Multifunctional self-healing eutectogels induced by supramolecular assembly for smart conductive materials, interface lubrication and dye adsorption

Zwitterionic Eutectogel-Based Wearable Strain Sensor with Superior Stretchability, Self-Healing, Self-Adhesion, and Wide Temperature Tolerance

“…Deep eutectic solvents (DESs), which are composed of hydrogen bond acceptors (HBAs) and hydrogen bond donors (HBDs), are a subgroup of room-temperature ionic liquids (RTILs), also have the advantages of low volatility and ionic conductivity. , Furthermore, DESs usually are nontoxic, low-cost, and environmentally friendly. , Therefore, DES-based eutectogels are preferred alternatives to expensive ionogels and temperature-intolerant hydrogels, having become a research hotspot. , In recent years, eutectogels have shown a promising future in wearable sensors. − The formation of eutectogels is inseparable from the participation of gelators such as polymers, − nanomaterials , and low-molecular-weight gelators. − Polymer-based eutectogels are common for their excellent mechanical properties, processability, and moldability . For instance, Wang et al.…”

Jammed Microgels in Deep Eutectic Solvents as a Green and Low-Cost Ink for 3D Printing of Reliable Auxetic Strain Sensors

“…Deep eutectic solvents (DESs), which are composed of hydrogen-bond donors (HBDs) and hydrogen-bond acceptors (HBAs), possess several physicochemical properties similar to those of ILs (e.g., low melting point, high stability, and sufficient ionic conductivity). Most HBDs and HBAs are low-cost, renewable, and biocompatible compounds, and a simple heating and mixing of them directly yield DESs. − As a result, the development of flexible electronic devices based on DESs has considerably increased recently. − Until now, only few works have adopted DESs as the solvent for 3D printing applications. − Digital light processing (DLP) 3D printing, based on DESs as the solvent, has been developed for flexible electronic applications. , However, in comparison to DIW 3D printing, DLP is highly selective when it comes to material printing, whereas DIW is not limited by material class as long as the precursor ink demonstrates appropriate rheological behavior . To modify the rheological properties of DESs, cellulose nanocrystals (CNCs) , have been utilized as an additive to DESs to form a viscoelastic ink for the DIW 3D printing of wearable sensors.…”

Construction of Poly(hydrophobic deep eutectic solvent)/Ethylcellulose Composite Films for Green Recyclable Tapes

“…Deep eutectic solvents (DESs) consist of hydrogen bond donors and acceptors, which are able to associate through hydrogen bonding interactions to form eutectic mixtures. – The hydrogen bonding between DES components has led to the development of a variety of self-adhesive materials, e.g., Dong et al used natural acids and polysaccharides to produce supramolecular self-adhesive polymers with excellent adhesive strength due to the high hydrogen bonding density. – However, most of the deep eutectic polymers reported so far are hydrophilic and their adhesion, and mechanical properties deteriorate significantly in the presence of water, preventing their widespread use. – To circumvent these disadvantages, in this paper, we focus on hydrophobic DESs, especially those consisting of natural components, which have many advantages that clearly distinguish them from hydrophilic DESs in terms of density, viscosity, acidity, polarity, and volatility. – The current application areas of hydrophobic DESs are mainly involved in extraction, gas adsorption and electrolytes, etc. – Therefore, in this paper, poly­(hydrophobic DESs) derived from thymol (Thy), coumarin (Cou), and ethylene glycol phenyl ether acrylate (EGPEA) were innovatively used as self-adhesive coatings. The composite films were prepared by coating the DES prepolymer solutions onto ethylcellulose (EC) surfaces using a roll-to-roll method, followed by rapid UV photopolymerization.…”