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Method for rapidly preparing superparticles based on Leidenfrost phenomenon

A particle and fast technology, applied in separation methods, chemical instruments and methods, and liquid separation into beads and granules, etc., can solve problems such as environmental hazards, complicated processes, and resource consumption

Active Publication Date: 2021-07-30
HUNAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Methods for preparing supraparticles in solution, preparation of supraparticles by kinetic / thermodynamic control, or template-based synthesis, although suitable for large-scale production, rely on the assistance of chemical additives, involving some toxic solvents, surfactants, In the later process, the chemical additives need to be separated from the superparticles, and then the relevant performance tests can be carried out. The process is complex, harmful to the environment, and consumes resources.

Method used

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  • Method for rapidly preparing superparticles based on Leidenfrost phenomenon
  • Method for rapidly preparing superparticles based on Leidenfrost phenomenon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Disperse 6g of ZnO nanoparticles and 6g of PMMA microparticles in deionized water, and perform ultrasonic treatment to obtain a dispersion with a mass concentration of 10%;

[0034] (2) Use a micro-injector to control the volume of the droplet, the volume of each droplet is 2 microliters, and the droplet is dripped onto an aluminum alloy plate with a surface temperature above 220°C under the action of its own gravity; The outlet of the injector is placed 20 mm above the upper surface of the aluminum alloy plate;

[0035] (3) After 56 seconds, the solvent evaporated completely, and the spherical superparticles formed by the solute were collected; ZnO&PMMA superparticles with an average particle diameter of 600 microns were obtained.

[0036] The obtained ZnO&PMMA superparticle particles were characterized by electron microscope, the result is figure 1 and figure 2 . figure 1 Shows the morphology of the resulting single ZnO&PMMA superparticles, a spherical shape w...

Embodiment 2

[0038] (1) 3.6g TiO 2Nanoparticles and 8.4g PMMA microparticles are dispersed in deionized water, and ultrasonically treated to obtain a dispersion with a mass concentration of 10%;

[0039] (2) Use a micro-sampler to control the volume of the droplet, the volume of each droplet is 4 microliters, and the droplet is added dropwise to an aviation aluminum alloy plate with a surface temperature above 240° C. under the action of its own gravity; The outlet of the micro-sampler is placed 15 mm above the upper surface of the aviation aluminum alloy plate;

[0040] (3) After 58 seconds, the solvent evaporated completely, and the spherical superparticles formed by the solute were collected; the TiO with an average particle diameter of 850 microns was obtained. 2 & PMMA super particles.

Embodiment 3

[0042] (1) 100g E-51 epoxy resin, 10.3g curing agent (diethylenetriamine) and 12.26g TiO 2 The nanoparticles are dispersed in ethyl acetate, and ultrasonically treated to obtain a dispersion with a mass concentration of 10%;

[0043] (2) Use a micro-sampler to control the volume of the droplet, the volume of each droplet is 4 microliters, and the droplet is added dropwise to an aviation aluminum alloy plate with a surface temperature above 270° C. under the action of its own gravity; The outlet of the micro-sampler is placed 15 mm above the upper surface of the aviation aluminum alloy plate;

[0044] (3) After 46 seconds, the solvent evaporates and collects the spherical superparticles formed by the solute; the resin & TiO having an average particle diameter of 900 microns 2 Ultraparticles.

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Abstract

A method for rapidly preparing superparticles based on the Leidenfrost phenomenon comprises the following steps: dispersing raw materials in a solvent, and performing ultrasonic treatment to obtain dispersion liquid ; controlling the volume of the liquid drop by using a microsyringe, and dropwise adding the liquid drop onto a hot surface with the temperature higher than the Leidenfrost temperature of the liquid drop under the action of the gravity of the liquid drop; and after the solvent is completely evaporated, collecting the spherical superparticles formed by the solute. The preparation process of the superparticles is greatly simplified, the application range is wide, the use of toxic solvents can be avoided, and the preparation speed is high; and many basic materials which cannot be prepared into superparticles in the prior art can also be used for obtaining aggregates through the method disclosed by the invention, so that the functionality is optimized, and new properties are found.

Description

technical field [0001] The invention relates to a method for preparing superparticles, in particular to a method for preparing superparticles based on the Leidenfrost phenomenon. Background technique [0002] Superparticles refer to a class of aggregates composed of nanoparticles or microparticles with a size ranging from tens of microns to hundreds of microns. The inherent high specific surface area and low mass of nanoparticles lead to high mobility problems in many systems. As agglomerates, superparticles assemble nanoparticles or micron-sized particles into larger entities that are easy to observe, handle, and recycle. At the same time the hazards associated with the high mobility of the primary nanoparticles are reduced. As agglomerates, superparticles continue the functional properties of the base structure, such as high catalytic activity endowed by high specific surface area. At the same time, due to synergy, coupling, and copolymerization, the agglomerates have s...

Claims

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Application Information

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IPC IPC(8): B01J2/02B01D1/24
CPCB01J2/02B01D1/24
Inventor 盛丽萍刘哲叶思妍邓雨炊晓雪向可锐邱荣朱辉军
Owner HUNAN NORMAL UNIVERSITY
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