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Method for Bionic Construction of Functionalized Janus Particles

A biomimetic construction and biomimetic function technology is applied in the field of preparation of Janus particles, which can solve the problems of lack of chemical reactivity on the surface of the product Janus particles, limiting the scope of preparation and use of Janus particles, and complex preparation processes, so that the preparation process can be easily controlled and enriched. Variety and function, stable effect of preparation process

Inactive Publication Date: 2018-03-06
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Generally, during the preparation or application of Janus particles, it is often accompanied by the occurrence of environmentally unfriendly processes, such as the need for special protective reagents, reducing reagents and other chemical reagents in the experimental preparation, or the preparation process is complicated, the process is cumbersome, and it is inconvenient to handle later. The lack of chemically reactive functional groups on the surface of Janus particles, etc., these factors limit the preparation and use of Janus particles

Method used

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  • Method for Bionic Construction of Functionalized Janus Particles
  • Method for Bionic Construction of Functionalized Janus Particles
  • Method for Bionic Construction of Functionalized Janus Particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1. Modified SiO2 2

[0044] 0.6g of SiO with a particle size of 520nm 2 Add microspheres into 30mL toluene, ultrasonically disperse evenly, then add 2.7g 3-aminopropyltriethoxysilane and 0.1g dimethyldichlorosilane, where SiO 2 The mass ratio of 3-aminopropyltriethoxysilane and dimethyldichlorosilane is 1:4.5:0.17, stirred at room temperature for 4 hours, and the reaction product is centrifuged, washed alternately with toluene and absolute ethanol, vacuum Dry to obtain the modified SiO 2 , and its water contact angle is 40.24°.

[0045] 2. Preparation of Pickering emulsion

[0046] 0.2g modified SiO 2 Add the microspheres into 10g of ultrapure water, ultrasonically disperse evenly, then place 1g of sliced ​​solid paraffin on the upper layer of the dispersion, and heat the dispersion to 75°C. After the solid paraffin is completely melted, use a homogenizer at 9000 rpm Disperse for 3 minutes to form a Pickering emulsion.

[0047] 3. Preparation of biomimetic functi...

Embodiment 2

[0053] In step 1 of the present embodiment, 0.6g particle diameter is 520nm SiO 2 Add microspheres into 30mL toluene, ultrasonically disperse evenly, then add 2.7g 3-aminopropyltriethoxysilane and 0.1g dimethyldichlorosilane, where SiO 2 The mass ratio of 3-aminopropyltriethoxysilane and dimethyldichlorosilane is 1:4.5:0.17, stirred at room temperature for 4 hours, and the reaction product is centrifuged, washed alternately with toluene and absolute ethanol, vacuum Dry to obtain the modified SiO 2 , and its water contact angle is 40.24°. Other steps are identical with embodiment 1, obtain SiO 2 / Ag Janus particles (see Figure 5 ).

Embodiment 3

[0055] In step 1 of the present embodiment, 0.6g particle diameter is 520nm SiO 2 Add microspheres into 30mL toluene, ultrasonically disperse evenly, then add 2.7g 3-aminopropyltriethoxysilane and 0.3g dimethyldichlorosilane, in which SiO 2 The mass ratio of 3-aminopropyltriethoxysilane and dimethyldichlorosilane is 1:4.5:0.5, stirred at room temperature for 4 hours, and the reaction product is centrifuged, washed alternately with toluene and absolute ethanol, vacuum Dry to obtain the modified SiO 2 , and its water contact angle is 46.57°. Other steps are identical with embodiment 1, obtain SiO 2 / Ag Janus particles (see Image 6 ).

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Abstract

The invention discloses a method for bionic construction of functional Janus particles. The method comprises the steps that two silane coupling agents with different hydropathy types are used for modifying SiO2, modified SiO2 with different wettabilities is obtained, the modified SiO2 is adopted as a particle emulsifier, and different types of Pickering emulsions are prepared under the effect of high-speed homogenization; then, on the basis of the mussel bionic principle, adhering characteristics and chemical reactivity of polydopamine or analogues thereof are used, so that the functional Janus particles with specific chemical regions can be obtained. According to the Pickering emulsion method, the yield of Janus particles is ensured, multi-functionalization of the Janus particles is achieved due to the auxiliary effects of polydopamine or analogues thereof, and more types of Janus particles, such as Janus / metal nanoparticles, Janus / inorganic compounds, Janus / organic compounds and the like are prepared.

Description

technical field [0001] The invention belongs to the technical field of preparation of Janus particles, and in particular relates to a SiO with adjustable wettability 2 The biomimetic modification of different types of Pickering emulsions prepared to obtain chemically reactive Janus particles. Background technique [0002] Janus particles are a kind of anisotropic particles with different physical and chemical properties due to different structures. Because of their asymmetry, different physical or chemical properties can be reflected on one particle. Therefore, Janus particles are used in particle emulsifiers. , nanoengine, magnetic response, optical sensing, electronic paper, interface catalysis, drug carrier, biotechnology and many other fields have extremely broad application prospects. [0003] At present, there are many methods for preparing Janus particles, among which the Pickering emulsion template method has the advantage of high yield due to its three-dimensional ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/02C08K9/06C08K3/36C08K3/08C08K3/22
CPCC08G73/02C08K3/08C08K3/22C08K3/36C08K9/06C08K2003/0806C08K2003/2275C08K2201/011
Inventor 邓字巍吴成蛟王延兵尚斌
Owner SHAANXI NORMAL UNIV
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