Biomaterials, Biodegradables and Biomimetics Research Group

Papers in Scientific Journals

Natural deep eutectic solvents from choline chloride and betaine - Physicochemical properties

Abstract

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.

Journal
Journal Of Molecular Liquids
Volume
241
Pagination
654-661
Publisher
Elsevier
ISSN
0167-7322
URL
http://www.sciencedirect.com/science/article/pii/S0167732217304427
Keywords
conductivity, Hydrogen bond acceptor, Hydrogen bond donor, Natural deep eutectic solvents, rheology, Thermophysical properties
Rights
Restricted Access
Peer Reviewed
Yes
Status
published
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