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Free-form Light Actuators — Fabrication and Control of Actuation in Microscopic Scale
Published on: May 25, 2016
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Effective Light Directed Assembly of Building Blocks with Microscale Control.
Ngoc-Duy Dinh1, Rongcong Luo1, Maria Tankeh Asuncion Christine1
1Department of Biomedical Engineering, National University of Singapore, 21 Lower Kent Ridge Road, Singapore, 119077.
Small (Weinheim an Der Bergstrasse, Germany)
|May 9, 2017
Summary
This study introduces a high-throughput light-directed assembly printing technology using gold nanorods to create thermal convection flows for precise microparticle patterning. This method enables rapid, large-scale, scaffold-free tissue construction for advanced manufacturing.
Area of Science:
- Materials Science
- Biotechnology
- Nanotechnology
Background:
- Light-directed forces are used for micro/nanoscale patterning but require high laser intensity, limiting throughput.
- Existing methods face challenges in achieving high-throughput assembly of microscale objects.
Purpose of the Study:
- To develop a high-throughput light-directed assembly technology for microparticle patterning.
- To demonstrate the fabrication of patterned soft materials and scaffold-free tissues.
Main Methods:
- Utilized gold nanorods to induce thermal convection flows for microparticle manipulation.
- Employed microfluidics for fabricating monodispersed biocompatible microparticles.
- Controlled assembly precision by adjusting laser spot size.
Main Results:
- Achieved high-throughput, light-directed assembly of microparticles (40 µm to hundreds of micrometers) into desired patterns.
- Constructed large-scale (≈10 cm) structured assemblies in ≈2 minutes.
- Fabricated scaffold-free tissues using mesenchymal stem cell-seeded hydrogel microparticles.
Conclusions:
- The novel method offers effective light-directed assembly with microscale precision.
- This technique enables the bottom-up formation of patterned soft materials and functional tissues.
- The approach has broad applications in bioprinting, tissue engineering, and advanced manufacturing.
