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Bio-based ionic liquid crystalline quaternary ammonium salts: properties and applications
Renjith Sasi1, Talasila P Rao, Sudha J Devaki
1Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST) , Thiruvananthapuram, 695019, India.
ACS Applied Materials & Interfaces
|February 28, 2014
Summary
Researchers developed novel ionic liquid crystalline quaternary ammonium salts from cashew nut shell liquid. These materials exhibit ordered mesophases and show potential as solid electrolytes due to their conductivity and stability.
Area of Science:
- Materials Science
- Physical Chemistry
- Organic Chemistry
Background:
- Cashew nut shell liquid (CNSL) is a sustainable, low-cost bio-based resource.
- Quaternary ammonium salts (QSs) are versatile compounds with applications in various fields.
- Ionic liquid crystals combine properties of ionic liquids and liquid crystals.
Purpose of the Study:
- To synthesize and characterize novel ionic liquid crystalline quaternary ammonium salts (QSs) derived from 3-pentadecylphenol.
- To investigate the liquid crystalline phase behavior and structural properties of these novel QSs.
- To explore the potential applications of these QSs as solid electrolytes.
Main Methods:
- Differential Scanning Calorimetry (DSC) for thermal analysis.
- Polarized Light Microscopy (PLM) for observing mesophase formation.
- X-ray Diffraction (XRD) for structural characterization.
- Scanning Electron Microscopy (SEM) for morphology.
- Rheology for mechanical properties.
- Electrochemical measurements for conductivity and stability.
Main Results:
- Successful synthesis of QSs from 3-pentadecylphenol.
- Formation of amphotropic liquid crystalline phases with one, two, and three-dimensionally ordered mesophases.
- Proposed a mechanism for mesophase formation and packing modes.
- Observed anisotropic ionic conductivity and good electrochemical stability.
Conclusions:
- The novel QSs derived from bio-based 3-pentadecylphenol exhibit rich liquid crystalline behavior.
- The materials form ordered mesophases, suggesting potential for self-assembly applications.
- Anisotropic ionic conductivity and electrochemical stability indicate suitability for solid electrolyte applications.
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