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

Ya-hui SU; Zhen-zhu FAN; Chao-wei WANG; Yan-lei HU; Dong WU

doi:10.3788/OPE.20172508.2057

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

Modern Applied Optics | 更新时间：2020-07-07

- Fabrication of anisotropic and hierarchical structures using femtosecond laser printing capillary force assisted self-assembly
- Optics and Precision Engineering Vol. 25, Issue 8, Pages: 2057-2063(2017)
- 作者机构：
  
  1.安徽大学电气工程与自动化学院, 安徽合肥 230601
  2.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
  3.中国科学技术大学精密机械与精密仪器系, 安徽合肥 230022
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20172508.2057
  CLC： TN249
- Received：11 April 2017，
  
  Accepted：30 April 2017，
  
  Published：25 August 2017
- 稿件说明：
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Ya-hui SU, Zhen-zhu FAN, Chao-wei WANG, et al. 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.
DOI：

Ya-hui SU, Zhen-zhu FAN, Chao-wei WANG, et al. 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. DOI： 10.3788/OPE.20172508.2057.

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

m和6

m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

m and 6

m 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.

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references

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