Programmable Mechanical Properties of Two-Photon Polymerized Materials: From Nanowires to Bulk
Programmable Mechanical Properties of Two-Photon Polymerized Materials: From Nanowires to Bulk
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DOI：
10.1002/admt.201900146
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发表时间：
2019-09-01
影响因子：
6.8
通讯作者：
Valdevit, Lorenzo
中科院分区：
文献类型：
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作者：
Bauer, Jens;Izard, Anna Guell;Valdevit, Lorenzo
双光子聚合直接激光写入（TPP-DLW）是具有纳米尺度特征的几何复杂零件的增材制造的最有前途的技术，并且可以显著加速各种工程微/纳米系统的发展。然而，TPP-DLW的广泛工业应用的一个主要障碍是缺乏系统的材料性能数据和有限的知识与加工参数的相关性。丙烯酸酯基树脂IP-浸渍的这些相关性是在从纳米到厘米的大范围的工艺参数和长度尺度上通过实验建立的。通用的机械性能和工艺参数之间的特性关系被确定，这使得剪裁的材料强度和刚度超过半个数量级从橡胶软到硬和强。利用本文提出的基于阈值的光学模型，可以准确地捕获双光子聚合材料的机械性能作为所应用的工艺参数的函数，为具有可编程机械性能的双光子聚合的通用定量可预测性奠定了基础。这些知识使得能够制造在其机械性能中具有定制的局部梯度的微尺度组件，这对新型机械、光子和光子超材料的发展具有重要意义。
Two-photon polymerization direct laser writing (TPP-DLW) is the most promising technology for additive manufacturing of geometrically complex parts with nanoscale features, and could dramatically accelerate the development of a wide range of engineering micro/nanosystems. However, a major obstacle to TPP-DLW's widespread industrial adoption is the lack of systematic data on material properties and limited knowledge on their correlation with processing parameters. These correlations for the acrylate-based resin IP-Dip are experimentally established over a large range of process parameters and length scales ranging from nanometers to centimeters. Universal characteristic relations between mechanical properties and process parameters are identified, which enable the tailoring of the material strength and stiffness over half an order of magnitude from rubbery soft to hard and strong. With a threshold-based optics model presented herein, the mechanical properties of the two-photon polymerized material can be accurately captured as a function of the applied process parameters, laying the foundation for a universal quantitative predictability of two-photon polymerization with programmable mechanical properties. This knowledge enables fabrication of microscale components with tailored local gradients in their mechanical properties, with significant implications for the development of novel mechanical, photonic, and photonic metamaterials.