Controllable Physical Synergized Triboelectricity, Shape Memory, Self‐Healing, and Optical Sensing with Rollable Form Factor by Zn cluster

Abstract

To build devices offering users comfortable experience, it is important to focus on form factor and multifunctionality. In this study, for the first time, multifunctional Zn clusters with shape memory, self‐healing, triboelectricity, and optical sensing synergized with rollable form factor are designed and fabricated by coordinating COO− and Zn2+. As pore forming agent, Zn clusters produce hierarchical porous structure depending on Zn amount. Zn clusters are applied as message transmitters and charge containers in optical sensing and corona charge injection, respectively. Moreover, Zn clusters in PVB‐COO‐Zn serve as positive tribomaterial due to Zn ion doping effect, increasing the output performance as the Zn amount reaches 20 wt%. In addition, injecting positive charge into PVB‐COO‐Zn 20 lead to more than 24 times increase in output performance compared to those of non‐porous structures. The reversibility of Zn clusters endows shape memory and self‐healing, synergized with the rollable form factor. The rollability is implemented using the long alkyl chain and the energy absorption of porous structure, providing damage resistance. The advancements in this work provide opportunities for multifunctional and unique applications (shape memory rotating‐triboelectric nanogenerator, rollable self‐healing touchpad, hidden tag) synergized with rollability that accomplishes working in broadened condition in near future.

Hydrogel-Transformable Antioxidant Poly-γ-Glutamic Acid/Polyethyleneimine Hemostatic Powder for Efficient Wound Hemostasis

“…Moreover, equipped with diverse functional groups, certain hydrogels can establish covalent or non-covalent bonds with tissue surfaces, becoming one of the most promising candidates for medical wound dressings [13][14][15][16]. In recent years, the hemostatic properties of hydrogels have been extensively studied [17][18][19][20]. For example, Tang and co-workers prepared hemostatic hydrogels based on carboxymethyl chitosan, 2,3,4-trihydroxybenzaldehyde, peptidyl repressing enzyme, and 4-arm poly (ethylene glycol) aldehyde, which showed a promising future for the clinical treatment of full-thickness wounds [21].…”

“…Gels 2024, 10, 68 2 of 14 Hemostatic powder can not only provide a moist environment for wound healing but also form a protective barrier with blood at the wound interface. The hemostatic powder absorbs large amounts of water and tends to produce repeated hydration, drawing moisture from the tissue into the dressing when in contact with tissue [19]. Meanwhile, the excess water on the surface of the hemostatic powder material can be used as a lubricant to reduce tissue adhesion.…”