Prepn of nano cadmium sulfide/polystyrene core-shell microsphere

A polystyrene microsphere and polystyrene technology, which is applied in the fields of chemistry and inorganic materials, can solve problems such as complex reactions, and achieve the effects of simple operation, short production cycle and high efficiency

Inactive Publication Date: 2004-04-07
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods have complex reactions and re

Method used

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  • Prepn of nano cadmium sulfide/polystyrene core-shell microsphere
  • Prepn of nano cadmium sulfide/polystyrene core-shell microsphere
  • Prepn of nano cadmium sulfide/polystyrene core-shell microsphere

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Embodiment 1

[0016] (1) Styrene, sodium lauryl sulfate, potassium persulfate and deionized water distilled under reduced pressure are mixed in a three-necked flask in a mass ratio of 100:0.3:1:574, nitrogen gas is passed for 20 minutes and the temperature is raised rapidly After stirring for 6 hours at 80° C., the emulsion was broken with sodium chloride solution, filtered and washed, and the product was dried in a vacuum oven at room temperature for 24 hours to obtain polystyrene microspheres with a diameter of 250 nanometers.

[0017] (2) Mix 50 mg of polystyrene microspheres, 436.3 mg of cadmium acetate, 123 mg of thioacetamide and 50 g of ammonia water in a 50 mL Erlenmeyer flask, sonicate for 5 minutes, then place in an oil bath and heat at 60°C. Stir for 4 hours. After the reaction is completed, it is washed with ethanol or water, centrifuged, and dried in an oven to obtain a powder which is the cadmium sulfide / polystyrene core-shell nanometer microsphere.

Embodiment 2

[0019] (1) Styrene, sodium lauryl sulfate, potassium persulfate and deionized water distilled under reduced pressure are mixed in a three-necked flask in a mass ratio of 100:0.1:1:574, nitrogen gas is passed for 20 minutes and the temperature is raised rapidly After stirring for 6 hours at 80°C, the emulsion was broken with sodium chloride solution, filtered and washed. The product was dried in a vacuum oven at room temperature for 24 hours, and the obtained powder was polystyrene microspheres with a diameter of about 375 nanometers.

[0020] (2) Mix 60 mg of polystyrene microspheres, 373.8 mg of cadmium chloride, 124.6 mg of thiourea and 50 g of water in a 50 mL Erlenmeyer flask, ultrasonicate for 5 minutes, then place in an oil bath to heat and stir at 80°C for 2 Hour. After the reaction is completed, it is washed with ethanol or water, centrifuged, and dried in an oven to obtain a powder which is the cadmium sulfide / polystyrene core-shell nanometer microsphere.

Embodiment 3

[0022] (1) Styrene, sodium lauryl sulfate, potassium persulfate and deionized water distilled under reduced pressure are mixed in a three-necked flask in a mass ratio of 100:0.5:1:574, nitrogen gas is passed for 20 minutes and the temperature is raised rapidly After stirring for 6 hours at 80°C, the emulsion was broken with sodium chloride solution, filtered and washed. The product was dried in a vacuum oven at room temperature for 24 hours, and the obtained powder was polystyrene microspheres with a diameter of about 130 nanometers.

[0023] (2) Mix 40 mg of polystyrene microspheres, 341.2 mg of cadmium sulfate, 111.3 mg of ammonium sulfide and 50 g of ethanol in a 50 mL Erlenmeyer flask, sonicate for 5 minutes, then heat and stir in an oil bath at 60°C for 4 hours. After the reaction is completed, it is washed with ethanol or water, centrifuged, and dried in an oven to obtain a powder which is the cadmium sulfide / polystyrene core-shell nanometer microsphere.

[0024] The X-r...

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Abstract

During the preparation of nano cadmium sulfide/polystyrene core-shell microsphere, polystyrene microsphere is first prepared through emulsion polymerization, which includes mixing decompress distilled styrene, lauryl sodium sufate, potassium persulfate and twice deionized water in certain proportion, leading in nitrogen while fast raising the temperature to 80 deg.c for reaction, demulsification with sodium chloride solution, filtering, washing and drying; the polystyrene microsphere is then mixed with sulfur source and cadmium source in some solvent and the mixture is heated to prepare the nano cadmium sulfide/polystyrene core-shell microsphere. The cadmium source is cadmium chloride with crystal water, cadmium caetate with crystal water, cadmium sulfate or cadmium nitrate; the sulfur source is thiacetamide, sulfourea, carbon disulfide or ammonium sulfide; and the solvent is ethanol, water or ammonia water. The microsphere is homogeneous in size and has compact shell.

Description

Technical field: [0001] The invention relates to a preparation method of nano-cadmium sulfide / polystyrene core-shell microspheres, in particular to the preparation of nano-cadmium sulfide / polystyrene core-shell microspheres by a chemical solution method. It belongs to the technical field of chemistry and inorganic materials. Background technique: [0002] In materials science, if you want to apply the special properties of nanoparticles in the form of materials, it must be composited and assembled with bulk materials in some form, so unique and selective core-shell materials can be prepared to achieve different applications. become a research hotspot. Nano-cadmium sulfide (CdS) particles have great potential in optical, magnetic, and catalytic applications (light-emitting diodes, solar cells, sensors, and photocatalysis). At the same time, it also has second-order nonlinear optical properties (nonlinear optical phenomena are the core issues of transmitting, processing and ...

Claims

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Application Information

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IPC IPC(8): C08J3/00C08K3/30C08L25/06
Inventor 张言波钱雪峰朱子康
Owner SHANGHAI JIAO TONG UNIV
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