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Two-dimensional Janus nano material and preparation method thereof

A technology of nanomaterials and two-dimensional structures, applied in the field of polymers, can solve the problems of high cost, difficulty in controlling shape and size, and unprepared nanorings, and achieve the effect of low cost and convenient adjustment of microstructure

Inactive Publication Date: 2020-10-30
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common pulverization methods for preparing two-dimensional sheet-like materials (Walther, A.; Andre, X.; Drechsler, M.; Abetz, V.; Mueller, A.H.E. Janus Discs."Janus Discs", J.Am.Chem.Soc. 2007,129,6187-6198.) Although the Janus structure can be realized, the shape and size are difficult to control
Self-assembly method (Deng, R.H.; Liang, F.X.; Zhou, P.; Zhang C.L.; Qu, X.Z. Wang, Q.; Li, J.L.; Zhu, J.T. and Yang, Z.Z. Janus Nanodisc of Diblock Copolymers. Adv. Mater. 2014, 26, 4469-4472.) Although circular Janus nanosheets were obtained, the size was not uniform
The printing method commonly used to prepare two-dimensional ring materials (McLellan, J.M.; Geissler, M.; Xia, Y.N."EdgeSpreading Lithography and its Application to the Fabrication of MesoscopicGold and Silver Rings", J.Am.Chem.Soc.2004, 126 ,10830-10831.) High cost
Etching (Xu, H.; Goedel, W.A. "Mesoscopic Rings by Controlled Wetting of Particle Imprinted Templates", Angew.Chem., Int.Ed.2003, 42, 4696-4700.) cannot prepare nanoscale rings
Moreover, none of these methods have prepared nanorings with Janus structure, nor can they prepare sheet-like materials.

Method used

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  • Two-dimensional Janus nano material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1, the preparation of template A

[0042]Add ethanol (40mL) to silica microspheres (0.1g), add ethanol (25mL) to silver nitrate (0.09g), mix them at 50°C for 15min, add n-butylamine (0.05mL), and react for 10min , washed, and the samples were freeze-dried. The above product (0.1 g) was added with dichloromethane (50 mL) and n-octylethoxysilane (0.5 mL), stirred at room temperature for 6 h, and then washed. The above product was added into nitric acid (20 mL) containing 32 wt% water to react for 10 min, and then washed with ethanol. The surface of the above product was treated with an imidazolyl silane coupling agent and then washed. The imidazole group loaded on the modified silica ball was 2.3%, and the sample was freeze-dried. Get template A.

Embodiment 2

[0043] Embodiment 2, the preparation of template A

[0044] Add ethanol (40mL) to silica microspheres (0.1g), add ethanol (25mL) to nickel nitrate (0.09g), mix the two and stir at 50°C for 15min, then add n-butylamine (0.05mL) and react for 60min , washed, and the samples were freeze-dried. The above product (0.1 g) was added with chloroform (50 mL) and n-octylmethoxysilane (0.5 mL) and stirred at room temperature for 12 h, then washed. The above product was added into nitric acid (20 mL) containing 32 wt% water to react for 10 min, and then washed with ethanol. The surface of the above product was treated with an imidazolyl silane coupling agent and then washed. The imidazole group loaded on the modified silica ball was 2.4%, and the sample was freeze-dried. Get template A.

Embodiment 3

[0045] Embodiment 3, the preparation of template A

[0046] Add ethanol (40mL) to silica microspheres (0.1g), add ethanol (25mL) to nickel nitrate (0.09g), mix the two and stir at 50°C for 15min, then add n-butylamine (0.05mL) and react for 40min , washed, and the samples were freeze-dried. The above product (0.1 g) was added with chloroform (50 mL) and n-octylmethoxysilane (0.5 mL) and stirred at room temperature for 12 h, then washed. The above product was added into nitric acid (20 mL) containing 32 wt% water to react for 10 min, and then washed with ethanol. The surface of the above product was treated with an imidazolyl silane coupling agent and then washed. The imidazole group loaded on the modified silica ball was 2.9%, and the sample was freeze-dried. Get template A.

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Abstract

The invention discloses a two-dimensional Janus nano material and a preparation method thereof. The two-dimensional Janus nano material is prepared by self-assembling a block copolymer on a two-dimensional structure model through crosslinking. The preparation method comprises the following steps: 1) growing metal particles on the surfaces of silicon dioxide spheres, and then modifying the silicondioxide spheres with alkyl silane; then removing metal particles on the modified silicon dioxide spheres and loading imidazole groups to obtain a template A; and 2) mixing the block copolymer with thetemplate A, carrying out self-assembly in a polar organic solvent, and then adding a crosslinking agent to carry out a crosslinking reaction, thereby obtaining the two-dimensional Janus nano material. The chemical composition, the thickness and the outer diameter of the two-dimensional Janus nano material are adjustable; the preparation method has the advantages of simplicity, low cost, convenience in microstructure adjustment and the like. According to the preparation method, the Janus material with multiple potential functions, which is accurate in composition and structure regulation and control, can be rapidly prepared in batches.

Description

technical field [0001] The invention relates to a two-dimensional Janus nanometer material and a preparation method thereof, belonging to the field of macromolecules. Background technique [0002] The original meaning of Janus is the double-faced god of ancient Roman mythology. In 1991, de Gennes first proposed the concept of Janus in the field of polymers to describe particles composed of two materials with different chemical and physical properties (de Gennes, P.G. Soft Matter. Science. 1992, 256(5056), 495 -497). The multifunctional Janus material is a new material and has important application prospects in many fields. There are still many problems in the existing methods for preparing two-dimensional Janus nanomaterials. Common pulverization methods for preparing two-dimensional sheet-like materials (Walther, A.; Andre, X.; Drechsler, M.; Abetz, V.; Mueller, A.H.E. Janus Discs."Janus Discs", J.Am.Chem.Soc. 2007, 129, 6187-6198.) Although the Janus structure can be r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L53/00C08K13/06C08K9/02C08K9/06C08K7/18C08K5/29C08J3/24B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C08J3/24C08J2353/00C08K5/29C08K7/18C08K9/02C08K9/06C08K13/06
Inventor 杨振忠张杨梁福鑫
Owner INST OF CHEM CHINESE ACAD OF SCI
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