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Synthesis and Antibacterial Activities of 2D and 3D Silver Nanoparticles with Hyperbranched Polymer in Aqueous Solution

Author: ZhouYun
Tutor: SuZhongXing
School: Lanzhou University
Course: Physical and chemical
Keywords: octahedron hexagon plate-like silver nanoparticle antibacterial activities aqueous solution
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 82
Quote: 1
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Abstract


Hyperbranched polymers are widely used in many fields such as coatings, additives, medicine, supramolecular chemistry, optics and optoelectronics. In this paper, we synthesize different end-group of the hyperbranched polymers and study its molecular weight distribution, thermal analysis, inhibitory effect on the growth of E. coli and Staphylococcus aureus bacteriostasis, etc. The results show that the amino-containing hyperbranched polyurethane and containing -CSS- groups in the amino-terminated hyperbranched polymer have some antibacterial properties; -CSS-containing group of the hyperbranched polymer has better antibacterial activity.In the field of Materials Chemistry, silver nano-materials are widely used in photography, catalysis, photonics, optoelectronics, information storage, magnetic fluid, surface-enhanced Raman scatteringand inhibit bacterial growth, so silver nano-materials synthesis and morphology control has been a hot topic.This paper describes the current controlling of the morphology of silver nanoparticles and provides a new method of preparing two morphology-different Ag nanoparticles with hyperbranched polymer （HBP） in an environmentally-benefit way at room temperature. 3D （Octahedron） and 2D （hexagon plate-like） silver nanoparticles were first obtained with NH2-ended HBP （NH2-HBP） and OH-ended HBP （OH-HBP） respectively at room temperature in aqueous solution. We characterizates silver nanoparticles morphology by using transmission electron microscopy and scanning electron microscopy, analysizes the composite crystal structure of nano-materials by using selected area electron diffraction, test the zeta potential and electrophoretic mobility of nano-materials with the laser dynamic scanners, detectes the optical properties of the composite nano-materials with UV - visible spectrophotometer analysis, dicusses the role of different functional groups in forming different morphology of silver nanoparticles, the results show that the method described in this article, the shape-controlled factor is the reduction capability of the corresponding substituent. We changed the ratio of reactants to synthesis different shapes nanoparticles, but most are to be geometric with different morphology of the silver nanoparticles.We used inhibition curves and filter paper goods to study the law of antimicrobial performance for octahedron silver nanoparticles and hexagon silver nano-plate and their hyperbranched polymer composite. Experimental results show that: the two-dimensional and three-dimensional silver nanoparticles and their composite material have a good inhibitory effect on the growth of E. coli and Staphylococcus aureus.

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