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Synthesis and Characterization of Amphiphilic Gold Nanoparticles
Published on: July 2, 2019
Characterization, purification, and stability of gold nanoparticles
Suresh K Balasubramanian1, Liming Yang, Lin-Yue L Yung
1Division of Environmental Science and Engineering, National University of Singapore, 119260 Singapore.
Biomaterials
|August 31, 2010
Summary
Researchers identified and removed impurities from gold nanoparticle (AuNP) solutions, optimizing a purification method. Purified AuNPs remained stable and unoxidized, establishing them as reliable reference materials.
Area of Science:
- Nanotechnology
- Materials Science
- Analytical Chemistry
Background:
- Gold nanoparticles (AuNPs) are crucial in various applications.
- Synthesis methods can introduce impurities affecting AuNP properties.
- Characterization and purification are essential for reliable AuNP applications.
Purpose of the Study:
- To systematically identify impurities in synthesized gold nanoparticle solutions.
- To determine an optimal purification process for 20-nm gold nanoparticles.
- To evaluate the stability and oxidation state of purified gold nanoparticles.
Main Methods:
- Citrate reduction method for AuNP synthesis.
- Centrifugation (3000-11,000g, 10-60 min) for purification.
- Spectroscopic and analytical techniques for impurity identification and AuNP characterization.
Main Results:
- Acetate identified as a byproduct of citrate reduction.
- Optimal purification achieved at 7000g for 20 min, recovering ~80% of AuNPs.
- Purified AuNPs remained stable for 20 days at 4°C in the dark and were resistant to oxidation under aerosolization and heating.
Conclusions:
- A robust method for purifying gold nanoparticles was established.
- Purified 20-nm AuNPs exhibit excellent stability and resistance to oxidation.
- These purified AuNPs serve as valuable reference materials for nanomaterial safety assessments.
