Parametric Study of Gold Nanoparticles Synthesis under Micro-Continuous Flow Conditions

Area of Science:

• Nanotechnology
• Materials Science
• Chemical Engineering

Background:

• Chemical reduction is a common method for synthesizing gold nanoparticles (GNPs).
• Batch synthesis methods offer flexibility but can lack precise control over nanoparticle size and uniformity.
• Microreactor technology presents an alternative for controlled nanoparticle synthesis.

Purpose of the Study:

• To compare the synthesis of gold nanoparticles using batch and microreactor methods.
• To investigate the effect of various synthesis parameters on gold nanoparticle size.
• To optimize gold nanoparticle synthesis for smaller sizes and faster reaction times.

Main Methods:

• Parametric study of batch synthesis using the modified Martin method.
• Optimization of polyvinyl alcohol (capping agent) and sodium borohydride (reducing agent) concentrations.
• Synthesis of gold nanoparticles in a glass chip microreactor under optimized conditions.
• Characterization using Atomic Absorbance spectroscopy (AAS), UV-Vis spectroscopy, and dynamic light scattering (DLS).

Main Results:

• Optimum conditions were determined for gold nanoparticle synthesis.
• Microreactor synthesis yielded smaller gold nanoparticles (10.42-11.31 nm) compared to batch methods.
• Microreactor synthesis achieved these results in less than 1 minute reaction time.

Conclusions:

• Microreactor synthesis offers superior control over gold nanoparticle size and reaction kinetics.
• The optimized microreactor method is efficient for producing small, uniform gold nanoparticles.
• This approach has potential applications in fields requiring precisely synthesized nanomaterials.