Unlocking the Power of Multicatalytic Synergistic Transformation: toward Environmentally Adaptable Organohydrogel

Abstract

A sustainable and efficient multicatalytic chemical transformation approach is devised for the development of all‐biobased environmentally adaptable polymers and gels with multifunctional properties. The catalytic system, utilizing Lignin aluminum nanoparticles (AlNPs‐Al3+), synergistically combines multiple catalytic cycles to create robust, mechanically stable, and versatile organohydrogels. Single catalytic cycles alone fail to achieve desired results, highlighting the importance of cooperatively combining different cycles for successful outcomes. The transformation involves free radical crosslinking, reversible quinone‐catechol reactions, and an autocatalytic mechanism, resulting in a dual crosslinking strategy that incorporates both covalent and ionic crosslinking. This approach creates a dynamic gel system with combined energy dissipation and storage mechanisms. The engineered organohydrogels demonstrate vital multifunctionalities such as good thermal stability, self‐healing, and adhesive properties, flame‐retardancy, mechanical resilience and durability, conductivity, viscoelastic properties, environmental adaptability, and resistance to extreme conditions such as freezing and drying. The developed catalytic technology and resulting gels hold significant potential for applications in flexible electronics, energy storage, actuators, and sensors.This article is protected by copyright. All rights reserved

Enzyme-Induced “Sea–Island” Structure Reinforced Bio-Based Adhesive: Toward High Bonding Strength, Toughness, and Bacterial Resistance

“…The absorption band at 3370 cm −1 belonged to −OH stretch of SA. 37 Following the complexation of −COOH and −OH with La 3+ to form La@SA and La@TSA microspheres, the peak intensity increased significantly and red-shifted to 3375 and 3376 cm −1 . Tested by Ellman's reagent, the La@TSA contained lower concentrations of -SH groups than TSA, which possibly was because some -SH groups were encapsulated within the microspheres during the formation process (Figure 2c, 2d).…”

“…The structures of La@SA and La@TSA were analyzed by using FT-IR (Figure b). The absorption band at 3370 cm –1 belonged to −OH stretch of SA . Following the complexation of −COOH and −OH with La 3+ to form La@SA and La@TSA microspheres, the peak intensity increased significantly and red-shifted to 3375 and 3376 cm –1 .…”

Latest developments and trends in electronic skin devices

“…Gel-type materials comprise a polymer network and a solution containing a large number of ions and have remarkable flexibility, excellent adhesion to the skin, and strong biocompatibility, making them ideal candidates for the manufacture of sensors and devices that can be attached to the human body or even implanted [89][90][91][92] . Based on the material system of polymer networks + ionic solutions, they can be classified into three main categories: hydrogels, organogels, and organohydrogels [93] [Figure 6A].…”

Self-Repairing Humidity-Adjustable Anisotropic Adhesion Switch for Smart Manipulation

“…Inspired from this, scientists have designed and prepared high-performance adhesive materials by observing, imitating, and learning from biological surfaces. − Most adhesives are usually connected to the target material for the purpose of essentially relying on adhesion regulation at the molecular scale. − Among them, the externally triggered adhesion change behavior of stimulus-responsive materials provides the necessary on-demand controllability for many device applications, such as enabling the selective grab and release of robots, the strong adhesion and easy removal of wearable electronics, and the health monitoring devices. − However, achieving the characteristic-controlled adjustment of adhesion strength and orientation is often challenging for these adhesives, including separation residues or excessive adhesion during separation, which can lead to difficulties in disassembling immediately during practical application. − Therefore, it is of great significance to construct a responsive anisotropic surface that can achieve dynamic and controllable switching of adhesion strength and orientation.…”