English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

. Atmospheric aerosols can exist in amorphous semi-solid or glassy phasestates whose viscosity varies with atmospheric temperature and relativehumidity. The temperature and humidity dependence of viscosity hasbeen hypothesized to be predictable from the combination of a water–organicbinary mixing rule of the glass transition temperature, a glass-transition-temperature-scaled viscosity fragility parameterization, and a wateruptake parameterization. This work presents a closure study betweenpredicted and observed viscosity for sucrose and citric acid. Viscosityand glass transition temperature as a function of water content arecompiled from literature data and used to constrain the fragilityparameterization. New measurements characterizing viscosity of sub-100  nm particles using the dimer relaxation method are presented. Thesemeasurements extend the available data of temperature- and humidity-dependent viscosity to −28 ∘C . Predicted relationships agree wellwith observations at room temperature and with measured isoplethsof constant viscosity at ∼107 Pa s at temperatures warmerthan −28 ∘C . Discrepancies at colder temperaturesare observed for sucrose particles. Simulations with the kinetic multi-layermodel of gas–particle interactions suggest that the observed deviationsat colder temperature for sucrose can be attributed to kinetic limitationsassociated with water uptake at the timescales of the dimer relaxationexperiments. Using the available information, updated equilibriumphase-state diagrams ( - 80 ∘ C T 40 ∘ C , temperature, and 0 % RH 100 % , relative humidity) for sucroseand citric acid are constructed and associated equilibration timescalesare identified.

Toward closure between predicted and observed particle viscosity over a wide range of temperatures and relative humidity