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Micro 3D Printing Elastomeric IP-PDMS Using Two-Photon Polymerisation: A Comparative Analysis of Mechanical and

Pieter F J van Altena1, Angelo Accardo1

  • 1Department of Precision and Microsystems Engineering, Faculty of Mechanical, Maritime and Materials Engineering (3mE), Delft University of Technology (TU Delft), Mekelweg 2, 2628 CD Delft, The Netherlands.

Polymers
|April 28, 2023
PubMed
Summary

This study characterizes two-photon-polymerized IP-PDMS mechanical properties, crucial for cell culture. Printing parameters tune elastic modulus and feature size, enabling applications in mechanobiology and tissue engineering.

Keywords:
IP-PDMSYoung’s moduluselastomernanoindentationtwo-photon polymerisation

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Area of Science:

  • Materials Science
  • Biotechnology
  • Mechanical Engineering

Background:

  • Mechanical properties of two-photon-polymerized (2PP) polymers significantly impact cell mechanobiological responses in cell culture.
  • Elastomeric polymers like IP-PDMS are vital for mimicking physiological environments.
  • Understanding 2PP parameter influence is key for advanced biomaterials.

Purpose of the Study:

  • To characterize the mechanical properties of 2PP IP-PDMS structures.
  • To investigate the effect of printing parameters on Young's modulus (YM) and feature size.
  • To assess the influence of aqueous environments on material properties for cell biology applications.

Main Methods:

  • Optical-interferometer-based nanoindentation was used to measure effective Young's modulus.
  • Varying laser powers, scan speeds, slicing distances, and hatching distances were employed during 2PP.
  • Scanning electron microscopy (SEM) was utilized for morphological characterization of printed features.

Main Results:

  • Effective Young's modulus ranged from 350 kPa to 17.8 MPa, tunable via printing parameters.
  • Immersion in water reduced YM by an average of 5.4%.
  • Achieved minimum feature sizes included beams with widths down to 1.03 µm and lengths up to 70 µm.

Conclusions:

  • Tuneable mechanical properties of 3D 2PP IP-PDMS structures are demonstrated at the micron scale.
  • This material is suitable for cell biology applications, including mechanobiology, disease modeling, and tissue engineering.
  • The findings provide a foundation for designing advanced microstructures for biological research.