3D Printable, ultra-stretchable, Self-healable, and self-adhesive dual cross-linked nanocomposite ionogels as ultra-durable strain sensors for motion detection and wearable human-machine interface

Poly(N,N-dimethyl)acrylamide-based ion-conductive gel with transparency, self-adhesion and rapid self-healing properties for human motion detection

“…The self-healing mechanism of the ion-conductive gel may be due to the dynamic ion–dipole interaction formed between the CO in DMA and the cation [BMIM] in the ionic liquid and the formation of dynamic hydrogen bonding between –CF 3 and the anion [Tf 2 N]. 36,63…”

“…The prepared strain sensor has the advantages of fast response, high sensitivity and good reproducibility and can be used for human activity detection. Recently, Zhao et al 36 prepared a novel 3D printable nanocomposite chemically cross-linked ion gel by in situ photopolymerization of acrylic acid in imidazole-based ionic liquid [EMIM][(EtO 2 )PO 2 ]. The special double-crosslinked structure endows it with ultrahigh tensile properties (≈7000%), self-healing, self-adhesive and superior wide temperature resistance.…”

Biomimetic Chromotropic Photonic‐Ionic Skin with Robust Resilience, Adhesion, and Stability

“…Sensitivity is a considerable indicator to evaluate sensing performance and is usually quantified by Gauge Factor (GF), which is calculated to be ≈2.31 in the strain range of 0%-80% (Figure 5j), suggesting a better performance compared with recently reported ionogel-based I-skins (Figure S12, Supporting Information). [14][15][16]26,38,42,[44][45][46][47][48][49] This high sensitivity can be attributed to the high content of [EMIM][DCA] and the compatibility between polymer network and IL, which results in excellent electrical conductivity and mechanical properties. The PI-skin with a fast response time (≈270 ms) and recovery time (≈250 ms) can detect strain at different frequencies and output electrical signals independent of frequency (Figure 4c,d), which further proves the reliability and practicability.…”

Dual Thermo-Responsive and Strain-Responsive Ionogels for Smart Windows and Temperature/Motion Monitoring

“…To overcome the disadvantage of hydrogels, ionogel materials based on ionic liquid (IL) have been developed recently, owing to the unique properties of IL, such as nonvolatility, a wide liquid temperature range, strong dissolving capacity, and excellent thermal stability. − Importantly, the ionogels have the advantages of a good ionic conductivity and wide electrochemical window from IL that other gels do not have, which can be used in some important fields, including energy storage and strain sensors. − However, some methods for preparing ionogel are not in situ, and the preparation process is too complicated (two steps or three steps), and lots of the stretchable ionogels need variety of monomers and cross-linkers, which greatly limits the development and application of the ionogels as strain sensors . On the other hand, the good designability of the anion–cation couple structure of the ILs makes the ionogel show tunable hydrophobicity and hydrophilicity with different polymers. − The obtained high performance stimuli-responsive ionogels with outstanding designability and tunable thermo-responsive behaviors can be applied in a wider field. − However, the reported thermo-responsive ionogels need complex monomers or a complex preparation process, especially when the strain is less than 300%.…”