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W/O/W multiphase emulsion and method for preparing hierarchical pore SiO2 microspheres using W/O/W multiphase emulsion as formwork

A technology of multiphase emulsion and hydrochloric acid aqueous solution is applied in the field of preparing multi-level porous SiO2 microspheres, and achieves the effects of simple preparation method, regular pore structure and high thermal stability.

Inactive Publication Date: 2015-11-04
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

More importantly, the W / O / W multiphase emulsion can be prepared by simple mixing in one step, so that the “one-pot” directly prepares the hierarchically porous SiO 2 Microspheres, this type of SiO with rich internal structure and interconnected multi-level pore structure 2 Microspheres are almost unreported

Method used

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  • W/O/W multiphase emulsion and method for preparing hierarchical pore SiO2 microspheres using W/O/W multiphase emulsion as formwork
  • W/O/W multiphase emulsion and method for preparing hierarchical pore SiO2 microspheres using W/O/W multiphase emulsion as formwork
  • W/O/W multiphase emulsion and method for preparing hierarchical pore SiO2 microspheres using W/O/W multiphase emulsion as formwork

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Dissolve 0.15g of small molecule stabilizer in 1mL of vinyltriethoxysilane, then add 4mL of hydrochloric acid aqueous solution with a pH value of 2, and mechanically stir at room temperature for 2 minutes at a speed of 11400 rpm to obtain W / O / W multiphase emulsion (see figure 1 ), it can be seen from the figure that the obtained multiphase emulsion droplet size is uniform.

[0038] In the above preparation process, the inventor added Nile Red to vinyltriethoxysilane for dyeing, and performed fluorescence microscope characterization of the obtained multiphase emulsion. The results are shown in figure 2 , the result proves that the type of emulsion is W / O / W type multiphase emulsion.

Embodiment 2

[0040] Dissolve 0.15g of small molecule stabilizer in 1mL of vinyltriethoxysilane, then add 4mL of hydrochloric acid aqueous solution with a pH value of 4, and mechanically stir at room temperature for 2 minutes at a speed of 11400 rpm to obtain W / O / W multiphase emulsion (see image 3 ), it can be seen from the figure that the droplet distribution in the obtained multiphase emulsion is uniform.

Embodiment 3

[0042] Dissolve 0.15g of small molecule stabilizer in 1mL of vinyltriethoxysilane, then add 4mL of hydrochloric acid aqueous solution with a pH value of 5, and mechanically stir at room temperature for 2 minutes at a speed of 11400 rpm to obtain W / O / W multiphase emulsion (see Figure 4 ), it can be seen from the figure that the droplet size in the obtained multiphase emulsion is uniform.

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Abstract

The invention discloses a W / O / W multiphase emulsion and a method for preparing hierarchical pore SiO2 microspheres using the W / O / W multiphase emulsion as a formwork. The multiphase emulsion uses micromolecular compounds as a stabilizing agent, uses a silylating reagent as an oil phase, and uses a hydrochloric acid aqueous solution of which the pH is 2-5 as an aqueous phase; the W / O / W multiphase emulsion is prepared by a one-step method, and the prepared emulsion is uniform in the distribution of liquid drops. According to the preparation method disclosed by the invention, the W / O / W multiphase emulsion is used as a formwork, the hierarchical pore SiO2 microspheres are prepared by a reaction under ammonia atmosphere, the operation is simple and easy, the cost is low, and the method is environmental-friendly; the prepared SiO2 microspheres have rich multistage pore canal structures, and the pore canal structures are regular, and good in permeability; besides, the SiO2 microspheres have large specific surface areas and high heat stability, the hydrophilic-hydrophobic property is adjustable, the carried functional groups are adjustable, and the SiO2 microspheres can be applied in the varied fields of adsorption, separation, catalysis, medicines and the like.

Description

technical field [0001] The invention relates to a W / O / W multiphase emulsion, and the preparation of hierarchically porous SiO using the W / O / W multiphase emulsion as a template 2 microsphere method. Background technique [0002] Multiphase emulsion, also known as complex emulsion, is a multilayer emulsion formed by dispersing one emulsion in another continuous phase. There are many types of multiphase emulsions, and the two types of W / O / W and O / W / O are the most common. In terms of structure, the multi-phase emulsion has a unique "two-membrane three-phase" multi-compartment structure, such as W / O / W multi-phase emulsion, which contains one or more water droplets in the oil droplets. This oil containing water droplets The droplets are then dispersed in the water phase to form an emulsion. Because of the special structure of the multiphase emulsion, it can dissolve some substances with different properties in different phases, and play a variety of functional effects such as i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
Inventor 彭军霞杜冠群张媛媛张红霞
Owner SHAANXI NORMAL UNIV
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