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Gonçalves DPN, Ogolla T, Hegmann T. Chirality Transfer from an Innately Chiral Nanocrystal Core to a Nematic Liquid Crystal 2: Lyotropic Chromonic Liquid Crystals. Chemphyschem 2023; 24:e202200685. [PMID: 36197761 PMCID: PMC10092345 DOI: 10.1002/cphc.202200685] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Revised: 10/04/2022] [Indexed: 02/03/2023]
Abstract
The importance of and the difference between molecular versus structural core chirality of substances that form nanomaterials, and their ability to transmit and amplify their chirality to and within a surrounding condensed medium is yet to be exactly understood. Here we demonstrate that neat as well as disodium cromoglycate (DSCG) surface-modified cellulose nanocrystals (CNCs) with both molecular and morphological core chirality can induce homochirality in racemic nematic lyotropic chromonic liquid crystal (rac-N-LCLC) tactoids. In comparison to the parent chiral organic building blocks, D-glucose, endowed only with molecular chirality, both CNCs showed a superior chirality transfer ability. Here, particularly the structurally compatible DSCG-modified CNCs prove to be highly effective since the surface DSCG moieties can insert into the DSCG stacks that constitute the racemic tactoids. Overall, this presents a highly efficient pathway for chiral induction in an aqueous medium and thus for understanding the origins of biological homochirality in a suitable experimental system.
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Affiliation(s)
- Diana P N Gonçalves
- Advanced Materials and Liquid Crystal Institute and, Department of Chemistry and Biochemistry, Kent State University, Kent, OH 44242-0001, USA
| | - Timothy Ogolla
- Materials Science Graduate Program, Kent State University, Kent, OH 44242-0001, USA
| | - Torsten Hegmann
- Advanced Materials and Liquid Crystal Institute and, Department of Chemistry and Biochemistry, Kent State University, Kent, OH 44242-0001, USA.,Materials Science Graduate Program, Kent State University, Kent, OH 44242-0001, USA
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Paparini S, Virga EG. Paradoxes for chromonic liquid crystal droplets. Phys Rev E 2022; 106:044703. [PMID: 36397539 DOI: 10.1103/physreve.106.044703] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 10/02/2022] [Indexed: 06/16/2023]
Abstract
Chromonic liquid crystals constitute a novel lyotropic phase, whose elastic properties have so far been modeled within the classical Oseen-Frank theory, provided that the twist constant is assumed to be considerably smaller than the saddle-splay constant, in violation of one Ericksen inequality. This paper shows that paradoxical consequences follow from such a violation for droplets of these materials surrounded by an isotropic fluid. For example, tactoids with a degenerate planar anchoring simply disintegrate indefinitely in myriads of smaller ones.
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Affiliation(s)
- Silvia Paparini
- Dipartimento di Matematica, Università di Pavia, Via Ferrata 5, 27100 Pavia, Italy
| | - Epifanio G Virga
- Dipartimento di Matematica, Università di Pavia, Via Ferrata 5, 27100 Pavia, Italy
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Gonçalves DPN, Hegmann T. Chirality Transfer from an Innately Chiral Nanocrystal Core to a Nematic Liquid Crystal: Surface‐Modified Cellulose Nanocrystals. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202105357] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Diana P. N. Gonçalves
- Advanced Materials and Liquid Crystal Institute Kent State University Kent OH 44242-0001 USA
| | - Torsten Hegmann
- Advanced Materials and Liquid Crystal Institute Kent State University Kent OH 44242-0001 USA
- Department of Chemistry and Biochemistry, Materials Science Graduate Program, and Brain Health Research Institute Kent State University Kent OH 44242-0001 USA
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Gonçalves DPN, Hegmann T. Chirality Transfer from an Innately Chiral Nanocrystal Core to a Nematic Liquid Crystal: Surface-Modified Cellulose Nanocrystals. Angew Chem Int Ed Engl 2021; 60:17344-17349. [PMID: 33949085 DOI: 10.1002/anie.202105357] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Indexed: 12/16/2022]
Abstract
The vast majority of nanomaterials studied in light of their ability to transmit chirality to or amplify their chirality in a surrounding medium, constitute an achiral core with chirality solely installed at the surface by conjugation or encapsulation with optically active ligands. Here we present the inverse approach focusing on surface-modified cellulose nanocrystals (CNCs) with core chirality at both the molecular and the morphological level to quantify transmission and amplification of core chirality through space using a host nematic liquid crystal (N-LC) as reporter. We find that CNCs functionalized at the surface with achiral molecules, structurally related to the N-LC, exhibit better N-LC solubility, thereby serving as highly efficient chiral inducers. Moreover, functionalization with chiral molecules only marginally enhances the efficacy of helical distortion in the host N-LC matrix, indicating the high propensity of CNCs to transfer chirality from an inherently chiral core.
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Affiliation(s)
- Diana P N Gonçalves
- Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, OH, 44242-0001, USA
| | - Torsten Hegmann
- Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, OH, 44242-0001, USA.,Department of Chemistry and Biochemistry, Materials Science Graduate Program, and Brain Health Research Institute, Kent State University, Kent, OH, 44242-0001, USA
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Yu H, Qu W, Liu F, Mehl GH. Two helices from one chiral centre - self organization of disc shaped chiral nanoparticles. Chem Sci 2020; 12:1778-1782. [PMID: 34163939 PMCID: PMC8179125 DOI: 10.1039/d0sc05100d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Accepted: 11/30/2020] [Indexed: 11/21/2022] Open
Abstract
Gold nanoparticles (AuNPs) have been prepared and surface-functionalized with a mixture of 1-hexanethiol co-ligands and chiral discogen ligands separated from a disulfide function via a flexible spacer. Polarized optical microscopy together with differential scanning calorimetry showed that the organic corona of the nanocomposite forms a stable chiral discotic nematic phase with a wide thermal range. Synchrotron X-ray diffraction showed that gold NPs form a superlattice with p2 plane symmetry. Analysis indicated that the organic corona takes up the shape of a flexible macrodisk. Synchrotron radiation-based circular dichroism signals of thin films are significantly enhanced on the isotropic-LC transition, in line with the formation of a chiral nematic phase of the organic corona. At lower temperatures the appearance of CD signals at longer wavelengths is associated with the chiral organisation of the NPs and is indicative of the formation of a second helical structure. The decreased volume required and the chiral environment of the disc ligands drives the nanoparticles into columns that arrange helically, parallel to the shortest axis of the two dimensional lattice.
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Affiliation(s)
- Huanan Yu
- Department of Chemistry, University of Hull Hull HU6 7RX UK
| | - Wentao Qu
- State Key Laboratory for Mechanical Behaviour of Materials, Shaanxi International Research Centre for Soft Matter, Xi'an Jiaotong University Xi'an P. R. China
| | - Feng Liu
- State Key Laboratory for Mechanical Behaviour of Materials, Shaanxi International Research Centre for Soft Matter, Xi'an Jiaotong University Xi'an P. R. China
| | - Georg H Mehl
- Department of Chemistry, University of Hull Hull HU6 7RX UK
- State Key Laboratory for Mechanical Behaviour of Materials, Shaanxi International Research Centre for Soft Matter, Xi'an Jiaotong University Xi'an P. R. China
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Bosire R, Ndaya D, Kasi RM. Recent progress in functional materials from lyotropic chromonic liquid crystals. POLYM INT 2020. [DOI: 10.1002/pi.6113] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Reuben Bosire
- Department of Chemistry University of Connecticut Storrs CT USA
| | - Dennis Ndaya
- Department of Chemistry University of Connecticut Storrs CT USA
| | - Rajeswari M Kasi
- Department of Chemistry University of Connecticut Storrs CT USA
- Polymer Program, Institute of Material Science University of Connecticut Storrs CT USA
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Shadpour S, Nemati A, Liu J, Hegmann T. Directing the Handedness of Helical Nanofilaments Confined in Nanochannels Using Axially Chiral Binaphthyl Dopants. ACS APPLIED MATERIALS & INTERFACES 2020; 12:13456-13463. [PMID: 32092259 DOI: 10.1021/acsami.9b20696] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
In this work, we demonstrate control of the handedness of semicrystalline modulated helical nanofilaments (HNFmods) formed by achiral bent-core liquid crystal molecules by axially chiral binaphthyl-based additives as guest molecules solely under spatial nanoconfinement in anodic aluminum oxide nanochannels. The molecules of the same chiral additives are expelled from the HNFmods in the bulk, and as a result thereof do not affect the handedness or helical pitch of bulk HNFmods, resulting in an HNFmod conglomerate with chirality-preserving growth within each domain. However, under confinement these axially chiral guest molecules, likely embedded in the HNFmod host, do affect the helicity of the HNFmods. The configuration of the axially chiral molecules decides the HNFmod helix handedness and their concentration, and the helix angle is related to the helical pitch of the HNFmods. In addition to local imaging data obtained by scanning electron microscopy, global studies by thin-film circular dichroism spectropolarimetry support the imaging results.
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Affiliation(s)
- Sasan Shadpour
- Chemical Physics Interdisciplinary Program, Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, Ohio 44242-0001, United States
| | - Ahlam Nemati
- Chemical Physics Interdisciplinary Program, Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, Ohio 44242-0001, United States
| | - Jiao Liu
- Chemical Physics Interdisciplinary Program, Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, Ohio 44242-0001, United States
| | - Torsten Hegmann
- Chemical Physics Interdisciplinary Program, Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, Ohio 44242-0001, United States
- Department of Chemistry and Biochemistry, Kent State University, Kent, Ohio 44242-0001, United States
- Brain Health Research Institute, Kent State University, Kent, Ohio 44242-0001, United States
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Sandhya K, Pushpavathi N, Rao DS, Prasad SK. Dielectric and electro optic studies in the vicinity of the transition between two tilted hexatic phases of a ZnO-liquid crystal nanocomposite. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112508] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Nemati A, Shadpour S, Querciagrossa L, Mori T, Zannoni C, Hegmann T. Highly Sensitive, Tunable Chirality Amplification through Space Visualized for Gold Nanorods Capped with Axially Chiral Binaphthyl Derivatives. ACS NANO 2019; 13:10312-10326. [PMID: 31424907 DOI: 10.1021/acsnano.9b03787] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The creation and transmission of chirality in molecular systems is a well-known, widely applied notion. Our understanding of how the chirality of nanomaterials can be controlled, measured, transmitted through space, and applied is less well understood. Dynamic assemblies for chiral sensing or metamaterials engineered from chiral nanomaterials require exact methods to determine transmission and amplification of nanomaterial chirality through space. We report the synthesis of a series of gold nanorods (GNRs) with a constant aspect ratio of ∼4.3 capped with C2-symmetric, axially chiral binaphthyl thiols, preparation of dispersions in the nematic liquid crystal 5CB, measurements of the helical pitch, and the determination of the helical twisting power as well as the average distance between the chiral nanomaterial additives. By comparison to the neat organic chiral derivatives, we demonstrate how the amplification of chirality facilitated by GNRs decorated with chiral molecules can be used to clearly distinguish the chiral induction strength of a homologous series of binaphthyl derivatives, differing only in the length of the nontethered aliphatic chain, in the induced chiral nematic liquid crystal phase. Considering systematic errors in sample preparation and optical measurements, these chiral molecules would otherwise be deemed identical with respect to chiral induction. Notably, we find some of the highest ever-reported values of the helical twisting power. We further support our experimentally derived arguments of a more comprehensive understanding of chirality transfer by calculations of a suitable pseudoscalar chirality indicator.
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Affiliation(s)
- Ahlam Nemati
- Advanced Materials and Liquid Crystal Institute, Chemical Physics Interdisciplinary Program , Kent State University , Kent , Ohio 44242 , United States
| | - Sasan Shadpour
- Advanced Materials and Liquid Crystal Institute, Chemical Physics Interdisciplinary Program , Kent State University , Kent , Ohio 44242 , United States
| | - Lara Querciagrossa
- Dipartimento di Chimica Industriale "Toso Montanari" and INSTM , Università di Bologna , Viale Risorgimento 4 , IT-40136 Bologna , Italy
| | - Taizo Mori
- Graduate School of Frontier Science , The University of Tokyo , 5-1-5, Kashiwanoha , Kashiwa 277-0827 , Japan
| | - Claudio Zannoni
- Dipartimento di Chimica Industriale "Toso Montanari" and INSTM , Università di Bologna , Viale Risorgimento 4 , IT-40136 Bologna , Italy
| | - Torsten Hegmann
- Advanced Materials and Liquid Crystal Institute, Chemical Physics Interdisciplinary Program , Kent State University , Kent , Ohio 44242 , United States
- Department of Chemistry and Biochemistry , Kent State University , Kent , Ohio 44242 , United States
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