Superficially Porous Particles via Coacervation
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Solution Overview
Problem
Existing methods for producing porous-shell particles, such as spray-drying and multilayer technology, often result in incompletely coated or contaminated particles, particularly for smaller diameters, and struggle with achieving optimal particle and pore size distribution.
Innovation Solution
A method involving the attachment of an organic surface modifier to a solid metal oxide core particle, followed by a coacervate coating with a continuous polymeric phase and particulate phase, where the polymeric phase is removed to form superficially porous particles, enhancing the formation of a well-defined porous shell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spray-drying method is used to make porous-shell particles, then production efficiency is improved, but particle coating completeness deteriorates and contamination increases
Solution Approach 1:
The patent introduces an organic material as an intermediary coating layer between the core particle and the porous shell. This organic layer serves as a template that directs the formation of the porous shell, ensuring complete and uniform coating while preventing contamination. The organic material is subsequently removed, leaving behind a well-defined porous structure without the need for high-pressure spray-drying.
Solution Approach 2:
The patent replaces the mechanical spray-drying process with a chemical coacervation process. Instead of using high-pressure mechanical atomization and thermal drying, the invention uses controlled chemical reactions and phase separation to form the porous shell, thereby achieving complete coating without the harmful effects of spray-drying.
2Manufacturing precision
If multilayer technology is used to make porous-shell particles, then coating uniformity is improved, but production time increases
Solution Approach 1:
The patent combines multiple coating steps into a single coacervation process. Instead of performing repeated electrostatic deposition cycles to achieve uniform coating, the invention uses one-step coacervation where the organic material and porous-forming agents simultaneously form a uniform porous shell around the core particle, dramatically reducing production time while maintaining coating uniformity.
3Productivity
If coacervation method is used to make porous-shell particles, then large-scale production is enabled, but particle size distribution deteriorates
Solution Approach 1:
The patent optimizes the parameters of the coacervation process, including pH, temperature, and concentration of reagents, to achieve both large-scale production and narrow particle size distribution. By carefully controlling these parameters, the invention ensures that the porous shell forms uniformly on all core particles simultaneously, preventing size variation even during scaled-up production.
4Reliability
If smaller particle diameters are targeted, then chromatographic performance is improved, but coating difficulty increases
Solution Approach 1:
The patent replaces mechanical coating methods with chemical coacervation, which is particularly advantageous for small particles. The chemical process allows uniform coating of sub-5 μm particles through molecular-level interactions, overcoming the coating difficulties associated with small particle sizes that plague mechanical and electrostatic methods.
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
This method produces particles with improved size distribution and performance in separation devices, specifically enabling smaller particle sizes and better chromatographic applications with reduced contamination and aggregation issues.
Implementation Method 1
attaching an organic surface modifier to a solid metal oxide core particle
Implementation Method 2
A coacervate coating is then formed on the surface modified solid metal oxide core particle, wherein the coating comprises a continuous polymeric phase bonded to the organic surface modifier and a particulate phase dispersed within the continuous polymeric phase
Data Source
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AI summary
Disclosed are porous-shell particles, methods of making the particles, and uses thereof. In one aspect, the porous-shell particles are superficially porous particles.