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Microfluid reactor based nano-particle preparation and particle controlled preparation process

A microfluidic reactor and nanoparticle technology, applied in the field of nanoparticles, can solve the problems of mass transfer and heat transfer that are difficult to be uniform and unrealizable, and achieve the effect of inhibiting Ostwall ripening and improving stability

Inactive Publication Date: 2010-01-06
宋玉军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The ideal method is to control all reaction parameters to have uniformity in space and time when each particle is formed, but due to the large mixing volume, it is difficult to make the mass transfer and heat transfer of reactants uniform in time and space, conventional Tank reactors are basically unable to achieve this type of control

Method used

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  • Microfluid reactor based nano-particle preparation and particle controlled preparation process
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  • Microfluid reactor based nano-particle preparation and particle controlled preparation process

Examples

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Embodiment 1

[0044] The invention provides a method for preparing amorphous cobalt nanoparticles with stable structure and performance by a microfluidic process. Its reactor contains figure 2 Two-layer chip-based microfluidic reactor. The construction material of 20-a is polyetheretherketone substrate (PEEK), and the construction material of 20-b is photosensitive resin SU8. Its microfluidic reactor is characterized in that: as figure 2 As shown in Fig. 1, the first layer is sealed with a thin copper sheet (100 μm thick) with high heat transfer coefficient in the microchannel structure of the 9th area in Fig. A microfluidic channel (25) is formed, and the second layer of microfluidic channel is sealed to form a microfluidic heat exchanger that can cool the first layer of reaction liquid through the cooling liquid. The rest of the reactor is the same as Figure 1 The composition shown is consistent. The flow channel for delivering the reaction solution to the first mixing reactor (6)...

Embodiment 2

[0048]The reactor structure in example 1 is modified as follows to be used for producing Co Sm alloy nanoparticles: wherein the wedge-shaped flow path width that reacts liquid is delivered to the first mixing reactor (6) shrinks gradually from 200 microns to 30 microns, and reacted liquid mixes Enter into the first micro-flow channel (7) of 60 microns wide, 600 microns deep after becoming micro-glue nucleus, the about 30cm of flow channel is long, makes nucleus grow into nanoparticle in this district; Then enters the second mixing reactor (8), Directly contact with the low-temperature termination solution to lower the temperature, the flow channel width of the micro-channel port for delivering the low-temperature termination solution is 60 microns, and the flow rate is 1 times that of the nanoparticle reaction solution. After mixing, it enters the second micro-channel with a width of 120 microns (9 ), about 15cm long, continue the low-temperature termination reaction, wherein t...

Embodiment 3

[0052] The reactor structure in Example 1 is modified as follows to produce Co nanoparticles with stable structure and performance: wherein the width of the wedge-shaped channel that delivers the reaction solution to the first mixing reactor (6) shrinks gradually from 200 μm to 30 μm. micron, the reaction solution is mixed and enters the first micro-channel (7) with a width of 60 microns, so that the nanoparticles grow up at a constant temperature, and the length of this area is shortened to 20 cm. The flow rate of the feed liquid is adjusted to 0.9 mL / min and the second mixing The reactor (8) and the second microchannel (9) were skipped, and the obtained nanoparticle solution at 50 °C was directly sprayed into a stirred product cryogenic collection containing 100 mL of ethanol and THF (20 V% ethanol content) at 4 °C device (10), the collector is protected under an inert gas (such as argon). According to the flow rate, the particle size of the sprayed droplets can be as small ...

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Abstract

The invention discloses a microfluid reactor based nano-particle preparation and a particle controlled preparation process. The particle controlled preparation process is characterized in that technological parameters of particles in different generation steps are regulated and controlled in a nanoliter or smaller scale by a microfluid control technology, particles quickly mix and react to form cores on line, evenly grow up and are quenched to stop growing at low temperature so as to regulate and control the size, the shape, the crystal structure and the surface performance of the particles on line, and the hierarchical structure of the particles can be regulated and controlled. The method effectively inhibits widened size distribution and crystal lattice defect caused by Ostwald ripening and directional binding during nano-particle formation. Compared with a tank stirred reactor which is unable to respectively control the technological parameters of nano-particles in different generation steps, the microfluid reactor can increase the stability of the crystal structure and the physical performance of the particles, and the structure and the performance at least can be stabilized above three months to one year according to the types of the particles. The nano-particle output of the process can reach above 300ml / hour, and the process is an environment-friendly type nano-material continuous scale production process.

Description

technical field [0001] The invention relates to a method for preparing nanometer particles with stable structure and performance by a microfluidic reactor with process parameter program controllable, and belongs to the application of the microfluidic reactor in the field of material preparation. Background technique [0002] In engineering applications, the ultimate goal of controlling the size, shape and crystal structure of various nanoparticles is to obtain nanoparticles with stable crystal structure and various physical and chemical properties. The physical and chemical properties of particles are closely related to the size, shape, crystal structure, hierarchical structure and surface properties of particles. Its stability mainly depends on its surface properties and crystal structure. Among them, the crystal structure mainly depends on the interaction between atoms and the interaction between the constituent elements, and the interaction between the constituent elemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/00
Inventor 宋玉军
Owner 宋玉军
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