Mechanically Robust, Ultraelastic Hierarchical Foam with Tunable Properties via 3D Printing
Mechanically Robust, Ultraelastic Hierarchical Foam with Tunable Properties via 3D Printing
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DOI：
10.1002/adfm.201800631
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发表时间：
2018-05-24
影响因子：
19
通讯作者：
Advincula, Rigoberto C.
中科院分区：
文献类型：
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作者：
Chen, Qiyi;Cao, Peng-Fei;Advincula, Rigoberto C.
通过3D打印制造具有受控多尺度结构和可调机械/导电性能的机械坚固的超弹性泡沫。分层孔隙率，包括宏观和微观孔，是由直接墨水书写（DIW），酸蚀刻和相转化的组合产生的。DIW中的触变油墨通过简单的一锅法将双纳米颗粒（纳米粘土和二氧化硅纳米颗粒）分散在聚氨酯悬浮液中来配制。由此产生的轻质泡沫具有可定制的机械强度，前所未有的弹性（超过1000次压缩循环）和卓越的鲁棒性（在超过其自身重量20000倍的负载后快速完全恢复）。碳纳米管的表面涂层产生导电弹性泡沫，可以用作具有高灵敏度的压阻传感器。该策略首次实现了具有受控多级3D结构和机械/导电性能的弹性泡沫的3D打印。此外，该简便的油墨制备方法可用于通过3D打印制造具有所需性能的各种材料的泡沫。
A mechanically robust, ultraelastic foam with controlled multiscale architectures and tunable mechanical/conductive performance is fabricated via 3D printing. Hierarchical porosity, including both macro- and microscaled pores, are produced by the combination of direct ink writing (DIW), acid etching, and phase inversion. The thixotropic inks in DIW are formulated by a simple one-pot process to disperse duo nanoparticles (nanoclay and silica nanoparticles) in a polyurethane suspension. The resulting lightweight foam exhibits tailorable mechanical strength, unprecedented elasticity (standing over 1000 compression cycles), and remarkable robustness (rapidly and fully recover after a load more than 20 000 times of its own weight). Surface coating of carbon nanotubes yields a conductive elastic foam that can be used as piezoresistivity sensor with high sensitivity. For the first time, this strategy achieves 3D printing of elastic foam with controlled multilevel 3D structures and mechanical/conductive properties. Moreover, the facile ink preparation method can be utilized to fabricate foams of various materials with desirable performance via 3D printing.