Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/46860

TitleNatural deep eutectic solvents from choline chloride and betaine - physicochemical properties
Author(s)Aroso, Ivo Manuel Ascensão
Paiva, Alexandre
Reis, R. L.
Duarte, Ana Rita C.
KeywordsConductivity
Hydrogen bond acceptor
Hydrogen bond donor
Natural deep eutectic solvents
Rheology
Thermophysical properties
Issue dateJun-2017
PublisherElsevier B.V.
JournalJournal Of Molecular Liquids
CitationAroso I. M., Paiva A., Reis R. L., Duarte A. R. C. Natural deep eutectic solvents from choline chloride and betaine - Physicochemical properties, Journal Of Molecular Liquids, Vol. 241, pp. 654-661, doi:10.1016/j.molliq.2017.06.051, 2017
Abstract(s)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.
TypeArticle
URIhttp://hdl.handle.net/1822/46860
DOI10.1016/j.molliq.2017.06.051
ISSN0167-7322
Publisher versionhttp://www.sciencedirect.com/science/article/pii/S0167732217304427
Peer-Reviewedyes
AccessRestricted access (UMinho)
Appears in Collections:3B’s - Artigos em revistas/Papers in scientific journals

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