Ionic conductive hydroxypropyl methyl cellulose reinforced hydrogels with extreme stretchability, self-adhesion and anti-freezing ability for highly sensitive skin-like sensors

A highly tough, fatigue-resistant, low hysteresis hybrid hydrogel with a hierarchical cross-linked structure for wearable strain sensors

“…2a. The stretching vibrational peak belonging to the C]C at 1610 cm −1 of AM disappeared aer polymerization, 29 while the characteristic stretching vibration peak belonging to C-OH and the antisymmetric stretching vibration peak corresponding to the C-O-C of HA appeared at 1042 cm −1 and 1118 cm −1 respectively, indicating that the PAM-HA hydrogel was successfully synthesized. Moreover, the absorption of the C]O stretching vibration band at 1652 cm −1 in the PAM hydrogel shied to 1648 cm −1 in the PAM-HA hydrogel, demonstrating that there were strong hydrogen bonds between PAM chains and HA chains.…”

Skin-like hydrogels: design strategy and mechanism, properties, and sensing applications

“…153 At present, zinc chloride, calcium chloride and lithium chloride are being used as ionic substances to introduce freezing resistance for skin-like hydrogels. 67,153,158 The presence of these different ions can inhibit the ice crystallization of hydrogel components and give hydrogel freezing resistance. At the same time, ions can regulate the interaction between the crosslinking network to improve the toughness of skin-like hydrogels, so that the skin-like hydrogel has good tensile and fatigue resistance, showing that it has good sensing ability at low temperature (Fig.…”

pH‐Responsive and Recyclable Hydrogels for Gas Releasing and Scavenging

“…[31] It has also been shown that the addition of ionic compounds can further tune the properties of hydrogel systems that utilize acrylamide. [32][33][34] However, attempts to recycle these hydrophobic-interaction-based hydrogels have been rarely reported, despite the reversible nature of hydrophobic interactions. This may be attributed to the difficulties in developing external stimuli to disassemble the hydrogels and reform the hydrophobic interactions in newly formed materials.…”