Lars Evenäs
Professor at Chalmers University of Technology
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Articles (11)
Transport Properties of Protic Ionic Liquids Based on Triazolium and Imidazolium: Development of an Air-Free Conductivity Setup
The dynamical properties of four protic ionic liquids, based on the ethyltriazolium ([C2HTr124]) and the ethylimidazolium ([C2HIm]) cation, were investigated. The associated anions were the triflate ([TfO]) and the bistriflimide ([TFSI]). Ionic conductivity values and self-diffusion coefficients were measured and discussed, extending the discussion to the concept of fragility. Furthermore, in order to allow the measurement of the ionic conductivity of very small volumes (<0.5 mL) of ionic liquid under an inert and dry atmosphere, a new setup was developed. It was found that the cation nature strongly affected the transport properties, the [C2HTr124] cation resulting in slower dynamics than the [C2HIm] one. This was concluded from both conductivity and diffusivity measurements while for both properties, the anion had a lesser effect. By fitting the conductivity data with the Vogel–Fulcher–Tammann (VFT) equation, we could also estimate the fragility of these ionic liquids, which all fell in the range of very fragile glass-forming materials. Finally, the slower dynamics observed in the triazolium-based ionic liquids can be rationalized by the stronger interactions that this cation establishes with both anions, as deduced from the frequency analysis of relevant Raman signatures and density functional theory (DFT) calculations.
Year:
2023
Microcapsule functionalization enables rate-determining release from cellulose nonwovens for long-term performance
Microcapsule functionalization provides textile materials with controllable release rate-limiting properties. This enables sustained and predictable release of actives and extension of the functional lifetimes of these materials from hours to weeks.
Year:
2023
Collaborators (5)
Xavier Crispin
Professor
Linköping University
Aleksandar Matic
-
Karl Börjesson
-
Markus Andersson Trojer
Chalmers University of Technology
Anna Martinelli
Professor at Chalmers University of Technology
Chalmers University of Technology

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