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States of Matter and Phase Changes00:59

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Relative Humidity-Dependent Phase Transitions in Submicron Respiratory Aerosols.

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Submicron respiratory aerosols undergo liquid-liquid phase separation, impacting virus viability and transmission. Understanding these environmental effects on aerosol properties is key to controlling respiratory disease spread.

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Area of Science:

  • Environmental Science
  • Aerosol Science
  • Virology

Background:

  • Respiratory viruses like influenza and SARS-CoV-2 pose significant public health risks.
  • Transmission occurs via respiratory droplets and aerosols, influenced by environmental factors like relative humidity (RH) and temperature.
  • Previous research linked RH-dependent phase transitions in supermicrometer particles to virus viability.

Purpose of the Study:

  • To investigate phase transitions in submicrometer model respiratory aerosols.
  • To understand the impact of environmental factors on submicrometer aerosol properties.
  • To demonstrate a fluorescence-based method for studying submicrometer respiratory particle behavior.

Main Methods:

  • Model respiratory aerosols (mucin/salt mixtures, growth medium, simulated lung fluid) were prepared.
  • A probe molecule, Nile red, was added to detect phase transitions.
  • Polarity-dependent fluorescence emission was measured after RH conditioning.

Main Results:

  • Liquid-liquid phase separation (LLPS) was observed in submicrometer mucin/NaCl and growth medium particles.
  • Phase transitions in submicrometer aerosols were confirmed using fluorescence measurements.
  • The study demonstrated the utility of in situ fluorescence for analyzing submicrometer particle properties.

Conclusions:

  • LLPS occurs in submicrometer respiratory aerosols, similar to larger particles.
  • Submicrometer aerosol LLPS can influence virus viability and aerosol transmission.
  • Fluorescence-based measurements are effective for studying submicrometer respiratory particle physicochemical properties.