Acoustic Field-Assisted Two-Photon Polymerization Process
Acoustic Field-Assisted Two-Photon Polymerization Process
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DOI：
10.1115/1.4050759
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发表时间：
2021-04
影响因子：
4
通讯作者：
K. Lichade;Yayue Pan
中科院分区：
文献类型：
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作者：
K. Lichade;Yayue Pan
本研究成功地将声学图案化与双光子聚合（TPP）工艺相结合，用于印刷具有空间变化的纳米颗粒组合物的纳米颗粒-聚合物复合微结构。目前，TPP工艺在直接制造复杂三维（3D）微结构方面越来越受到工程界的关注。然而，TPP制造的微结构的全部潜力受到所用材料的限制。本研究旨在创建和演示一种新型的声场辅助TPP（A-TPP）工艺，该工艺可以在液滴中瞬时图案化和组装纳米颗粒，并制备具有空间控制的颗粒-聚合物材料组成的各向异性纳米颗粒-聚合物复合材料。有人发现，在整合声学粒子图案化与TPP过程中的最大挑战是，纳米粒子移动激光照射时，由于光热效应，因此，在光聚合过程中的声学组件是扭曲的。为了通过具有所需纳米颗粒图案的TPP固化树脂中纳米颗粒的声学组装，需要仔细调节激光功率，使得其足以固化，同时足够低以防止光热效应。为了解决这一挑战，本研究调查了阈值激光功率的聚合TPP树脂（Pthr）和光热不稳定性的纳米粒子（Pthp）。图案化的纳米粒子-聚合物复合微结构的制造使用新的A-TPP过程。实验结果验证了所开发的声场辅助TPP工艺在印刷具有空间控制的材料成分的各向异性复合材料上的可行性。
This study successfully integrates acoustic patterning with the Two-Photon Polymerization (TPP) process for printing nanoparticle–polymer composite microstructures with spatially varied nanoparticle compositions. Currently, the TPP process is gaining increasing attention within the engineering community for the direct manufacturing of complex three-dimensional (3D) microstructures. Yet the full potential of TPP manufactured microstructures is limited by the materials used. This study aims to create and demonstrate a novel acoustic field-assisted TPP (A-TPP) process, which can instantaneously pattern and assemble nanoparticles in a liquid droplet, and fabricate anisotropic nanoparticle–polymer composites with spatially controlled particle–polymer material compositions. It was found that the biggest challenge in integrating acoustic particle patterning with the TPP process is that nanoparticles move upon laser irradiation due to the photothermal effect, and hence, the acoustic assembly is distorted during the photopolymerization process. To cure acoustic assembly of nanoparticles in the resin through TPP with the desired nanoparticle patterns, the laser power needs to be carefully tuned so that it is adequate for curing while low enough to prevent the photothermal effect. To address this challenge, this study investigated the threshold laser power for polymerization of TPP resin (Pthr) and photothermal instability of the nanoparticle (Pthp). Patterned nanoparticle–polymer composite microstructures were fabricated using the novel A-TPP process. Experimental results validated the feasibility of the developed acoustic field-assisted TPP process on printing anisotropic composites with spatially controlled material compositions.