Ionic liquids and their bases: Striking differences in the dynamic heterogeneity
near the glass transition
#MMPMID26582136
Grzybowska K
; Grzybowski A
; Wojnarowska Z
; Knapik J
; Paluch M
Sci Rep
2015[Nov]; 5
(?): 16876
PMID26582136
show ga
Ionic liquids (ILs) constitute an active field of research due to their important
applications. A challenge for these investigations is to explore properties of
ILs near the glass transition temperature Tg, which still require our better
understanding. To shed a new light on the issues, we measured ILs and their base
counterparts using the temperature modulated calorimetry. We performed a
comparative analysis of the dynamic heterogeneity at Tg for bases and their salts
with a simple monoatomic anion (Cl(-)). Each pair of ionic and non-ionic liquids
is characterized by nearly the same chemical structure but their intermolecular
interactions are completely different. We found that the size of the dynamic
heterogeneity of ILs near Tg is considerably smaller than that established for
their dipolar counterparts. Further results obtained for several other ILs near
Tg additionally strengthen the conclusion about the relatively small size of the
dynamic heterogeneity of molecular systems dominated by electrostatic
interactions. Our finding opens up new perspectives on designing different
material properties depending on intermolecular interaction types.
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