Deep Eutectic Solvents: A New Class of Versatile Liquids

Gurkan, Burcu; Maginn, Edward J.; Pentzer, Emily

doi:10.1021/acs.jpcb.0c10099

Cited by 24 publications

(10 citation statements)

References 43 publications

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“…[29,30] In these soft conductors, the liquid phase is a deep eutectic solvent (DES), sharing many of the features of the ILs like high thermal stability and ionic conductivity, but benefiting from easy preparation, low cost, and noncytotoxicity. [31][32][33] Up to now, only a few examples of purely ionic conductive eutectogels for bioelectronics have been reported. [34][35][36][37] Very recently, Ouyang et al prepared waterborne polyurethane-based eutectogels using choline chloride (ChCl)/glycerol (Gly) DES and tannic acid as a crosslinker for self-adhesive bioelectrodes.…”

Section: Introductionmentioning

confidence: 99%

Mixed Ionic and Electronic Conducting Eutectogels for 3D‐Printable Wearable Sensors and Bioelectrodes

Picchio

Gallastegui

Casado

et al. 2022

Adv Materials Technologies

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like poly (3,4-ethylenedioxythiophene):poly( styrene sulfonate) (PEDOT:PSS), stand out for this application due to their enhanced charge storage and coupled transport properties. [2][3][4] These functional materials are commonly used for recording physiological signals, assessing biochemical information, and electrical stimulation/ modulation. Ionic-electronic conductive hydrogels are another important family of soft conductors that have been broadly explored in healthcare technologies due to their similarities to biological tissues and tunability in terms of electronic, mechanical, and chemical properties. [5] In particular, natural biopolymers-based hydrogels are attractive platforms for wearable devices as they combine inherent renewable, non-toxic features, biocompatibility, and biodegradability. [6,7] Several examples of natural biopolymers have been reported as promising building blocks in stretchable devices, including cellulose, [8][9][10] chitosan, [11][12][13] alginate, [14][15][16] silk fibroin, [17,18] and gelatin. [19][20][21] Unfortunately, these conductive hydrogels fail in long-lasting signals recording due to the continuous water evaporation in open-air sensors and bioelectrodes. At this point, ionic liquid Eutectogels are a new class of soft ion conductive materials that are attracting attention as an alternative to conventional hydrogels and costly ionic liquid gels to build wearable sensors and bioelectrodes. Herein, the first example of mixed ionic and electronic conductive eutectogels showing high adhesion, flexibility, nonvolatility, and reversible low-temperature gel transition for 3D printing manufacturing is reporting. The eutectogels consist of choline chloride/glycerol deep eutectic solvent, poly(3,4-ethylenedioxythiophene): lignin sulfonate, and gelatin as the biocompatible polymer matrix. These soft materials are flexible and stretchable, show high ionic and electronic conductivities of 7.3 and 8.7 mS cm −1 , respectively, and have high adhesion energy. Due to this unique combination of properties, they could be applied as strain sensors to precisely detect physical movements. Furthermore, these soft mixed ionic electronic conductors possess excellent capacity as conformal electrodes to record epidermal physiological signals, such as electrocardiograms and electromyograms, over a long time.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/admt.202101680.

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Section: Introductionmentioning

confidence: 99%

Mixed Ionic and Electronic Conducting Eutectogels for 3D‐Printable Wearable Sensors and Bioelectrodes

Picchio

Gallastegui

Casado

et al. 2022

Adv Materials Technologies

View full text Add to dashboard Cite

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“…A very promising cheaper and “green” subclass of ILs, deep eutectic solvents (DES), has been attracting tremendous interest over the recent years [ 45 , 46 , 47 ]. DES can be easily prepared from two components (hydrogen bond donor (HBD) and acceptor (HBA)) with melting temperature significantly below the melting temperatures of the individual components.…”

Section: Introductionmentioning

confidence: 99%

Polymerizable Choline- and Imidazolium-Based Ionic Liquids Reinforced with Bacterial Cellulose for 3D-Printing

et al. 2021

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In this work, a novel approach is demonstrated for 3D-printing of bacterial cellulose (BC) reinforced UV-curable ion gels using two-component solvents based on 1-butyl-3-methylimidazolium chloride or choline chloride combined with acrylic acid. Preservation of cellulose’s crystalline and nanofibrous structure is demonstrated using wide-angle X-ray diffraction (WAXD) and atomic force microscopy (AFM). Rheological measurements reveal that cholinium-based systems, in comparison with imidazolium-based ones, are characterised with lower viscosity at low shear rates and improved stability against phase separation at high shear rates. Grafting of poly(acrylic acid) onto the surfaces of cellulose nanofibers during UV-induced polymerization of acrylic acid results in higher elongation at break for choline chloride-based compositions: 175% in comparison with 94% for imidazolium-based systems as well as enhanced mechanical properties in compression mode. As a result, cholinium-based BC ion gels containing acrylic acid can be considered as more suitable for 3D-printing of objects with improved mechanical properties due to increased dispersion stability and filler/matrix interaction.

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“…Deep eutectic solvents (DES) have been recommended as sustainable solvent systems for biopolymer film plasticization because of their physical-chemical properties and biodegradability [ 14 , 15 ]. They are obtained by complex formation between a hydrogen bond donor (HBD) and a quaternary ammonium salt (hydrogen bond acceptor–HBA) [ 16 ]. These mixtures present many advantages, such as being chemical and thermally stable, non-flammable, and having low volatility, melting point and toxicity, all of which makes DES a good choice for plasticizing food packaging [ 12 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Improved Antioxidant and Mechanical Properties of Food Packaging Films Based on Chitosan/Deep Eutectic Solvent, Containing Açaí-Filled Microcapsules

et al. 2023

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The development of biobased antioxidant active packaging has been valued by the food industry for complying with environmental and food waste concerns. In this work, physicochemical properties for chitosan composite films as a potential active food packaging were investigated. Chitosan films were prepared by solution casting, plasticized with a 1:2 choline chloride: glycerol mixture as a deep eutectic solvent (DES) and incorporated with 0–10% of optimized açaí oil polyelectrolyte complexes (PECs). Scanning electron microscopy and confocal laser scanning microscopy revealed that the chitosan composite films were continuous and contained well-dispersed PECs. The increased PECs content had significant influence on the thickness, water vapor permeability, crystallinity (CrD) and mechanical and dynamic behavior of the films, as well as their antioxidant properties. The tensile strength was reduced in the following order: 11.0 MPa (control film) > 0.74 MPa (5% DES) > 0.63 MPa (5% DES and 5% PECs). Films containing 2% of PECs had an increased CrD, ~6%, and the highest elongation at break, ~104%. Films with 1% of PECs displayed the highest antioxidant properties against the ABTS and DPPH radicals, ~6 and ~17 mg TE g−1, respectively, and highest equivalent polyphenols content (>0.5 mg GAE g−1). Films with 2% of particles were not significantly different. These results suggested that the chitosan films that incorporated 1–2% of microparticles had the best combined mechanical and antioxidant properties as a potential material for food packaging.

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Deep Eutectic Solvents: A New Class of Versatile Liquids

Cited by 24 publications

References 43 publications

Mixed Ionic and Electronic Conducting Eutectogels for 3D‐Printable Wearable Sensors and Bioelectrodes

Mixed Ionic and Electronic Conducting Eutectogels for 3D‐Printable Wearable Sensors and Bioelectrodes

Polymerizable Choline- and Imidazolium-Based Ionic Liquids Reinforced with Bacterial Cellulose for 3D-Printing

Improved Antioxidant and Mechanical Properties of Food Packaging Films Based on Chitosan/Deep Eutectic Solvent, Containing Açaí-Filled Microcapsules

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