TY - JOUR
T1 - Solvation in Ionic Liquids with Polymer-Grafted Nanoparticles
AU - Liu, Siqi
AU - Walton, Mia
AU - Tarakina, Nadezda V.
AU - Akcora, Pinar
N1 - Publisher Copyright:
© 2020 American Chemical Society.
PY - 2020/6/11
Y1 - 2020/6/11
N2 - Polymer-grafted nanoparticles stabilized in ionic liquid (IL)-solvent mixtures are investigated by using transmission electron microscopy, dynamic light scattering, and electrochemical impedance spectroscopy. The ionic conductivity of IL-solvent mixtures with the polymer-grafted nanoparticles is found to be higher than that of nanoparticles in the IL. These particles offer additional interactions between polymer and IL, which can mitigate solvation in ILs with solvents. Motivated by this, we present the conductivity data of 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (HMIM-TFSI) with poly(methyl methacrylate) (PMMA)-grafted particles in good and bad solvents and further discuss how graft density influences the swelling of PMMA and solvation characteristics of HMIM-TFSI. We found that HMIM-TFSI-acetonitrile containing high grafting density particles has a higher conductivity than that of the HMIM-TFSI-methanol mixture with grafted particles. Thus, solubility of PMMA in acetonitrile and preferential interactions between PMMA-HMIM-TFSI are shown to govern the swelling, solvation, and conductive properties of IL with the polymer-grafted nanoparticles.
AB - Polymer-grafted nanoparticles stabilized in ionic liquid (IL)-solvent mixtures are investigated by using transmission electron microscopy, dynamic light scattering, and electrochemical impedance spectroscopy. The ionic conductivity of IL-solvent mixtures with the polymer-grafted nanoparticles is found to be higher than that of nanoparticles in the IL. These particles offer additional interactions between polymer and IL, which can mitigate solvation in ILs with solvents. Motivated by this, we present the conductivity data of 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (HMIM-TFSI) with poly(methyl methacrylate) (PMMA)-grafted particles in good and bad solvents and further discuss how graft density influences the swelling of PMMA and solvation characteristics of HMIM-TFSI. We found that HMIM-TFSI-acetonitrile containing high grafting density particles has a higher conductivity than that of the HMIM-TFSI-methanol mixture with grafted particles. Thus, solubility of PMMA in acetonitrile and preferential interactions between PMMA-HMIM-TFSI are shown to govern the swelling, solvation, and conductive properties of IL with the polymer-grafted nanoparticles.
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U2 - 10.1021/acs.jpcb.0c02813
DO - 10.1021/acs.jpcb.0c02813
M3 - Article
C2 - 32423211
AN - SCOPUS:85086346244
SN - 1520-6106
VL - 124
SP - 4843
EP - 4850
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
IS - 23
ER -