Ultrasonic Nanoparticle Slurry Deagglomeration Process
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Solution Overview
Problem
Current methods for manufacturing nanoparticle slurries face challenges such as uncontrolled agglomeration, high energy intensity, and difficulty in achieving particle sizes below 700nm, leading to inefficient dispersion and post-processing issues, especially in high solid concentrations.
Innovation Solution
A process involving the dispersion of inorganic particle agglomerates in an aqueous solvent using ultrasonic treatment with a solids content of 30-75w-% and dispersing agents, achieving efficient dispersion and high solid content slurries with particle sizes below 1µm, and optional drying to achieve stable, non-settling slurries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional mixing and dispersion methods are used for nanoparticle slurries, then the process is simpler, but the deagglomeration is limited and particle size below 1000nm cannot be achieved
Solution Approach 1:
The patent applies ultrasonic vibration (mechanical vibration) to break down particle agglomerates and achieve deagglomeration. The ultrasonic waves create cavitation bubbles that collapse and generate intense local forces, effectively separating agglomerated nanoparticles into individual particles with sizes below 1000nm, resolving the limitation of traditional mixing methods.
Solution Approach 2:
The patent changes the concentration parameter by processing slurries at high solid contents (30-75 w-%) instead of traditional low concentrations. This parameter change allows efficient dispersion and deagglomeration while maintaining high nanoparticle concentration, eliminating the need for subsequent concentration steps and simplifying the overall process.
2Ease of operation
If deagglomeration is performed in low solid concentrations, then dispersion is easier, but the process becomes more energy intensive and dewatering becomes highly challenging
Solution Approach 1:
The patent inverts the traditional approach by changing the concentration parameter from low to high (30-75 w-% solids). This allows the dispersion and deagglomeration processes to be performed efficiently at high concentrations, eliminating the energy-intensive concentration step and simplifying dewatering operations.
Solution Approach 2:
The patent combines multiple operations (dispersion, deagglomeration, and concentration) into a single continuous process step. By performing ultrasonic treatment on high-concentration slurries directly, the useful action continues without interruption, avoiding the need for separate concentration and dewatering stages.
3Ease of manufacture
If traditional mixing is used with large amounts of water, then the mixing process is simpler, but excess energy intensity is required due to inefficient dispersion
Solution Approach 1:
The patent changes the water-to-solids ratio parameter by processing slurries at high solid contents (30-75 w-%) instead of traditional low concentrations. This reduces the total volume of liquid that needs to be mixed and dispersed, significantly lowering the energy requirement for the mixing and dispersion processes while maintaining effectiveness.
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 process enables the production of consistent, high-solid-content nanoparticle slurries with superior optical, mechanical, and rheological properties, suitable for end products like coatings and adhesives, with improved gloss, durability, and resistance to scratches and abrasion.
Implementation Method 1
carrying out ultrasonic treatment at an intensity of 5-1000W/cm2
Implementation Method 2
processing (by ultrasonification) slurries with high solids contents
Implementation Method 3
by adding dispersing agent(s) and by carrying out ultrasonic treatment
Implementation Method 4
adding dispersing agent(s)
Implementation Method 5
achieve stable, non-settling slurries
Data Source
Figure 1~2
Figure 3~4
AI summary
The present invention concerns a process for manufacturing nanoparticles in a slurry based on an aqueous solvent by treating said inorganic particles or their agglomerates in said solvent at a solids content of 30–75w-%, by adding dispersing agent(s) and by carrying out ultrasonic treatment at an intensity of 5–1000W/cm2 on this concentrated slurry. Thereby, a homogenous consistent particle slurry is obtained.