Self-assembled micro-organogels for 3D printing silicone structures.
Self-assembled micro-organogels for 3D printing silicone structures.
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DOI：
10.1126/sciadv.1602800
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发表时间：
2017-05
期刊：
影响因子：
13.6
通讯作者：
Angelini TE
中科院分区：
文献类型：
--
作者：
O'Bryan CS;Bhattacharjee T;Hart S;Kabb CP;Schulze KD;Chilakala I;Sumerlin BS;Sawyer WG;Angelini TE
使用一种新型的油基微凝胶作为支撑介质，实现了液体硅树脂的高精度3D打印。由微凝胶制成的商业产品的广泛流行说明了利用干扰过渡的巨大实用价值；有无数种方法可以使用柔软的固体材料，这些材料在施加应力的微小变化下流化并再次变成固体。传统的微凝胶合成途径产生的材料主要在水性溶剂中膨胀，或者较少在腐蚀性有机溶剂中膨胀，这限制了这些非常有用的材料的使用方式。例如，水微凝胶已被用作三维（3D）生物打印应用的基础，但可用的微凝胶与非极性液体（如油）不相容，限制了它们在油基材料（如硅树脂）的3D打印中的应用。我们提出了一种利用嵌段共聚物自组装使微有机凝胶在矿物油中膨胀的方法。这种微有机凝胶材料的流变特性可以调整，利用干扰过渡，促进其在硅树脂结构3D打印中的使用。我们发现，最小打印特征尺寸可以通过微有机凝胶介质的屈服应力来控制，从而可以制造许多复杂的有机硅结构，包括分支可渗透网络和功能流体泵。
High-precision 3D printing of liquid silicone is achieved using a new oil-based microgel as a support medium. The widespread prevalence of commercial products made from microgels illustrates the immense practical value of harnessing the jamming transition; there are countless ways to use soft, solid materials that fluidize and become solid again with small variations in applied stress. The traditional routes of microgel synthesis produce materials that predominantly swell in aqueous solvents or, less often, in aggressive organic solvents, constraining ways that these exceptionally useful materials can be used. For example, aqueous microgels have been used as the foundation of three-dimensional (3D) bioprinting applications, yet the incompatibility of available microgels with nonpolar liquids, such as oils, limits their use in 3D printing with oil-based materials, such as silicone. We present a method to make micro-organogels swollen in mineral oil, using block copolymer self-assembly. The rheological properties of this micro-organogel material can be tuned, leveraging the jamming transition to facilitate its use in 3D printing of silicone structures. We find that the minimum printed feature size can be controlled by the yield stress of the micro-organogel medium, enabling the fabrication of numerous complex silicone structures, including branched perfusable networks and functional fluid pumps.