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Method and device for jigging magnetic separation of superparamagnetic particles on gas-liquid interface

A technology of superparamagnetic particles and gas-liquid interface, which is applied in magnetic separation, chemical instruments and methods, solid separation, etc., and can solve problems such as controllable separation of magnetic particles

Inactive Publication Date: 2013-05-08
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, whether it is dry or wet magnetic separation technology, it can only separate magnetic particles from non-magnetic particles, and cannot controlly separate magnetic particles of different particle sizes.

Method used

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  • Method and device for jigging magnetic separation of superparamagnetic particles on gas-liquid interface
  • Method and device for jigging magnetic separation of superparamagnetic particles on gas-liquid interface
  • Method and device for jigging magnetic separation of superparamagnetic particles on gas-liquid interface

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Sorting superparamagnetic Fe 3 o 4 Particles, the specific steps are:

[0035] Step 1: Preparation of superparamagnetic Fe with a mass concentration of 0.5% 3 o 4 Particle dispersion: Superparamagnetic Fe 3 o 4 The particle size is 0.1-2.0 μm, and the particle shape is spherical; the dispersion medium is distilled water; mechanical stirring and ultrasonic dispersion are used to make superparamagnetic Fe 3 o 4 The particles are evenly dispersed in the dispersion medium;

[0036] Step 2: Superparamagnetic Fe prepared in Step 1 3 o 4 The particle dispersion is added to a magnetic separation container with a high-strength magnet placed above it, and the liquid level of the dispersion is about 0.2cm;

[0037] Step 3: Sorting superparamagnetic Fe 3 o 4 Particle size d p >1μm, η 1a v 1a =1.88×10 -6 Pa m, ρ p =5180Kg / m 3 , μ 0 =4π×10 -7Wb / (m A), x 0 =10 -3 m 3 / kg, H=1.6×10 5 A / m, g=9.81m / s 2 , according to the formula (3) to calculate the sorting partic...

Embodiment 2

[0041] Sorting Superparamagnetic ZrO 2 / Fe 3 o 4 Particles, the specific steps are:

[0042] Step 1: Preparation of superparamagnetic ZrO with a mass concentration of 1.0% 2 / Fe 3 o 4 Particle dispersion: superparamagnetic ZrO 2 / Fe 3 o 4 The particle size is 0.1-2.0 μm, and the particle shape is spherical; the dispersion medium is a 50% alcohol-water mixture; mechanical stirring and ultrasonic dispersion are used to make superparamagnetic ZrO 2 / Fe 3 o 4 The particles are evenly dispersed in the dispersion medium;

[0043] Step 2: Superparamagnetic ZrO prepared in Step 1 2 / Fe 3 o 4 The particle dispersion is added to a magnetic separation container with a high-strength magnet placed above it, and the liquid level of the dispersion is about 0.3em;

[0044] Step 3: Sorting superparamagnetic ZrO 2 / Fe 3 o 4 Particle size d p >0.75μm, η 1a v 1a =1.12×10 -6 Pa m, ρ p =5418Kg / m 3 (Superparamagnetic ZrO 2 / Fe 3 o 4 Granular ZrO 2 Coating layer and Fe 3 o...

Embodiment 3

[0048] Sorting Superparamagnetic PSt / Fe 3 o 4 Particles, the specific steps are:

[0049] Step 1: Prepare superparamagnetic PSt / Fe with a mass concentration of 1.5% 3 o 4 Particle dispersion: superparamagnetic PSt / Fe 3 o 4 The particle size is 0.1-2.0 μm, and the particle shape is spherical; the dispersion medium is distilled water; mechanical stirring and ultrasonic dispersion are used to make superparamagnetic PSt / Fe 3 o 4 The particles are evenly dispersed in the dispersion medium;

[0050] Step 2: Superparamagnetic PSt / Fe prepared in Step 1 3 o 4 The particle dispersion is added to a magnetic separation container with a high-strength magnet placed above it, and the liquid level h of the dispersion is 0.5 cm;

[0051] Step 3: Sorting superparamagnetic PSt / Fe 3 o 4 Particle size d p >0.1μm, η 1a v 1a =4.86×10 -7 Pa m, ρ p =3331Kg / m 3 (Superparamagnetic PSt / Fe 3 o 4 PSt coating layer of particles with Fe 3 o 4 nuclear mass ratio 1:6), μ 0 =4π×10 -7 Wb / (...

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Abstract

The invention relates to a method and a device for the jigging magnetic separation of superparamagnetic particles on a gas-liquid interface, and belongs to the field of particle magnetic separation. The method comprises the following steps of: adding 0.5 to 1.5 mass percent superparamagnetic particle dispersion with the particle size of 0.1 to 2.0mu m into a separation container above which a high-strength magnet is arranged, and ensuring that the liquid level height of the dispersion is 0.2 to 0.5cm; adjusting a distance between the lower surface of the high-strength magnet and the liquid level of the dispersion according to the magnetic property, density and gas-liquid interface mixed viscosity of the superparamagnetic particles, the intensity of a magnetic field on the surface of the high-strength magnet, and the particles to be separated; ensuring that the superparamagnetic particles to be separated jump out of the gas-liquid interface in the action direction of magnetic force, arrive at the lower surface of the high-strength magnet and are adsorbed; and moving the high-strength magnet away, and taking the separated superparamagnetic particles down from the lower surface of the high-strength magnet. The high-strength magnet of the device is positioned above the separation container, and a layer of plastic film is attached to the lower surface of the high-strength magnet; and the device can controllably separate the superparamagnetic particles under the action of an external magnetic field.

Description

technical field [0001] The invention belongs to the field of magnetic field separation of magnetic particles, in particular to a method for particle size separation of superparamagnetic particles controlled by the magnetic field of a permanent high-strength magnet. Background technique [0002] Superparamagnetic particles have many unique properties, so they are widely used in the fields of chemical industry, metallurgy, biotechnology and biomedicine, such as magnetic fluids, magnetic recording materials, catalysts or catalyst carriers, microwave absorbing materials, and cell Separation, immunoassay, protein purification, nucleic acid separation, targeted drugs, immobilized enzymes and other fields. In the past two decades, monodisperse superparamagnetic particles have also played an important role in the field-controlled assembly of photonic crystals. [0003] According to the purpose of use, sorting superparamagnetic particles with different particle sizes is becoming mor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03C1/02
Inventor 张辉安莎戴春爱李智
Owner BEIJING JIAOTONG UNIV