Multifunctional Glycerol–Water Hydrogel for Biomimetic Human Skin with Resistance Memory Function

Abstract

Biomimetic human skinlike materials with preferably self-healing ability, high sensitivity for external stimuli, and good adhesiveness against diverse substrates under a wide range of temperatures are of great importance in various applications such as wearable devices, human-motion devices, and soft robotics. However, most of the reported biomimetic human skinlike materials lack memory function, i.e., they cannot memorize the external stimuli once the stimuli disappear. This drawback hinders their applications in mimicking the human skin in real world. Here, a polyacrylamide/Au@polydopamine glycerol–water (GW) hydrogel has been designed to address this challenge. The as-prepared GW hydrogel exhibits a fast self-healing efficiency and good adhesiveness against diverse substrates under a wide range of temperatures (from −15 to 37 °C). Additionally, our GW hydrogel also possesses good perceived ability for external stimuli and subtle/large human motions. Most importantly, resistance memory function has been realized based on our GW hydrogel. These outstanding properties make it potentially significant in mimicking the human skin in real world.

Biocompatible and Highly Stretchable PVA/AgNWs Hydrogel Strain Sensors for Human Motion Detection

“…Flexible and stretchable sensors are attracting significant interest in a wide range of applications including health monitoring, diagnostic devices, soft robotics, and electronic skins. [ 1–6 ] Piezoresistive sensors, one of the main types of sensors, change their resistance in response to mechanical deformation and have demonstrated a number of applications in monitoring strain, [ 4–8 ] pressure, [ 6,7,9 ] flow, [ 10–12 ] and temperature. [ 4,13,14 ] To meet the requirements for both human motion detection and biosafety, flexible sensors should be biocompatible.…”

Highly Swellable and Stretchable Thermoresponsive Hydrogels Enabled by Functionalized Boron Nitride Nanosheets

“…[ 24 ] As a result, the P(MAH‐β‐CD‐ co ‐NIPAM)/f‐BNNS hydrogels possessed excellent strength and tensile strain, making it superior to the majority of the reported PNIPAM‐based hydrogels (Figure 5e). [ 2,16–20,32 ] Moreover, the tensile strain of the P(MAH‐β‐CD‐ co ‐NIPAM)/f‐BNNS hydrogel is much higher than those of most nanocomposite hydrogels, which indicated that f‐BNNSs are ideal nanofillers because of strong dynamic interactions between f‐BNNSs and PNIPAM matrix. [ 26 ]…”

“…Recently, several nanofillers have been introduced PNIPAM hydrogels to improve mechanical or swelling properties. [ 2,16–19 ] For example, Xu and co‐workers reported a nanofiller‐reinforced hydrogel by combing biocompatible boron nitride nanosheets (BNNSs), clay, and PNIPAM. With 0.16 wt% BNNSs, the tensile strength of PNIPAM hydrogel was increased from 0.02 to 0.04 MPa, increasing by 100%.…”

One‐Pot Route for Fe@Poly(styrene‐co‐divinylbenzene) Foam with Robust Physical/Chemical Stability and Remote Magnetic Driven Capacity for Oil Removal

“…[47] The bands at 1601 and 1456 cm −1 could be associated with the benzene ring vibration of PSDVB. [45,48,49] The absorption peaks at 667 and 723 cm −1 were Scheme 1. Schematic description of the preparation of Fe@PSDVB and its application.…”