3D Printing of Cantilever-Type Microstructures by Stereolithography of Ferromagnetic Photopolymers
3D Printing of Cantilever-Type Microstructures by Stereolithography of Ferromagnetic Photopolymers
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DOI：
10.1021/acsami.6b08880
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发表时间：
2016-10-05
影响因子：
9.5
通讯作者：
Turri, Stefano
中科院分区：
文献类型：
--
作者：
Credi, Caterina;Fiorese, Alessandro;Turri, Stefano
在目前的工作中，原型的聚合物纳米磁性微结构的制造通过立体光刻（SL）。为此，通过将双官能丙烯酸单体与光引发剂和可见光染料共混来配制适合于高分辨率SL处理的UV固化体系，所述光引发剂和可见光染料的含量被调整以定制树脂SL灵敏度。随后，为了赋予光聚合物铁磁性，实施了两种不同的策略。两步法涉及通过无电镀工艺在光聚合物SL固化表面上选择性沉积金属层。另一方面，SL-加工的铁磁响应纳米复合材料（FRCs），通过直接加载磁铁矿纳米粒子内的光聚合物矩阵。为了实现高印刷分辨率，树脂SL灵敏度作为各种添加剂含量的函数进行了研究。还进行了光致量热分析以研究光聚合物在曝光时的转换效率。高性能配方的特点是减少渗透深度（
In the present work, prototypes of polymeric cantilever-based magnetic microstructures were fabricated by means of stereolithography (SL). To this end, a UV-curable system suitable for high-resolution SL-processing was formulated by blending a bifunctional acrylic monomer with photoinitiator and visible dye whose content was tuned to tailor resin SL sensitivity. Subsequently, to confer ferromagnetic properties to the photopolymer, two different strategies were implemented. A two-step approach involved selective deposition of a metal layer on photopolymer SL-cured surfaces through an electroless plating process. On the other hand, SL-processable ferromagnetically responsive nanocomposites (FRCs) were obtained by directly loading magnetite nanoparticles within the photopolymer matrix. In order to achieve high-printing resolution, resin SL sensitivities were studied as a function of the various additives contents. Photocalorimetric analyses were also performed to investigate the photopolymer conversion efficiency upon light exposure. High-performing formulations were characterized by reduced penetration depth (