College of Energy, Xiamen University, Xiamen 361102, PR China.
State Key Laboratory of Pulp and Paper-making Engineering, South China University of Technology, Guangzhou 510640, PR China.
Carbohydr Polym. 2022 Jan 15;276:118783. doi: 10.1016/j.carbpol.2021.118783. Epub 2021 Oct 23.
Recently, great efforts have been devoted to developing conductive adhesive hydrogels to meet the needs of various applications. However, grand challenges remain in achieving anisotropic hydrogels simultaneously featuring multiple properties using natural polymers and renewable resources. Here, a cellulose-based conductive hydrogel with strong, ultrastretchable, and adhesive properties is prepared via a simple magnetic field-induced strategy. This strategy involves the formation of a suspension mixture with well-oriented cellulose-polydopamine nanocomposites under magnetic fields, followed by rapid orientation via covalent crosslinking. The tensile strength of the oriented hydrogel in longitudinal direction is ~0.22 MPa, which is ~1.4 times higher than that in radial direction. Moreover, the hydrogel shows good cyclic loading-unloading ability, high conductivity (6.9 ± 0.6 S m), and strong adhesion (71 kPa). The hydrogel also shows significant anisotropic properties and made it a versatile platform for wearable sensors to monitor large and subtle human motion in the foreseeable future.
最近，人们致力于开发导电水凝胶以满足各种应用的需求。然而，利用天然聚合物和可再生资源同时实现具有多种性能的各向异性水凝胶仍然面临巨大挑战。在这里，我们通过一种简单的磁场诱导策略制备了具有强韧、超拉伸和粘附性能的纤维素基导电水凝胶。该策略涉及在磁场下形成具有良好取向的纤维素-聚多巴胺纳米复合材料的悬浮混合物，然后通过共价交联快速取向。定向水凝胶在纵向的拉伸强度约为 0.22 MPa，比在径向方向上高约 1.4 倍。此外，该水凝胶还具有良好的循环加载-卸载能力、高导电性（6.9 ± 0.6 S m）和强粘附性（71 kPa）。该水凝胶还表现出显著的各向异性，使其成为可用于监测未来大型和细微人体运动的可穿戴传感器的多功能平台。
