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Compound Janus colloid particle and modified Janus colloid particle as well as preparation methods thereof

A particle modification technology, which is applied in the preparation of polymers, metal oxide composite Janus colloidal particles, inorganic substances, and metals, and can solve the problems that cannot be produced in large quantities

Inactive Publication Date: 2010-11-17
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can precisely control the chemical composition of the particles, there are two key problems that cannot be solved: 1. It can only prepare submicron-sized particles; 2. It cannot be produced in large quantities.
[0006] Therefore, we know that Janus particles have important potential application value and are a research hotspot in the field of material science. Although there have been many reports on the preparation methods of Janus particles in the literature, there is still no method that can be used in practical applications. True batch preparation

Method used

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  • Compound Janus colloid particle and modified Janus colloid particle as well as preparation methods thereof
  • Compound Janus colloid particle and modified Janus colloid particle as well as preparation methods thereof
  • Compound Janus colloid particle and modified Janus colloid particle as well as preparation methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Example 1, SiO 2 Preparation of / PS Janus particles

[0068] 1g SiO 2 (diameter 400nm) spherical particles dispersed in 10g ethanol, 1g water, 0.3g vinyltriethoxysilane mixed solution, ultrasonically dispersed evenly, stirred and reacted at 25°C for 10 hours, after the reaction, centrifuged with ethanol to wash away unreacted A silane coupling agent. 1g modified SiO 2 The particles are dispersed in 10g of water, and the ultrasonic dispersion is uniform. In addition, 2g of styrene (St), 2g of divinylbenzene (DVB), 0.5g of sodium dodecylsulfonate (SDS), 0.04g of potassium persulfate (KPS), and 50g of water were mixed and ultrasonically emulsified. Heat the seed system to 80°C, then start to add the emulsion system dropwise at a rate of 0.1ml / min, and keep the temperature for 2 hours after the dropwise addition is completed. After the reaction was completed, the product was washed with ethanol / water centrifugation. Disperse 1g of the product in 5g of 10wt% ammonium f...

Embodiment 2

[0069] Example 2, SiO 2 / TiO 2 Preparation of Janus particles

[0070] Gained SiO in 1g embodiment 1 2 / PS Janus particles are dispersed in 20g of sulfuric acid solution with a concentration of 30wt%, and reacted at 40°C for 5 hours. After the reaction, wash with water until neutral, and freeze-dry to obtain SiO 2 / SPS (sulfonated polystyrene) Janus granules solid powder. Take 1g SiO 2 / SPS Janus particles were dispersed in 1g of tetrabutyl titanate and 5g of absolute ethanol, stirred and adsorbed at room temperature for 10 hours, then centrifuged with absolute ethanol to wash away unadsorbed tetrabutyl titanate, and the particles were dispersed in 10g of Add 1 g of water to ethanol and hydrolyze at room temperature for 5 hours. After the hydrolysis reaction is completed, centrifuge and wash with water, and freeze-dry to obtain a solid powder. 1g of solid powder is placed in a sintering furnace, and in a nitrogen atmosphere, the temperature is raised to 600°C at a rate o...

Embodiment 3

[0071] Example 3, SiO 2 / Fe 3 o 4 Preparation of Janus particles

[0072] Gained SiO in 1g embodiment 2 2 / SPS Janus particles are dispersed in a mixed solution of 10g of ferric chloride (concentration 25wt%) and ferrous chloride (concentration 19wt%), adsorbed at room temperature for 10 hours, then centrifuged with water to remove unadsorbed iron salts, and then dispersed after washing In 10g of ammonia water with a concentration of 15wt%, react at room temperature for 5 hours. After the reaction, centrifuge and wash to obtain SiO 2 / Fe 3 o 4 Janus particles. The product was characterized by SEM, TEM, FTIR and XRD. XRD results show that TiO 2 The crystal form is compound type of anatase and rutile.

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Abstract

The invention discloses a compound Janus colloid particle and a modified Janus colloid particle as well as preparation methods thereof. Inorganic particles are taken as seeds, and a silane coupling agent modification method, a seed emulsion polymerization method, an inorganic surface etching method, method for inducing recombination functional materials by using polymer gel, and the like are combined to prepare inorganic / polymer, inorganic / inorganic, inorganic / metallic, inorganic / metallic oxide Janus particles. The structure and the size of the Janus particle can be controlled by controlling the activity of reactants, feeding speed, and the concentration of reactants, and the compounding of various kinds of materials can be realized. The Janus particle provided by the invention not only has good dispersibility, but also has good strength and size stability.

Description

technical field [0001] The invention relates to the field of complex structure colloids, in particular to a method for preparing composite Janus colloid particles of polymers, inorganic substances, metals and metal oxides by using inorganic particles as seeds. Background technique [0002] "Janus" originally refers to the two-faced god in ancient Roman mythology. In 1991, the famous French scientist Gennies used this word for the first time in his Nobel Prize-winning speech to describe those colloidal particles with chemical asymmetry [P.G.deGennes, Rev.Mod.Phys .1992, 64, 645-648.]. attached figure 1 It is a Janus particle model diagram, A and B respectively represent different chemical compositions, and the double spherical structure shows the structural complexity of the particle, just as a magnet has two poles at the same time, this chemical asymmetry endows colloidal particles with two different or even opposite characteristics. Functional Janus particles have potent...

Claims

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Application Information

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IPC IPC(8): C08F292/00C08F2/24C08F8/30C08F8/00
Inventor 杨振忠张成亮
Owner INST OF CHEM CHINESE ACAD OF SCI
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