Fine Particles With Organic Coating Preventing Agglomeration
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Solution Overview
Problem
Fine particles tend to agglomerate due to high surface energy, leading to reduced surface area availability for reactions, inefficient dispersion in liquids, and increased costs due to the need for dispersants, which alter their surface energy and reduce their utility in surface chemistry applications.
Innovation Solution
The development of fine particles with a core and a coating comprising organic molecules, produced through a thermal plasma process, which prevents agglomeration and oxidation, maintaining high surface energy and stability, allowing for efficient dispersion and reaction without the need for dispersants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If fine particles are produced with high surface area to volume ratio, then surface energy and reactivity are improved, but agglomeration tendency increases
Solution Approach 1:
The patent introduces an organic coating layer as an intermediary substance between the fine particle cores. This coating acts as a mediator that reduces direct particle-particle interactions while preserving the high surface area of the core particles. The organic molecules form a protective barrier that prevents agglomeration through steric hindrance and reduces van der Waals attraction, allowing the particles to maintain both high surface area and stability.
Solution Approach 2:
The patent creates a composite structure consisting of an inorganic core particle coated with an organic layer. This composite material combines the high surface area benefits of fine inorganic particles with the stabilizing properties of organic coatings. The composite structure allows the system to simultaneously achieve high reactivity from the inorganic core and agglomeration resistance from the organic coating shell.
2Stability of the object's composition
If dispersants are used to prevent agglomeration, then dispersion stability is improved, but surface energy and reactivity are reduced
Solution Approach 1:
The patent extracts the stabilizing function from external dispersants and integrates it directly onto the particle surface through the organic coating. Instead of relying on separate dispersant molecules in the medium, the stabilization capability is built into the particle structure itself. This eliminates the need for additional dispersants that would otherwise compete for surface area and reduce reactivity.
Solution Approach 2:
The organic coating enables the particles to stabilize themselves without requiring external dispersants. The coating provides inherent steric stabilization and reduces interparticle attraction, allowing the particles to maintain dispersion stability through their own surface properties rather than relying on added chemicals. This self-service approach preserves maximum surface area for reactive functions.
3Ease of manufacture
If fine particles are sintered at high temperature, then particle formation is achieved, but particle separation and dispersion become difficult
Solution Approach 1:
The patent applies the organic coating to the particles immediately after their formation from the plasma process, before they have机会 to sinter or agglomerate significantly. This preliminary protective action prevents the onset of sintering by creating a barrier that reduces direct particle contact and heat transfer between particles. By coating early in the process, the particles remain separable and dispersible while still achieving the desired formation from the plasma synthesis.
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 coated fine particles remain unagglomerated and stable, maintaining high surface energy, enabling efficient reactions and improved dispersion in liquids, reducing the need for dispersants and enhancing their utility in applications like catalysis and printed electronics.
Implementation Method 1
introducing a core material into a plasma stream thereby vaporising some or all of the core material
Implementation Method 2
cooling the core material downstream from where the core material was introduced, thereby creating particles of the core material
Implementation Method 3
introducing a core material into a plasma stream thereby vaporising some or all of the core material
Data Source
AI summary
A fine particle comprising a core and a coating, wherein the coating comprises a substantially monomolecular layer of organic molecules. The fine particle being produced by a process comprising introducing a core material into a plasma stream, thereby vaporizing some or all of the core material; cooling the core material downstream from where the core material was introduced thereby creating particles of the core material; and coating the particles of the core material with organic molecules in an injection zone, wherein the injection zone is downstream of a region where the particles of core material are formed, or wherein the cooled particles of core material are coated with organic molecules in a coating chamber by applying a liquid coating material and/or a solution of coating material to the core material; where in the coating chamber is downstream of a region wherein the particles of core material are formed.