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Supraparticle Engineering for Highly Dense Microspheres: Yttria-Stabilized Zirconia with Adjustable Micromechanical
Young-Rok Kim1,2, Tae Won Lee1, Seonhwa Park1
1Department of Functional Ceramics, Ceramic Materials Division, Korea Institute of Materials Science (KIMS), Changwon, Gyeongnam, Korea, 51508.
ACS Nano
|May 26, 2021
Summary
This study presents a method to create dense microspheres from supraparticles, achieving 99% density and enhanced mechanical properties like hardness and elastic modulus for advanced material applications.
Area of Science:
- Materials Science
- Nanotechnology
- Ceramic Engineering
Background:
- Supraparticles are known for catalytic properties due to porosity, but their mechanical properties are underexplored because of low density.
- Developing methods to enhance the mechanical integrity of supraparticle-based materials is crucial for expanding their practical applications.
Purpose of the Study:
- To develop a rational approach for fabricating highly dense microspheres from assembled supraparticles.
- To investigate the influence of controlled structural features on the micromechanical properties of these microspheres.
- To demonstrate the potential of supraparticle engineering for creating advanced functional materials.
Main Methods:
- Utilized a droplet-based template method (spray drying) to assemble 3 mol % yttria-stabilized zirconia (3YSZ) and alumina particles into supraparticles.
- Optimized suspension and process parameters to control supraparticle structural features like density, size, sphericity, and morphology.
- Applied heat treatment to transform supraparticles into highly dense microspheres with enhanced mechanical properties.
Main Results:
- Achieved highly dense microspheres (approximate relative density = 99%) with excellent sphericity (>98%) through controlled supraparticle assembly and heat treatment.
- The resulting microspheres exhibited superior mechanical properties, including a hardness of 26.77 GPa and an elastic modulus of 210.19 GPa.
- Demonstrated that supraparticle engineering allows precise control over structural features and micromechanical properties.
Conclusions:
- The proposed supraparticle engineering approach enables the fabrication of dense microspheres with exceptional mechanical strength.
- This method provides a pathway to tailor micromechanical properties, significantly broadening the applicability of supraparticle-based materials.
- The findings offer valuable insights for designing functional materials with high density and superior mechanical performance for demanding applications.
