Understanding the role of water in the lyotropic liquid crystalline mesophase of high-performance flexible supercapacitor electrolytes using a rheological approach

Mert Umut Özkaynak*, Banu Kocaaga, Koray Bahadır Dönmez, Selin Dağlar, Yurdanur Türker, Nilgün Karatepe, F. Seniha Güner, Ömer Dag

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Özet

The effect of water on the structure, properties, and flexibility of lyotropic liquid crystalline (LLC) C12E23-LiCl-H2O gel electrolytes was explored. Structural techniques, such as X-ray Diffraction (XRD), Polarized Optical Microscopy (POM), and five dynamic measurements, were employed to examine the rheological properties of the LLC mesophase across various water contents. These analyses provided quantitative insights into the influence of water content and LiCl concentration on gel strength, gelation point, and structural recovery. The three-dimensional network of the gel encapsulates Li+ and Cl ions within hydrophilic domains, showing significant performance in supercapacitor applications. The observed increase in storage modules with decreasing water content is attributed to variations in the quantity and average size of junction points owing to system entanglement. These research findings highlight that excess water molecules, which break down micellar connections, are responsible for the weakening of the gel. Conversely, at low water concentrations, the micellar domains entangle, displaying viscoelastic behavior akin to that of a transitory polymer network.

Orijinal dilİngilizce
Makale numarası123705
DergiJournal of Molecular Liquids
Hacim394
DOI'lar
Yayın durumuYayınlandı - 15 Oca 2024

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Publisher Copyright:
© 2023 Elsevier B.V.

Finansman

This work was financially supported by Sabanci University Nanotechnology Research and Application Center (SUNUM) and Istanbul Technical University (ITU) Department of Materials Science and Engineering. The funders had no role in the study design, data collection and analysis, decision to publish, or manuscript preparation.

FinansörlerFinansör numarası
Department of Materials Science and Engineering
SUNUM
Sabanci University Nanotechnology Research and Application Center
Istanbul Teknik Üniversitesi

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