Fully-physically crosslinked silk fibroin/poly(hydroxyethyl acrylamide) hydrogel with high transparency and adhesive properties for wireless sensing and low-temperature strain sensing

Abstract

Fully-physically crosslinked hydrogels with strain sensitivity and anti-freezing properties for wireless sensing and low temperature sensing were prepared.

Low-Temperature Wearable Strain Sensor Based on a Silver Nanowires/Graphene Composite with a Near-Zero Temperature Coefficient of Resistance

“…The GFs of the Ag NWs/G/PDMS strain sensor at −20, 0, and 20 °C were almost identical to that at −40 °C. As demonstrated in Figure c, this high GF outperforms the values of any previously reported strain sensors measured under subzero temperatures. ,− ,− As the strain was in the 24–32 and 32–36% regions, the GFs of our sensor at −40 °C reached 782 and 1912, respectively. When the strain exceeded 36%, the GF increased dramatically to 9156, which was among the highest values of any types of strain sensors ,− ,− ,− ,,,,− ,,,− (Table S1).…”

Facile preparation of a thermosensitive and antibiofouling physically crosslinked hydrogel/powder for wound healing

“…For example, Zhao et al 15 developed a physical double-network hydrogel for treating multidrug-resistant bacterial infection, in which catechol-Fe 3+ and quadrupole hydrogen bonding endow the hydrogel with rapid self-healing, good shape adaptability, and injectability. In our previous studies, a series of fully physically crosslinked hydrogels were prepared, such as an ionic conductive gelatin-based organohydrogel via hydrophobic interchain interaction and strong ionic interaction, 16 a poly(hydroxyethyl acrylamide)/silk fibroin-LiCl (PHEAA/SF-LiCl) hydrogel via hydrogen bonds and chain entanglement crosslinking, 17 and a pectin-Fe 3+ /poly(acrylamide-co-stearyl methacrylate) (P(AAm-co-SMA)) hydrogel via hydrophobic association and ionic coordination bond crosslinking. 18 However, sodium dodecyl sulfate (SDS), Fe 3+ , etc., which are usually used to construct a fully physically crosslinked hydrogel, may cause cytotoxicity and decrease the repair effect of damaged tissue.…”

Antibacterial and UV‐Blocking Bioelectronics Based on Transparent, Adhesive, and Strain‐Sensitive Multifunctional Hydrogel

“…In addition, when hydrogel‐based strain sensors needed to be used at low temperatures, antifreezing property became very important. [ 5 ] Among them, adhesiveness on substrates plays an important role in the realization of wearable devices because it guarantees a precise detection of human movements. Adhesiveness offers reliable and conformal contact with tissues via the multiple noncovalent bonds or intermolecular interactions (hydrogen bonds, hydrophobic associations, and dipole–dipole interactions).…”

“…With the continuous and rapid development of hydrogel-based sensors, more and more studies focus on how to equip hydrogels with multifunctionality to make hydrogel sensors more suitable for practical applications.In the practical applications, the multifunctionality of hydrogel-based sensor is indispensable. Recently, many multifunctional hydrogels [3,13] have already been prepared including antifreezing, [5,17] self-healing property, [11] moisturizing property, [18] and adhesiveness. [19,20] Take our previous research for example, [11] when conductive hydrogels were applied underwater, antiswelling properties must be equipped.…”

“…In the practical applications, the multifunctionality of hydrogel-based sensor is indispensable. Recently, many multifunctional hydrogels [3,13] have already been prepared including antifreezing, [5,17] self-healing property, [11] moisturizing property, [18] and adhesiveness. [19,20] Take our previous research for example, [11] when conductive hydrogels were applied underwater, antiswelling properties must be equipped.…”