Ionic liquid–based click-ionogels

Abstract

Gels that are freeze-resistant and heat-resistant and have high ultimate tensile strength are desirable in practical applications owing to their potential in designing flexible energy storage devices, actuators, and sensors. Here, a simple method for fabricating ionic liquid (IL)–based click-ionogels using thiol-ene click chemistry under mild condition is reported. These click-ionogels continue to exhibit excellent mechanical properties and resilience after 10,000 fatigue cycles. Moreover, due to several unique properties of ILs, these click-ionogels exhibit high ionic conductivity, transparency, and nonflammability performance over a wide temperature range (−75° to 340°C). Click-ionogel–based triboelectric nanogenerators exhibit excellent mechanical, freeze-thaw, and heat stability. These promising features of click-ionogels will promote innovative applications in flexible and safe device design.

A Dynamic Gel with Reversible and Tunable Topological Networks and Performances

“…At H 2 O levels greater than 10 wt %, such as 16 wt %, the protons undergo a significant upfield shift ( Figure 2B), which is attributed to the formation of H bonds between H 2 O molecules and ions. 18,20,21 Strongly polar O-H in H 2 O is inclined to cause the lone pair of electrons of N (nitrogen in the imidazole ring) to be biased toward H of H 2 O, thereby forming the H bond (in the form of hydrated ions). This process leads to the increase in electron cloud density of protons in the imidazole ring and the chemical shift moving upfield.…”

High-performance double-network ionogels enabled by electrostatic interaction

“…Recently, Kim et al 38 reported an ionic mechanoreceptor skin which composed of hydrogen-bonded [EMIM][TFSI] ion pairs on the surface of silica microstructures embedded into thermoplastic polyurethane elastomeric matrix, exhibiting a higher fraction strain of 800%, but the ionic conductivity of the ionogel (0.007 S m À1 ) is much lower than that of our ionogel. Yan et al 39 further reported an ionogel with high ultimate tensile strain of 1390% and ionic conductivity of about 0.8 S m À1 at 25 C by a simple method using thiol-ene click chemistry under mild condition. Overall, our PAMPS-based DN ionogel exhibits outstanding ionic conductivity while maintaining relatively good mechanical strength.…”

Bioinspired Self‐Healing Human–Machine Interactive Touch Pad with Pressure‐Sensitive Adhesiveness on Targeted Substrates

“…However, the nature of covalently cross-linked PAAm hydrogel makes the absence of self-healing in this touch pad. Recently, transparent and conductive ionogels comprised of ionic liquids and polymers have been used as ionoskins to sense touch position, [22] force, [23] and monitor human movements, [24] with the biggest merit of no volatilization. [24] However, due to the absence of functional groups for bonding, these ionogels are nonadhesive, therefore, there is a need to be fixed on target surfaces with the help of tapes or glues.…”