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Janus nanomaterial with dual properties and preparation method thereof

A nanomaterial, mass percentage technology, applied in the field of Janus nanomaterials and its preparation, can solve the problems of harsh preparation conditions, difficult to obtain Janus nanoparticles, and unstable nanoparticles.

Inactive Publication Date: 2015-09-30
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method can prepare disc-shaped, rod-shaped and sheet-shaped Janus nanoparticles, but the characteristics of the interfacial self-assembly method based on block copolymers make this method demanding on raw materials and preparation conditions, which has great limitations
2) Pickering emulsion-assisted surface modification method (L.Hong, S.Jiang, S.Granick, Langmuir, 2006, 22, 9495-9499.), this method based on the three-dimensional spherical surface makes the yield greatly improved However, the low adsorption energy and violent Brownian motion of nanomaterials at the interface make the nanoparticles unstable, and it is difficult to obtain Janus nanoparticles
However, the above methods have strict requirements on raw materials and preparation conditions or can only obtain micron-scale Janus materials, so they have great limitations.

Method used

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  • Janus nanomaterial with dual properties and preparation method thereof
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 3

[0090] Example 3, use the emulsion system a2 to prepare Janus nanomaterials whose appearance is particles according to the second method

[0091] 1) According to the step 1) of Example 1, only the emulsion system a1 was replaced with the emulsion system a2 of the following composition to obtain Janus particles a2:

[0092] 0.65g ethyl orthosilicate, 0.112g aminopropyltriethoxysilane, 0.150g phenyltriethoxysilane, 0.65g polar solvent toluene, 0.125g emulsifier sodium dodecylsulfonate and 12.5 After mixing g water, use a high-speed shear emulsifier to emulsify at 1000 rpm for 2 minutes to obtain an emulsion system. In this emulsion system, the mass percent concentration of the inorganic precursor is 4.6%, and the mass percent concentration of the silane coupling agent is 1.8% %, the mass percentage concentration of polar solvent toluene is 4.6%, and the mass percentage concentration of emulsifier sodium dodecylsulfonate is 0.9%;

[0093] 2) Removing the template polystyrene in ...

Embodiment 4

[0096] Example 4, using the emulsion system a3 to prepare Janus nanomaterials whose appearance is particles according to method 2

[0097] 1) According to step 1) of Example 3, only the emulsion system a2 used was replaced with the emulsion system a3 of the following composition to obtain Janus particles a3:

[0098] 0.65g ethyl orthosilicate, 0.112g aminopropyltriethoxysilane, 0.155g 3-(methacryloxy)propyltrimethoxysilane, 0.125g emulsifier sodium dodecylsulfonate, After mixing 0.125g of emulsifier Tween80 and 12.5g of water, use a high-speed shear emulsifier to emulsify at 1000rpm for 2min to obtain an emulsion system. In this emulsion system, the mass percentage concentration of the inorganic precursor is 4.8%, and the silane coupling agent The total mass percentage concentration of the emulsifier is 2.0%, the mass percentage concentration of the emulsifier sodium lauryl sulfate is 0.9%, and the mass percentage concentration of the emulsifier Tween80 is 0.9%;

[0099] 2) R...

Embodiment 5

[0102] Example 5, using the emulsion system a3 to prepare Janus nanomaterials whose appearance is particles according to method 2

[0103] According to the steps of Example 4, only the silane coupling agent 0.155g 3-(methacryloyloxy)propyltrimethoxysilane in the emulsion system a3 used is replaced by 0.150g phenyltriethoxysilane, then the In the emulsion system a3, the mass percent concentration of the inorganic precursor orthosilicate is 4.8%, and the total mass percent concentration of the silane coupling agent aminopropyltriethoxysilane and phenyltriethoxysilane is 1.9%, the mass percentage concentration of emulsifier sodium lauryl sulfate is 0.9%, the mass percentage concentration of emulsifier Tween80 is 0.9%;

[0104]The above material is SiO with aminopropyl modification on one side and phenyl modification on the other side 2 composition, and aminopropyl, phenyl and SiO 2 They are all connected by -Si-O-Si-bonds, and the molar ratio of aminopropyl group to phenyl grou...

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Abstract

The invention discloses a Janus nano material with double properties and a preparation method of the Janus nano material. The preparation method disclosed by the invention comprises the following steps of: taking polymer colloidal particles as templates and acquiring organic and / or inorganic hybrid Janus particles based on the interface self-assembly and separation mechanism through a seed emulsion polymerizing method; and removing the template polymer colloidal particles and then directly acquiring the Janus nano particles or porous sheet materials. The controlling of the size, the micro structure and the chemical composition of the Janus nano particles or the porous sheet materials is realized by controlling the conditions of concentration and varieties of reactants. The Janus nano particles or the porous sheet materials have great application prospects in particle emulsifying agents, self-assembly, compatibilizer and nano motors.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to a class of Janus nanometer materials with dual properties and a preparation method thereof. Background technique [0002] Janus is a double-faced god in ancient Roman mythology. One side looks at the past and the other side looks at the future. Since the famous French scientist de Gennes first used the word Janus to describe particles with dual properties in his Nobel acceptance speech in 1991 (P.G.De Gennes, Rev.Mod.Phys., 1992, 64, 645-648), the surface has Janus particles with dual properties have attracted great research interest. This kind of Janus material with two different or even opposite properties (hydrophilic / hydrophobic, positive charge / magnetic, etc.) at the same time provides an effective way to solve key problems such as functionalization and dispersion of micro-nano materials. Combining the unique surface effect and small size effect of nanomaterials, Janus n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/113C01G23/053C01F7/02B82Y30/00
Inventor 杨振忠刘宝梁福鑫张成亮
Owner INST OF CHEM CHINESE ACAD OF SCI
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