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Colloid molecular structure magnetic mesoporous organic silicon composite microsphere and preparation method thereof

A technology of mesoporous organosilicon and molecular structure, which is applied in the preparation of microspheres, microcapsule preparations, nanotechnology, etc., can solve the problems of "difficult to control covalent bonds and difficult to control the appearance of composite microspheres in the synthesis, and achieve a simple synthesis process. Controllable, simple and controllable preparation process, regular morphology

Active Publication Date: 2021-03-26
ZHEJIANG SCI-TECH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, after removing the surfactant, the composite microspheres have a large specific surface area and good porosity, which solves the difficulty in synthesizing the morphology of the composite microspheres with a "colloidal molecule" structure and "covalent bonds" in the prior art. Bottleneck problem that is difficult to control

Method used

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  • Colloid molecular structure magnetic mesoporous organic silicon composite microsphere and preparation method thereof
  • Colloid molecular structure magnetic mesoporous organic silicon composite microsphere and preparation method thereof
  • Colloid molecular structure magnetic mesoporous organic silicon composite microsphere and preparation method thereof

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preparation example Construction

[0040] Such as Figure 7 As shown, a method for preparing magnetic mesoporous silicone composite microspheres with adjustable covalent bonds of "colloidal molecule" structure comprises the following steps:

[0041] (1) Preparation of magnetic Fe by solvothermal method 3 o 4 Nanoparticles (i.e. magnetic ferric oxide seed particles);

[0042] The magnetic Fe 3 o 4 The average particle size of the nanoparticles is: 150nm-350nm.

[0043] (2) Using tetraethyl silicate and dialkylorganosilane as silicon source precursor, cationic surfactant as porogen and nucleating agent, in magnetic Fe 3 o 4 Heterogeneous nucleation and growth of silica spheres hybridized with organic functional groups on the surface of nanoparticles to obtain magnetic silica spheres with a colloidal molecular structure;

[0044] (3) Use ammonium nitrate-ethanol solution to extract and remove the porogen in the organic functional group hybridized silica spheres to obtain magnetic mesoporous silicone spheres...

Embodiment 1

[0046] Embodiment 1 (as comparative example)

[0047] (1) Preparation of magnetic Fe with a particle size of 300 nm by solvothermal method 3 o 4 Nanoparticles;

[0048] (2) With tetraethyl silicate and dialkyl organosilane as silicon source, cationic surfactant as porogen and nucleating agent, in Fe 3 o 4 The heterogeneous nucleation and growth of organic functional group hybrid silica spheres on the surface of nanoparticles, the specific process is:

[0049] The 300nm Fe 3 o 4 The aqueous solution was dispersed in a mixed solution of 20mL deionized water and 50mg cetyltrimethylammonium chloride. After ultrasonic treatment for 30 minutes, it was transferred to a water bath at 40°C. After mechanical stirring for 10 minutes, concentrated ammonia water was added. After 30 minutes, silicon was added dropwise. Acetate tetraethyl ester (dropping rate is 0.024 mL / min), so that Fe 3 o 4 The molar ratio of seed particles / hexadecyltrimethylammonium chloride / ammonia water / silicon...

Embodiment 2

[0052] Compared with Example 1, only change the kind and the consumption that add alkoxysilane, make Fe 3 o 4 The molar ratio of seed particle / surfactant / ammonia / silicon source precursor is 1 / 1.4 / 72 / 6, wherein the volume ratio of tetraethyl silicate and 1,2-bis(triethoxysilyl)ethane is 5 / 1, other steps are the same, get AX 3 Magnetic mesoporous silicone composite microspheres with "colloidal molecule" structure.

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Abstract

The invention discloses a covalent bond adjustable colloid molecular structure magnetic mesoporous organic silicon composite microsphere and a preparation method thereof. The preparation method comprises the following steps: preparing water-soluble magnetic ferroferric oxide (Fe3O4) nanoparticles by adopting a solvothermal method; the preparation method comprises the following steps: by taking tetraethyl orthosilicate and dialkyl organosilane as silicon sources and taking a cationic surfactant as a pore-foaming agent and a nucleating agent, carrying out heterogeneous nucleation on the surfacesof Fe3O4 nano-particles and growing organic functional group hybridized silicon oxide spheres to obtain magnetic organic silicon composite microspheres with colloidal molecule structure; regulating and controlling the number of covalent bonds of'colloid molecules' by controlling the sol-gel reaction of the silicon source precursor; and removing the pore-foaming agent in the organic functional group hybridized silicon oxide spheres by adopting an ammonium nitrate ethanol solution to obtain the covalent bond adjustable magnetic mesoporous organic silicon composite microspheres with colloidal molecule structures. The invention provides a controllable preparation method of composite microspheres with the colloidal molecule structure.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a colloidal molecular structure magnetic mesoporous organic silicon composite microsphere with adjustable covalent bonds and a preparation method thereof. Background technique [0002] Colloidal molecule (C-M for short) refers to the analogy of a single nanoparticle to an atom in a molecule, and the construction of a nanocomposite particle assembly similar to the molecular structure (such as AX type Janus structure, AX 2 Type H 2 O Molecular Structure, AX 3 Type BF 3 Molecular Structure). This kind of colloidal particles can not only simulate a variety of molecular structures in terms of morphology and structure, but also can be multifunctionally combined in composition, with good structural design and functional control, especially in photonic crystal materials, catalysis, biological detection, Fields such as self-assembly have shown attractive application v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02B01J13/04B82Y30/00B82Y40/00
CPCB01J13/02B01J13/046B82Y30/00B82Y40/00
Inventor 孙阳艺张华王志强戚栋明
Owner ZHEJIANG SCI-TECH UNIV
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