Opposing-Jet Mixer Reactor for Uniform Nanoparticles Without Blockages
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Solution Overview
Problem
Existing hydrothermal reactors face challenges in achieving rapid and efficient mixing of hot and cold streams, leading to non-uniform nanoparticle size and shape, frequent blockages, and inefficient cooling, which affects the quality and scalability of nanoparticle production.
Innovation Solution
A jet mixer reactor design with opposing inlet tubes for hot and cold fluid jets, a cooling stage to prevent preheating, and a high-pressure back pressure regulator for rapid cooling, combined with a capping agent to stabilize nanoparticles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If T- or Y-shaped reactors are used for mixing hot and cold streams, then mixing occurs, but frequent blockages occur due to precipitation of particles at the inlet of cold stream
Solution Approach 1:
The reactor is divided into distinct functional zones: a mixing zone where hot and cold streams collide, a reaction zone where nanoparticles form, and a separation zone where particles are removed. This segmentation allows each zone to be optimized for its specific function, preventing blockages by separating the mixing process from the particle formation and removal processes
Solution Approach 2:
A capping agent is introduced as an intermediary substance that stabilizes the nanoparticles formed during the reaction. The capping agent prevents particle aggregation and precipitation at the inlet, thereby preventing blockages while maintaining the mixing capability of the reactor
2Productivity
If hot and cold streams are mixed rapidly, then nanoparticle synthesis occurs, but temperature distribution becomes non-uniform leading to varying nanoparticle size
Solution Approach 1:
The reactor provides different local conditions in different zones: the mixing zone has high turbulence for rapid mixing, the reaction zone maintains controlled temperature for uniform nanoparticle formation, and the separation zone removes particles efficiently. This local quality differentiation allows rapid reaction while maintaining uniform nanoparticle size
Solution Approach 2:
The reactor dynamically adjusts operating parameters including temperature, pressure, and flow rates to optimize the balance between reaction speed and nanoparticle uniformity. By controlling these parameters, the system achieves high productivity while maintaining precise control over nanoparticle size distribution
3Ease of operation
If cold stream is preheated before mixing, then mixing efficiency improves, but temperature difference between streams decreases reducing nucleation rate
Solution Approach 1:
The system performs preliminary cooling of the hot stream and preliminary heating of the cold stream to optimal temperatures before mixing. This preliminary action ensures that when the streams mix, they achieve the desired temperature difference for high nucleation rate while still maintaining efficient mixing conditions
4Manufacturing precision
If reaction time is increased to produce larger particles, then nanoparticle size increases, but particle uniformity decreases and production efficiency drops
Solution Approach 1:
The reactor maintains continuous flow of reactants through the mixing and reaction zones, ensuring that the reaction proceeds continuously rather than in batches. This continuous action allows for precise control of reaction time and temperature, producing uniform nanoparticles with high production efficiency
Solution Approach 2:
The system rapidly transitions the cold stream through the mixing and reaction zones by using high-velocity flow, minimizing the overall reaction time while maintaining uniform nanoparticle formation. This rushing through the zones prevents particle growth that would reduce uniformity and efficiency
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
Enables continuous production of uniform nanoparticles with controlled size and shape, minimizing blockages and agglomeration, and efficient cooling, thereby improving the quality and scalability of nanoparticle synthesis.
Implementation Method 1
The solubility of precursors that are to be dissolved in water decrease near critical point of water (Tc: 374° C., Pc: 221 bar) due to a sharp drop in water density and an increase in concentration of [OH−]. The decrease in water density and the increase in [OH−] concentration is caused by a highly supersaturated media and leads to rapid nucleation of nanoparticles.
Implementation Method 2
An efficient mixing in contact zone or reactor may allow for an efficient and rapid heat and mass transfer between the two hot and cold streams and a more uniform temperature distribution within the reactor
Implementation Method 3
quenching the obtained nanoparticle slurry by passing the discharged nanoparticle slurry through a high-pressure back pressure regulator
Implementation Method 4
functionalizing a vapor phase of the nanoparticle slurry formed after the back pressure regulator by passing the vapor phase through a high concentration of at least one of a water-based capping agent and a solvent-based capping agent
Implementation Method 5
injecting a metal salt solution jet into the enclosure by pumping the metal salt solution through the first inlet, injecting a hot fluid jet into the enclosure by pumping the hot fluid through the second inlet tube, concurrently discharging the obtained nanoparticle slurry from the outlet tube
Data Source
AI summary
A method for producing metal and metal oxide nanoparticles in a hydrothermal process may include obtaining a nanoparticle slurry by precipitating nanoparticles within a jet mixer reactor, aging obtained nanoparticle slurry, quenching the aged nanoparticle slurry, and functionalization the nanoparticles. A jet mixer reactor may include an enclosure comprising an elongated side-wall extended along a longitudinal axis of the enclosure between a first end of the enclosure and an opposite second end of the enclosure, a first inlet tube extended along the longitudinal axis of the enclosure and connected to the first end of the enclosure, a second inlet tube extended along the longitudinal axis of the enclosure and connected to the second end of the enclosure, and an outlet tube extended perpendicular to the longitudinal axis of the enclosure and connected to the elongated side-wall of the enclosure.