Appropriate positioning of a UVC lamp in an aircraft lavatory to inactivate microorganisms on frequently touched surfaces

Building and Environment, Journal Year: 2025, Volume and Issue: unknown, P. 112727 - 112727

Published: Feb. 1, 2025

Language: Английский

Chamber design and intensity-modulated ultraviolet-C LEDs for advanced pulsed photonic disinfection

Biomedical Engineering / Biomedizinische Technik, Journal Year: 2025, Volume and Issue: unknown

Published: May 5, 2025

Abstract Objectives Contaminated apparatus and surgical tools pose serious health risks. For such purpose, disinfection chambers are employed. However, these systems rely on mercury-based UV lamps which comes with various drawbacks. These limitations have driven interest in Ultraviolet-C Light Emitting Diode (UV-C LED) technology as a safer more efficient alternative. existing studies not thoroughly explored the impact of varying intensities pulse width modulation (PWM) efficacy. Methods To addess this, present study designed tested LED-based chamber by employing 4-W 275 nm Surface Mount Device (SMD) LEDs against frequently isolated bacteria. By following prior approach, irradiation time was alternated at 30-s intervals antibacterial efficacy assessed through parameters. Additionally, scanning electron microscopy (SEM) performed to examine morphological changes. Results indicated that reduction significantly influenced (p<0.05) PWM levels (60–100 %), achieving 2.05-log 10 1.54-log inactivation Escherichia coli Staphylococcus aureus, respectively, upon exposure 51.24 mJ/cm 2 under maximum settings. Moreover, complete cellular damage leading bleb protrusion cell-leakage confirmed disruption bacterial DNA. Conclusions In conclusion, UV-LEDs show great potential for disinfection, efficiency dosage.

Language: Английский

Study of UV-C LED Technology on In-door Air Disinfection: An Effective Mercury-free and Ozone-free Method to Irradicate Airborne Microorganisms

Published: Aug. 13, 2024

Language: Английский