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Updated: May 27, 2025
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Millifluidics for Chemical Synthesis and Time-resolved Mechanistic Studies
Published on: November 27, 2013
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Kinetic analysis of silver nanowire synthesis: polyol batch and continuous millifluidic methods
Destiny F Williams1, James E Smay2, Shohreh Hemmati3
1Oklahoma State University, School of Chemical Engineering, 420 Engineering North Stillwater, OK 74078, USA.
Nanoscale
|February 20, 2025
Summary
Millifluidic flow reactors (MFRs) significantly enhance silver nanowire (AgNW) synthesis compared to batch methods. MFRs accelerate nucleation and growth rates, leading to higher yields and faster production of AgNWs.
Area of Science:
- Materials Science
- Chemical Engineering
- Nanotechnology
Background:
- The polyol method is a common technique for synthesizing silver nanowires (AgNWs).
- Optimizing synthesis conditions is crucial for controlling AgNW properties and production efficiency.
- Batch reactors present limitations in controlling reaction parameters and scalability.
Purpose of the Study:
- To compare the nucleation and growth kinetics of AgNWs synthesized via the polyol method in batch and millifluidic flow reactors (MFRs).
- To quantify the impact of MFRs on AgNW concentration, yield, and diameter.
- To elucidate the role of MFR design in enhancing AgNW synthesis.
Main Methods:
- Synthesis of AgNWs using the polyol method in both batch and MFR setups.
- Quantification of silver ion concentration using the El-Ghamry method.
- Application of the Finke-Watzky model to determine nucleation (k1) and growth (k2) rate constants.
- Characterization of AgNWs using ultraviolet-visible (UV-vis) spectroscopy.
Main Results:
- Nucleation (k1) and growth (k2) rate constants were approximately 4x and 2x higher in MFRs compared to batch reactors.
- AgNW concentration and yield were approximately 10x higher when synthesized in MFRs.
- Overall AgNW synthesis in MFRs was found to be approximately 3x faster than in batch reactors.
- MFRs exhibited improved reagent mixing and minimized temperature transients due to coiled configuration and Dean vortices.
Conclusions:
- MFRs offer a significant advantage over batch reactors for AgNW synthesis, enabling faster production and higher yields.
- The enhanced performance of MFRs is attributed to improved mixing, controlled temperature, and optimized reaction kinetics.
- This study demonstrates the potential of MFRs for continuous and efficient AgNW production.
