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Method for preparing half-strawberry type Janus particle

A strawberry-shaped particle technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problem of difficult preparation of Janus particles with complex structure

Active Publication Date: 2015-05-20
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is carried out in water-oil two-phase, which has great advantages in the preparation of simple Janus particles, but it is not easy to prepare Janus particles with complex structures.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Preparation of large particle size SiO 2 Core microspheres: amino-modified SiO 2 large microspheres

[0027] Add 55mL of ethanol, 16mL of water, and 12mL of ammonia water into a 100mL flask, stir magnetically for 20min, then add 5mL of tetraethyl orthosilicate (TEOS), and continue stirring for 5h. After the reaction is completed, centrifuge for 10min, then wash with water until PH=7, and Centrifuge with ethanol and ultrasonically disperse in 30 mL of ethanol. Solution A: Take 13mL of the above solution, 2mL of deionized water, 20mL of ethanol, and 10mL of ammonia water, and sonicate for 20min until uniform. Solution B: Take 10mL TEOS and 20mL ethanol, sonicate for 20min, and sonicate evenly. Add solution B to solution A quickly without touching the container wall. Stir rapidly for the first minute, then stir at a constant speed of 600 rpm for 5 hours. Then add 0.1 mL of APTES, stir for 19 hours, stop the reaction, wash until pH = 7, and dry for later use. The p...

Embodiment 2

[0036] Step 1 is the same as in Example 1.

[0037] 2. Preparation of small-size silica microspheres: nano-SiO modified by carboxylation 2

[0038] Add 50mL of ethanol, 1mL of water, and 1.2mL of ammonia water into a 100mL flask, stir magnetically for 20min, then add 1mL of tetraethyl orthosilicate (TEOS), continue stirring for 5h, add 0.08mLAPTES, stop the reaction after 19h, and centrifuge with acetonitrile until the pH = 7. Disperse in 30mL acetonitrile. Disperse 0.025g of succinic anhydride evenly in a certain amount of DMF 40mL, stir magnetically at a certain temperature for 3 hours, add about 20mL of DMF suspension of silicon dioxide dispersed by ultrasonic to the system, and add 2mL of deionized water at the same time . After continuing magnetic stirring at the same temperature for 5 hours, the nano-silica was separated by a high-speed centrifuge, washed with ethanol and centrifuged several times, and monodisperse nano-silica after carboxylation modification was obta...

Embodiment 3

[0043] 1. Preparation of large particle size SiO 2 Core microspheres: carboxyl-modified SiO 2 large microspheres

[0044] Add 55mL of ethanol, 16mL of water, and 12mL of ammonia water into a 100mL flask, stir magnetically for 20min, then add 5mL of tetraethyl orthosilicate (TEOS), and continue stirring for 5h. After the reaction is completed, centrifuge for 10min, then wash with water until PH=7, and Centrifuge with ethanol and ultrasonically disperse in 30 mL of ethanol. Solution A: Take 13mL of the above solution, 2mL of deionized water, 20mL of ethanol, and 10mL of ammonia water, and sonicate for 20min until uniform. Solution B: Take 10mL TEOS and 20mL ethanol, sonicate for 20min, and sonicate evenly. Add solution B to solution A quickly without touching the container wall. Stir rapidly for the first minute, then stir at a constant speed of 600 rpm for 5 hours. Then add 0.1mL of APTES, stir for 19h, stop the reaction, wash until pH = 7, and obtain amino-modified SiO wi...

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PUM

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Abstract

The invention relates to a method for preparing a half-strawberry type Janus particle. The method comprises the steps of: by taking a large-grain-size modified silicon dioxide microsphere as a core microsphere and taking a small-grain-size silicon dioxide or polymeric microsphere as a crown microsphere, using a Pickering emulsion method to modify the modified silicon dioxide microsphere into an initial Janus particle, and self-assembling with the crown microsphere by using the interaction between each function to obtain the half-strawberry type Janus particle. The preparation method has the characteristics of simple equipment and controllable operation, the product is pure, monodisperse and uniform in aperture. Compared with a common method, the method for preparing the half-strawberry type Janus particle has the advantages of controllable operation and simple method and is capable of preparing a complex Janus particle.

Description

technical field [0001] The invention relates to a method for preparing half-strawberry Janus particles, which is prepared by a Pickering emulsion modification-self-assembly two-step method, and belongs to the field of functional polymer materials. Background technique [0002] Janus particles can be applied in many fields due to their asymmetric properties in chemistry, physics and structure. The preparation and application of Janus particles has become one of the hotspots of current scientific research, and the application fields involve surfactants, molecular recognition, catalysts, etc. In order to obtain a better application effect, it is required that the prepared Janus particles have good stability, and at the same time, the size, shape, and matrix of the Janus particles must be effectively controlled. [0003] The preparation of Janus particles is a new research field emerging in recent years. The preparation method that adopts today is mainly Pickering emulsion met...

Claims

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Application Information

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IPC IPC(8): C01B33/12C08F222/14C08F220/14
Inventor 刘巍李可汤小龙胡继旋
Owner TIANJIN POLYTECHNIC UNIV
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