Molded Article With Controlled Cerium Oxide Particle Size
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Solution Overview
Problem
Molded articles with high cerium oxide content for iodate ion adsorption face challenges in maintaining strength and durability when the binder resin content is reduced, leading to potential aggregation of cerium oxide particles and decreased adsorption performance.
Innovation Solution
Incorporating cerium oxide particles with specific particle diameters (1-15 μm) and crystallite sizes (40-200 Å) into a molded article, along with a binder resin, to enhance strength and durability while maintaining high adsorption performance, even with a reduced binder resin content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the content of binder resin is reduced to increase cerium oxide content for high adsorption capacity, then the adsorption performance is improved, but the strength and durability of the molded article deteriorate
Solution Approach 1:
The invention changes the physical parameters of cerium oxide particles, specifically controlling the particle size distribution (D10, D50, D90 values) and crystallite size (40-200 Å). This parameter optimization allows cerium oxide particles to pack more efficiently and interlock, providing structural strength even with minimal binder resin (5-20 mass%). The specific particle size range creates a balanced structure where adsorption capacity is maximized while mechanical integrity is maintained through particle-to-particle contact points.
Solution Approach 2:
The invention creates a composite structure where cerium oxide particles with specific size distributions form a semi-rigid framework that partially replaces the binder resin's structural role. The combination of fine particles (for surface area and adsorption) and controlled larger particles (for structural integrity) creates a composite material system where the inorganic cerium oxide network provides both functional and mechanical properties, reducing dependence on organic binder resin.
2Quantity of substance
If the content of binder resin is reduced to maximize cerium oxide content, then the adsorption capacity increases, but cerium oxide particles aggregate and disperse unevenly, deteriorating adsorption performance
Solution Approach 1:
The invention optimizes the particle size distribution parameters (D10, D50, D90) to achieve a balanced mixture where fine particles fill gaps between larger particles, preventing aggregation. The controlled size range ensures sufficient surface area for adsorption while maintaining uniform distribution. The crystallite size control (40-200 Å) further prevents particle sintering and aggregation during molding and drying processes, ensuring homogeneous dispersion even with low binder resin content.
3Quantity of substance
If high cerium oxide content is used to improve adsorption performance, then the adsorption capacity increases, but the durability during repeated use decreases due to insufficient strength
Solution Approach 1:
The invention controls the particle size distribution with specific D10, D50, and D90 values to create a graded structure that enhances durability. The presence of finer particles (D10 range) creates a denser packing with more contact points between particles, forming a more robust network that withstands mechanical stress during repeated use. The crystallite size control prevents particle fragmentation, maintaining structural integrity over multiple adsorption cycles.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The resulting molded article exhibits excellent strength, durability, and prolonged adsorption performance as an iodate ion adsorbent, with a high cerium oxide content and specific surface area, effectively addressing the limitations of previous technologies.
Implementation Method 1
a cerium compound, which is known as an adsorbent for selenium, boron, arsenic and the like, is used as an adsorbent for iodate ions
Data Source
AI summary
To provide a molded article which can have excellent strength, can also have high durability during repeated use, and can maintain high adsorption performance even when the content of a binder resin is reduced. A molded article containing cerium oxide particles and a binder resin, wherein cerium oxide particles which has an average particle diameter of 1 to 15 μm and in each of which a crystallite size is 40 to 200 Å are used.