Abstract：
Elastic electromagnetic fibers are promising building blocks for next-generation flexible electronics. However, fabrication of elastic fibers is still difficult and usually requires organic solvents or high temperatures, restricting their widespread applications. Furthermore, the continuous production of electromagnetic fibers has not been realized previously. In this study, we propose an ionic chelation strategy to continuously produce electromagnetic fibers with a magnetic liquid metal (MLM) as the core and elastic polyurethane as the sheath in water at room temperature. Sodium alginate (SA) has been introduced to rapidly chelate with calcium ions (Ca2+) in a coagulation bath to support the continuous spinning of waterborne polyurethane (WPU) as a sheath. Meanwhile, WPU-encapsulated MLM microparticles efficiently suppress the fluid instability of MLM for continuous extrusion as the core. The resultant fiber exhibits excellent mechanical performances (tensile strength and toughness up to 32 MPa and 124 MJ/m3, respectively), high conductive stability in large deformations (high conductivity of 7.6 × 104 S/m at 580% strain), and magnetoactive properties. The applications of this electromagnetic fiber have been demonstrated by conductance-stable wires, sensors, actuation, and electromagnetic interference shielding. This work offers a water-based molecular principle for efficient and green fabrication of multifunctional fibers and will inspire a series of applications.
摘要：
弹性电磁纤维是下一代柔性电子产品的有希望的构建块。然而,弹性纤维的制造仍然很困难，通常需要有机溶剂或高温，限制了其广泛应用。此外，电磁纤维的连续生产以前还没有实现。在这项研究中,我们提出了一种离子螯合策略，以在室温下在水中连续生产以磁性液态金属（MLM）为芯，以弹性聚氨酯为鞘的电磁纤维。已引入海藻酸钠（SA）在凝固浴中与钙离子（Ca2）快速螯合，以支持水性聚氨酯（WPU）作为鞘的连续纺丝。同时,WPU包封的MLM微粒有效地抑制了MLM作为核心的连续挤出的流体不稳定性。所得纤维表现出优异的机械性能（拉伸强度和韧性分别高达32MPa和124MJ/m3），在大变形中具有高导电稳定性（在580％应变时为7.6×104S/m的高导电率），和磁活性特性。这种电磁纤维的应用已经证明了电导稳定的电线，传感器,致动,和电磁干扰屏蔽。这项工作为多功能纤维的高效和绿色制造提供了水基分子原理，并将激发一系列应用。
