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Magnetic response Janus nano-particles based on oil-in-water high internal phase emulsification and preparation method of magnetic response Janus nano-particles

A nanoparticle, magnetic response technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as loss of magnetism, ferric tetroxide is easily soluble in acidic solutions, etc.

Active Publication Date: 2021-05-18
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ferroferric oxide synthesized in the laboratory is easily soluble in acidic solution, and it is easy to oxidize and deteriorate and lose its magnetism.

Method used

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  • Magnetic response Janus nano-particles based on oil-in-water high internal phase emulsification and preparation method of magnetic response Janus nano-particles
  • Magnetic response Janus nano-particles based on oil-in-water high internal phase emulsification and preparation method of magnetic response Janus nano-particles
  • Magnetic response Janus nano-particles based on oil-in-water high internal phase emulsification and preparation method of magnetic response Janus nano-particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for preparing magnetically responsive Janus nanoparticles based on oil-in-water high internal phase emulsification, the steps are as follows:

[0038] (1) Preparation of magnetic nanoparticles Fe 3 o 4

[0039] Take 5.4g of FeCl 3 ·6H 2 O and 2.05 g FeCl 2 4H 2 Dissolve O in 100ml of distilled water, stir and dissolve with nitrogen gas, then under the condition of ultrasonic oscillation, add ammonia water with a mass concentration of 20% at a constant temperature of 75°C drop by drop until the pH of the solution is 10, continue to react for 40min, rinse repeatedly with distilled water and separate with a magnet, pump Dry at 80°C for 24 hours under vacuum.

[0040] (2) Preparation of core-shell nanoparticle Fe 3 o 4 @SiO 2

[0041] Take 1g of magnetic nanoparticles Fe 3 o 4 Ultrasonic dispersion in a mixed solution of 80ml of absolute ethanol and 10ml of distilled water, continue to add 3ml of ammonia water with a mass concentration of 20% and stir e...

Embodiment 2

[0055] Preparation of non-ionic magnetic Janus nanoparticles [(CH 2 OCH)-CH 2 -O]-Fe 3 o 4 @SiO 2 -octyl, the steps are as follows:

[0056] Steps (1)-(3) are the same as in Example 1.

[0057] Step (4) gets 1.1g by the magnetic nanoparticle Fe of paraffin semi-wrapped 3 o 4 @SiO 2 Stir and disperse in a mixed solution of 80ml of absolute ethanol and 10ml of distilled water, continue to add 2ml of 20% ammonia water and stir evenly, then add 0.12g of n-octyltrimethoxysilane drop by drop, react at a constant temperature of 40°C for 20h, and dissolve the paraffin with chloroform Particles release nanoparticle Fe 3 o 4 @SiO 2 -octyl, then washed several times with absolute ethanol and distilled water, and dried at 80°C for 24 hours for later use.

[0058] Step (5) gets 0.1g nanoparticle Fe3 o 4 @SiO 2 Ultrasonic dispersion of -octyl in a mixed solution of 80ml of absolute ethanol and 10ml of distilled water, continue to add 2ml of 20% ammonia water and stir evenly, th...

Embodiment 3

[0061] Preparation of 2# Anionic Magnetic Janus Nanoparticles HOOC-Fe 3 o 4 @SiO 2 -propyl, the steps are as follows:

[0062] Steps (1)-(3) are the same as in Example 1.

[0063] Step (4) gets 1.1g by the magnetic nanoparticle Fe of paraffin semi-wrapped 3 o 4 @SiO 2 Stir and disperse in a mixed solution of 80ml of absolute ethanol and 10ml of distilled water, continue to add 2ml of 20% ammonia water and stir evenly, then add 0.1g of propyltrimethoxysilane dropwise, react at a constant temperature of 40°C for 20h, and dissolve the paraffin particles with chloroform released nanoparticles Fe 3 o 4 @SiO 2 -propyl, then washed several times with absolute ethanol and distilled water, and dried at 80°C for 24 hours for later use.

[0064] Step (5) gets 0.1g nanoparticle Fe 3 o 4 @SiO 2 -propyl ultrasonically dispersed in a mixed solution of 80ml of absolute ethanol and 10ml of distilled water, continue to add 2ml of 20% ammonia water and stir evenly, then add 0.1g of a...

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Abstract

The invention discloses a magnetic response Janus nanoparticle based on oil-in-water high internal phase emulsification and a preparation method thereof. The nanoparticle has a shell-core structure, the core is a ferroferric oxide particle, the surface of ferroferric oxide is coated with a silicon dioxide layer to serve as a shell, and the front and back surfaces of the surface of the shell are respectively grafted with a hydrophilic group and a hydrophobic group. The preparation method of the magnetic response Janus nano-particle comprises the following steps: firstly, coating the surface of a ferroferric oxide particle with a silicon dioxide layer, and then respectively carrying out hydrophilic and hydrophobic modification on the front and back surfaces of the silicon dioxide layer to prepare the magnetic response Janus nano-particle. The Janus nano-particles synthesized by the method can be used for preparing a high internal phase emulsion with good stability under the conditions of low concentration and no auxiliary additive, and efficient oil-in-water emulsification oil displacement is realized.

Description

technical field [0001] The invention relates to the technical field of chemical flooding, in particular to a magnetically responsive Janus nanoparticle based on O / W high internal phase emulsification. Background technique [0002] As one of the important technologies in chemical flooding, emulsification flooding mainly realizes oil-water emulsification by injecting surfactant system or alkaline water to enhance oil recovery. In heavy oil reservoirs, injecting an active system to form an O / W emulsion between crude oil and formation water can not only indirectly reduce the viscosity of crude oil, but also reduce the oil-water interfacial tension and seepage resistance. When the sizes are matched, the droplets form a blockage at the throat to expand the swept area of ​​the injected phase. Commonly used emulsification systems are mostly surfactants such as petroleum sulfonate, co-surfactants, solid phase particles, and partially modified polymers. Alkaline water flooding mainl...

Claims

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Application Information

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IPC IPC(8): C09K8/584C09K8/60
CPCC09K8/584C09K8/602C09K2208/10
Inventor 乐雷蒲万芬赵帅
Owner SOUTHWEST PETROLEUM UNIV
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