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The Viscosity of Ionic Liquids
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Author(s): Dipan Kumar Das (Centurion University of Technology and Management, India), Padmaja Patnaik (Centurion University of Technology and Management, India), Sudip Kumar Das (Dr. C.V. Raman University, India)and Nibedita Nayak (Centurion University of Technology and Management, India)
Copyright: 2026
Pages: 28
Source title:
Synthesis, Characterizations, and Applications of Ionanofluids
Source Author(s)/Editor(s): Syam Sundar Lingala (Prince Mohammad Bin Fahd University, Saudi Arabia)and Muhammad Waqar Ashraf (Prince Mohammad Bin Fahd University, Saudi Arabia)
DOI: 10.4018/979-8-3373-1245-3.ch001
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Abstract
This chapter explores the viscosity of ionic liquids (ILs), highlighting its dependence on molecular structure, intermolecular interactions, and external conditions like temperature and pressure. Structural factors, such as cation size, anion nature, and functionalization, significantly impact viscosity, with fluorination, methylation, and branching altering hydrogen-bonding networks. Binary IL mixtures and IL-solvent interactions introduce non-ideal behavior due to solvation and ion-pair dynamics. Temperature and pressure modulate viscosity through ionic diffusion and intermolecular forces. Practical applications include ILs as lubricants, electrolytes, and reaction media, where viscosity is critical. Advances in computational modeling, including machine learning, enhance viscosity prediction and IL design. By integrating experimental and theoretical insights, this chapter provides a comprehensive understanding of IL viscosity and its role in next-generation technologies. Deep eutectic solvents and protic ILs offer new strategies for viscosity modulation, expanding IL applications.
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