A preparation method of silica@noble metal nanocomposite microspheres

A silicon dioxide and nanocomposite technology, applied in the direction of microsphere preparation, microcapsule preparation, etc., can solve the problems of high consumption of organic solvents, non-compliance with environmental protection requirements, high requirements for reaction devices, etc., to achieve adjustable particle size, particle size Uniform and reproducible results

Active Publication Date: 2017-05-03
河北佩清科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to solve the existing problems such as harsh modification conditions, high requirements for reaction devices, long time consumption, high consumption of organic solvents, and non-compliance with environmental protection requirements.

Method used

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  • A preparation method of silica@noble metal nanocomposite microspheres
  • A preparation method of silica@noble metal nanocomposite microspheres
  • A preparation method of silica@noble metal nanocomposite microspheres

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Put 59.20mL triple-distilled water, 38.00mL absolute ethanol, and 2.80mL concentrated ammonia water into a 250mL three-necked flask in sequence, and stir magnetically at 1100rpm for 30min. After mixing evenly, quickly pour the uniform mixed solution of 9.00mLTEOS and 91.00mL absolute ethanol into the above-mentioned three-neck flask. After 2min, reduce the stirring speed to 400rpm, keep the reaction at 25°C for 6h, centrifuge at 10000rpm for 5min, and use anhydrous Washed several times with ethanol and triple distilled water to obtain monodisperse SiO 2 nanospheres, which are then dispersed in water, SiO 2 The mass fraction is 2mg / ml. Transmission electron microscope observation shows that the SiO obtained by the reaction 2 Nanoparticles are spherical, about 100 nm in diameter, and monodisperse, such as figure 1 shown.

[0025]Add 5mL 2mg / mL PAH aqueous solution (NaCl 0.5M pH 5~6) to 50mL SiO 2 In the dispersion, after ultrasonication at room temperature for 60 min...

Embodiment 2

[0027] Put 55.10 mL triple-distilled water, 36.50 mL absolute ethanol, and 8.40 mL concentrated ammonia water into a 250 mL three-necked flask in sequence, and stir magnetically at 1100 rpm for 30 min. After mixing evenly, quickly pour the uniform mixed solution of 9.00mLTEOS and 91.00mL absolute ethanol into the above-mentioned three-neck flask. After 2min, reduce the stirring speed to 400rpm, keep the reaction at 25°C for 6h, centrifuge at 10000rpm for 5min, and use anhydrous Washed several times with ethanol and triple distilled water to obtain monodisperse SiO 2 nanospheres, which are then dispersed in water, SiO 2 The mass fraction is 2mg / ml. Transmission electron microscope observation shows that the SiO obtained by the reaction 2 Nanoparticles are spherical, about 300 nm in diameter, and monodisperse, such as image 3 shown.

[0028] Add 5 mL of 2 mg / mL PAH aqueous solution (NaCl 0.5M pH 5-6) to 50 mL of SiO 2 In the dispersion, after ultrasonication at room temper...

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Abstract

The invention discloses a preparation method of silica @ noble metal nano-composite microspheres. The method comprises the following steps: 1) preparing silica nano microspheres; 2) dispersing the nano microspheres into tri-distilled water, and adding a sodium chloride water solution of polyelectrolyte to obtain polyelectrolyte-modified silica nano microspheres; 3) dispersing the nano microspheres into the tri-distilled water, and dropwise adding a noble metal salt water solution to obtain polyelectrolyte-modified silica nano microspheres stained with noble metal ions; 4) dispersing the silica nano microspheres into the tri-distilled water, and dropwise adding a sodium borohydride water solution to obtain the silica @ noble metal nano-composite microspheres. According to the preparation method, water is taken as a medium under the reaction condition at a room temperature of 25 DEG C; an organic solvent is not required; complicated and tedious modifying processes are not required; the silica @ noble metal nano-composite microspheres with high dispersity and good stability can be rapidly prepared; the method is simple and feasible, good in repeatability, and simple in reaction device; large-scale production can be achieved according to the production requirements.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and relates to a method for preparing silica@noble metal nanocomposite microspheres. Specifically, silica is used as the core, polyelectrolyte is used to modify silica, and noble metal nanoparticles are loaded on the surface and its preparation method. Background technique [0002] In addition to the small size effect, quantum tunneling effect, quantum size effect, and surface effect of nanoparticles, noble metal nanoparticles are widely used in chemistry, physics, electronics, optics, and materials science due to their unique physical, chemical, and biological properties. , biology, pharmacology and other disciplines have important research value, in industrial catalysis, detection chemistry, photonic crystals, surface enhanced fluorescence spectroscopy, surface enhanced Raman spectroscopy, antibacterial materials, infrared stealth materials, biomedicine, biological prepar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F9/24B01J13/02
Inventor 葛凤燕高洪国蔡再生
Owner 河北佩清科技有限公司
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