BCMaterials, Basque Center for Materials, Applications and Nanostructures, UPV/EHU Science Park, 48940 Leioa, Spain.
BCMaterials, Basque Center for Materials, Applications and Nanostructures, UPV/EHU Science Park, 48940 Leioa, Spain; Department of Graphic Design and Engineering Projects, Faculty of Engineering in Bilbao, University of the Basque Country (UPV/EHU), Bilbao 48013, Spain.
Carbohydr Polym. 2020 Apr 1;233:115855. doi: 10.1016/j.carbpol.2020.115855. Epub 2020 Jan 10.
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. 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) 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.
通常，磁性材料的制备涉及昂贵、不可扩展、耗时或有毒的过程。在这里，我们通过使用具有微米级孔的机械柔性纸张作为基底的丝网印刷，报告了一种可扩展、快速且环保的磁性活性材料的制备方法。与传统的多组分油墨相比，仅使用水溶性纤维素衍生物和钴铁氧体纳米颗粒的简单水性分散体。根据所使用的纤维素基质，在剪切速率为 20-100s 时，可以获得粘度在 500-2500mPa·s 范围内的油墨。制备出线宽为 183-642μm 的图案，最大偏差为 9%。基于羟丙基纤维素的油墨获得的最大磁化饱和值为 0.024 emu（或 0.021 emu·cm），表明具有足够的磁化强度，可用于执行器和传感器等领域。这项工作为使用水作为唯一溶剂的可再生、磁性和机械柔性材料的加工提供了新的见解，这些材料具有定制的几何形状。
