Additive manufacturing of high aspect-ratio structures with self-focusing photopolymerization  

作　　者：Mingyu Yang Kavin Kowsari Nia O.Myrie Daniela Espinosa-Hoyos Anna Jagielska Seok Kim Nicholas X.Fang Krystyn J.Van Vliet 

机构地区：[1]Harvard-MIT Health Sciences and Technology,Massachusetts Institute of Technology,Cambridge,MA,02139,United States [2]Department of Mechanical Engineering,Massachusetts Institute of Technology,Cambridge,MA,02139,United States [3]Department of Radiology,Brigham and Women’s Hospital,Harvard Medical School,Boston,MA,02115,United States [4]Department of Biological Engineering,Massachusetts Institute of Technology,Cambridge,MA,02139,United States [5]Walter H.Coulter Department of Biomedical Engineering,Georgia Institute of Technology and Emory University School of Medicine,Atlanta,GA,30332,United States [6]Department of Chemical Engineering,Massachusetts Institute of Technology,Cambridge,MA,02139,United States [7]Department of Materials Science&Engineering,Massachusetts Institute of Technology,Cambridge,MA,02139,United States [8]Department of Mechanical Engineering,Changwon National University,Changwon,51140,South Korea

出　　处：《Light(Advanced Manufacturing)》2022年第3期120-149,共30页光（先进制造）（英文）

基　　金：M.Y.acknowledges the Angela Leong Fellowship Fund 2021-2022 from the Massachusetts Institute of Technology.K.K.acknowledges the financial support of the Natural Sciences and Engineering Research Council of Canada(award no.PDF-529703-2019);S.K.acknowledges the National Research Foundation of Korea(NRF)grant funded by the Korean government(MSIT)(No.2019R1A5A8083201 and 2022R1C1C1003966)。

摘　　要：Photocrosslinkable polymers have been exploited to attain impressive advantages in printing freestanding,micrometer-scale,mechanically compliant features.However,a more integrated understanding of both the polymer photochemistry and the microfabrication processes could enable new strategic design avenues,unlocking far-reaching applications of the light-based modality of additive manufacturing.One promising approach for achieving high-aspect-ratio structures is to leverage the phenomenon of light self-trapping during the photopolymerization process.In this review,we discuss the design of materials that facilitate this optical behavior,the computational modeling and practical processing considerations to achieve high aspect-ratio structures,and the range of applications that can benefit from architectures fabricated using light self-trapping-especially those demanding free-standing structures and materials of stiffnesses relevant in biological applications.Coupled interactions exist among material attributes,including polymer composition,and processing parameters such as light intensity.We identify strong opportunities for predictive design of both the material and the process.Overall,this perspective describes the wide range of existing polymers and additive manufacturing approaches,and highlights various future directions to enable constructs with new complexities and functionalities through the development of next-generation photocrosslinkable materials and micromanufacturing methods.

关 键 词：Additive manufacturing Optical waveguide High aspect-ratio Biocompatible structures Polymer photochemistry 

分 类 号：O63[理学—高分子化学]