A kind of coated core-shell structure composite particle and its preparation method and application

A technology of core-shell structure and composite particles, which is applied in the field of composite materials, can solve the problems of easy breakdown of test devices, large length of applied electric field, and increased requirements for test cleaning cleanliness, etc., to achieve good application prospects, low electric field strength, Effect of good light absorption and electron transport properties

Active Publication Date: 2021-02-26
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The limitations of this method are mainly reflected in two aspects: one is that the length of the applied electric field is large, and it is easy to break down the test device; the other is that the test environment needs to be closed, which increases the requirements for test cleaning and cleanliness

Method used

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  • A kind of coated core-shell structure composite particle and its preparation method and application
  • A kind of coated core-shell structure composite particle and its preparation method and application
  • A kind of coated core-shell structure composite particle and its preparation method and application

Examples

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Embodiment 1

[0042] see figure 1 with figure 2 , this embodiment provides a method for preparing coated core-shell structure composite particles, comprising the following steps:

[0043] 2.0g of titanium dioxide nanoparticles were annealed and calcined at 500°C for 10 hours, and then dispersed in a 50mL three-necked flask filled with 10g of deionized water to obtain suspension mixed A solution, and the pH value of the solution was adjusted to 9-10 with 20% NaOH solution. Stir evenly under a magnetic stirrer at a stirring speed of 400r / min, heat up to 75°C, and add 6mL of 10% NaAlO dropwise within 60min 2 solution, adjust the pH value with 20% HCl solution, maintain the pH value in the range of 8-9, adjust the pH value to promote the hydrolysis of the sodium metaaluminate solution, maintain the pH value 7-8, and react at a constant temperature of 75 ° C for 60 minutes to prepare TiO 2 / Al 2 o 3 Nanoparticles (Substance A).

[0044] After the material A prepared above was ground, the c...

Embodiment 2

[0047] Take 0.0065 g of the coated core-shell structure composite particles prepared in Example 1 and disperse them in 5 mL of 98% n-undecane, add the nonionic surfactant LSpan80 according to the mass ratio of 9:1, and ultrasonically disperse to obtain a uniformly suspended white milky liquid. In a device with an electrode spacing of about 100 μm, the ultra-low DC voltage is set to 0V, and the actual output value is 0.13V, which is recorded every 10s. The coated core-shell composite particles of the present invention can quickly self-assemble between the two plates to form chains. shape structure. In this example, the principle diagram of inducing the self-assembly of coated core-shell composite particles to form a chain structure is as follows Figure 4 as shown, Figure 4 (a) and Figure 4 (b) Top and front views of the self-assembly schematic, respectively. When an external electric field is applied, the coated core-shell structure composite particles are polarized by t...

Embodiment 3

[0050] This example is the same as Example 2, except that the set ultra-low DC voltage is changed from 0V to 70V, the electric field is 0.7kV / mm, and the optical microscope image is obtained from the initial applied voltage to the applied voltage for 50s with an interval of 10s Such as Image 6 (a)-(f) shown. At the beginning of applying the voltage for 10s, the particles quickly gathered at both ends of the electrodes, and basically completed the ultra-low voltage induced self-assembly to form a chain structure between the two electrodes. A comb-like structure is formed on the bipolar plates, and a tightly wound columnar structure is formed in the middle.

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Abstract

The invention discloses a coated core-shell structure composite particle and its preparation method and application. The coated core-shell structure composite particle includes a core structure and a shell layer 1 and a shell layer 2 coated on the core structure in sequence. And shell three, the core structure is titanium dioxide, the shell one is aluminum oxide, the shell two is poly(styrene-divinylbenzene), and the shell three is polymethyl methacrylate . The invention prepares a composite particle with a coated core-shell structure through multi-step emulsion polymerization, which can realize particle self-assembly induced by ultra-low voltage. Through the coating modification of inorganic and organic materials, the prepared composite particles have excellent electrical response type, and have good application prospects in the field of optoelectronics.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a coated core-shell structure composite particle and its preparation method and application. Background technique [0002] Nanoparticles are particles whose size is on the order of nanometers (10 -9 m) Ultrafine particles are larger than atomic clusters, but smaller than common particles, and the particle size is generally between 1 and 100nm. Nanoparticles have basic characteristics such as small size effect, quantum size effect, surface effect, and macroscopic quantum tunneling effect, so they have unique properties in the fields of light, electricity, magnetism, heat, and catalysis. [0003] Inorganic materials have the advantages of good strength, rigidity, heat resistance, dimensional stability and long service life, but at the same time have disadvantages such as difficult processing and molding. Compared with inorganic materials, organic materials are easier to process...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F257/02C08F220/14C08F212/08C08F212/36C08F2/44C08K9/02C08K3/22B01J13/18B01J13/14B01J13/04H01L51/42H01L51/46B82Y30/00
CPCB01J13/043B01J13/14B01J13/18B82Y30/00C08F212/08C08F257/02C08K3/22C08K9/02C08K2003/2241C08K2201/011H10K30/35H10K2102/00C08F220/14C08F212/36C08F2/44Y02E10/549
Inventor 水玲玲龚颖欣金名亮周国富
Owner SOUTH CHINA NORMAL UNIVERSITY
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