Chirality enhancement in macro-chiral liquid crystal nanoparticles
Yu, Huanan; Welch, Chris; Qu, Wentao; Schubert, Christopher J.; Liu, Feng; Siligardi, Giuliano; Mehl, Georg H.
Christopher J. Schubert
Professor Georg Mehl G.H.Mehl@hull.ac.uk
Professor of Organic and Materials Chemistry
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
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|
|Peer Reviewed||Peer Reviewed|
|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|
This file is under embargo until Sep 18, 2021 due to copyright reasons.
Contact G.H.Mehl@hull.ac.uk to request a copy for personal use.
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