Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 241, Issue -, Pages 654-661Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molliq.2017.06.051
Keywords
Natural deep eutectic solvents; Thermophysical properties; Rheology; Conductivity; Hydrogen bond donor; Hydrogen bond acceptor
Funding
- FCT [SFRH/BD/42273/2007]
- European Union Seventh Framework Programme (FP7) [REGPOT-CT2012-316331-POLARIS]
- Project Novel smart and biomimetic materials for innovative regenerative Medicine approaches - North Portugal Regional Operational Programme (ON.2 - O Novo Norte), under the National Strategic Reference Framework (NSRF) [RL1 - ABMR - NORTE-01-0124-FEDER-000016]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/42273/2007] Funding Source: FCT
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The preparation of natural deep eutectic solvents (NADESs) from cheap and readily available raw materials is reported. In this work, we have considered mixtures of choline chloride (CC) or betaine (Bet) with 3 sugar molecules (glucose (Glu), xylose (Xyl) and sucrose (Suc)) and 2 carboxylic acids (citric (CA) and tartaric (Tart) acids). The formation of NADESs was investigated by polarized optical microscopy (POM) and differential scanning calorimetry (DSC). The CC mixtures give origin to NADESs for 1:1 M ratio with the sugar molecules and for 2:1, 1:1 and 1:2 with the carboxylic acids, while Bet mixtures only formed NADES with the carboxylic acids. The effect of water content (up to 5% (wt.%)) and temperature in conductivity and rheology were characterized. The NADESs were found to be non-thixotropic, Newtonian liquids with high viscosity, decreasing with increasing temperature and water content. The conductivity is limited by charge carrier mobility, thus increasing with water content and temperature. (C) 2017 Elsevier B.V. All rights reserved.
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