We investigate the three-dimensional (3D) structuring of cellulose nanofiber (CNF) foam-based ink using direct ink writing 3D printing and the transformation of CNF foam from an insulator to a conductor. The colloidal stability of a CNF foam is critical to producing a solid CNF foam which can be used as a template for the synthesis of conducting polymers. Liquid CNF foam ink is produced by simple stirring of CNF suspension with sodium dodecyl sulfate as an emulsifier. The shear thinning behavior of the liquid CNF foam ink enables printing through a needle. Flexible design of CNF foam structures is enabled by 3D printing using computer-aided design. Lightweight conductive CNF foams are prepared via in situ polymerization of polypyrrole on a solid CNF foam. The topological features of the resultant porous conductive CNF foams are observed, and their conductivity is investigated.

我们使用直接墨水书写3D打印技术研究纤维素纳米纤维（CNF）泡沫基墨水的三维（3D）结构，并将CNF泡沫从绝缘体转变为导体。CNF泡沫的胶体稳定性对于生产固体CNF泡沫至关重要，该固体CNF泡沫可用作合成导电聚合物的模板。液态CNF泡沫油墨是通过将CNF悬浮液与十二烷基硫酸钠作为乳化剂进行简单搅拌而生产的。液态CNF泡沫油墨的剪切稀化行为使得可以通过针进行打印。通过使用计算机辅助设计的3D打印，可以实现CNF泡沫结构的灵活设计。通过原位制备轻质导电CNF泡沫在固态CNF泡沫上聚合聚吡咯 观察所得多孔导电CNF泡沫的拓扑特征，并研究其导电性。