Magnetic field response spherical microcapsulate with secondary structure, and preparation method thereof

A secondary structure, microcapsule technology, applied in the field of composite materials, can solve the problems of unstable structure and lack of force of ferric oxide, and achieve the effect of good biocompatibility

Inactive Publication Date: 2013-07-03
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure of composite microspheres lacks the necessary force between ferric oxide and the structure is unstable, and its application in acidic environments is limited to a certain extent.
[0005] At present, the composite microspheres formed by secondary assembly at the water-oil interface using functionally modified magnetic polymer microspheres as the basic unit have not been reported yet.

Method used

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  • Magnetic field response spherical microcapsulate with secondary structure, and preparation method thereof
  • Magnetic field response spherical microcapsulate with secondary structure, and preparation method thereof
  • Magnetic field response spherical microcapsulate with secondary structure, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of magnetic polymer microspheres

[0023] Dissolve 0.04g isoalcohol diester maleate in 40mL deionized water, stir for 30 minutes, add 0.4g oleic acid modified ferric oxide, 2mL styrene, 0.02g ammonium persulfate, heat up to 65°C and react for 24 hours. A nano-scale magnetic polymer microsphere emulsion is obtained. The particle size measured by dynamic light scattering is about 80nm; the microsphere structure is as follows figure 1 shown.

[0024] (2) Preparation of magnetic field-responsive spherical microcapsules with hierarchical structure

[0025] Take 1mL magnetic polymer microsphere emulsion and dissolve it in 10mL water / ethanol solution (the ethanol content is 15wt%), add 50mL toluene and stir at 40°C for 1 hour, then transfer to an ice-water bath and continue stirring for 30 minutes to obtain magnetic field-responsive spherical Microcapsules.

[0026] (3) Magnetic Response Properties of Magnetic Field Responsive Spherical Microcapsules with M...

Embodiment 2～4

[0029] The same process as in Example 1, but changing the ethanol content in (2) to 5wt%, 10wt%, and 25wt%, respectively, the results are shown in Table 1.

Embodiment 5～9

[0031] The process is the same as in Example 1, except that the toluene in (2) is changed to n-heptane, cyclohexane, n-pentane, benzene, and p-xylene, and the results are shown in Table 2.

[0032] Table 1: Table 1 is the result of Examples 2-4.

[0033]

[0034] Table 2: Table 2 is the result of embodiment 5~9.

[0035]

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Abstract

The invention discloses a magnetic field response type spherical microcapsulate with a multi-stage structure and a preparation method thereof, and relates to a stimulation response type composite material and the preparation method thereof. The preparation method provided by the invention adopts two assembling steps: firstly, a shell structure magnetic polymer nanosphere with ferroferric oxide folded inside is prepared under the action of surface-active agent, and a nano microsphere shell is enabled to have certain functions through molecular designing; and secondly, secondary assembling is performed under the interaction of resolvent and functional groups of the magnetic polymer microsphere shell as well as the combined action of oil-water boundary polarity difference so as to obtain the magnetic field response type spherical microcapsulate with the multi-stage structure. The spherical microcapsulate provided by the invention is formed by congregation of a plurality of magnetic nanospheres, disassembly is achieved through an additional alternating magnetic field, and the magnetic field response type spherical microcapsulate with the multi-stage structure and the preparation method are hopeful to be used well on fields such as emulsion stabilization, micro-reactor and the like.

Description

technical field [0001] The invention belongs to the fields of composite materials and self-assembly, and in particular relates to a magnetic field-responsive spherical microcapsule with a secondary structure and a preparation method thereof. Background technique [0002] Environmentally intelligent polymers and their assemblies have always been a research hotspot. Environmentally intelligent polymers refer to a class of polymers that can produce corresponding changes in physical structure or chemical properties in response to subtle stimuli from the external environment. External stimuli include temperature, pH, ionic strength, sound, electricity, light, magnetism, etc. Environmentally intelligent systems are widely used in the fields of sensors, smart switches, drug carriers, selective catalysis, and memory materials. [0003] Self-assembly refers to a technology in which basic structural units spontaneously form ordered structures, and it is also the cradle of advanced m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02
Inventor 戴李宗陈凌南曾碧榕何凯斌刘新瑜高辉毛杰余世荣陈国荣
Owner XIAMEN UNIV
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