From microcircuits to metamaterials, the micropatterning of surfaces adds valuable functionality. For nonplanar surfaces, incompatibility with conventional microlithography requires the transfer of originally planar micropatterns onto those surfaces; however, existing approaches accommodate only limited curvatures. A microtransfer approach was developed using reflowable materials that transform between solid and liquid on demand, freely stretching to yield transfers that naturally conform down to nanoscale radii of curvature and arbitrarily complex topographies. Such reflow transfer helps generalize microprinting, extending the reach of precision planar microlithography to highly nonplanar substrates and microstructures. With gentle water-based processing, reflow transfer can be applied to a range of materials, with microprinting demonstrated onto metal, plastic, paper, glass, polystyrene, semiconductor, elastomer, hydrogel, and multiple biological surfaces.

中文翻译：

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共形三维缩微印刷的回流转印

从微电路到超材料，表面的微图案化增加了有价值的功能。对于非平面表面，与传统的微光刻不兼容，需要将原本平面的微图案转移到这些表面上；然而，现有方法只能适应有限的曲率。使用可按需在固体和液体之间转换的可回流材料开发了一种微转移方法，可自由拉伸以产生自然符合纳米级曲率半径和任意复杂地形的转移。这种回流转移有助于推广缩微印刷，将精密平面微光刻的范围扩展到高度非平面的基板和微结构。通过温和的水基处理，回流转印可应用于多种材料，