The fabrication of magnetic materials typically involves expensive, non-scalable, time-consuming or toxic processes. Here we report a scalable, quick and environmentally-benign fabrication of magnetically active materials through screen printing using mechanically flexible paper having micron-sized pores as substrates. In comparison with traditional multicomponent inks, simple aqueous dispersions comprising solely water-soluble cellulose derivatives and cobalt ferrite nanoparticles are used. Depending on the cellulosic matrix used, inks with viscosities in the 500-2.500 mPa s range were obtained for shear rates of 20-100 s-1. Patterns with line widths from 183 to 642 μm with a maximum deviation of 9 % were fabricated. The largest magnetization saturation obtained of 0.024 emu (or 0.021 emu cm-2) for the hydroxypropyl cellulose-based ink demonstrates enough magnetization for applications in areas such as actuators and sensors. This work provides novel insights towards the processing of renewable, magnetically active and mechanically flexible materials with tailored geometries which use water as the sole solvent.

中文翻译：

---

磁性活性纤维素衍生物纳米复合材料的水基2D打印。

磁性材料的制造通常涉及昂贵，不可缩放，耗时或有毒的过程。在这里，我们报告了通过丝网印刷，使用具有微米级孔的机械柔性纸作为基材，可扩展，快速且对环境无害的制造方法，该方法可通过丝网印刷来实现。与传统的多组分油墨相比，使用了仅包含水溶性纤维素衍生物和钴铁氧体纳米粒子的简单水分散体。根据所使用的纤维素基质，对于剪切速率为20-100 s-1的油墨，粘度为500-2.500 mPa s。制作了线宽为183至642μm，最大偏差为9％的图案。获得的最大磁化饱和度为0.024 emu（或0。羟丙基纤维素基油墨的021 emu cm-2）表现出足够的磁化强度，可用于执行器和传感器等领域。这项工作为处理可再生的，磁性活性的和机械柔性的材料提供了新颖的见解，这些材料具有定制的几何形状，这些几何形状使用水作为唯一溶剂。