Ho Jin Yao, Fazle Rabbi Kazi, Khodakarami Siavash, Yan Xiao, Li Longnan, Wong Teck Neng, Leong K C, Miljkovic Nenad
Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States.
Singapore Centre for 3D Printing, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Republic of Singapore.
Nano Lett. 2022 Apr 13;22(7):2650-2659. doi: 10.1021/acs.nanolett.1c04463. Epub 2022 Mar 4.
Novel processing phenomena coupled with various alloying materials used in metal additive manufacturing (AM) have opened opportunities for the development of previously unexplored micro-/nanostructures. A rationally devised structure nanofabrication strategy of AM surfaces that can tailor the interface morphology and chemistry has the potential for many applications. Here, through an understanding of grain formation mechanisms during AM, we develop a facile method for tuning micro-/nanostructures of one of the most used AM alloys and rationally optimize the morphology for applications requiring low surface adhesion. We demonstrate that optimized AM structures reduce the adhesion of impaling water droplets and significantly delay icing time. The structure can also be altered and optimized for antiflooding jumping-droplet condensation that exhibits significant enhancement in heat transfer performance in comparison to nanostructures formed on conventional Al alloys. In addition to demonstrating the potential of functionalized AM surfaces, this work also provides guidelines for surface-structuring optimization applicable to other AM metals.
新型加工现象与金属增材制造（AM）中使用的各种合金材料相结合，为开发以前未探索过的微/纳米结构创造了机会。一种合理设计的AM表面结构纳米制造策略，能够调整界面形态和化学性质，具有诸多应用潜力。在此，通过了解AM过程中的晶粒形成机制，我们开发了一种简便方法来调整最常用的AM合金之一的微/纳米结构，并合理优化其形态以用于需要低表面附着力的应用。我们证明，优化后的AM结构可降低刺入水滴的附着力，并显著延迟结冰时间。该结构还可针对防溢跳滴冷凝进行改变和优化，与传统铝合金上形成的纳米结构相比，其传热性能有显著提高。除了展示功能化AM表面的潜力外，这项工作还为适用于其他AM金属的表面结构优化提供了指导方针。
