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Preparation method of polydopamine/polyacrylic acid supported nano-silver composite material

A technology of polydopamine and polyacrylic acid, which is applied in the field of preparation of silver nanocomposite materials, can solve the problems of uneven size and poor dispersion of nano silver particles, and achieve the effect of good control.

Active Publication Date: 2017-04-26
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the problem of poor dispersibility and non-uniform size of nano-silver particles directly prepared by using polydopamine as a reducing agent in the prior art, and to provide a polyacrylic acid with a three-dimensional network structure to control polydopamine. Dopamine reduction rate, method for preparing polydopamine / polyacrylic acid loaded nano-silver composite material with good nano-silver dispersion, uniform size and pH sensitivity

Method used

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  • Preparation method of polydopamine/polyacrylic acid supported nano-silver composite material
  • Preparation method of polydopamine/polyacrylic acid supported nano-silver composite material
  • Preparation method of polydopamine/polyacrylic acid supported nano-silver composite material

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Embodiment 1

[0036] 1. Preparation of polydopamine / polyacrylic acid core-shell composite microspheres

[0037]In a clean 50mL beaker, add 22.5mL double distilled water and 10mL absolute ethanol, then add 0.3mL concentrated ammonia water (mass fraction is 26% ~ 28%), after magnetic stirring (500 rpm) of the resulting mixture for 30 minutes, Slowly add 2 mL of dopamine aqueous solution with a mass-volume concentration of 50 mg / mL, react at room temperature for 30 hours, and centrifuge the resulting solution with twice-distilled water at 9500 rpm for 10 times, each time for 30 minutes, until the supernatant is colorless Finally, the lower precipitate was vacuum-dried at 80° C. to obtain polydopamine (PDA) microspheres. Depend on figure 1 It can be seen that the average particle diameter of the obtained PDA microspheres is 200nm; the hydration kinetic diameter (D h ) is about 236nm (see figure 2 ), narrow particle size distribution and good monodispersity.

[0038] Add 0.03g of polydopami...

Embodiment 2

[0043] In the step 2 of embodiment 1, the silver ammonia solution that initial concentration is 0.075mol / L is replaced with the silver ammonia solution that equal volume initial concentration is 0.005mol / L, other steps are identical with embodiment 1, obtain PDA / PAA- Ag composites. Depend on Figure 11 with 12 It can be seen that the loaded silver nanoparticles are more evenly dispersed and more uniform in size, and the particle size of the nano-silver is about 10-15 nm.

Embodiment 3

[0045] In the step 2 of embodiment 1, the silver ammonia solution that initial concentration is 0.075mol / L is replaced with the silver ammonia solution that equal volume initial concentration is 0.05mol / L, other steps are identical with embodiment 1, obtain PDA / PAA- Ag composites. Depend on Figure 13 with 14 It can be seen that the loaded silver nanoparticles are evenly dispersed and uniform in size, and the particle size of nano silver is about 20-25nm.

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Abstract

The invention discloses a preparation method of a polydopamine / polyacrylic acid supported nano-silver composite material. The method comprises the steps that a polydopamine microsphere is used a core, a seed emulsion polymerization method is adopted for synthesizing a polydopamine / polyacrylic acid composite microsphere, a silver-ammonia solution is reduced in situ through the reducibility of polydopamine, and therefore the polydopamine / polyacrylic acid supported nano-silver composite material is prepared. According to the preparation method, operation is easy, reaction conditions are mild, a large number of carboxy groups in polyacrylic acid of a shell three-dimensional network structure have a strong bonding effect on silver nanoparticles and a confined effect on a macromolecule network chain, the silver nanoparticles can be stabilized, the particle diameter of the nanoparticles can be controlled, the silver nanoparticles in the prepared composite material are good in dispersity and uniform in size, and meanwhile the obtained composite materials also has pH sensitivity.

Description

technical field [0001] The invention belongs to the technical field of preparation of silver nano composite materials, and in particular relates to a preparation method of polydopamine / polyacrylic acid loaded nano silver composite materials. Background technique [0002] Polydopamine (PDA) is widely used in the fields of biology, medicine and chemistry because of its good hydrophilicity, adhesion, stability and biocompatibility. The structure of polydopamine is rich in phenolic hydroxyl groups and nitrogen-containing groups, which has a strong adsorption effect on metal ions (such as: gold, silver, palladium, etc.), and plays a stabilizing role in the synthesis of metal nanoparticles. At the same time, a large number of active groups (amino groups, phenolic hydroxyl groups) contained on the surface of polydopamine also have a reducing effect, which can reduce metal ions in situ, for example: Hongbo Zeng et al. (ACS Appl.Mater.Interfaces, 2014, 6( 11), 8845-8852) firstly ads...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/00C08F220/06C08F222/38C08K3/08
Inventor 张颖李沙沙李梦杰
Owner SHAANXI NORMAL UNIV
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