학술논문
Excess enthalpy and excess volume for binary systems of two ionic liquids + water.
Document Type
Article
Source
Subject
*ENTHALPY
*BINARY metallic systems
*IONIC liquids
*WATER
*PHYSICAL measurements
*PHYSICS experiments
*ATMOSPHERIC pressure
*NITRATES
*
*
*
*
*
*
*
Language
ISSN
1388-6150
Abstract
In this work we report the experimental measurements of excess molar enthalpy and excess molar volume, at 298.15 K and atmospheric pressure, on ethylammonium nitrate (EAN) and propylammonium nitrate (PAN) + water mixtures. Positive enthalpies were found for the two systems (maximum, at x around 0.37 correspond to about 700 and 900 J mol for EAN and PAN respectively). As the hydrophobic/hydrophilic ratio increases, along with the length of the alkyl chain in the ionic liquids, ILs, the specific interactions IL-water become less important. The excess molar volumes, V, are negative over the entire composition range for the two binary mixtures. They have similar values but curves exhibit a different asymmetric shape and around equimolar composition they intersect each other. This behaviour: positive H and negative V, is not very common. [ABSTRACT FROM AUTHOR]