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Preparation method of Janus particle containing silicon dioxide with controllable particle size and asymmetrical degree

A silicon dioxide, asymmetric technology, applied in the field of materials, can solve the problems of complex preparation process, lack of Janus particle size and asymmetry, low Janus particle yield, etc., and achieves a simple process, easy implementation, and mild reaction conditions. Effect

Active Publication Date: 2016-06-22
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention is aimed at the lack of control of the particle size and asymmetry degree of Janus particles containing inorganic components based on phase separation, complicated preparation process, and low yield of Janus particles, and provides a simple and easy-to-industrial production of particle size and asymmetry Preparation method of silicon dioxide-containing Janus particles with controllable degree

Method used

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  • Preparation method of Janus particle containing silicon dioxide with controllable particle size and asymmetrical degree
  • Preparation method of Janus particle containing silicon dioxide with controllable particle size and asymmetrical degree
  • Preparation method of Janus particle containing silicon dioxide with controllable particle size and asymmetrical degree

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (a) Preparation of seed emulsion:

[0034]

[0035]

[0036] According to the above ratio, add coupling agent-modified silica, first monomer, hydrophilic monomer, crosslinking agent, emulsifier and deionized water into the reaction device, start stirring, condense and reflux, and pass nitrogen for 20 minutes , heated up to 60°C, added an initiator, polymerized for 4.0 hours, and obtained a seed emulsion;

[0037] (b) Preparation of Janus particles:

[0038]

[0039]Add deionized water to the seed emulsion in step (a), ultrasonically disperse for 30 minutes, start stirring, condense and reflux, blow nitrogen for 20 minutes, add the second monomer to swell at room temperature for 20 minutes, raise the temperature to 70°C, add an initiator, and polymerize for 5.0 h, the emulsion was centrifuged and vacuum-dried to obtain Janus particles. Among them, the diameter of the silica modified by the coupling agent is 80nm, and the grafting density of the silica surface ...

Embodiment 2

[0041] (a) Preparation of seed emulsion:

[0042]

[0043]

[0044] According to the above ratio, add coupling agent-modified silica, first monomer, hydrophilic monomer, crosslinking agent, emulsifier and deionized water into the reaction device, start stirring, condense and reflux, and pass nitrogen for 20 minutes , heated up to 60°C, added an initiator, polymerized for 4.0 hours, and obtained a seed emulsion;

[0045] (b) Preparation of Janus particles:

[0046]

[0047] Add deionized water to the seed emulsion in step (a), ultrasonically disperse for 30 minutes, start stirring, condense and reflux, blow nitrogen for 20 minutes, add the second monomer to swell at room temperature for 40 minutes, raise the temperature to 70°C, add an initiator, and polymerize for 5.0 h, the emulsion was centrifuged and vacuum-dried to obtain Janus particles. Among them, the diameter of the silica modified by the coupling agent is 80nm, and the grafting density of the silica surface...

Embodiment 3

[0049] (a) Preparation of seed emulsion:

[0050]

[0051] According to the above ratio, add coupling agent-modified silica, first monomer, hydrophilic monomer, crosslinking agent, emulsifier and deionized water into the reaction device, start stirring, condense and reflux, and pass nitrogen for 20 minutes , heated up to 60°C, added an initiator, polymerized for 4.0 hours, and obtained a seed emulsion;

[0052] (b) Preparation of Janus particles:

[0053]

[0054] Add deionized water to the seed emulsion in step (a), ultrasonically disperse for 30 minutes, start stirring, condense and reflux, blow nitrogen for 20 minutes, add the second monomer to swell at room temperature for 40 minutes, raise the temperature to 70°C, add an initiator, and polymerize for 5.0 h, the emulsion was centrifuged and vacuum-dried to obtain Janus particles. Among them, the diameter of the silica modified by the coupling agent is 80nm, and the grafting density of the silica surface coupling ag...

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Abstract

The invention relates to a preparation method of a Janus particle containing silicon dioxide with controllable particle size and asymmetrical degree. The preparation method comprises the following steps of adding silicon dioxide modified by a coupling agent, a first monomer, a hydrophilic monomer, a cross-linking agent, an emulsifying agent and deionized water into a reaction device; starting to stir; carrying out reflux condensation; leading nitrogen; warming to 50 to 80 DEG C; adding an initiating agent; polymerizing for 2.0 to 6.0h to obtain a seed emulsion; adding deionized water into the seed emulsion; starting to stir after ultrasonic dispersion; carrying out reflux condensation; leading nitrogen; adding a second monomer, and swelling for 10min to 60min at the room temperature; warming to 50 to 80 DEG C; adding an initiating agent; polymerizing for 1.0 to 5.0h; centrifugal separating and vacuum drying the emulsion to obtain the Janus particle containing the silicon dioxide. Compared with the prior art, according to the method provided by the invention, the technological process is simple, the particle size and the asymmetrical degree can be controlled, and the Janus particle is high in yield and easy for mass production.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to a method for preparing Janus particles containing silicon dioxide with controllable particle size and asymmetry. Background technique [0002] In addition to the inherent surface effect and small size effect of nanoparticles, Janus nanoparticles also have the characteristics of structural asymmetry and composition asymmetry. Therefore, Janus nanoparticles have great application prospects in the fields of emulsification, catalysis, sensing, thermal and electrical conductivity, polymer compatibilizers, and polymer phase compatibilizers. [0003] Currently, general methods for preparing Janus particles containing inorganic components include interface protection, competitive adsorption of incompatible ligands, and phase separation. Because the stability of small particle size particles at the interface is difficult to control, it is difficult to prepare Janus particles below 100n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F212/12C08F220/18C08F220/06C08F220/28C08K9/06C08K3/36C08F2/26
CPCC08F2/26C08F212/08C08F212/12C08F220/18C08K3/36C08K9/06C08K2201/011C08F220/1804C08F220/06C08F220/281C08F220/1802
Inventor 尤伟俞炜周持兴
Owner SHANGHAI JIAO TONG UNIV
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