Abstract A novel method to design and manufacture hierarchically porous materials is proposed by combining Selective Laser Sintering (SLS) with particulate leaching technique. Hierarchically structural porous nylon is prepared and pore forming mechanism is discussed. Experimental results show that the porous materials contain the pores caused by the dissolution of the pore-forming agent in water and the pores existing inherently in SLS parts, which can be further divided into intraformational pores and interlaminar pores. The interactions of these pores with different shapes eventually form hierarchically porous nylon with high connectivity and controllable porosity. The influences of processing parameters and content of pore-forming agent on the porosity and water permeability have been studied. Porous nylon filter integrated with complicated structure is designed and directly fabricated by SLS. The fluid infiltration volume is tested and compared with commercially available water purifiers. The results of filtration experiment show that the filtering precision is about 17.6 μm and the rejection is up to 95% for the suspension containing particles with the size range of 15 μm–120 μm.

中文翻译：

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选择性激光烧结制备的分层多孔材料

摘要 提出了一种将选择性激光烧结（SLS）与颗粒浸出技术相结合的分层多孔材料设计和制造的新方法。制备了分层结构的多孔尼龙并讨论了成孔机理。实验结果表明，多孔材料含有成孔剂在水中溶解形成的孔隙和SLS部分固有的孔隙，可进一步分为层内孔隙和层间孔隙。这些不同形状的孔隙相互作用，最终形成具有高连通性和可控孔隙率的分级多孔尼龙。研究了工艺参数和成孔剂含量对孔隙率和透水性的影响。结构复杂的多孔尼龙过滤器由SLS设计并直接制造。测试流体渗透量并与市售的净水器进行比较。过滤实验结果表明，过滤精度约为17.6 μm，对含有粒径范围为15 μm～120 μm的悬浮液，过滤精度可达95%。