Designing an Antibacterial Radiative Cooling Device with the Engineering Optical Properties of Silver Nanoparticles.

Area of Science:

• Materials Science
• Nanotechnology
• Environmental Science

Background:

• Rising global temperatures and microbial contamination pose significant threats.
• Developing single-material solutions for cooling and antibacterial properties is crucial.

Purpose of the Study:

• To design and fabricate a multifunctional antibacterial radiative cooling device (ARCD).
• To evaluate the cooling performance and antibacterial efficacy of the developed ARCD.
• To explore the potential for photoluminescent radiative cooling and real-world applications.

Main Methods:

• Fabrication of a triple-layer structure using silver nanoparticles (Ag NPs), polydimethylsiloxane, and silver thin film.
• Ligand exchange of Ag NPs with 1,4-butanedithiol (BDT) for enhanced performance.
• Functionalization with InP quantum dots for photoluminescent properties.
• Testing cooling performance under outdoor conditions and evaluating antibacterial activity against E. coli and S. aureus.

Main Results:

• The optimized ARCD achieved a subambient cooling of up to 3.7 °C.
• Demonstrated >99.99% bacterial reduction for both E. coli and S. aureus.
• A luminescent antibacterial cooling tumbler showed a 6.8 °C water temperature reduction and sustained antimicrobial activity.

Conclusions:

• The developed ARCD effectively integrates radiative cooling and antibacterial functionalities.
• This technology shows promise for sustainable thermal management and hygiene in various applications.
• Multifunctional materials offer a pathway to next-generation solutions for built environments and consumer products.