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

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...

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