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Processing Parameter-Performance Nexus in 3D Printing of Nanostructured Chiral Photonics
Kyle George1, Nader Taheri-Qazvini2, Peter D Olmsted3
1Department of Chemical Engineering, University of South Carolina, Columbia, SC, 29208, USA.
Small (Weinheim an Der Bergstrasse, Germany)
|January 19, 2025
Summary
This study details how 3D printing parameters control the liquid crystal nanostructure of hydroxypropyl cellulose (HPC) inks. Optimized processing yields vibrant structural color, enabling advanced material design.
Area of Science:
- Biomaterials Science
- Materials Engineering
- Polymer Science
Background:
- Naturally derived hierarchical architectures in biomaterials (e.g., cellulose, chitin, collagen) provide exceptional mechanical robustness and functionality.
- Additive manufacturing, specifically extrusion-based 3D printing, leverages material deformation for bottom-up design, enabling macroscale geometries with embedded nanoscale features.
Purpose of the Study:
- To conduct comprehensive rheological and rheo-optical characterization of photocurable liquid crystalline inks based on hydroxypropyl cellulose (HPC).
- To elucidate the structural dynamics of these inks under varying flow conditions and after flow cessation.
- To establish the relationship between 3D printing processing parameters and the resulting liquid crystal nanostructure for controlled material fabrication.
Main Methods:
- Rheological characterization to assess flow behavior.
- Rheo-optical measurements to probe liquid crystal nanostructure under flow.
- Extrusion-based 3D printing experiments to investigate the impact of shear rates.
- Analysis of structural color changes as an indicator of nanostructure ordering.
- Tailoring of curing kinetics to lock in desired liquid crystalline structures.
Main Results:
- Processing parameters significantly influence the ordering or disarray of the liquid crystal nanostructure in extruded HPC inks.
- Low to intermediate shear rates promote the ordering of chiral nematic domains, resulting in intense structural color.
- High shear rates lead to elastic instabilities, which degrade the photonic quality of the printed filaments.
- The study successfully correlated processing parameters with nanostructure formation.
Conclusions:
- Understanding and controlling the interplay between processing parameters and liquid crystal nanostructure is crucial for 3D printing structurally colored materials.
- Tailored processing conditions can be used to achieve desired photonic properties by manipulating the liquid crystal assembly.
- The developed photocurable HPC inks offer a pathway for fabricating intricate, functional materials with embedded nanoscale precision.
