A Degradable-Renewable Ionic Skin Based on Edible Glutinous Rice Gel

Abstract

Traditional wearable devices are commonly nonrecyclable and nondegradable, resulting in energy waste and environmental pollution. Here, a household degradable and renewable ionic skin based on edible glutinous rice gel is developed for a strain, temperature and salivary enzyme activity sensor. This gel depends on intermolecular and intramolecular Hbonds among amylopectin and amylose, and this presents excellent skin-like properties, including stretchability, self-healing property, and adhesion to various substrates. The glutinous rice gel-based skin sensor can be used to monitor vital signs and physiological parameters such as body temperature and heart rate. The sensor also achieves specific speech recognition and detects temperature and body micromovements, which provides the potential to reconstruct language or sensory/motor functions. More importantly, because of the excellent biocompatibility and degradability, the sensor can directly detect the activity of human salivary amylase, which is useful for diagnosing pancreas-, kidney-, and spleen-related diseases in the elderly. Finally, the raw material of ionic skin that originates from traditional grains is degradable and renewable as well as it can be used to prepare household wearable devices. Hence, this work not only extends the application of wearable electronics in daily life but also facilitates health monitoring in the elderly and improves their quality of life.

Preparation of Degradable Antiwaxing Coating and a Novel Method for Quantifying Antiwaxing Property of Coatings

“…After the steaming process, the GR/CS coating can be stable in water, as shown in Figure 2 c. That is because the linear amylose of GR diffuses to the swollen granules to form the continuous phase at high temperatures, the grain of GR can connect tightly, and the coating is stable. 29 After the treatment of the PA solution, the compact structure of the coating is still preserved, as shown in Figure 3 d–f. The GR/CS-PA can be stable in water, and there is no obvious grain left in water, as shown in Figure 2 d. These results show that the steaming process can make the GR/CS dough become a continuous phase, and the introduction of PA cannot destroy the continuous structure.…”

“…After the steaming process, the GR/CS coating can be stable in water, as shown in Figure c. That is because the linear amylose of GR diffuses to the swollen granules to form the continuous phase at high temperatures, the grain of GR can connect tightly, and the coating is stable . After the treatment of the PA solution, the compact structure of the coating is still preserved, as shown in Figure d–f.…”

“…That is because the linear amylose of GR diffuses to the swollen granules to form the continuous phase at high temperatures, the grain of GR can connect tightly, and the coating is stable. 29 After the treatment of the PA solution, the compact structure of the coating is still preserved, as shown in Figure 3d−f. The GR/CS-PA can be stable in water, and there is no obvious grain left in water, as shown in Figure 2d.…”

Cytoskeleton-inspired hydrogel ionotronics for tactile perception and electroluminescent display in complex mechanical environments

“…2A). For comparison, most HIs with single-molecule networks, such as SF/CaCl 2 , 44 chewed gum/NaCl, 49 glutinous rice/NaCl, 50 gluten/NaCl (K 2 CO 3 ), 51 and dopamine (sulfobetaine methacrylate), 52 exhibit a gum-like viscous state. This means that a small tensile load can produce large deformation, which cannot be recovered when the tensile load is removed.…”

Anti-Swelling Zwitterionic Hydrogels as Multi-Modal Underwater Sensors and All-in-One Supercapacitors

“…Soft electronics have attracted tremendous interest for their large application potential in the fields of flexible sensors, − biomedical devices, − electronic skins, − and so on. Among them, gel-based electronics are specifically preferred for their tissue-like structure, good biocompatibility, and considerable toughness. − Although enormous efforts have been paid for developing stretchable and highly sensitive electronics, constructing tough gel-based sensors capable of detecting signals underwater remains a big challenge yet is very crucial for ocean exploration. − Most of the existing flexible sensors are not suitable for an aqueous environment, as a result of the instability of the polymer backbone and uncontrollable spreading of conductive ions/nanoparticles in water, which finally result in the decline of mechanical and electrical performance. − …”