A force field for bio-polymers in ionic liquids (BILFF) - part 1: [EMIm][OAc]/water mixtures
1Institut für Chemie - Theoretische Chemie, Martin-Luther-Universität Halle-Wittenberg, Von-Danckelmann-Platz 4, 06120 Halle (Saale), Germany. Martin_Brehm@gmx.de.
Physical Chemistry Chemical Physics : PCCP
|December 23, 2020
Summary
We developed BILFF, a new force field for simulating bio-polymers in ionic liquids. This tool accurately models cellulose dissolution in 1-ethyl-3-methylimidazolium acetate ([EMIm][OAc]) and water mixtures, crucial for materials science applications.
Area of Science:
- Computational chemistry
- Materials science
- Polymer science
Background:
- Ionic liquids (ILs) like 1-ethyl-3-methylimidazolium acetate ([EMIm][OAc]) can dissolve cellulose.
- Simulating cellulose dissolution requires accurate force fields for IL-water mixtures.
- Existing force fields lack optimization for [EMIm][OAc]/water systems.
Purpose of the Study:
- Introduce BILFF, a novel force field for bio-polymers in ionic liquids.
- Optimize force field parameters for [EMIm][OAc]/water mixtures.
- Enable accurate molecular dynamics simulations of cellulose dissolution.
Main Methods:
- Optimized force field parameters using ab initio molecular dynamics (AIMD) simulations.
- Validated parameters against distribution functions, hydrogen bond lifetimes, and diffusion coefficients.
- Compared simulation results to experimental data (thermal expansion, bulk modulus, density).
Main Results:
- BILFF accurately reproduces key structural and dynamic properties of [EMIm][OAc]/water mixtures.
- The force field captures non-trivial interactions like dispersion and π-π stacking.
- Simulations show good agreement with experimental bulk properties across temperatures.
Conclusions:
- BILFF provides a reliable computational tool for studying cellulose dissolution in [EMIm][OAc]/water.
- This novel force field advances molecular simulations in ionic liquid systems.
- Future work will extend BILFF to other ILs and bio-polymers.
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