Please use this identifier to cite or link to this item:
Title: Understanding the role of the hydrogen bond donor of the deep eutectic solvents in the formation of the aqueous biphasic systems
Author: Farias, Fabiane Oliveira
Pereira, Jorge F.B.
Coutinho, João A.P.
Igarashi-Mafra, Luciana
Mafra, Marcos R.
Keywords: Deep eutectic solvents, lignin model compound, ether bond cleavage, reaction mechanism, sustainable delignification
Cholinium chloride
Logarithm of octanol-water partition coefficient
Hydrogen bond donor
Hydrogen bond acceptor
Issue Date: 1-Jan-2020
Publisher: Elsevier
Abstract: Deep eutectic solvents (DES) have been proposed as phase-forming compounds of aqueous biphasic systems (ABS). However, due to DES nature and the high water content of the ABS, their nature and behavior remains controversial. To foster the understanding of DES-based ABS, the present work uses the relative hydrophilicity of the hydrogen bond donor (HBD) as a descriptor to clarify its role on ABS for- mation and phase properties. Dipotassium phosphate (K2HPO4)-based ABS phase diagrams composed of cholinium chloride ([N111(2OH)]Cl), as hydrogen bond acceptor (HBA), and several HBD (alcohols and sugars) were compared in molality units and the saturation solubility point for each binodal curve determined. The results here reported establish the HBD role as function of its relative hydrophilicity: very hydrophilic HBD act only as an adjuvant in the formation of ABS; HBD of intermediate hydrophilicity influence the ABS formation; while the most hydrophobic HBD tend to form organic-aqueous two-phase systems, where the HBA acts as an adjuvant to the system.
Peer review: yes
DOI: 10.1016/j.fluid.2019.112319
ISSN: 0378-3812
Appears in Collections:CICECO - Artigos

Files in This Item:
File Description SizeFormat 
j.fluid.2019.112319.pdf954.81 kBAdobe PDFView/Open

Formato BibTex MendeleyEndnote Degois 

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.