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Related Experiment Video

Updated: Aug 16, 2025

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A Power Compensation Strategy for Achieving Homogeneous Microstructures for 4D Printing Shape-Adaptive PNIPAM

Liyuan Tan1, Hyunjin Lee2, Li Fang2

  • 1School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA.

Gels (Basel, Switzerland)
|December 22, 2022
PubMed
Summary

This study introduces a laser power compensation strategy to create uniform, high-aspect-ratio microscale hydrogel structures. This 4D printing advancement enables homogeneous, shape-adaptive hydrogels for advanced applications.

Keywords:
4D printingPNIPAMdeformationhomogeneoushydrogelpolymerization

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Area of Science:

  • Materials Science
  • Microfabrication
  • Polymer Chemistry

Background:

  • 3D printing with smart materials, including hydrogels, enables 4D printing for applications like microrobots and tissue engineering.
  • Microscale 3D printing faces challenges with laser power absorption and light spot aberrations, causing polymerization decay along the height, hindering structure quality.
  • Existing solutions for homogeneous microscale 3D printing, especially for high aspect ratio structures, remain unreported.

Purpose of the Study:

  • To propose and experimentally validate a laser power compensation strategy for fabricating homogeneous, high aspect ratio microscale hydrogel structures.
  • To address the issue of polymerization degree decay along the out-of-plane direction in microscale 3D printing.
  • To investigate the material property saturation in 4D-printed hydrogels.

Main Methods:

  • Utilizing linear approximations of power decay curves for height steps in two-photon polymerization.
  • Experimental fabrication of hydrogel structures with the proposed compensation strategy.
  • Characterization of printed microstructures to verify homogeneity and an indirect 3D deformation method to investigate material property saturation.

Main Results:

  • Successful fabrication of homogeneous and high aspect ratio microscale hydrogel structures using the proposed laser power compensation strategy.
  • Experimental verification of uniform polymerization degree along the out-of-plane direction.
  • Demonstrated effectiveness of the strategy for hydrogel materials exhibiting significant deformation and potential for 4D printing.

Conclusions:

  • The proposed laser power compensation strategy effectively overcomes laser power decay issues in microscale 3D printing of hydrogels.
  • This technique is crucial for achieving homogeneous, shape-adaptive hydrogels, advancing 4D printing applications.
  • The strategy's applicability can be extended to other hydrogel materials with significant deformation properties.