Povidone–iodine enhanced underwater tape

Abstract

Realizing rapid and stable bonding under humid conditions has remained a challenge in adhesion science and wound dressing. In this study, a polyacrylate-based underwater tape with water-enhanced adhesion and antimicrobial...

Fabrication of anti-freezing and self-healing nanocomposite hydrogels based on phytic acid and cellulose nanocrystals for high strain sensing applications

“…The hydroxyl groups in the PVA chain were abundant, and strong hydrogen bonds could be formed with the inside, thereby giving the hydrogel skeleton excellent selfhealing and mechanical properties. [40][41][42] Especially, when CNCsg-PPy was introduced as a crosslinking agent, PVA exhibited better mechanical properties and flexibility because PVA and nanomaterials could produce a series of interactions in hydrogel systems, which were conducive to the preparation of nanocomposite hydrogels with mechanical strength and self-healing properties. [43][44][45] In addition, the electrostatic interactions generated between PDDA and PA could significantly improve the mechanical strength of the hydrogels.…”

Structure and Formation Mechanism of Iodine Complexes of Nylon Model Compounds as Revealed by X-ray Single-Crystal Structure Analysis and Density Functional Theory

“…One of the most typical dopants may be an iodine ion, as seen in the polyacetylene – iodine complex. , In this case, almost fully extended polyacetylene chains are surrounded by the iodine rod ions, and the electrons are transferred from iodine to the polyacetylene chain via the so-called charge-transfer mechanism. − Another popular iodine complex is seen for starch and amylose, in which the long helical chain encloses many iodine rods along the chain axis. − This case is different from the iodine complex of cellulose, in which the extended cellulose chains are coordinated side by side through interactions with the iodine rod ions in the crystal lattice . From a practical viewpoint, the iodine complex of the polymer is useful in industrial applications. − For example, the highly oriented poly­(vinyl alcohol) (PVA) – iodine complex is utilized widely as an optical polarizer. − The detailed structural analysis of the iodine complexes of PVA and related poly­(vinyl acetate) helped reveal the origin of the optical polarizer at the atomic level, as reported in various papers. − …”

Multifunctional, Ultra‐Tough Organohydrogel E‐Skin Reinforced by Hierarchical Goatskin Fibers Skeleton for Energy Harvesting and Self‐Powered Monitoring

“…[35,36] Most importantly, possessing good environmental stability (anti-freezing at low temperatures and long-lasting moisturization) are essential properties for the actual application of conductive hydrogel-based sensor devices. [37][38][39] However, it is a big challenge to acquire conduc-tive hydrogel with simultaneously the above-mentioned multifunctionality. In this work, the skin-based hydrogel, as a reliable substrate with reasonable hierarchical collagen fibers 3D network structure, provides storage space for the loading of functional materials, which makes it possible to realize the hydrogel sensor possessing the above-mentioned versatility.…”

“…The resulting S@HCP exhibited excellent mechanical properties, fatigue resistance, low hysteresis (<5% residual strain), good self-adhesive (up to 13.7 kPa), selfadaptive, transparent (transmittance of 57%), UV-shielding, antimicrobial, biocompatible, antifreezing, and moisturizing properties as well as high conductivity (8.9 S m −1 ) and high sensitivity (up to 10.3 of GF (gauge factor)), which has considerable advantages over hydrogels recently reported in related literature. [32][33][34][35][36][37][38][39][40] Based on these fascinating features, S@HCP could be used as an ideal flexible bioelectrode for the precise acquisition of human electrophysiological signals (e.g., electromyography (EMG) and electrocardiogram (ECG)). Furthermore, the stretchable TENG assembled by using S@HCP (named as S-TENG) as flexible electrode material could be perfectly suited for real-life applications including biomechanical energy harvesting (wearable insoles), self-powered tactile pressure recognition, and human motion monitoring.…”