Page 25 - MSAM-2-2

Materials Science in

Additive Manufacturing

ORIGINAL RESEARCH ARTICLE
Water flow tuned by micro/nano hierarchical

structures fabricated through two-photon
polymerization

Weilong Cao , Wenhui Yu *, Zhen Xiao , Wuhong Xin , Yongling Wu ,
1
1
3
1
2
1
Hongyu Zheng *
1 Department of Mechanical Manufacturing, School of Mechanical Engineering, Shandong University
of Technology, 255000, Zibo, Shandong, P.R. China
2 Department of Vehicle Engineering, School of Transportation and Vehicle Engineering, Shandong
University of Technology, 255000, Zibo, Shandong, P.R. China
3 Analytical Testing Center, Shandong University of Technology, 255000, Zibo, Shandong, P.R. China

Abstract

Two-photon polymerization (TPP) is a sub-classification of vat photopolymerization.
It has been widely used to fabricate micro/nano hierarchical structures that have the
potential to be used to tune the fluid flow in chips. The present work first studied the
influence of laser power on the feature size of TPP-fabricated 2D structures. It was found
that the increase of laser power from 1.0 μW to 1.4 μW leads to the feature size increasing
from 203 nm to 307 nm. Then, the effect of scanning parameters on the accuracy and
surface quality of 3D structures was investigated. The arrangement of the voxels at
*Corresponding authors: different scanning strategies explains the mechanisms of the variation of accuracy
Wenhui Yu and surface roughness. Finally, the pinecone structures with micro/nano hierarchical
(yuwenhui@sdut.edu.cn)
Hongyu Zheng features were built and evaluated for their water repellence. The increase in the number
(zhenghongyu@sdut.edu.cn) of rows of pinecone structures significantly enhances the water-repellent performance.
Citation: Cao W, Yu W, Xiao Z,
et al., 2023, Water flow tuned by Keywords: Femtosecond laser; Two-photon polymerization; Pinecone structure;
micro/nano hierarchical structures
fabricated through two-photon Water repellence
polymerization. Mater Sci Add
Manuf, 2(2): 0879.
https://doi.org/10.36922/msam.0879
Received: April 28, 2023 1. Introduction
Accepted: May 24, 2023 Microfluidic technology has been developed rapidly over the recent decades. It has
Published Online: June 9, 2023 found wide applications in various research fields, including chemical synthesis [1,2] ,
proteomics [3,4] , single-cell analysis [5,6] , tissue engineering [7,8] , high-throughput screening ,
[9]
Copyright: © 2023 Author(s).
[10]
This is an Open Access article environmental analysis , and medical diagnostics [7,11,12] . Microfabrication technologies
distributed under the terms of the that allow the manufacturing of three-dimensional (3D) structures of micro/nanoscale
Creative Commons Attribution have been developed due to the higher requirements for the miniaturization and
License, permitting distribution,
and reproduction in any medium, integration of the structures. Two-photon polymerization (TPP), a sub-classification of
provided the original work is vat photopolymerization, offers great potential for rapid prototyping of 3D nanoscale
properly cited. structures. It has been well employed in the fabrication of various microfluid devices.
Publisher’s Note: AccScience For example, a suspended microfilter was integrated into a 3D-printed microchannel
Publishing remains neutral with fabricated by a standard stereolithography printer . The microfluidic filtration system
[13]
regard to jurisdictional claims in 2
published maps and institutional with a final mesh pores size of 4 μm on a considerable area of 0.5 mm was designed.
affiliations. Organ-on-chip device, whose main components are microfluidic channels and porous

Volume 2 Issue 2 (2023) 1 https://doi.org/10.36922/msam.0879