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Switching emulsion based on magnetic particles and preparation method thereof

A technology of magnetic particles and emulsions, applied in the fields of magnetic materials, magnetic objects, chemical instruments and methods, etc., can solve problems such as deficiencies, and achieve the effects of short emulsification time, low dosage and good emulsion stability

Active Publication Date: 2019-10-25
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on magnetic particles is limited to the fact that it can be used as an emulsion stabilizer to prepare Pickering emulsion (magnetic emulsion), or make the emulsion break through magnetic response under the action of an external magnetic field, but there are still some studies on the simultaneous realization of the above two functions. lacking

Method used

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  • Switching emulsion based on magnetic particles and preparation method thereof
  • Switching emulsion based on magnetic particles and preparation method thereof
  • Switching emulsion based on magnetic particles and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Embodiment 1, the superparamagnetic iron ferric oxide particle Fe of dendrimer modification 3 o 4 Preparation of @PAMAM

[0051] Fe 3 o 4 The synthesis route of @PAMAM magnetic particles is as follows figure 1 shown.

[0052] The specific method is as follows: in nitrogen atmosphere, 0.01mol Fe 3 o 4Disperse nanoparticles in 100ml ethanol, use 200ml toluene as solvent, add 0.0232mol 3-aminopropyltrimethoxysilane reagent to react at 110℃ for 8h, get black particles, then use anhydrous methanol as solvent, slowly add 0.05mol methyl acrylate Esters were reacted at 35°C for 40h to obtain magnetic particles modified with 0.5GPAMAM dendrimers. Finally, 200ml of anhydrous methanol was used as a solvent, and 0.1mol ethylenediamine was slowly added, and reacted at 45°C for 50h to obtain 1G Fe 3 o 4 @PAMAM magnetic particles.

[0053] Superparamagnetic Fe3O4 particles modified by prepared dendrimers Fe 3 o 4 @PAMAM for characterization. Such as figure 2 As shown, Fe...

Embodiment 2

[0055] Embodiment 2, the preparation of the emulsion based on magnetic particles

[0056] Will be dispersed with the Fe that different concentration embodiment 1 prepares 3 o 4 Dodecane (oil phase) of @PAMAM magnetic particles: water is added to the container at a volume ratio of 2:1, and emulsified on a vortex emulsifier at a speed of 2500r / s for 30s to obtain stable Fe 3 o 4 @PAMAM is an emulsion of emulsifiers.

[0057] Such as Figure 4 As shown, with the emulsifier Fe 3 o 4 With an increase in the content of @PAMAM, the volume V of the stable emulsion formed e increase, and this state can be maintained for a long time, and with the emulsifier Fe 3 o 4 As the content of @PAMAM increases, the volume of the stable emulsion accounts for the total system volume V total ratio (V e / V total ) were 80%, 90% and 100% respectively. After standing for a period of time, the emulsion did not change much. Until standing for 25 days, a small amount of demulsification occurred...

Embodiment 3

[0058] Embodiment 3, demulsification of emulsion based on magnetic particles

[0059] With the different concentration Fe that just prepared in embodiment 2 3 o 4 @PAMAM magnetic particle emulsion is placed on a large magnet (0.4T) and stirred at a low speed (stirring speed is 30r / min) for magnetic response demulsification. The demulsification effect is as follows Figure 5 shown. It can be seen that different concentrations of Fe 3 o 4 @PAMAM Magnetic Particle Emulsion has good demulsification effects, achieving complete separation of oil and water, and an obvious oil-water interface can be observed in the liquid. With Fe 3 o 4 As the content of @PAMAM magnetic particles increases, the longer it takes for the emulsion to achieve complete demulsification, the harder it is to break the emulsion. The demulsification time is 1min20s, 8min, and 17min20s respectively.

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Abstract

The invention discloses a type of emulsion based on magnetic particles and a preparation method thereof. The magnetic particle emulsion is prepared through oil and water emulsification by taking dendrimer modified magnetic ferroferric oxide particles as an emulsifier. By introducing an external magnetic field, the emulsion can be quickly demulsified under magnetic response and cyclically emulsified and demulsified. The method has the advantages of simple operation, low consumption of magnetic particles, low cost, reusability and green environmental protection.

Description

technical field [0001] The invention belongs to the field of surfactants, in particular to a switch-type emulsion based on magnetic particles and a preparation method thereof. Background technique [0002] A number of environmentally sensitive groups are introduced into the surfactant molecule. When environmental factors change, the internal molecular structure of the surfactant will change under the stimulation of the external environment (temperature, inorganic salt, magnetic field, pH value, carbon dioxide, etc.). Furthermore, by affecting its properties such as polarity and electrostatic force, the surface / interface properties of the surfactant will change significantly, thereby realizing the controllable activity of the oil-water interface. [0003] Magnetically responsive surfactants are a new class of surfactants, which are nanoscale particles with superparamagnetic properties. Superparamagnetism refers to a ferromagnetic substance with a single-domain structure when...

Claims

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Application Information

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IPC IPC(8): H01F1/00H01F41/00C01G49/08B01F17/36C08G83/00C08G73/02C09K23/36
CPCH01F1/0018H01F41/00C01G49/08C08G83/001C08G83/003C08G73/028C01P2004/01C01P2006/42C09K23/017
Inventor 杨惠王淑娟陈睿刘芳慧陈婷樊明红张威张珊美玉陈海波王金本
Owner INST OF CHEM CHINESE ACAD OF SCI
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