State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China.
School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Lab Chip. 2021 Dec 21;22(1):148-155. doi: 10.1039/d1lc00807b.
3D microparticles have promising applications in self-assembly, biomedical engineering, mechanical engineering, The shape of microparticles plays a significant role in their functionalities. Although numerous investigations have been conducted to tailor the shape of microparticles, the diversity is still limited, and it remains a challenge to fabricate 3D microparticles with sharp edges. Here, we present a facile approach that combines a folded PDMS channel and orthogonal projection lithography for shaping sharp-edged 3D microparticles. By adjusting the number and the length of channel sides, both regular and irregular polyhedral cross-sections of the folded channel can be obtained. UV light with diverse patterns is applied vertically as the second shape controlling factor. A variety of 3D microparticles are obtained with sharp edges, which are potential templates for micromachining tools and abrasives. Some sharp-edged microparticles are assembled into 2D and 3D mesoscale structures, which demonstrates their prospective applications in self-assembly, tissue engineering,
3D 微球在自组装、生物医学工程、机械工程等领域具有广阔的应用前景。微球的形状在其功能中起着重要作用。尽管已经进行了大量的研究来调整微球的形状，但多样性仍然有限，制造具有锐利边缘的 3D 微球仍然是一个挑战。在这里，我们提出了一种简单的方法，结合折叠 PDMS 通道和正交投影光刻来形成具有锐利边缘的 3D 微球。通过调整通道侧面的数量和长度，可以获得规则和不规则的多面体横截面。具有不同图案的紫外光作为第二个形状控制因素垂直照射。获得了具有锐利边缘的各种 3D 微球，它们是微加工工具和磨料的潜在模板。一些具有锐利边缘的微球被组装成 2D 和 3D 介观结构，这表明它们在自组装、组织工程等领域具有潜在的应用前景。
