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Synthesis of Colloidal Silver Nanoparticles by Microwave Method and Study of its Antibacterial Activity

Abtahi, Nikoo | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 42962 (57)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Dolati, Abolghasem
  7. Abstract:
  8. Silver nanoparticles are widely used in different industries because of their antibacterial effects. Many synthesis methods were used to obtain silver nanoparticles. In this study the microwave method is used to synthesize nanosilver. This method is easier and faster in comparison to other methods. The effect of precursors’ concentrations, using different solvents, different remaining time in microwave and microwave power were studied. By increasing the reaction time, microwave power and using different solvents, nanosilver particle size varies from 2 nm up to 300nm. The TEM images, size distribution, XRD patterns and UV-visible spectrum are shown. The obtained nanosilver was used to observe its power of bacteria killing. SRB and Thiobacillus were used to examine the antibacterial effect of synthesized nanosilver. Optimum results were obtained when PEG was used as a solvent. Optimum concentration of silver nanoparticles for killing SRB in the case of the solution in which PEG was used as a solvent was about 13 ppm and after 12 minutes all bacteria were killed. Thiobacillus was more resistant in contact with silver nanoparticles and in the case of this bacterium after about 15 min all bacteria were killed while this solution was used as an antibacterial agent
  9. Keywords:
  10. Silver Nanoparticles ; Microwave ; Antibacterial Activity

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