Photomagnetic dual-response Pickering emulsion coalescence reaction system and application thereof

A reaction system, dual-response technology, applied in chemical/physical/physicochemical processes of applied energy, ferrous oxides, nanotechnology for materials and surface science, etc. Response switch and other problems, to achieve the effect of excellent driving effect

Active Publication Date: 2015-08-19
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the high stability and small size of Pickering emulsions make it difficult to effectively control its polymerization reaction switch from the outside.

Method used

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  • Photomagnetic dual-response Pickering emulsion coalescence reaction system and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 8.1g of FeCl 3 ·6H 2 O was added to 30mL of deionized water, stirred magnetically at 500rpm until completely dissolved to obtain FeCl 3 solution; 7.2g of FeCl 2 4H 2 O was added to 20mL of deionized water, 500rpm electric stirring, and 4mL of concentrated hydrochloric acid (36%~38%) was added at the same time, and stirred until completely dissolved to obtain FeCl 2 Solution; 29mL of FeCl 3 solution added to FeCl 2 Add 47mL of deionized water to the solution, stir it evenly at 500rpm, add 40mL of ammonia water to the mixture, and stir vigorously at 1000rpm for 30 minutes to obtain nano-Fe 3 o 4 Particles; place the nano-Fe in the solution with a magnet at the bottom of the beaker 3 o 4 The particles are precipitated, then the supernatant is discarded, washed with deionized water, dispersed evenly by ultrasonic waves, vigorously electric stirred at 1000rpm, placed at the bottom of the beaker with a magnet, and the nano-Fe in the solution 3 o 4 The particles sett...

Embodiment 2

[0023] Making Fe 3 o 4 / TiO 2 The process of the particles is the same as in Example One.

[0024] will get Fe 3 o 4 / TiO 2 The particles are fully ground into a uniform fine powder in a mortar, and the fine powder is transferred to a petri dish, and calcined in a muffle furnace at 500°C; the calcined powder is ground into a fine powder, transferred to a beaker, and added The mass percentage of 3 times the volume is 30% H 2 o 2 solution, ultrasonic dispersion for 5 minutes, electric stirring at 500rpm for 4 hours in the dark, and drying at 45°C; measure 0.3mL dodecyltrichlorosilane with a syringe, add it to 5.7mL n-hexane to make 5% by mass Dilute dodecyltrichlorosilane solution, ultrasonically disperse evenly; 2 o 2 Modified Fe 3 o 4 / TiO 2 Add the powder to a dilute dodecyltrichlorosilane solution with a mass percentage of 5%, ultrasonically disperse evenly, and stir electrically at 500rpm for 12 hours, during which n-hexane is added to avoid volatilization of n-...

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Abstract

The invention discloses a photomagnetic dual-response Pickering emulsion coalescence reaction system and its application. Firstly, Fe3O4 nano-particles are prepared by a hydrolysis process; secondly, the Fe3O4 nano-particles are used as crystal nucleus to prepare Fe3O4/TiO2 composite nano-particles by a butyl titanate hydrolysis process; thirdly, surface hydrophobic chemical modification is carried out on the Fe3O4/TiO2 composite nano-particles by the use of alkylsilane; and finally, emulsification is carried out to obtain the photomagnetic dual-response Pickering emulsion coalescence reaction system. The above method is simple and has strong operationality. Directional migration of the emulsion and recovery of the nano-particles can be realized through magnetic response (magnetism method). By photoresponse (UV irradiation), the nano-particles adsorbed on the surface of the emulsion are changed from the non-active property to the active property, thus leading to coalescence between adjacent emulsions. By simple non-intrusive methods such as the magnetism method and UV irradiation, etc., the emulsion coalescence reaction system undergoes a chemical reaction at fixed point (reaction site) and at a fixed time (response time). The photomagnetic dual-response Pickering emulsion coalescence reaction system has a good application prospect in the industry field.

Description

technical field [0001] The invention relates to the field of fine chemical industry, especially the field of micro reaction. Background technique [0002] Many industrial processes, such as pharmaceutical synthesis, pesticide preparation, functional materials, food processing, cosmetics production, etc., require micro-reaction systems. Faster response, simpler operation, and safer process are often the goals pursued by each micro-reaction system. The emulsion micro-reaction system greatly enhances the mass transfer reaction rate between the two phases with its large specific surface area, and the outer phase wrapping the inner phase blocks the volatilization of toxic substances in the inner phase reactants and causes harm to the human body. The traditional emulsion system mainly relies on surfactants to stabilize the emulsion, and most surfactants are organic compounds, which are irritating to the nasal mucosa, sensitizing to the skin, toxic, hereditary, carcinogenic, and p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/10B01J19/08B01J19/12B01F3/08B82Y30/00B82Y40/00C01G49/08C01G23/053
Inventor 孟涛谢春燕张青郭婷
Owner SOUTHWEST JIAOTONG UNIV
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