Hygroscopic growth of simulated lung fluid aerosol particles under ambient environmental conditions
James F. Davies, Chelsea L. Price, Jack M. Choczynski, Ravleen Kaur Kohli
Abstract
The hygroscopicity of respiratory aerosol determines their particle size distribution and regulates solute concentrations to which entrained microorganisms are exposed. Here, we report the hygroscopicity of simulated lung fluid (SLF) particles. While the response of aqueous particles follow simple mixing rules based on composition, we observe phase hysteresis with increasing and decreasing relative humidity (RH) and clear uptake of water prior to deliquescence. These results indicate that RH history may control the state of respiratory aerosol in the environment and influence the viability of microorganisms.
Topics & Concepts
AerosolEfflorescenceHysteresisParticle (ecology)Chemical engineeringMaterials sciencePhase (matter)Phase transitionChemistryChemical physicsMineralogyThermodynamicsOrganic chemistryCondensed matter physicsPhysicsOceanographyEngineeringGeologynanoparticles nucleation surface interactionsParticle Dynamics in Fluid FlowsInhalation and Respiratory Drug Delivery