Uniform Silicate Nanoparticles via Micro-Mixing
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Solution Overview
Problem
Scale-up of precipitation processes for inorganic powders faces challenges in maintaining uniform particle formation, mitigating mixing conditions in batch reactors, and avoiding parabolic flow issues in continuous reactors, leading to product losses and contamination.
Innovation Solution
A method involving micro-mixing of aqueous solutions of water-soluble silicate and cationic species in a branched tubular structure with static mixing elements, followed by macro-mixing in a batch reactor, under controlled pH and flow conditions, to produce uniform silicate-based nanoparticles with high uniformity and specific cation-to-silicon ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If batch precipitation is used, then ease of operation is improved, but manufacturing precision deteriorates due to localization and non-uniform particle formation
Solution Approach 1:
The continuous flow reactor is segmented into multiple parallel channels, each providing identical mixing and reaction conditions. This segmentation ensures that particle formation occurs uniformly across all channels, eliminating the localization problems of batch reactors while maintaining operational simplicity through continuous flow.
Solution Approach 2:
The patent replaces mechanical stirring (batch mixing) with controlled fluid flow and diffusion-based mixing in continuous channels. This substitution eliminates the non-uniform mixing inherent in batch mechanical stirring while maintaining ease of operation through simple flow control.
2Productivity
If continuous tubular flow reactors are used, then productivity is improved, but manufacturing precision deteriorates due to parabolic flow and product loss
Solution Approach 1:
The continuous reactor is divided into multiple parallel tubular channels, each with controlled dimensions and flow distribution. This segmentation ensures uniform flow characteristics across all channels, preventing the parabolic flow effects that cause non-uniform particle formation in single large tubular reactors.
Solution Approach 2:
The patent changes the flow regime parameters by using small-diameter parallel channels instead of large single channels. This parameter change transforms the flow characteristics to achieve uniform mixing and reaction conditions while maintaining continuous high-productivity operation.
3Adaptability or versatility
If scale-up is performed empirically, then adaptability is improved, but manufacturing precision deteriorates due to lack of understanding of physical and chemical processes
Solution Approach 1:
The patent incorporates monitoring and control mechanisms that provide feedback on particle formation conditions and product characteristics. This feedback enables precise control during scale-up, replacing empirical trial-and-error with data-driven optimization that maintains particle size uniformity across different production scales.
Solution Approach 2:
The invention systematically controls and adjusts physical and chemical parameters (flow rates, concentrations, temperature, pH) during scale-up based on understood reaction mechanisms. This parameter control approach maintains manufacturing precision while adapting to different production scales, replacing empirical methods with science-based scale-up.
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
Achieves uniformity of up to 99.9% and a cation-to-silicon ratio of 1.6 to 2.25 in nanoparticles, reducing product losses and contamination, and enabling scalable production of high-quality silicate-based powders.
Implementation Method 1
micro-mixing of aqueous solutions of water-soluble silicate and cationic species in a branched tubular structure with static mixing elements
Implementation Method 2
micro-mixing of aqueous solutions... in a branched tubular structure with static mixing elements, followed by macro-mixing in a batch reactor
Implementation Method 3
Precipitation, also called reactive crystallization, is one of the ways of producing pure phases of crystals or particles
Data Source
AI summary
Nanoparticles and method for producing uniform silicate-based nanoparticles are disclosed. The method comprises a step of injecting into tubular branched elements comprising static mixers a first aqueous solution comprising a water-soluble silicate compound and a second aqueous solution comprising a water-soluble compound releasing cationic species in solution, and allowing the reaction between the first and the second aqueous solutions in a micro-mixing regime, the method being characterized in that the overall mixing time is kept below 10−5 s. A further step of allowing the solution obtained in the micro-mixing regime to mix in a macromixing regime. Nanoparticles obtained through the present method are also disclosed.