Printing of Hydrophobic Materials in Fumed Silica Nanoparticle Suspension
Printing of Hydrophobic Materials in Fumed Silica Nanoparticle Suspension
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DOI：
10.1021/acsami.9b07433
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发表时间：
2019-08-14
影响因子：
9.5
通讯作者：
Huang, Yong
中科院分区：
文献类型：
--
作者：
Jin, Yifei;Song, Kaidong;Huang, Yong
利用液体疏水性建筑材料自由成型三维（3D）打印功能结构具有重要意义，并广泛应用于软体机器人和微流体等各个领域。特别是，用于制造复杂 3D 结构的屈服应力支撑浴 3D 打印方法已经出现。不幸的是，所报道的支撑浴材料要么是疏水性的，要么是通用性不够，无法印刷各种疏水性材料。本研究的目的是提出一种基于气相二氧化硅纳米粒子的屈服应力悬浮液作为疏水性支撑浴，从而能够以先打印后固化的方式对各种疏水性油墨材料进行 3D 挤出打印。疏水性油墨自由沉积在疏水性气相二氧化硅-矿物油悬浮液中，并在印刷过程中保持其形状；直到整个结构完成后才固化。包括聚二甲基硅氧烷（PDMS）、SU-8树脂和环氧基导电油墨在内的各种疏水性油墨在气相二氧化硅-矿物油浴中打印成复杂的3D结构，然后使用相关的交联机制进行固化，即使在高达90摄氏度的温度下，以证明所提出的打印方法的可行性和多功能性。此外，由于界面张力效应可以忽略不计，沉积的特征可以轻松达到更好的分辨率，例如 PDMS 细丝的 30 μm。
Freeform three-dimensional (3D) printing of functional structures from liquid hydrophobic build materials is of great significance and widely used in various fields such as soft robotics and microfluidics. In particular, a yield-stress support bath-enabled 3D-printing methodology has been emerging to fabricate complex 3D structures. Unfortunately, the reported support bath materials are either hydrophobic or not versatile enough for the printing of a wide range of hydrophobic materials. The objective of this study is to propose a fumed silica nanoparticle-based yield-stress suspension as a hydrophobic support bath to enable 3D extrusion printing of various hydrophobic ink materials in a printing-then-solidification fashion. Hydrophobic ink is freeform-deposited in a hydrophobic fumed silica-mineral oil suspension and maintains its shape during printing; it is not cured until the whole structure is complete. Various hydrophobic inks including poly(dimethylsiloxane) (PDMS), SU-8 resin, and epoxy-based conductive ink are printed into complex 3D structures in the fumed silica-mineral oil bath and then cured using relevant cross linking mechanisms, even at a temperature as high as 90 degrees C, to prove the feasibility and versatility of the proposed printing approach. In addition, the deposited feature can easily reach a much better resolution such as 30 mu m for PDMS filaments due to the negligible interfacial tension effect.