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Polysaccharide-based silver nano-particle preparing method

A technology of silver nanoparticles and polysaccharides is applied in the field of preparation of silver nanoparticles to achieve the effects of good water solubility, biocompatibility, good dispersion stability and simple operation steps.

Active Publication Date: 2014-01-01
东台海滨科技创业园管理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the deficiencies of the existing methods for preparing silver nanoparticles, and provide a method for preparing polysaccharide-based silver nanoparticles. Environmental pollutants, and can achieve continuous large-scale production, green preparation method with controllable particle size

Method used

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Examples

Experimental program
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Embodiment 1

[0020] The prepared oxidized curdlan polysaccharide solution with a mass concentration of 0.5 mg / mL and a carboxyl content of 2.07 mmol / g was added to a water-soluble silver nitrate solution with a molar concentration of 1 mmol / L to form a mixed solution; Under the conditions, react at a constant temperature of 100°C for 2 h, cool to room temperature, filter, centrifuge, disperse, dialyze and freeze-dry to obtain polysaccharide-based silver nanoparticles.

Embodiment 2

[0022] Add the prepared oxidized curdlan polysaccharide solution with a mass concentration of 2.0 mg / mL and a carboxyl content of 4.87 mmol / g to a water-soluble silver nitrate solution with a molar concentration of 100 mmol / L to form a mixed solution; Under the conditions, react at a constant temperature of 100°C for 2 h, cool to room temperature, filter, centrifuge, disperse, dialyze and freeze-dry to obtain polysaccharide-based silver nanoparticles.

Embodiment 3

[0024] This example is basically the same as Example 1, except that the mass concentration of oxidized cotran polysaccharide is 1.0 mg / mL, the carboxyl content is 4.87 mmol / g, and the molar concentration of the water-soluble silver nitrate solution is 10 mmol / L.

[0025] Disperse the silver nanoparticles prepared above in distilled water to obtain a silver nanoparticle solution with a concentration of 0.5 mg / mL, and observe its TEM image, as shown in figure 1 As shown, the morphology of silver nanoparticles is spherical, the particle size is uniform, and the average particle size is 15 nm. Stored at room temperature for half a year without agglomeration.

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Abstract

The invention discloses a polysaccharide-based silver nano-particle preparing method and relates to the technical field of preparation of silver nano-particles. Prepared oxidized curdlan with the carboxyl group content 2.07-4.87mmol / g and a silver nitrate solution are mixed in an isopyknic mode to form a mixed solution, the mixed solution reacts under the magnetic stirring at the constant temperature of 70-100 DEG C for 0.5-2h and then is cooled to be at the room temperature, filtered, centrifuged, dispersed, dialyzed and freeze-dried to prepare polysaccharide-based silver nano-particles, and spherical silver nano-particles controllable in particle diameter can be obtained by controlling the concentration of the oxidized curdlan, the carboxyl group content and the silver nitrate concentration. Therefore, the polysaccharide-based silver nano-particle preparing method is environment-friendly, simple and easy to operate and enables the silver nano-particles to be controllable in particle diameter, evenly dispersed and good in stability, and continuous large-scale production can be achieved.

Description

technical field [0001] The invention relates to the technical field of preparation of silver nanoparticles, in particular to a method for preparing spherical silver nanoparticles by oxidizing curdlan polysaccharide as a reducing agent and a stabilizer. Background technique [0002] Metal nanomaterials have many properties that ordinary materials do not have, and have been widely used in chemistry, physics, electronics, optical materials and other fields. Among them, silver nanoparticles have great application value in the fields of electronics, catalysis, and optics due to their excellent thermal conductivity, surface activity, surface energy, and catalytic performance. Their preparation has always been a research subject in materials, chemistry, and physics. One of the hot spots. [0003] There are many literature reports on the preparation method of silver nanoparticles. Usually, sodium borohydride is used as a reducing agent, and surfactants and polymers are used as sta...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 闫景坤马海乐蔡攀福曹小强
Owner 东台海滨科技创业园管理有限公司
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