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Interplay of ion-conduction and nanoscale self-assembly in amphiphilic Janus-Type hexa-peri-hexabenzocoronenes

Ionic discotic liquid crystals combine ion conduction with fluid, yet ordered, liquid crystal phases at ambient temperature, making them suitable nanomaterials for ion transport and energy storage. A series of Janus-type hexa-peri-hexabenzocoronenes (HBCs) with ionic (sulfonate) groups covalently bo...

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Main Authors: Weigold, Svenja (Author) , Spyridakou, Marianna (Author) , Tzourtzouklis, Ioannis (Author) , Freudenberg, Jan (Author) , Bunz, Uwe H. F. (Author) , Müllen, Klaus (Author) , Floudas, George (Author)
Format: Article (Journal)
Language:English
Published: 26 July 2024
In: ACS applied nano materials
Year: 2024, Volume: 7, Issue: 14, Pages: 16256-16263
ISSN:2574-0970
DOI:10.1021/acsanm.4c02204
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1021/acsanm.4c02204
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Author Notes:Svenja Weigold, Marianna Spyridakou, Ioannis Tzourtzouklis, Jan Freudenberg, Uwe H.F. Bunz, Klaus Müllen, and George Floudas
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Summary:Ionic discotic liquid crystals combine ion conduction with fluid, yet ordered, liquid crystal phases at ambient temperature, making them suitable nanomaterials for ion transport and energy storage. A series of Janus-type hexa-peri-hexabenzocoronenes (HBCs) with ionic (sulfonate) groups covalently bonded to the HBC core, and tetraalkylammonium counterions (sizes from 0.15 to 0.95 nm) are synthesized and investigated with respect to the self-assembly and ion dynamics. We find that the counterion size affects the nanoscale self-assembly and ionic conductivity in opposite ways. Smaller counterions act as structure formers, whereas larger ones act as structure breakers. The latter exhibits the highest ion dc-conductivity. We quantify the effect of Coulomb interactions on the self-assembly, the glass temperature Tg (which was found to vary by 30 K), and the dc-conductivity (varying by 4 orders of magnitude). The precise synthesis of tailor-made ionic discotic liquid crystals with the HBC core and the characterization of their physical properties revealed that ion-conduction and nanoscale self-assembly in HBCs can be modulated by tuning electrostatic interactions, e.g., by adjusting the size of counterions.
Item Description:Online veröffentlicht: 10. Juli 2024
Gesehen am 19.12.2024
Physical Description:Online Resource
ISSN:2574-0970
DOI:10.1021/acsanm.4c02204

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