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Optimum scavenger concentrations for sonochemical nanoparticle synthesis.
Henrik E Hansen1,2, Frode Seland3, Svein Sunde3
1Electrochemistry Group, Department of Materials Science and Engineering, Faculty of Natural Sciences, Norwegian University of Science and Technology (NTNU), 7491, Trondheim, Norway. henrik.e.hansen@ntnu.no.
Scientific Reports
|April 15, 2023
Summary
Optimizing nanoparticle synthesis using sonochemistry requires understanding radical scavengers. This study found optimal scavenger concentrations for maximizing silver nanoparticle formation, crucial for scalable production.
Area of Science:
- Materials Science
- Chemical Engineering
- Physical Chemistry
Background:
- Scaling up nanoparticle synthesis is challenging due to complex precursor and reducing agent interactions.
- Sonochemical synthesis offers an alternative by generating reducing agents in-situ via ultrasonic cavitation, eliminating the need for external additives.
- Radical scavengers play a critical role in controlling reaction kinetics and product properties during sonochemical synthesis.
Purpose of the Study:
- To investigate the impact of radical scavengers on the rate of silver nanoparticle (Ag-nanoparticle) formation during sonochemical synthesis.
- To determine the optimal concentrations of various radical scavengers for maximizing Ag-nanoparticle formation rates.
- To elucidate the influence of scavenger hydrophobicity and pyrolytic decomposition products on the sonochemical reduction process.
Main Methods:
- Utilized sonochemical synthesis for Ag-nanoparticle production.
- Employed titanyl dosimetry to quantify radical generation and reaction rates.
- Measured Ag-nanoparticle formation rates at varying concentrations of different radical scavengers.
- Investigated the effect of pyrolytic decomposition products on the synthesis.
Main Results:
- Identified specific, optimal concentrations for radical scavengers that maximize the Ag-nanoparticle formation rate.
- Established an inverse correlation between scavenger hydrophobicity and optimal concentration: 1-butanol < 2-propanol < ethanol < methanol < ethylene glycol.
- Observed a significant shift (order of magnitude) in optimal scavenger concentrations when pyrolytic decomposition products contribute to the reduction process.
- Demonstrated a considerable enhancement in the overall reduction rate under specific conditions.
Conclusions:
- Optimal radical scavenger concentrations are critical for maximizing Ag-nanoparticle formation rates in sonochemical synthesis.
- Scavenger hydrophobicity influences the required optimal concentration, with more hydrophobic scavengers needing lower concentrations.
- Pyrolytic decomposition products significantly alter optimal scavenger concentrations and enhance reduction rates, indicating a complex interplay of reaction pathways.
