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Preparation method of hollow metal microspheres

A metal microsphere and hollow technology, applied in the field of composite materials, can solve the problems of complex process, influence product quality, complex processing process, etc., and achieve the effects of short reaction time, easy control of process conditions, and simple processing process.

Inactive Publication Date: 2013-06-26
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Guo et al. (Guo, S.J.; Fang, Y.X.; Dong, S.J.; Wang, E. High-Efficiency and Low-Cost Hybrid Nanomaterial as Enhancing Electrocatalyst: Spongelike Au / Pt Core / Shell Nanomaterial with Hollow Cavity. J. Phys. Chem .C.2007,111,17104.) Using Co as a template to prepare PtAu alloy hollow microspheres by means of electric displacement reaction, but the preparation of Co template needs to be in an inert atmosphere, and the process is complicated
Kim, et al. (Kim, Y.M.; Kim, H.J.; Kim, Y.S.; Choi, S.M.; Seo, M.H.; Kim, W.B. Shape-and composition-sensitive activity of Pt and PtAu catalysts for formic acid electrooxidation. J. Phys. Chem. C.2012, 116, 18093.) A PtAu bimetallic hollow structure catalyst with controllable morphology was prepared by using Ag as a template, but AgCl precipitation will be generated during the reaction process, which makes the subsequent treatment process complicated and will affect the quality of the product. quality

Method used

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  • Preparation method of hollow metal microspheres
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  • Preparation method of hollow metal microspheres

Examples

Experimental program
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Embodiment 1

[0027] (1) Take 1 mL of chloroauric acid solution with a mass concentration of 13.6 g / L and dilute it to 150 mL, and adjust the pH between 6 and 7 with sodium hydroxide (40 g / L) solution. After heating the solution to boiling, add 1.4 mL of sodium citrate (25.8 g / L) solution, and stir magnetically until the color of the solution turns ruby ​​red to obtain gold nanoparticles.

[0028] (2) 125mg tetra-n-butyl titanate (Ti(OC 4 h 9 ) 4 ) into 10 mL of ethylene glycol, stirred magnetically at room temperature for 8 hours, then quickly added 50 mL of acetone (containing 150 μL of ultrapure water), stirred magnetically at room temperature for 1 hour, centrifuged, washed, and dried to obtain titanium dioxide.

[0029] (3) Take 10 mg of titanium dioxide and 250 μL of silane coupling agent (APTMS) and mix and stir at room temperature for 12 hours, centrifuge, wash, and dry to obtain surface-functionalized titanium dioxide.

[0030] (4) Take 120mL of gold nanoparticles and surface-fu...

Embodiment 2

[0033] The difference between this example and Example 1 is that the silane coupling agent used is 1000 μL, and the rest is the same as Example 1. The Au / TiO of embodiment 2 gained 2 The SEM pictures of the samples are shown in figure 2 .

Embodiment 3

[0035] The preceding steps are the same as in Example 1. Take 1mL Au / TiO 2 Set the volume to 30mL, heat the solution to 100°C, add 3mL of citric acid (19.2g / L), 0.3mL of chloroplatinic acid (13.8g / L) and 1.0mL of vitamin C (17.6g / L), and then continue React for 0.5 h, centrifuge and wash several times to obtain PtAu hollow microspheres. The SEM pictures of the PtAu hollow microspheres obtained in embodiment 3 are shown in image 3 .

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Abstract

A preparation method of hollow metal microspheres relates to a composite material. The invention provides a preparation method of hollow metal microspheres which is quick, environment-friendly and simple in subsequent treatment process. The preparation method comprises the steps of preparing gold nanoparticles and titanium dioxide successively, and then functionalizing the surface of titanium dioxide, and then preparing Au / TiO2, and finally preparing the hollow metal microspheres. Titanium dioxide microspheres are used as templates, and dimension-controllable PtM metal hollow microspheres are prepared by means of the pH sensitivity of the titanium dioxide. The size of the PtM metal hollow microspheres can be controlled by regulating the size of the template titanium dioxide, and simultaneously, the thickness of the PtM metal hollow microspheres can be changed by changing the concentration of the metal precursor. Multi-layer PtM hollow microspheres are synthesized with the titanium dioxide as the templates; and therefore, the preparation method of the hollow microspheres is expanded. Besides, the technical conditions are mild and easy to control, the reaction time is short, the templates are easy to remove without use of a high temperature or a strong acid and a strong base, and the like, and simultaneously, the subsequent treatment process is simple.

Description

technical field [0001] The invention relates to a composite material, in particular to a method for preparing hollow metal microspheres. Background technique [0002] Nanomaterials with hollow structures have many different applications due to their low density, easy recycling, cost saving, and excellent surface permeability, such as catalysis, drug delivery, artificial materials, lightweight fillers, insulating materials, low dielectric materials , photonic crystals, etc., especially in terms of catalysis, nanomaterials with hollow structures show better catalytic performance than ordinary solid-structure nanomaterials. At present, metal hollow microspheres with Pt as the main component have attracted extensive attention due to their excellent catalytic performance for methanol oxidation. [0003] The template method is a common method for preparing PtM (M stands for metal) hollow microspheres. Currently commonly used templates are silicon dioxide (SiO2), polystyrene (PS)...

Claims

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Application Information

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IPC IPC(8): B22F9/24B01J13/02B01J37/02B01J35/08
Inventor 朱爱梅黄荣张秋根刘庆林
Owner XIAMEN UNIV
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