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Flaky material with front and back surfaces having different properties and preparation method thereof

A technology of sheet-like materials and properties, applied in the field of sheet-like materials and their preparation, can solve the problems of difficult batch preparation, controllable preparation and unsolved mass preparation.

Inactive Publication Date: 2013-08-14
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing preparation methods [J.R.Link, M.J.Sailor.PNAS.2003, 100, 10607-10610; J.R.Dorvee, A.M.Derfus, S.N.Bhatia, M.J.Sailor.Nature Mater.2004, 3, 896-899] have great limitations In principle, it is difficult to prepare in batches
Although Janus structural sheet materials have shown unique properties and attractive broad application prospects, the controllable preparation and mass production of the composition and structure of sheet materials has not yet been solved, which has become the biggest bottleneck in its application.

Method used

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  • Flaky material with front and back surfaces having different properties and preparation method thereof
  • Flaky material with front and back surfaces having different properties and preparation method thereof
  • Flaky material with front and back surfaces having different properties and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Example 1 Silica Janus sheet material with amine groups on one side and phenyl groups on the other side:

[0082] Take 10g of ethyl orthosilicate, 2g of aminopropyltriethoxysilane and 1g of phenyltriethoxysilane and add them into 25g of toluene, mix well and use it as the oil phase. Add 2.5g of sodium lauryl sulfate to 50g of water, adjust its pH to 3 with 2mol / L hydrochloric acid, and use it as the water phase. Add the oil phase to the water phase, use a high-speed shear emulsifier to emulsify at 10,000 rpm for 10 minutes, transfer the obtained emulsion to a three-necked flask in a water bath at 70°C, and mechanically stir for 12 hours to discharge. This method directly obtains a Janus structure sheet material with an amine group on one side and a phenyl group on the other side with different properties on both sides. Electron microscope photographs of the material are figure 1 shown.

[0083] Using this example to prepare the Janus structure sheet material with an ...

Embodiment 2

[0084] Example 2 Titanium dioxide Janus flake material with amine groups on one side and dodecyl groups on the other side:

[0085] Take 5g of tetrabutyl titanate, 1g of aminopropyltrimethoxysilane and 1.2g of dodecyltrimethoxysilane and add them into 50g of toluene, mix well and use it as the oil phase. Get 5g of Op10 surfactant and add to 50g of water, its pH value is adjusted to 2.5 with 2mol / L hydrochloric acid, as water phase. Add the oil phase to the water phase, use a high-speed shear emulsifier to emulsify at 10,000 rpm for 5 minutes, transfer the obtained emulsion to a three-necked flask in a water bath at 50°C, and mechanically stir for 12 hours to discharge. This method directly obtains a Janus structure sheet material with an amine group on one side and an aliphatic alkyl group on the other side with different properties on both sides.

Embodiment 3

[0086] Example 3 Silica Janus sheet material with epoxy groups on one side and phenyl groups on the other side:

[0087] Take 6g of ethyl orthosilicate, 0.5g of epoxypropyltrimethoxysilane, 0.5g of phenyltriethoxysilane, 6g of Span80 and 1g of Tween80 and add them into 60g of toluene, mix well and use it as the oil phase. Take 50g of water as the water phase. Add the water phase to the oil phase, use a high-speed shear emulsifier to emulsify at 10,000 rpm for 2 minutes, transfer the obtained inverse emulsion to a three-necked flask in a water bath at 80°C, and mechanically stir for 24 hours to discharge.

[0088] This method directly obtains Janus structure sheet materials with epoxy groups on one side and phenyl groups on the other side with different properties on both sides. Electron microscope photographs of the material are figure 2 shown.

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Abstract

Disclosed are flake materials having different properties on its front and back sides (also known as Janus structure) and the preparing method thereof. In the preparing method, hollow sphere of non-organic, organic and non-organic / organic composite material is formed by materializing the oil-water boundary of emulsion, that is, by means of chemical reaction or physical absorption occurred at the interface between disperse phase and continuous phase of the emulsion, so as to prepare inner and outer surface structure of a spherical shell or construct different micro hollow spheres. Said flakes with Janus structure can then be obtained by cracking. A widely adaptive method for massive preparing the flakes with Janus structure is also provided. The flake material of this invention is of great practical value in many fields due to its different composition and properties on the front and back sides.

Description

technical field [0001] The invention belongs to the field of material technology, and relates to a sheet material with different properties on the front and back surfaces and a preparation method thereof. Background technique [0002] The controllable preparation of materials with special microstructures has always been an important content in the research of new materials. Since de Gennes in Germany first used the word Janus to describe the different chemical properties on the surface of inorganic particles at the same time in 1991, the research on microscopic particles with dual properties on the surface has become a research hotspot in the field of materials with special microstructures. Micron or nanoparticle (Janus) with dual properties (hydrophilic / hydrophobic) on the surface at the same time endow micron or nanoparticle with two different or even opposite properties (polar / nonpolar, positive charge / negative charge, etc.). The JANUS flake material with different prope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B3/10B32B9/04
CPCB32B9/04B32B3/10C08F2/24B82B3/00B82Y30/00C01B33/18C08L33/12
Inventor 杨振忠梁福鑫刘继广
Owner INST OF CHEM CHINESE ACAD OF SCI