liu, F., Siligardi, G., & Mehl, G. H. (2020). Chirality enhancement in macro-chiral liquid crystal nanoparticles. Materials Horizons, 7(11), 3021-3027. https://doi.org/10.1039/d0mh01274b

Journal Article Type Article
Acceptance Date Sep 15, 2020
Online Publication Date Sep 17, 2020
Publication Date Nov 1, 2020
Deposit Date Sep 30, 2020
Publicly Available Date Sep 18, 2021
Journal Materials Horizons
Print ISSN 2051-6347
Electronic ISSN 2051-6355
Peer Reviewed Peer Reviewed
Volume 7
Issue 11
Pages 3021-3027
DOI https://doi.org/10.1039/d0mh01274b
Public URL https://hull-repository.worktribe.com/output/3620268
Publisher URL https://pubs.rsc.org/en/content/articlelanding/2020/MH/D0MH01274B#!divAbstract
Additional Information : This document is Similarity Check deposited; : Supplementary Information; : Huanan Yu (ORCID); : Chris Welch (ORCID); : Feng Liu (ORCID); : Feng Liu (ResearcherID); : Giuliano Siligardi (ORCID); : Georg H. Mehl (ORCID); : Single-blind; : Received 6 August 2020; Accepted 15 September 2020; Accepted Manuscript published 17 September 2020; Advance Article published 29 September 2020