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Updated: Jan 3, 2026

Micro 3D Printing Using a Digital Projector and its Application in the Study of Soft Materials Mechanics

Micro 3D Printing Using a Digital Projector and its Application in the Study of Soft Materials Mechanics

Published on: November 27, 2012

Visualizing Morphogenesis through Instability Formation in 4-D Printing.

Dong Wu¹, Jiaqi Song¹, Zirui Zhai²

¹Department of Materials Science and Engineering , University of California, Los Angeles (UCLA) , Los Angeles , California 90095 , United States.

ACS Applied Materials & Interfaces

|November 20, 2019

Summary

This summary is machine-generated.

Researchers used 4D printing with stimulus-responsive hydrogels to mimic pumpkin

Keywords:

4D printing buckling digital light processing (DLP)heterogeneous structure instability morphogenesis

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Area of Science:

Materials Science
Biophysics
Mechanical Engineering

Background:

Biological systems exhibit heterogeneous growth, leading to diverse morphologies during maturation.
Pumpkin fruit development shows distinct circumferential buckling patterns.

Purpose of the Study:

To replicate pumpkin's unique surface buckling using 4D printing.
To elucidate the mechanisms behind heterogeneous 3D object instability.

Main Methods:

Utilized digital light processing (DLP)-based 3D printing.
Employed stimulus-responsive hydrogels for core-shell structures.
Investigated mechanical mismatch effects between core and shell.

Main Results:

Successfully reproduced pumpkin-like circumferential buckling in 4D printed core-shell structures.
Identified key parameters governing buckling: core/shell radius ratio, swelling ratio mismatch, and stiffness mismatch.
Demonstrated that the rigid core provides confinement and defines polar boundaries.

Conclusions:

4D printing of core-shell hydrogels can mimic biological fruit morphogenesis.
The study reveals general principles of instability formation in heterogeneous 3D structures.
This approach offers insights into bio-inspired design and material behavior.