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毛细力辅助飞秒激光直写制备各向异性及多级结构

Fabrication of anisotropic and hierarchical structures using femtosecond laser printing capillary force assisted self-assembly

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摘要

将飞秒激光双光子聚合加工技术和毛细力诱导自组装技术相结合实现了各向异性结构和多级结构的制备。首先,使用飞秒激光双光子加工技术加工出微柱阵列,将微柱置于显影液中显影,然后放置在空气中。在显影液蒸发的过程中,微柱结构单元受到毛细力的作用而弯曲实现自组装。通过控制微柱的高度和直径的不一致性实现了两种各向异性结构制备方法,并成功制备了底层微柱直径分别为2 μm和6 μm双层结构。由于毛细力的大小和微柱高度无关,且同样端部变形量下较高微柱的弹性回复力小于较低微柱的弹性回复力,更易发生弯曲; 直径较大的微柱具有更强的抗弯曲能力,从而引导直径较小的微柱向较大的微柱倾斜,藉此制备了各向异性结构。使用毛细力自组装辅助飞秒激光微纳加工可以实现灵活可控的复杂3D结构的加工,并将在生物医药、化学分析、微流体等领域发挥重要作用。

Abstract

A method for preparation of designable anisotropic and hierarchical structures using femtosecond laser printing and capillary force assisted self-assembly was proposed. First, a periodic micro-pillar arrays template was fabricated by localized femtosecond laser polymerization. The micro-pillars were immersed in developed solution for about 40 min and subsequently exposed in the air. During the evaporation of developed solution, micro-pillars was self-assembled into periodic anisotropic architectures with the assistance of capillary force. Two methods to fabricate anisotropic structures were proposed. One was realized via controlling heights of pillars in a cell, the other was achieved via controlling pillar diameters. Furthermore, double-layer structures with underlayer pillar diameters of 2 μm and 6 μm were fabricated respectively. The results indicate that the capillary force is irrespective to the height of pillars, and the elastic restoring force of the higher pillars is stronger than the lower pillars, thus higher pillars are prone to bend and the pillars with larger diameter are more likely to remain upright. Complex 3D structures can be achieved flexibly by combing femtosecond laser fabrication with capillary force self-assembly technology, which will play essential roles in biomedicine, chemistry and microfluidic engineering.

Newport宣传-MKS新实验室计划
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中图分类号:TN249

DOI:10.3788/ope.20172508.2057

所属栏目:现代应用光学

基金项目:国家自然科学基金资助项目(No.61475149,No.51405464,No.61377006,No.51275502,No.11204250);安徽省自然科学基金资助项目(No.1408085ME104);教育部留学回国人员科研启动基金资助项目; 安徽大学研究生学术创新研究项目

收稿日期:2017-04-11

修改稿日期:2017-04-30

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作者单位    点击查看

苏亚辉:安徽大学 电气工程与自动化学院,安徽 合肥 230601安徽大学 计算智能与信号处理教育部重点实验室,安徽 合肥 230009
范珍珠:安徽大学 电气工程与自动化学院,安徽 合肥 230601
汪超炜:中国科学技术大学 精密机械与精密仪器系,安徽 合肥 230022
胡衍雷:中国科学技术大学 精密机械与精密仪器系,安徽 合肥 230022
吴 东:中国科学技术大学 精密机械与精密仪器系,安徽 合肥 230022

联系人作者:苏亚辉(ustcsyh@ahu.edu.cn)

备注:苏亚辉(1968-),男,安徽凤台人,博士,副教授,硕士生导师,2007年于中国科学技术大学精密仪器与机械获得博士学位,主要研究方向有超快激光微纳米加工技术、计算全息技术、仿生界面设计及制备技术。

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引用该论文

SU Ya-hui,FAN Zhen-zhu,WANG Chao-wei,HU Yan-lei,WU Dong. Fabrication of anisotropic and hierarchical structures using femtosecond laser printing capillary force assisted self-assembly[J]. Optics and Precision Engineering, 2017, 25(8): 2057-2063

苏亚辉,范珍珠,汪超炜,胡衍雷,吴 东. 毛细力辅助飞秒激光直写制备各向异性及多级结构[J]. 光学 精密工程, 2017, 25(8): 2057-2063

被引情况

【1】顾银炜,陈 达,李久荣,董建峰,王 琴,王 刚,陶卫东. 飞秒激光双光子聚合构建水溶性石墨烯-光刻胶的3D微结构. 红外与激光工程, 2018, 47(10): 1006006--1

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