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Related Experiment Video

Updated: May 9, 2026

Synthesis of Multi-walled Carbon Nanotubes Modified with Silver Nanoparticles and Evaluation of Their Antibacterial Activities and Cytotoxic Properties

Synthesis of Multi-walled Carbon Nanotubes Modified with Silver Nanoparticles and Evaluation of Their Antibacterial Activities and Cytotoxic Properties

Published on: May 10, 2018

Microbial synthesis of silver nanoparticles.

Yumi Kim¹, Byeong-Gweon Lee, Yul Roh

¹Department of Earth and Environmental Sciences, Chonnam National University, Gwangju 500-757, Korea.

Journal of Nanoscience and Nanotechnology

|July 19, 2013

Summary

Metal-reducing bacteria efficiently synthesize silver nanoparticles (Ag(0) nanoparticles) using silver nitrate. Optimal conditions for this biogenic synthesis involve specific temperatures and pH levels, offering a method for nanoparticle production and silver recovery.

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Published on: October 4, 2012

Area of Science:

Biotechnology
Nanotechnology
Microbiology

Background:

Silver nanoparticles (Ag(0) nanoparticles) exhibit unique properties.
Biogenic synthesis offers a sustainable alternative to chemical nanoparticle production.
Controlling biosynthesis conditions is crucial for obtaining homogeneous nanoparticles.

Purpose of the Study:

To investigate the biogenic synthesis of silver nanoparticles (Ag(0) nanoparticles).
To determine the optimal experimental conditions for Ag(0) nanoparticle biosynthesis.
To explore the enzymatic reduction of silver ions by metal-reducing bacteria.

Main Methods:

Incubation of metal-reducing bacteria with silver nitrate.
Adjustment of experimental parameters: silver nitrate concentration, pH, and temperature.
Characterization of synthesized nanoparticles (size: 5-15 nm).

Main Results:

Metal-reducing bacteria successfully synthesized Ag(0) nanoparticles.
Optimal synthesis occurred at 15-25°C, pH 7.5-8.5, with 0.5-1 mM silver nitrate.
Nanoparticles were formed within 3 days of incubation.

Conclusions:

Bacteria enzymatically reduce silver ions (Ag(I)) to form Ag(0) nanoparticles.
The study provides a method for microbial synthesis of homogeneous silver nanoparticles.
This research offers potential for silver recovery from natural environments.