Speaker
Description
In the last decades, 3D printing has emerged as a powerful technique to create personalized objects and is now considered as a leading technology in numerous sectors of industry1. Using this solid basis, 4D printing was more recently introduced. Here smart (composite) materials are used to print functional objects with on demand properties. In this way, custom-made time-programmable properties are added to static 3D printed structures2.
This new concept, still at its infancy, is currently mostly used to create unifunctional objects, which means elements possessing a single response to external stimuli. In this project, we aim at developing 4D printed multifunctional objects based on the combination of a functional matrix embedding multi-elemental fillers, i.e. magnetic and plasmonic micro and nanostructures. The objective is to obtain designed magneto-plasmonic active elements.
First, a scale-up synthesis of raspberry like magneto-plasmonic particles was developed and particles were obtained by functionalizing magnetite particles with gold nanoparticles, giving 500 mg of particles per synthesis. A substantial save of time was obtained compared to classical synthesis3, enabling the synthesis of a sufficient quantity of particles for incorporation in a resin.
Second, we investigated the incorporation into a photopolymerizable resin for 3D printing by DLP. The choice of a formulation for the resin is also investigated to optimize the incorporation of these particles, and optimize its rheology to obtain a shape-changing or moving object with magnetism. The printing of small objects was then achieved, with a resin charged at 2% of mass.
The first developments of our project are promising and may lead to a proof of concept of a 3D printed object with time-dependant magnetic and plasmonic response, contributing to enrich the possibilities of 4D printing.
- Prashar, G., Vasudev, H. & Bhuddhi, D. Additive manufacturing: expanding 3D printing horizon in industry 4.0. Int J Interact Des Manuf (2022).
- Wang, J. et al. Biomimetic Shape–Color Double‐Responsive 4D Printing. Adv. Mater. Technol. 4, 1900293 (2019).
- Shen, W. et al. Synthesis of raspberry-like nanogapped Fe 3 O 4 @Au nanocomposites for SERS-based lateral flow detection of multiple tumor biomarkers. J. Mater. Chem. C 8, 12854–12864 (2020).
