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Nano particle surface physicochemcial structure cutting and coating method

A nanoparticle, physical and chemical technology, applied in the field of tailoring and coating of the physical and chemical structure of the surface of nanoparticles, can solve problems such as easy agglomeration, achieve the effects of low environmental pollution, simple coating process, and overcome repeated separation of solvents

Inactive Publication Date: 2005-05-18
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at overcoming the problem of easy agglomeration when coating nanoparticles, to improve the uniformity of single particle coating, and to more flexibly tailor the surface physical and chemical structure of the coating film according to different application purposes, the present invention proposes a nano Particle Surface Physicochemical Structure Tailoring and Coating Method

Method used

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  • Nano particle surface physicochemcial structure cutting and coating method
  • Nano particle surface physicochemcial structure cutting and coating method
  • Nano particle surface physicochemcial structure cutting and coating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1 Nanoparticle TiO 2 Uniform coating by plasma polymerization

[0040] use figure 1 The plasma coating reactor setup shown was used for coating experiments. First, the TiO nanoparticles to be coated, with an average particle diameter of about 30nm, are pre-acted by a 50KV high-voltage electrostatic generator for 5 minutes to make it charged. After taking it out, immediately put it into the porous distribution plate 3 at the bottom of the plasma reactor 6 (for detailed structure, refer to figure 2 )superior. The reactor 6 is evacuated by the vacuum system 7 to a background vacuum of 5Pa. The monomeric acrylic acid and the carrier gas argon are respectively measured through the flow meter 1, and the volume ratio is 1:50. After being uniformly mixed in the gas mixer 2, they are introduced into the plasma reactor 6 at a flow rate of 10 sccm through the porous distribution plate 3 , so that the particles are in a fluidized state, and the vacuum degree drops to 1...

Embodiment 2

[0042] Example 2 Cr 2 o 3 Experiments on Effects of Nanoparticle Plasma Coating Conditions on Coating Thickness

[0043] use figure 1 For the plasma coating reactor device shown, the operation steps refer to Example 1.

[0044] in Cr 2 o 3 Nanoparticles are the coating objects, with an average particle size of 150nm, charged by a 20KV high-voltage electrostatic generator for 1 minute, immediately placed in the plasma reactor 6, vacuumed to a background vacuum of 4Pa, and injected with hexamethyl di A mixed gas of siloxane and nitrogen, the volume ratio of the two gases is 10:50, the flow rate is 60 sccm, and the vacuum degree is reduced to 200 Pa. Turn on the plasma generator 5 and the stirrer 4, control the discharge power to be 40W, the discharge time to be 8 hours, the discharge pulse ratio to be 50%, the pulse "on" time to be 2ms, and the stirring speed to be 500 rpm.

[0045] After coating, the sample was detected by high-resolution transmission electron microscopy ...

Embodiment 3

[0046] Example 3 The test of the influence of pulsating radio frequency plasma coating conditions on the surface roughness of the coating film

[0047] use figure 1 The plasma cladding reactor setup is shown.

[0048] In order to observe the relationship between the pulsating radio frequency plasma coating conditions and the surface roughness of the coating film, a flat glass sheet is selected as the coating object. After cleaning, it is placed in the plasma reactor 6 and vacuumed to a background vacuum of 4Pa. , into a mixed gas of hexamethyldisiloxane and argon, the volume ratio of the two gases is 10:90, the flow rate is 10 sccm, and the vacuum is reduced to 30 Pa. Turn on the plasma generator 5 for discharge polymerization. Discharge time is 1 hour, polymerization finishes, takes out sample and does atomic force microscope (AFM) analysis, the atomic force microscope picture of gained sample is shown in Figure 6 . Figure 6 The discharge power of medium a is 3w, the pu...

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Abstract

A method for tailoring and covering the surface of nanoparticles with physical and chemical structures. By modulating the radio frequency plasma, controlling the discharge conditions such as pulse ratio, time, and power, and then controlling the type, content, thickness of the deposited layer, and roughness of the coating, etc., the coating object such as TiO 2 Selectively "cut" the surface of nanoparticles to coat the film with specific monomer molecular functional groups, and control the physical form such as the thickness and surface roughness of the coating layer to obtain a coating film with specific physical and chemical structures, and change the size of the nanoparticles. physicochemical structure of the surface. Compared with the traditional coating method, this method has the advantages of dry state, normal temperature, less environmental pollution, uniform film layer, controllable thickness, tight combination of coating layer and nano core, and wide range of monomer selection. It can reduce the agglomeration of nanoparticles through steric physical hindrance and chemical compatibility, so as to reflect the special effect of small size on nanoparticles. It can also be used in the development of nanocomposite particles, etc.

Description

technical field [0001] The invention relates to a method for coating a layer of thin film on the surface of nanoparticles by using plasma discharge method. Specifically, it relates to a method of tailoring and coating the physical and chemical structure of the surface of nanoparticles, which is to modulate the discharge parameters of the pulsating radio frequency plasma under vacuum plasma conditions, and selectively tailor and design the coating according to the different coating objects. The chemical and physical structure of the film, so as to achieve the purpose of tailoring the surface physical and chemical structure of nanoparticles. Background technique [0002] At present, the research and application of various structural and functional nanoparticle materials are attracting more and more attention. When forming nanocomposites, only when the size of any one of the phases reaches 100 nanometers or less, the specific functionality brought by its small size can be real...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02C04B35/628C23C14/12
Inventor 张菁朱峰王迎杨沁玉周荣铭
Owner DONGHUA UNIV
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